87b0954f0c
Three things asked for, and a fourth found while doing them. The map looked like a photograph of a map, and did so twice over. The window fetched at its own pixel size but for a box a third larger in each direction -- the margin added to stop the ground blinking -- and then cut the middle out, so every pixel was enlarged by two thirds. It now asks for enough pixels to cover the bigger box at the window's own detail. Underneath that, both the window and the animation took the nearest source pixel: the tile mosaic is commonly half again the size of the picture, so most of every tile was thrown away and what survived was the aliasing. Both now average the source pixels that fall in each output cell, done as the difference of a running total rather than a loop. An aircraft that goes quiet now fades instead of vanishing. Taking it off between one frame and the next says it stopped existing; fading says it stopped talking, which is what happened. It fades where it was last actually seen and never along a reckoned track, because the reason for giving up on it is that where it would be by now is a guess. --fade sets how long, and it is in the menu. The window has alpha and fades smoothly; an indexed picture cannot blend, so the animation gained a fourth ramp at a seventh of full and fades in four steps, which at a second apart reads as a fade. A trail fades with the aircraft it belongs to, and the box goes before the symbol does. The aircraft's country of registration carries a flag now as well as the two ends of its route, from the register where one answered and from the address block otherwise. And the fourth: the window's header counted an aircraft that had gone quiet as overhead, which was saying more than had been heard. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_016PsWPTweCT6pwxKngvVxcg
1188 lines
47 KiB
Python
1188 lines
47 KiB
Python
"""The moving map: what is drawn, and whether the file is really a GIF.
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A picture is checked here the way a picture has to be -- by reading the pixels
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back -- and the file by taking it apart with a reader written from the GIF
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specification rather than from the encoder in the program. An encoder checked
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against itself is not checked.
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"""
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import struct
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import subprocess
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from pathlib import Path
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import numpy as np
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import pytest
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from bandsaunter import flightmap as fm
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from bandsaunter.flightlog import Fix, Track
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# ---------------------------------------------------------------------------
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# A GIF reader, built from the specification
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# ---------------------------------------------------------------------------
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def lzw_decode(data: bytes, code_bits: int) -> bytes:
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"""GIF's LZW, the reading side, written from the standard."""
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clear, end = 1 << code_bits, (1 << code_bits) + 1
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table = {i: bytes([i]) for i in range(clear)}
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width = code_bits + 1
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counter = end + 1 # counts codes read, not entries added
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out = bytearray()
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previous = None
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value = held = at = 0
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while True:
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while held < width and at < len(data):
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value |= data[at] << held
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held += 8
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at += 1
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if held < width:
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break
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code = value & ((1 << width) - 1)
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value >>= width
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held -= width
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if code == clear:
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table = {i: bytes([i]) for i in range(clear)}
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width, counter, previous = code_bits + 1, end + 1, None
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continue
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if code == end:
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break
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# The width goes up as codes are read rather than as the table is
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# filled: the decoder builds its table one code behind the encoder,
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# and counting entries instead would widen the codes one too late.
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read_at = counter
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if counter < 4096:
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counter += 1
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if counter > (1 << width) and width < 12:
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width += 1
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if code in table:
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entry = table[code]
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elif previous is not None:
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entry = previous + previous[:1]
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else:
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raise ValueError(f"code {code} before anything defined it")
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out += entry
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if previous is not None and read_at - 1 < 4096:
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table[read_at - 1] = previous + entry[:1]
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previous = entry
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return bytes(out)
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def read_gif(path: Path) -> dict:
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"""Take a GIF apart: the screen, the palette and every frame in it."""
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raw = Path(path).read_bytes()
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assert raw[:6] == b"GIF89a", "not a GIF89a"
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width, height, packed, _bg, _aspect = struct.unpack("<HHBBB", raw[6:13])
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at = 13
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table_size = 2 ** ((packed & 0x07) + 1)
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assert packed & 0x80, "no global colour table"
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palette = np.frombuffer(raw[at:at + table_size * 3],
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dtype=np.uint8).reshape(-1, 3)
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at += table_size * 3
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frames, loops, control = [], False, {}
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while at < len(raw):
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block = raw[at]
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if block == 0x3B: # trailer
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break
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if block == 0x21: # extension
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label = raw[at + 1]
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at += 2
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body = b""
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while raw[at]:
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size = raw[at]
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body += raw[at + 1:at + 1 + size]
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at += size + 1
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at += 1
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if label == 0xF9:
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control = {"disposal": (body[0] >> 2) & 0x07,
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"transparent": body[3] if body[0] & 1 else None,
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"delay": struct.unpack("<H", body[1:3])[0]}
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elif label == 0xFF and body.startswith(b"NETSCAPE2.0"):
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loops = True
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continue
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if block == 0x2C: # image descriptor
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left, top, w, h, flags = struct.unpack("<HHHHB", raw[at + 1:at + 10])
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at += 10
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assert not flags & 0x80, "a local colour table was not expected"
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code_bits = raw[at]
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at += 1
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data = b""
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while raw[at]:
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size = raw[at]
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data += raw[at + 1:at + 1 + size]
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at += size + 1
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at += 1
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pixels = np.frombuffer(lzw_decode(data, code_bits),
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dtype=np.uint8)
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assert pixels.size == w * h, f"{pixels.size} pixels for {w}x{h}"
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frames.append({"left": left, "top": top, "width": w, "height": h,
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"pixels": pixels.reshape(h, w), **control})
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continue
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raise ValueError(f"unknown block {block:#x} at {at}")
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return {"width": width, "height": height, "palette": palette,
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"frames": frames, "loops": loops}
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def played(gif: dict) -> list[np.ndarray]:
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"""Every frame as it appears on the screen, patches laid over each other."""
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canvas = np.zeros((gif["height"], gif["width"]), dtype=np.uint8)
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out = []
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for frame in gif["frames"]:
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patch = frame["pixels"]
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top, left = frame["top"], frame["left"]
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area = canvas[top:top + frame["height"], left:left + frame["width"]]
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if frame.get("transparent") is None:
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area[:, :] = patch
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else:
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keep = patch != frame["transparent"]
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area[keep] = patch[keep]
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out.append(canvas.copy())
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return out
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# ---------------------------------------------------------------------------
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# Tracks to draw
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# ---------------------------------------------------------------------------
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def straight(icao="4CA1FA", callsign="RYR1234", lat=51.0, lon=-1.0,
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heading=90.0, speed=480.0, altitude=35_000, seconds=600.0,
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every=20.0, start=1_000_000.0) -> Track:
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"""One aircraft flying a straight line at a steady speed."""
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from bandsaunter.flightlog import move
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fixes = []
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when = 0.0
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while when <= seconds:
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step = speed * when / 3600.0
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here = move(lat, lon, heading, step)
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fixes.append(Fix(at=start + when, latitude=here[0], longitude=here[1],
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altitude_ft=altitude, ground_speed_kt=speed,
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track_deg=heading))
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when += every
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return Track(icao=icao, callsign=callsign, fixes=fixes,
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frames=len(fixes) * 3, first_seen=start,
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last_seen=start + seconds)
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def two_aircraft() -> list[Track]:
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return [straight(),
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straight(icao="A835AF", callsign="UAL1902", lat=51.4, lon=-0.6,
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heading=250.0, speed=300.0, altitude=9_000)]
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# ---------------------------------------------------------------------------
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# Colours and geometry
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# ---------------------------------------------------------------------------
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def test_the_palette_is_a_full_table_with_room_for_transparency():
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assert fm.PALETTE.shape == (256, 3)
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assert fm.TRANSPARENT == 255
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def test_altitude_becomes_a_colour_that_climbs_with_it():
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steps = [fm.altitude_step(ft) for ft in (0, 5_000, 20_000, 35_000, 45_000)]
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assert steps == sorted(steps)
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assert steps[0] == 0 and steps[-1] == fm.RAMP_STEPS - 1
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assert fm.altitude_step(90_000) == fm.RAMP_STEPS - 1 # clamped
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def test_the_map_holds_every_position_that_was_reported():
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tracks = two_aircraft()
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view = fm.fit(tracks, width=800)
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for track in tracks:
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for fix in track.fixes:
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assert view.inside(fix.latitude, fix.longitude)
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x, y = view.xy(fix.latitude, fix.longitude)
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assert view.left <= x < view.left + view.width
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assert view.top <= y < view.top + view.height
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def test_a_mile_across_is_a_mile_up_the_picture():
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"""Longitude is squeezed by the cosine, or everything at fifty degrees
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north comes out stretched half as wide again."""
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view = fm.fit(two_aircraft(), width=800)
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per_nm_x = view.width / view.width_nm
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tall_nm = (view.north - view.south) * 60.0
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per_nm_y = view.height / tall_nm
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assert per_nm_x == pytest.approx(per_nm_y, rel=0.02)
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def test_one_aircraft_heard_once_still_gets_a_map():
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track = Track(icao="4CA1FA", fixes=[Fix(at=1.0, latitude=51.0,
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longitude=-1.0)])
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view = fm.fit([track], width=400)
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assert view is not None and view.north > view.south
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def test_nothing_to_draw_draws_nothing(tmp_path):
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assert fm.fit([Track(icao="4CA1FA")]) is None
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assert fm.animate([Track(icao="4CA1FA")], tmp_path / "x.gif") is None
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# ---------------------------------------------------------------------------
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# What ends up on the picture
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# ---------------------------------------------------------------------------
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def test_the_background_has_a_grid_a_scale_and_a_title():
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view = fm.fit(two_aircraft(), width=800)
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base = fm.background(view, title="6 AIRCRAFT 2026-09-03")
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assert (base == fm.GRID).sum() > 200 # the graticule and the border
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assert (base == fm.INK).sum() > 40 # the title
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assert (base == fm.DIM).sum() > 40 # scale bar and axis labels
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assert (base == fm.RAMP + fm.RAMP_STEPS - 1).any() # the key
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def test_an_aircraft_is_drawn_where_it_was_at_that_moment():
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tracks = [straight()]
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view = fm.fit(tracks, width=800)
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base = fm.background(view)
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when = tracks[0].first_seen + 300.0
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frame = fm.render_frame(base, view, tracks, when)
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fix = tracks[0].at(when)
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x, y = view.xy(fix.latitude, fix.longitude)
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patch = frame[y - 6:y + 7, x - 6:x + 7]
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assert (patch >= fm.RAMP).any() and (patch < fm.TRAIL).any()
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def test_the_aircraft_moves_between_frames_and_leaves_a_trail():
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tracks = [straight()]
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view = fm.fit(tracks, width=800)
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base = fm.background(view)
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early = fm.render_frame(base, view, tracks, tracks[0].first_seen + 60)
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late = fm.render_frame(base, view, tracks, tracks[0].first_seen + 540)
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assert not np.array_equal(early, late)
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trail_early = (early >= fm.TRAIL) & (early < fm.TRANSPARENT)
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trail_late = (late >= fm.TRAIL) & (late < fm.TRANSPARENT)
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assert trail_late.sum() > trail_early.sum()
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def test_an_aircraft_is_not_drawn_before_it_was_ever_heard():
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tracks = [straight()]
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view = fm.fit(tracks, width=800)
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base = fm.background(view)
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frame = fm.render_frame(base, view, tracks, tracks[0].first_seen - 10)
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assert np.array_equal(frame, base)
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def test_an_aircraft_long_gone_is_not_drawn_at_a_guessed_position():
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tracks = [straight()]
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view = fm.fit(tracks, width=800)
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base = fm.background(view)
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frame = fm.render_frame(base, view, tracks,
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tracks[0].last_seen + 900, stale=300)
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assert np.array_equal(frame, base)
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def test_the_clock_and_the_count_are_drawn_over_the_map():
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tracks = two_aircraft()
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view = fm.fit(tracks, width=800)
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base = fm.background(view)
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frame = fm.render_frame(base, view, tracks, tracks[0].first_seen + 60,
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clock="19:45:02")
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assert (frame == fm.PANEL).any()
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assert (frame == fm.INK).sum() > (base == fm.INK).sum()
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# ---------------------------------------------------------------------------
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# The file
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# ---------------------------------------------------------------------------
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def test_the_lzw_stream_reads_back_as_what_went_in():
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for body in (b"\x00" * 300, bytes(range(256)) * 3,
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bytes([7, 7, 7, 8, 9, 7, 7, 8]) * 40):
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assert lzw_decode(fm._lzw(body, 8), 8) == body
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def test_a_long_stream_survives_the_table_filling_up():
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rng = np.random.default_rng(4)
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body = rng.integers(0, 60, size=200_000, dtype=np.uint8).tobytes()
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assert lzw_decode(fm._lzw(body, 8), 8) == body
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def test_the_animation_is_a_gif_that_loops(tmp_path):
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out = fm.animate(two_aircraft(), tmp_path / "flights.gif", fps=10,
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seconds=4, width=480)
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assert out is not None and out.path.exists()
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gif = read_gif(out.path)
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assert gif["loops"], "a map that plays once and stops"
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assert len(gif["frames"]) == out.frames
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assert (gif["width"], gif["height"]) == (out.width, out.height)
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assert gif["frames"][0]["delay"] == 10 # hundredths, so 10 a second
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def test_only_what_changed_is_written_after_the_first_frame(tmp_path):
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out = fm.animate(two_aircraft(), tmp_path / "flights.gif", fps=8,
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seconds=4, width=480)
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gif = read_gif(out.path)
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first = gif["frames"][0]
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assert (first["width"], first["height"]) == (out.width, out.height)
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later = gif["frames"][1:]
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assert later, "one frame is not an animation"
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assert all(f["width"] * f["height"] < out.width * out.height for f in later)
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assert all(f["transparent"] is not None for f in later)
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def test_the_frames_played_back_show_the_aircraft_moving(tmp_path):
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tracks = [straight()]
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out = fm.animate(tracks, tmp_path / "one.gif", fps=8, seconds=4, width=480)
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screens = played(read_gif(out.path))
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assert len(screens) == out.frames
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def where(frame):
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lit = np.argwhere((frame >= fm.RAMP) & (frame < fm.TRAIL))
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return lit.mean(axis=0)
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start, end = where(screens[1]), where(screens[-1])
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assert abs(end[1] - start[1]) > 20 # it went east across the picture
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for frame in screens:
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assert frame.shape == (out.height, out.width)
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def test_the_animation_says_how_much_flying_it_covers(tmp_path):
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tracks = two_aircraft()
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out = fm.animate(tracks, tmp_path / "flights.gif", fps=10, seconds=5,
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width=400)
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assert out.covers == pytest.approx(600.0, abs=1.0)
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played_for = out.frames / out.fps
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assert played_for == pytest.approx(5.0, rel=0.3)
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assert out.speed == pytest.approx(out.covers / played_for, rel=0.05)
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assert "aircraft" in out.summary()
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def test_asking_for_a_speed_gives_that_speed(tmp_path):
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out = fm.animate(two_aircraft(), tmp_path / "flights.gif", fps=10,
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speed=60.0, width=400)
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assert out.speed == pytest.approx(60.0, rel=0.1)
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assert out.frames == pytest.approx(600 / 60 * 10, abs=2)
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def test_a_still_picture_is_a_png_of_the_whole_evening(tmp_path):
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from bandsaunter.images import PNG_SIGNATURE
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out = fm.animate(two_aircraft(), tmp_path / "flights.png", width=400)
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assert out.kind == "png"
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assert out.path.read_bytes()[:8] == PNG_SIGNATURE
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def test_pillow_agrees_that_it_is_an_animation(tmp_path):
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"""Not a dependency; when it happens to be installed it is a second
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opinion from a decoder nobody here wrote."""
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Image = pytest.importorskip("PIL.Image")
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out = fm.animate(two_aircraft(), tmp_path / "flights.gif", fps=10,
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seconds=3, width=400)
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with Image.open(out.path) as picture:
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assert picture.n_frames == out.frames
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assert picture.size == (out.width, out.height)
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picture.seek(0)
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first = np.array(picture.convert("RGB"))
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picture.seek(picture.n_frames - 1)
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last = np.array(picture.convert("RGB"))
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assert not np.array_equal(first, last)
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@pytest.mark.skipif(not fm.ffmpeg_available(), reason="ffmpeg is not installed")
|
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def test_a_video_can_be_written_where_ffmpeg_exists(tmp_path):
|
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out = fm.animate(two_aircraft(), tmp_path / "flights.mp4", fps=10,
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seconds=3, width=400)
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assert out.kind == "mp4" and out.path.stat().st_size > 1000
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probe = subprocess.run(["ffprobe", "-v", "error", "-select_streams", "v:0",
|
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"-show_entries", "stream=width,height",
|
|
"-of", "csv=p=0", str(out.path)],
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capture_output=True, text=True)
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if probe.returncode == 0:
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assert probe.stdout.strip() == f"{out.width},{out.height}"
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|
|
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def test_the_picture_is_an_even_number_of_pixels_across(tmp_path):
|
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"""Video encoders refuse an odd width, and it costs nothing to be even."""
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|
for width in (401, 402, 555):
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view = fm.fit(two_aircraft(), width=width)
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w, h = fm.canvas_size(view)
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assert w % 2 == 0 and h % 2 == 0
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|
|
|
|
# ---------------------------------------------------------------------------
|
|
# Speeds in whatever the user reads
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|
# ---------------------------------------------------------------------------
|
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|
|
def _label_text(unit: str, width: int = 700) -> np.ndarray:
|
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"""Draw one aircraft and hand back the pixels its label was written in."""
|
|
tracks = [straight(speed=480.0)]
|
|
view = fm.fit(tracks, width=width)
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base = fm.background(view, unit=unit)
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return fm.render_frame(base, view, tracks, tracks[0].first_seen + 120,
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unit=unit)
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|
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|
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def _has_text(frame: np.ndarray, text: str) -> bool:
|
|
"""Whether a string was stamped anywhere in the frame, found by drawing
|
|
it again and looking for the same pattern."""
|
|
from bandsaunter.images import GLYPH_H, draw_text, text_width
|
|
|
|
stamp = np.zeros((GLYPH_H, max(1, text_width(text))), dtype=np.uint8)
|
|
draw_text(stamp, 0, 0, text, 1)
|
|
rows, cols = stamp.shape
|
|
wanted = stamp.astype(bool)
|
|
if not wanted.any():
|
|
return False
|
|
for y in range(frame.shape[0] - rows):
|
|
for x in range(frame.shape[1] - cols):
|
|
patch = frame[y:y + rows, x:x + cols]
|
|
if np.all(patch[wanted] != fm.BG) and \
|
|
np.all(patch[~wanted] == patch[~wanted][0]):
|
|
return True
|
|
return False
|
|
|
|
|
|
@pytest.mark.parametrize("unit,label", [("knots", "KT"), ("mph", "MPH"),
|
|
("kph", "KM/H")])
|
|
def test_the_speed_on_the_map_carries_its_unit(unit, label):
|
|
"""A bare 480 beside an aircraft is three different speeds depending on
|
|
who is reading it."""
|
|
assert _has_text(_label_text(unit), label)
|
|
|
|
|
|
def test_the_number_beside_it_is_converted():
|
|
assert _has_text(_label_text("knots"), "480KT")
|
|
assert _has_text(_label_text("mph"), "552MPH")
|
|
assert _has_text(_label_text("kph"), "889KM/H")
|
|
|
|
|
|
@pytest.mark.parametrize("unit,label", [("knots", "NM"), ("mph", "MI"),
|
|
("kph", "KM")])
|
|
def test_the_scale_bar_uses_the_same_kind_of_mile(unit, label):
|
|
"""Miles an hour beside a scale in nautical miles is two different miles
|
|
on one picture."""
|
|
view = fm.fit(two_aircraft(), width=700)
|
|
assert _has_text(fm.background(view, unit=unit), label)
|
|
|
|
|
|
def test_the_animation_takes_the_unit_through_to_the_file(tmp_path):
|
|
out = fm.animate(two_aircraft(), tmp_path / "mph.png", width=500,
|
|
unit="mph")
|
|
assert out is not None and out.path.is_file()
|
|
|
|
|
|
# ---------------------------------------------------------------------------
|
|
# Framing the picture on the receiver
|
|
# ---------------------------------------------------------------------------
|
|
|
|
def far_away(icao="BAD001", lat=-9.5, lon=-112.5) -> Track:
|
|
"""One aircraft in the wrong hemisphere: a decode that went wrong."""
|
|
return Track(icao=icao, callsign="GHOST",
|
|
fixes=[Fix(at=1_000_000.0, latitude=lat, longitude=lon,
|
|
altitude_ft=35_000, ground_speed_kt=400.0)],
|
|
first_seen=1_000_000.0, last_seen=1_000_000.0)
|
|
|
|
|
|
def test_the_middle_of_what_was_heard_is_where_the_receiver_is():
|
|
"""A median, so a handful of wrong positions cannot drag it anywhere."""
|
|
from bandsaunter.flightlog import centre_of
|
|
|
|
tracks = two_aircraft() + [far_away(), far_away("BAD002", 60.0, 120.0)]
|
|
lat, lon = centre_of(tracks)
|
|
assert lat == pytest.approx(51.0, abs=1.0)
|
|
assert lon == pytest.approx(-1.0, abs=1.5)
|
|
|
|
|
|
def test_a_radius_leaves_the_far_ones_off_the_map():
|
|
tracks = two_aircraft() + [far_away()]
|
|
view_all = fm.fit([t for t in tracks if t.located])
|
|
assert view_all.north - view_all.south > 50 # dragged across a globe
|
|
from bandsaunter.flightlog import centre_of, within
|
|
|
|
lat, lon = centre_of(two_aircraft())
|
|
near = [t for t in within(tracks, lat, lon, 100.0) if t.located]
|
|
assert {t.icao for t in near} == {t.icao for t in two_aircraft()}
|
|
|
|
|
|
def test_the_frame_is_the_radius_rather_than_whatever_turned_up():
|
|
"""The scale should not change with the traffic."""
|
|
from bandsaunter.flightlog import box_around, centre_of, distance_nm
|
|
|
|
lat, lon = centre_of(two_aircraft())
|
|
box = box_around(lat, lon, 100.0)
|
|
view = fm.fit(two_aircraft(), width=600, box=box)
|
|
assert view.south == pytest.approx(box[0]) and view.north == pytest.approx(box[2])
|
|
across = distance_nm(lat, box[1], lat, box[3])
|
|
assert across == pytest.approx(200.0, rel=0.02) # a hundred each way
|
|
|
|
|
|
def test_the_radius_is_kept_by_the_animation(tmp_path):
|
|
"""Without one the frame stretches to reach a bad position on the other
|
|
side of the equator, and the real aircraft come out a pixel wide."""
|
|
from bandsaunter.flightlog import box_around, centre_of
|
|
|
|
tracks = two_aircraft() + [far_away()]
|
|
wide = fm.animate(tracks, tmp_path / "wide.png", width=400, radius_nm=0)
|
|
tight = fm.animate(tracks, tmp_path / "tight.png", width=400, radius_nm=100)
|
|
assert wide.aircraft == 3 and tight.aircraft == 2
|
|
|
|
everything = fm.fit([t for t in tracks if t.located], width=400)
|
|
lat, lon = centre_of(two_aircraft())
|
|
framed = fm.fit(two_aircraft(), width=400,
|
|
box=box_around(lat, lon, 100.0))
|
|
assert everything.north - everything.south > 50 # most of a hemisphere
|
|
assert framed.north - framed.south < 4 # a hundred miles
|
|
|
|
|
|
def test_an_explicit_receiver_position_is_used_as_given(tmp_path):
|
|
"""Somewhere with no aircraft near it: everything falls outside."""
|
|
out = fm.animate(two_aircraft(), tmp_path / "elsewhere.png", width=400,
|
|
radius_nm=50, centre=(0.0, 0.0))
|
|
assert out is None
|
|
|
|
|
|
def test_a_track_with_one_bad_fix_keeps_the_rest_of_its_flight():
|
|
"""Per fix rather than per aircraft: one wrong position in the middle of
|
|
a real flight must not take the flight off the map with it."""
|
|
from bandsaunter.flightlog import within
|
|
|
|
track = straight()
|
|
good = len(track.fixes)
|
|
track.fixes.insert(len(track.fixes) // 2,
|
|
Fix(at=track.fixes[0].at + 1, latitude=-9.5,
|
|
longitude=-112.5, altitude_ft=35_000))
|
|
kept = within([track], 51.0, -1.0, 100.0)[0]
|
|
assert len(kept.fixes) == good
|
|
|
|
|
|
# ---------------------------------------------------------------------------
|
|
# Drawing off the edge
|
|
# ---------------------------------------------------------------------------
|
|
|
|
@pytest.mark.parametrize("x,y", [(-28, -89), (-4000, 400), (450, -9000),
|
|
(2000, 400), (450, 4000)])
|
|
def test_an_aircraft_off_the_picture_paints_nothing(x, y):
|
|
"""Clamping the near edge of the centre dot and leaving the far one alone
|
|
reads as a negative slice, which numpy counts back from the far side --
|
|
and fills most of the frame with one colour."""
|
|
img = np.zeros((300, 500), dtype=np.uint8)
|
|
fm._marker(img, x, y, 90.0, 20)
|
|
assert int((img != 0).sum()) == 0
|
|
|
|
|
|
@pytest.mark.parametrize("x,y", [(0, 0), (499, 299), (250, 150)])
|
|
def test_an_aircraft_on_the_picture_is_still_drawn(x, y):
|
|
img = np.zeros((300, 500), dtype=np.uint8)
|
|
fm._marker(img, x, y, 90.0, 20)
|
|
assert 0 < int((img != 0).sum()) < 60
|
|
|
|
|
|
def test_a_still_draws_where_they_were_not_where_they_might_have_got_to():
|
|
"""A still of a whole evening is drawn hours after most of the aircraft
|
|
stopped transmitting; flying them on for those hours would scatter them
|
|
across three states."""
|
|
tracks = [straight(seconds=600.0)]
|
|
view = fm.fit(tracks, width=500)
|
|
base = fm.background(view)
|
|
hours_later = tracks[0].last_seen + 6 * 3600
|
|
projected = fm.render_frame(base, view, tracks, hours_later,
|
|
stale=7 * 3600, project=True, labels=False)
|
|
still = fm.render_frame(base, view, tracks, hours_later,
|
|
stale=7 * 3600, project=False, labels=False)
|
|
|
|
def markers(frame):
|
|
"""Just the aircraft: what changed, in the aircraft colours, inside
|
|
the map itself. The altitude key along the bottom is drawn in those
|
|
same colours and belongs to the background."""
|
|
body = slice(view.top, view.top + view.height), \
|
|
slice(view.left, view.left + view.width)
|
|
drawn = (frame[body] != base[body]) & (frame[body] >= fm.RAMP) & \
|
|
(frame[body] < fm.TRAIL)
|
|
return int(drawn.sum())
|
|
|
|
assert markers(projected) == 0 # flown clean off the picture
|
|
assert markers(still) > 0 # drawn where it last was
|
|
last = tracks[0].fixes[-1]
|
|
x, y = view.xy(last.latitude, last.longitude)
|
|
assert (still[y - 6:y + 7, x - 6:x + 7] >= fm.RAMP).any()
|
|
|
|
|
|
def test_a_whole_evening_as_one_picture_keeps_every_aircraft_on_it(tmp_path):
|
|
tracks = two_aircraft()
|
|
for t in tracks: # heard hours ago
|
|
for f in t.fixes:
|
|
f.at -= 6 * 3600
|
|
t.first_seen -= 6 * 3600
|
|
t.last_seen -= 6 * 3600
|
|
tracks.append(straight(icao="C0FFEE", callsign="LATE", lat=51.2, lon=-0.9))
|
|
out = fm.animate(tracks, tmp_path / "evening.png", width=500)
|
|
assert out is not None and out.aircraft == 3
|
|
|
|
|
|
# ---------------------------------------------------------------------------
|
|
# Throwing out what could not have happened
|
|
# ---------------------------------------------------------------------------
|
|
|
|
def _with_bad_fix(track: Track, at_index: int, lat=-9.5, lon=-112.5) -> Track:
|
|
"""Drop one impossible position into the middle of a real flight."""
|
|
when = track.fixes[at_index].at + 0.001
|
|
track.fixes.insert(at_index + 1,
|
|
Fix(at=when, latitude=lat, longitude=lon,
|
|
altitude_ft=35_000, ground_speed_kt=400.0))
|
|
return track
|
|
|
|
|
|
def test_a_position_no_aircraft_could_reach_is_thrown_out():
|
|
from bandsaunter.flightlog import recheck
|
|
|
|
track = _with_bad_fix(straight(), 10)
|
|
good = len(track.fixes) - 1
|
|
clean, dropped = recheck([track])
|
|
assert dropped == 1
|
|
assert len(clean[0].fixes) == good
|
|
assert all(-90 <= f.latitude <= 90 for f in clean[0].fixes)
|
|
|
|
|
|
def test_a_flight_that_is_entirely_real_loses_nothing():
|
|
from bandsaunter.flightlog import recheck
|
|
|
|
clean, dropped = recheck(two_aircraft())
|
|
assert dropped == 0
|
|
assert [len(t.fixes) for t in clean] == [len(t.fixes) for t in two_aircraft()]
|
|
|
|
|
|
def test_a_bad_position_early_on_does_not_take_the_flight_with_it():
|
|
"""Keeping whatever is reachable from the last position kept lets one
|
|
bad fix become the reference, and then the truth is what gets thrown
|
|
away. On a real recording that discarded a fifth of everything."""
|
|
from bandsaunter.flightlog import recheck
|
|
|
|
track = _with_bad_fix(straight(), 0)
|
|
clean, dropped = recheck([track])
|
|
assert dropped == 1
|
|
assert len(clean[0].fixes) == len(straight().fixes)
|
|
|
|
|
|
def test_a_run_of_bad_positions_that_agree_with_each_other_still_goes():
|
|
"""Three bad decodes can land in the same wrong place and agree
|
|
perfectly; they are still wrong."""
|
|
from bandsaunter.flightlog import recheck
|
|
|
|
track = straight()
|
|
where = 10
|
|
for i in range(3):
|
|
track.fixes.insert(where + 1 + i,
|
|
Fix(at=track.fixes[where].at + 0.001 * (i + 1),
|
|
latitude=-9.5 + i * 0.001, longitude=-112.5,
|
|
altitude_ft=35_000))
|
|
clean, dropped = recheck([track])
|
|
assert dropped == 3
|
|
assert all(f.latitude > 0 for f in clean[0].fixes)
|
|
|
|
|
|
def test_a_position_that_is_not_on_earth_never_survives():
|
|
from bandsaunter.flightlog import recheck
|
|
|
|
track = _with_bad_fix(straight(), 5, lat=239.6, lon=-111.0)
|
|
clean, _ = recheck([track])
|
|
assert all(-90 <= f.latitude <= 90 for f in clean[0].fixes)
|
|
|
|
|
|
def test_an_aircraft_that_went_quiet_and_came_back_is_not_an_error():
|
|
"""Out of range for ten minutes, then heard again a long way off: that
|
|
is an aeroplane, not a bad decode, and there is no way to say otherwise."""
|
|
from bandsaunter.flightlog import recheck
|
|
|
|
track = straight(seconds=200.0)
|
|
last = track.fixes[-1]
|
|
track.fixes.append(Fix(at=last.at + 900, latitude=last.latitude + 1.5,
|
|
longitude=last.longitude + 2.0,
|
|
altitude_ft=35_000, ground_speed_kt=480.0))
|
|
clean, dropped = recheck([track])
|
|
assert dropped == 0
|
|
|
|
|
|
def test_two_positions_that_contradict_each_other_do_not_both_stand():
|
|
"""One of them is wrong and nothing says which; what comes out has at
|
|
least to be a story."""
|
|
from bandsaunter.flightlog import recheck
|
|
|
|
track = Track(icao="4CA1FA", fixes=[
|
|
Fix(at=0.0, latitude=51.5, longitude=-0.12),
|
|
Fix(at=0.5, latitude=-9.5, longitude=-112.5)])
|
|
clean, dropped = recheck([track])
|
|
assert dropped == 1
|
|
assert len(clean[0].fixes) == 1
|
|
|
|
|
|
def test_a_jitter_of_a_few_yards_is_never_called_an_error():
|
|
"""Positions arrive twice a second and are stamped to the millisecond,
|
|
so two of them a thousandth of a second apart imply thousands of knots
|
|
across a few yards."""
|
|
from bandsaunter.flightlog import recheck
|
|
|
|
track = Track(icao="4CA1FA", fixes=[
|
|
Fix(at=0.0, latitude=51.5000, longitude=-0.1200),
|
|
Fix(at=0.001, latitude=51.5001, longitude=-0.1201),
|
|
Fix(at=0.002, latitude=51.5002, longitude=-0.1202)])
|
|
clean, dropped = recheck([track])
|
|
assert dropped == 0
|
|
|
|
|
|
def test_nothing_survives_that_needed_an_impossible_speed():
|
|
"""The promise of the whole thing, said as one assertion."""
|
|
from bandsaunter.flightlog import (MAX_GROUND_SPEED_KT, distance_nm,
|
|
implied_speed_kt, recheck)
|
|
|
|
tracks = [_with_bad_fix(straight(), i) for i in (3, 12, 20)]
|
|
clean, dropped = recheck(tracks)
|
|
assert dropped == 3
|
|
for track in clean:
|
|
for a, b in zip(track.fixes, track.fixes[1:]):
|
|
if 0 < b.at - a.at <= 300 and distance_nm(
|
|
a.latitude, a.longitude, b.latitude, b.longitude) > 2:
|
|
assert implied_speed_kt(a, b) <= MAX_GROUND_SPEED_KT
|
|
|
|
|
|
# ---------------------------------------------------------------------------
|
|
# What is written beside each aircraft
|
|
# ---------------------------------------------------------------------------
|
|
|
|
class _Entry:
|
|
"""A register's answer, in the shape flightmap reads it."""
|
|
|
|
def __init__(self, **over):
|
|
self.type_code = over.get("type_code", "B739")
|
|
self.model = over.get("model", "737-932ER")
|
|
self.registration = over.get("registration", "N904DN")
|
|
self.origin_code = over.get("origin_code", "KATL")
|
|
self.origin = over.get("origin", "Atlanta")
|
|
self.origin_country = over.get("origin_country", "US")
|
|
self.destination_code = over.get("destination_code", "EGLL")
|
|
self.destination = over.get("destination", "London Heathrow")
|
|
self.destination_country = over.get("destination_country", "GB")
|
|
# The map draws an airport where a lookup gave it a position.
|
|
self.origin_lat = over.get("origin_lat", 33.6367)
|
|
self.origin_lon = over.get("origin_lon", -84.4281)
|
|
self.destination_lat = over.get("destination_lat", 51.4706)
|
|
self.destination_lon = over.get("destination_lon", -0.4619)
|
|
|
|
|
|
def test_the_label_says_height_speed_type_and_both_ends_of_the_route():
|
|
track = straight()
|
|
rows = fm.label_lines(track, track.fixes[0], "knots", _Entry())
|
|
text = [line for line, _flag in rows]
|
|
assert text[0].startswith("350") # flight level
|
|
assert "480KT" in text[0]
|
|
assert "B739 N904DN" in text
|
|
assert "KATL" in text and "EGLL" in text
|
|
|
|
|
|
def test_each_end_of_the_route_carries_its_own_country():
|
|
track = straight()
|
|
rows = dict((line, flag) for line, flag in
|
|
fm.label_lines(track, track.fixes[0], "knots", _Entry()))
|
|
assert rows["KATL"] == "US"
|
|
assert rows["EGLL"] == "GB"
|
|
|
|
|
|
def test_with_no_register_the_label_is_what_the_aircraft_itself_said():
|
|
track = straight()
|
|
rows = fm.label_lines(track, track.fixes[0], "knots", None)
|
|
assert len(rows) == 1 and rows[0][1] == ""
|
|
|
|
|
|
def test_an_airport_with_no_code_is_named_short_rather_than_in_full():
|
|
track = straight()
|
|
entry = _Entry(origin_code="", origin="Hartsfield Jackson Atlanta "
|
|
"International Airport")
|
|
said = [line for line, _ in fm.label_lines(track, track.fixes[0],
|
|
"knots", entry)]
|
|
assert "Hartsfield Jackson" in said
|
|
assert not any(len(line) > 20 for line in said), said
|
|
|
|
|
|
def test_the_flag_is_drawn_in_the_flag_colours():
|
|
from bandsaunter.flags import COLOUR_ORDER, FLAG_H, FLAG_W
|
|
|
|
img = np.full((40, 60), fm.BG, dtype=np.uint8)
|
|
fm.draw_flag(img, 5, 5, "JP")
|
|
patch = img[5:5 + FLAG_H, 5:5 + FLAG_W]
|
|
assert (patch >= fm.FLAG).all()
|
|
assert (patch < fm.FLAG + len(COLOUR_ORDER)).all()
|
|
# White at the corner and red in the middle: the flag of Japan.
|
|
assert patch[0, 0] == fm.flag_index("w")
|
|
assert patch[4, 6] == fm.flag_index("r")
|
|
|
|
|
|
def test_a_country_with_no_flag_is_named_in_letters_instead():
|
|
img = np.full((40, 60), fm.BG, dtype=np.uint8)
|
|
fm.draw_flag(img, 5, 5, "ZZ")
|
|
assert (img == fm.GRID).any() # the letters, in grey
|
|
assert not (img >= fm.FLAG).any() # and no flag pretending to be one
|
|
|
|
|
|
def test_a_flag_off_the_edge_of_the_picture_paints_nothing():
|
|
for x, y in ((-40, 5), (5, -40), (200, 5), (5, 200)):
|
|
img = np.full((40, 60), fm.BG, dtype=np.uint8)
|
|
fm.draw_flag(img, x, y, "US")
|
|
assert (img == fm.BG).all(), (x, y)
|
|
|
|
|
|
def test_the_flag_colours_fit_in_the_palette_beside_everything_else():
|
|
from bandsaunter.flags import COLOUR_ORDER
|
|
|
|
assert fm.FLAG + len(COLOUR_ORDER) < fm.TRANSPARENT
|
|
assert fm.PALETTE.shape == (256, 3)
|
|
# And each index really is the colour it claims.
|
|
from bandsaunter.flags import COLOURS
|
|
|
|
for letter in COLOUR_ORDER:
|
|
assert tuple(int(v) for v in fm.PALETTE[fm.flag_index(letter)]) == \
|
|
COLOURS[letter]
|
|
|
|
|
|
def test_the_register_is_asked_once_per_aircraft_not_once_per_frame(tmp_path):
|
|
"""A five-hundred-frame animation asking the same question five hundred
|
|
times would be five hundred times as rude."""
|
|
asked = []
|
|
|
|
class _Book:
|
|
def get(self, icao, callsign=""):
|
|
asked.append(icao)
|
|
return _Entry()
|
|
|
|
fm.animate(two_aircraft(), tmp_path / "counted.gif", fps=8, seconds=3,
|
|
width=400, book=_Book())
|
|
assert asked, "the register was never asked at all"
|
|
assert len(asked) == len(set(asked)), f"asked twice about the same: {asked}"
|
|
|
|
|
|
def test_the_route_reaches_the_drawn_picture(tmp_path):
|
|
"""End to end: a register with a route, and the flags on the frame."""
|
|
class _Book:
|
|
def get(self, icao, callsign=""):
|
|
return _Entry()
|
|
|
|
tracks = two_aircraft()
|
|
view = fm.fit(tracks, width=700)
|
|
base = fm.background(view)
|
|
known = {t.icao: _Entry() for t in tracks}
|
|
frame = fm.render_frame(base, view, tracks, tracks[0].first_seen + 60,
|
|
known=known)
|
|
assert (frame >= fm.FLAG).any(), "no flag was drawn"
|
|
assert _has_text(frame, "KATL")
|
|
assert _has_text(frame, "B739")
|
|
|
|
|
|
def test_a_crowded_frame_goes_back_to_the_short_label():
|
|
"""Five lines beside each of three hundred aircraft is not more
|
|
information, it is a page of overlapping text with a map behind it."""
|
|
many = [straight(icao=f"{i:06X}", callsign=f"FLT{i}",
|
|
lat=51.0 + i * 0.02, lon=-1.0 + i * 0.02)
|
|
for i in range(fm.CROWDED + 4)]
|
|
view = fm.fit(many, width=900)
|
|
base = fm.background(view)
|
|
known = {t.icao: _Entry() for t in many}
|
|
frame = fm.render_frame(base, view, many, many[0].first_seen + 60,
|
|
known=known)
|
|
assert not (frame >= fm.FLAG).any(), "still drawing flags when crowded"
|
|
assert not _has_text(frame, "B739")
|
|
|
|
|
|
def test_a_quiet_frame_keeps_every_detail():
|
|
tracks = two_aircraft()
|
|
view = fm.fit(tracks, width=700)
|
|
base = fm.background(view)
|
|
known = {t.icao: _Entry() for t in tracks}
|
|
frame = fm.render_frame(base, view, tracks, tracks[0].first_seen + 60,
|
|
known=known)
|
|
assert (frame >= fm.FLAG).any()
|
|
assert _has_text(frame, "B739")
|
|
|
|
|
|
def test_the_callsign_and_height_survive_a_crowd():
|
|
"""Whatever else goes, what the aircraft itself said stays."""
|
|
many = [straight(icao=f"{i:06X}", callsign=f"FLT{i}",
|
|
lat=51.0 + i * 0.02, lon=-1.0 + i * 0.02)
|
|
for i in range(fm.CROWDED + 4)]
|
|
view = fm.fit(many, width=900)
|
|
frame = fm.render_frame(fm.background(view), view, many,
|
|
many[0].first_seen + 60,
|
|
known={t.icao: _Entry() for t in many})
|
|
assert _has_text(frame, "FLT0")
|
|
|
|
|
|
def test_labels_step_aside_rather_than_landing_on_each_other():
|
|
"""Two aircraft passing close together is exactly the moment somebody is
|
|
looking at that part of the picture."""
|
|
close = [straight(icao=f"{i:06X}", callsign=f"FLT{i}",
|
|
lat=51.0 + i * 0.004, lon=-1.0 + i * 0.004, seconds=60)
|
|
for i in range(6)]
|
|
view = fm.fit(close, width=800, box=(50.8, -1.4, 51.3, -0.6))
|
|
taken = []
|
|
base = fm.background(view)
|
|
fm.render_frame(base, view, close, close[0].first_seen, labels=True)
|
|
# Place them by hand so the boxes can be compared.
|
|
for track in close:
|
|
now = track.at(track.first_seen)
|
|
x, y = view.xy(now.latitude, now.longitude)
|
|
fm._label(base, x, y, track, now, fm.RAMP, taken)
|
|
for i, one in enumerate(taken):
|
|
for two in taken[i + 1:]:
|
|
assert not fm._overlaps(one, two), f"{one} overlaps {two}"
|
|
|
|
|
|
# ---------------------------------------------------------------------------
|
|
# The country an aircraft is registered in
|
|
# ---------------------------------------------------------------------------
|
|
|
|
def test_the_registration_carries_the_country_it_is_registered_in():
|
|
track = straight()
|
|
entry = _Entry()
|
|
entry.owner_country = "United Kingdom"
|
|
rows = dict((text, flag) for text, flag in
|
|
fm.label_lines(track, track.fixes[0], "knots", entry))
|
|
assert rows["B739 N904DN"] == "GB"
|
|
|
|
|
|
def test_the_address_block_stands_in_when_a_register_says_nothing():
|
|
"""The 24-bit address says which country issued it, by treaty, with no
|
|
website involved at all."""
|
|
track = straight()
|
|
entry = _Entry()
|
|
entry.owner_country = ""
|
|
entry.country = "United States"
|
|
rows = dict(fm.label_lines(track, track.fixes[0], "knots", entry))
|
|
assert rows["B739 N904DN"] == "US"
|
|
|
|
|
|
def test_a_country_nobody_named_gets_no_flag():
|
|
track = straight()
|
|
entry = _Entry()
|
|
entry.owner_country = ""
|
|
entry.country = ""
|
|
rows = dict(fm.label_lines(track, track.fixes[0], "knots", entry))
|
|
assert rows["B739 N904DN"] == ""
|
|
|
|
|
|
# ---------------------------------------------------------------------------
|
|
# Airports on the map
|
|
# ---------------------------------------------------------------------------
|
|
|
|
def test_an_airport_a_route_gave_a_position_for_is_marked():
|
|
known = {"A": _Entry()}
|
|
found = fm._airports_from(known)
|
|
assert {code for code, _, _ in found} == {"KATL", "EGLL"}
|
|
|
|
|
|
def test_an_airport_with_only_a_code_is_looked_up_so_it_can_be_marked():
|
|
"""A route names two airports and often gives a position for neither; an
|
|
airport that cannot be placed cannot be drawn."""
|
|
asked = []
|
|
|
|
class _Book:
|
|
def airports(self, codes):
|
|
asked.extend(codes)
|
|
return [{"code": code, "latitude": 32.1, "longitude": -110.9}
|
|
for code in codes]
|
|
|
|
entry = _Entry(origin_lat=0.0, origin_lon=0.0,
|
|
destination_lat=0.0, destination_lon=0.0)
|
|
found = fm._airports_from({"A": entry}, _Book())
|
|
assert sorted(asked) == ["EGLL", "KATL"]
|
|
assert len(found) == 2
|
|
|
|
|
|
def test_an_airport_that_cannot_be_looked_up_is_simply_not_drawn():
|
|
class _Book:
|
|
def airports(self, codes):
|
|
raise OSError("no network")
|
|
|
|
entry = _Entry(origin_lat=0.0, origin_lon=0.0,
|
|
destination_lat=0.0, destination_lon=0.0)
|
|
assert fm._airports_from({"A": entry}, _Book()) == []
|
|
|
|
|
|
def test_an_airport_already_placed_is_not_looked_up_again():
|
|
asked = []
|
|
|
|
class _Book:
|
|
def airports(self, codes):
|
|
asked.extend(codes)
|
|
return []
|
|
|
|
fm._airports_from({"A": _Entry()}, _Book())
|
|
assert asked == [], "asked about airports it already had"
|
|
|
|
|
|
def test_an_airport_is_drawn_where_it_is_and_named():
|
|
view = fm.fit(two_aircraft(), width=600)
|
|
middle = ((view.south + view.north) / 2, (view.west + view.east) / 2)
|
|
base = fm.background(view, airports=[("EGLL", middle[0], middle[1])])
|
|
x, y = view.xy(*middle)
|
|
marker = (base[y - 4:y + 5, x - 4:x + 5] == fm.AIRPORT)
|
|
assert marker.any(), "no marker where the airport is"
|
|
# And its name beside it, in the same colour, to the right of the marker.
|
|
beside = (base[y - 6:y + 8, x + 5:x + 60] == fm.AIRPORT)
|
|
assert beside.sum() > 10, "the airport was marked but not named"
|
|
|
|
|
|
def test_an_airport_off_the_edge_is_not_drawn():
|
|
view = fm.fit(two_aircraft(), width=600)
|
|
plain = fm.background(view)
|
|
away = fm.background(view, airports=[("KSEA", 47.4, -122.3)])
|
|
assert np.array_equal(plain, away)
|
|
|
|
|
|
# ---------------------------------------------------------------------------
|
|
# How dark the ground is
|
|
# ---------------------------------------------------------------------------
|
|
|
|
def _brightest_drawn(brightness):
|
|
"""The lightest the map actually gets at one brightness setting."""
|
|
top = int(fm.dim_ground(np.array([[fm.GROUND_SHADES - 1]]),
|
|
brightness)[0, 0])
|
|
return fm.PALETTE[fm.GROUND + top].astype(float).mean()
|
|
|
|
|
|
def test_the_map_is_light_enough_to_read():
|
|
"""It was too dark to make out a coastline at all."""
|
|
assert _brightest_drawn(fm.GROUND_BRIGHTNESS) > 110
|
|
|
|
|
|
def test_the_aircraft_stay_brighter_than_the_ground_they_are_over():
|
|
"""Whatever else, the picture has to stay about the aeroplanes."""
|
|
ground = _brightest_drawn(fm.GROUND_BRIGHTNESS)
|
|
for feet in (0, 10_000, 25_000, 40_000):
|
|
marker = fm.PALETTE[fm.RAMP + fm.altitude_step(feet)]
|
|
assert marker.astype(float).mean() > ground, feet
|
|
|
|
|
|
def test_there_is_room_to_turn_it_up_and_down():
|
|
assert _brightest_drawn(1.0) > _brightest_drawn(fm.GROUND_BRIGHTNESS)
|
|
assert _brightest_drawn(0.3) < _brightest_drawn(fm.GROUND_BRIGHTNESS)
|
|
|
|
|
|
@pytest.mark.parametrize("brightness", [0.0, -1.0, 5.0, 1.0, 0.1])
|
|
def test_a_brightness_outside_the_range_is_brought_back_into_it(brightness):
|
|
shades = fm.dim_ground(np.arange(fm.GROUND_SHADES, dtype=np.uint8),
|
|
brightness)
|
|
assert shades.min() >= 0 and shades.max() <= fm.GROUND_SHADES - 1
|
|
|
|
|
|
def test_turning_it_down_really_does_darken_the_picture():
|
|
levels = np.full((20, 20), fm.GROUND_SHADES - 1, dtype=np.uint8)
|
|
assert fm.dim_ground(levels, 0.3).max() < fm.dim_ground(levels, 0.9).max()
|
|
|
|
|
|
def test_the_darkest_ground_is_no_darker_than_the_background():
|
|
darkest = fm.PALETTE[fm.GROUND].astype(float).mean()
|
|
background = fm.PALETTE[fm.BG].astype(float).mean()
|
|
assert darkest >= background
|
|
|
|
|
|
# ---------------------------------------------------------------------------
|
|
# Fading out rather than blinking out
|
|
# ---------------------------------------------------------------------------
|
|
|
|
def test_an_aircraft_still_being_heard_is_at_full_strength():
|
|
track = straight(seconds=120)
|
|
seen = fm.showing(track, track.fixes[-1].at, stale=300.0, fade=20.0)
|
|
assert seen is not None and seen[1] == 1.0
|
|
|
|
|
|
def test_one_that_has_gone_quiet_fades_instead_of_disappearing():
|
|
track = straight(seconds=120)
|
|
last = track.fixes[-1].at
|
|
strengths = []
|
|
for gone in (301, 305, 310, 315, 319):
|
|
seen = fm.showing(track, last + gone, stale=300.0, fade=20.0)
|
|
assert seen is not None, gone
|
|
strengths.append(seen[1])
|
|
assert strengths == sorted(strengths, reverse=True)
|
|
assert strengths[0] > 0.9 and strengths[-1] < 0.1
|
|
|
|
|
|
def test_it_is_gone_once_the_fade_is_over():
|
|
track = straight(seconds=120)
|
|
last = track.fixes[-1].at
|
|
assert fm.showing(track, last + 321, stale=300.0, fade=20.0) is None
|
|
|
|
|
|
def test_no_fade_takes_it_away_the_moment_it_is_given_up_on():
|
|
track = straight(seconds=120)
|
|
last = track.fixes[-1].at
|
|
assert fm.showing(track, last + 301, stale=300.0, fade=0.0) is None
|
|
|
|
|
|
def test_it_fades_where_it_was_last_seen_and_not_where_it_might_be():
|
|
"""The whole reason for giving up on an aircraft is that where it would
|
|
be by now is a guess; fading it along that guess would be inventing an
|
|
aeroplane slowly instead of quickly."""
|
|
track = straight(seconds=120)
|
|
last = track.fixes[-1]
|
|
seen = fm.showing(track, last.at + 310, stale=300.0, fade=20.0)
|
|
assert (seen[0].latitude, seen[0].longitude) == (last.latitude,
|
|
last.longitude)
|
|
|
|
|
|
def test_before_it_was_ever_heard_it_is_still_not_drawn():
|
|
track = straight(seconds=120)
|
|
assert fm.showing(track, track.fixes[0].at - 60, fade=20.0) is None
|
|
|
|
|
|
def test_the_fading_aircraft_is_drawn_in_fainter_colours():
|
|
track = straight(seconds=120)
|
|
view = fm.fit([track], width=500)
|
|
base = fm.background(view)
|
|
last = track.fixes[-1].at
|
|
|
|
def drawn(when):
|
|
"""The aircraft's own pixels: what changed, not what was already
|
|
there. The altitude key along the bottom is painted in the same
|
|
colours and belongs to the background."""
|
|
frame = fm.render_frame(base, view, [track], when, stale=300.0,
|
|
fade=20.0, labels=False)
|
|
return frame[frame != base]
|
|
|
|
fresh = drawn(last)
|
|
faint = drawn(last + 318)
|
|
assert fresh.size and faint.size
|
|
# A live aircraft has its marker in the full colours; its trail behind it
|
|
# is dimmer on purpose, so only the brightest pixels are the test.
|
|
assert (fresh < fm.TRAIL).any(), "a live aircraft was drawn faintly"
|
|
# A nearly gone one has nothing in them at all.
|
|
assert not (faint < fm.FAINT).any(), "a fading aircraft was drawn brightly"
|
|
|
|
|
|
def test_a_faded_aircraft_keeps_its_symbol_and_loses_its_label():
|
|
track = straight(seconds=120)
|
|
view = fm.fit([track], width=500)
|
|
base = fm.background(view)
|
|
last = track.fixes[-1].at
|
|
known = {track.icao: _Entry()}
|
|
faint = fm.render_frame(base, view, [track], last + 318, stale=300.0,
|
|
fade=20.0, known=known)
|
|
assert (faint != base).any(), "nothing was drawn at all"
|
|
assert not _has_text(faint, "B739"), "the label survived the fade"
|
|
|
|
|
|
def test_the_trail_fades_with_the_aircraft_it_belongs_to():
|
|
"""The two are one thing on the picture, and half of it lingering would
|
|
be worse than either."""
|
|
track = straight(seconds=120)
|
|
view = fm.fit([track], width=500)
|
|
base = fm.background(view)
|
|
last = track.fixes[-1].at
|
|
faint = fm.render_frame(base, view, [track], last + 318, stale=300.0,
|
|
fade=20.0, labels=False)
|
|
drawn = faint[faint != base]
|
|
assert drawn.size
|
|
assert drawn.min() >= fm.FAINT, "the trail stayed behind when it faded"
|
|
|
|
|
|
def test_the_faint_colours_are_the_same_hues_only_dimmer():
|
|
for step in (0, 15, 31):
|
|
bright = fm.PALETTE[fm.RAMP + step].astype(float)
|
|
faint = fm.PALETTE[fm.FAINT + step].astype(float)
|
|
assert faint.sum() < bright.sum()
|
|
# The same colour, turned down: the ratios between the channels hold.
|
|
assert np.allclose(faint / max(1e-9, faint.sum()),
|
|
bright / bright.sum(), atol=0.03)
|
|
|
|
|
|
def test_the_palette_still_has_room_after_the_fade_colours():
|
|
assert fm.FAINT + fm.RAMP_STEPS < fm.TRANSPARENT
|
|
assert fm.PALETTE.shape == (256, 3)
|