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postprocess.html
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<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>CriticalSnake Postprocess</title>
<style>
body {
font-size: 1rem;
}
#osm-map {
position: absolute;
left: 0px;
top: 0px;
width: 100%;
height: 100%;
}
</style>
</head>
<body>
<div id="osm-map"></div>
<link rel="stylesheet" href="3rd-party/leaflet16/leaflet.css">
<script src="3rd-party/leaflet16/leaflet.js"></script>
<script src="3rd-party/leaflet-semicircle20/Semicircle.js"></script>
<script src="3rd-party/jquery35/jquery-3.5.1.min.js"></script>
<script src="3rd-party/geodesy11/latlon-spherical.min.js"></script>
<script src="3rd-party/lzstring14/lz-string.min.js"></script>
<script src="3rd-party/filesaver20/FileSaver.min.js"></script>
<script src="critical-snake/bikemap.js"></script>
<script src="critical-snake/critical-snake.js"></script>
<script>
function parseUrlParams(url) {
const regex = /[?&]([^=#]+)=([^&#]*)/g;
let params = {};
let match;
while(match = regex.exec(url)) {
params[match[1]] = match[2];
}
return params;
}
const params = parseUrlParams(window.location.href);
const bikeMap = createBikeMap(L);
bikeMap.browseGroup.show();
bikeMap.loadingGroup.hide();
bikeMap.playbackGroup.hide();
bikeMap.statsLabel.hide();
let playbackFrameIdx = 0;
let playbackDataset = null;
bikeMap.playbackButton.click(() => {
if (playbackDataset) {
if (isRunning())
pause();
else
resume();
}
});
bikeMap.historySlider.attr({ min: 0, max: 500 });
$(document).on("input", bikeMap.historySlider, () => {
if (playbackDataset) {
playbackFrameIdx = parseInt(bikeMap.historySlider.val());
refreshView(playbackFrameIdx);
}
});
let playbackFPS = 15;
$(document).on("change", bikeMap.fpsInput, () => {
playbackFPS = parseInt(bikeMap.fpsInput.val());
console.log("FPS changed to", playbackFPS);
});
let playbackRecording = null;
bikeMap.browseButton.change(function() {
// Validate selection and set visual indication for the loading progress.
bikeMap.browseGroup.hide();
bikeMap.loadingGroup.show();
if (this.files.length == 0)
return;
if (this.files.length > 1)
console.warn("Can only playback one file at a time:", this.files[0].name);
// Load and parse the actual file content.
const reader = new FileReader();
$(reader).on('load', (event) => {
try {
loadRecording(event.target.result);
playbackRecording = this.files[0].name;
bikeMap.playbackGroup.show();
bikeMap.statsLabel.show();
}
catch (ex) {
bikeMap.browseGroup.show();
console.error("JSON parsing for file", this.files[0].name,
"failed with", ex);
}
bikeMap.loadingGroup.hide();
});
reader.readAsText(this.files[0]);
});
bikeMap.downloadButton.click(function() {
bikeMap.playbackGroup.hide();
bikeMap.loadingGroup.show();
// Give the UI a chance to refresh and show the loading state.
setTimeout(() => {
const baseName = playbackRecording.endsWith(".json")
? playbackRecording.slice(0, -5)
: playbackRecording;
downloadReplay(baseName + ".replay", {
begin: playbackDataset.begin,
end: playbackDataset.end,
dataPoints: playbackDataset.dataPoints,
circles: playbackDataset.circles,
segments: playbackDataset.segments,
});
bikeMap.loadingGroup.hide();
bikeMap.playbackGroup.show();
}, 10);
});
// ----------------------------------------------------
function loadRecording(compressedDataSet) {
const PostProcessor = new CriticalSnake.PostProcessor();
const kilobyte = (str) => Math.round((str.length * 2) / 1024);
const decompressionBegin = Date.now();
const rawDataSet = LZString.decompressFromUTF16(compressedDataSet);
console.log("Compressed size is:", kilobyte(compressedDataSet), "KB");
console.log("Decompressed size is:", kilobyte(rawDataSet), "KB");
console.log("Decompression took:", Date.now() - decompressionBegin, "ms");
const analyzeTracksBegin = Date.now();
const [ tracks, dataPoints ] = PostProcessor.analyzeTracks(JSON.parse(rawDataSet));
console.log("Data-points:", dataPoints);
console.log("Analyzing tracks took:", Date.now() - analyzeTracksBegin, "ms");
const detectCirclesBegin = Date.now();
const circles = PostProcessor.detectCircles(dataPoints);
console.log("Circles:", circles);
console.log("Populating circles took:", Date.now() - detectCirclesBegin, "ms");
const startTime = 1598638200000; // 2020-08-28, 20:10
const associateSnakesBegin = Date.now();
const snakes = PostProcessor.associateSnakes(dataPoints, circles, { startTime: startTime });
console.log("Snakes detected by origin:", snakes);
console.log("Associating snakes took:", Date.now() - associateSnakesBegin, "ms");
const populateTrackSegmentsBegin = Date.now();
const segments = PostProcessor.populateTrackSegments(dataPoints, tracks, circles);
console.log("Segments:", segments);
console.log("Populating track segments took:", Date.now() - populateTrackSegmentsBegin, "ms");
const minute = 60 * 1000;
const timeRange = PostProcessor.getTimeRange(circles);
console.log("Data covers time range\nfrom:", timeRange.begin, "\nto:", timeRange.end);
playbackDataset = {
dataPoints: dataPoints,
circles: circles,
tracks: tracks,
segments: segments,
begin: timeRange.begin.getTime() - 5 * minute,
end: timeRange.end.getTime(),
};
playbackFrameIdx = 0;
refreshView(playbackFrameIdx);
}
function downloadReplay(filename, json) {
const kilobyte = (str) => Math.round((str.length * 2) / 1024);
const text = JSON.stringify(json);
console.log("Raw size is:", kilobyte(text), "KB");
const compressed = LZString.compressToUTF16(text);
console.log("Compressed size is:", kilobyte(compressed), "KB");
const blob = new Blob([compressed], {type: "text/plain;charset=utf-16"});
saveAs(blob, filename);
}
function refreshView(frameIdx) {
const refreshViewBegin = Date.now();
bikeMap.historySlider.val(frameIdx);
const duration = playbackDataset.end - playbackDataset.begin;
const offset = duration * (frameIdx / 500);
const timestamp = playbackDataset.begin + offset;
const bikeCount = drawTracks(playbackDataset, timestamp);
// Adds a leading "0" for single digit values.
const pad2 = (val) => (val < 10 ? "0" : "") + val;
const d = new Date(timestamp);
bikeMap.statsLabel.text(
`📅 ${d.getFullYear()}-${pad2(d.getMonth() + 1)}-${pad2(d.getDate())} ` +
`🕗 ${pad2(d.getHours())}:${pad2(d.getMinutes())} ` +
`📍🚲 ${bikeCount}`);
const diff = Date.now() - refreshViewBegin;
console.log("Rendering frame took:", Math.round(diff / 10) * 10, "ms");
}
// ----------------------------------------------------
let rotatingCollisionCircles = 0;
const drawFrameAction = () => {
rotatingCollisionCircles += playbackFPS;
switch (playbackFrameIdx) {
case 0:
refreshView(playbackFrameIdx);
playbackFrameIdx += 1;
break;
case 500:
refreshView(playbackFrameIdx);
bikeMap.playbackButton.val("▶");
playbackFrameIdx = 0;
break;
default:
refreshView(playbackFrameIdx);
playbackFrameIdx += 1;
break;
}
};
function resume() {
console.log("Rendering", playbackFPS, "FPS (", 1000 / playbackFPS, "ms per frame)");
bikeMap.playbackButton.val("||");
const nextFrameAction = () => {
drawFrameAction();
if (isRunning())
setTimeout(nextFrameAction, 1000 / playbackFPS);
};
setTimeout(nextFrameAction, 1000 / playbackFPS);
}
function pause() {
bikeMap.playbackButton.val("▶");
}
function isRunning() {
return bikeMap.playbackButton.val() != "▶";
}
// ----------------------------------------------------
let trackHeads = L.layerGroup([], { pane: "markerPane" });
let trackShadows = L.layerGroup([], { pane: "shadowPane" });
function drawTracks(dataset, stamp) {
bikeMap.removeLayer(trackHeads);
bikeMap.removeLayer(trackShadows);
if (L.Browser.mobile) {
// At this point we better avoid drawing track shadows on mobile,
// because it's too resource intense for most devices.
}
else {
trackShadows.clearLayers();
drawShadows(trackShadows, dataset.dataPoints, dataset.segments, stamp);
trackShadows.addTo(bikeMap);
}
trackHeads.clearLayers();
const visibleBikes = drawCircles(trackHeads, dataset.dataPoints,
dataset.circles, stamp);
trackHeads.addTo(bikeMap);
return visibleBikes;
}
function colors(snakeIdx) {
if (snakeIdx == null)
return "#888";
const snakeColors = [
"#c90002", // red
"#1b3d9f", // blue
"#ff0099", // pink
"#005214", // green
"#8b00ff", // violett
];
if (snakeIdx >= 0 && snakeIdx < snakeColors.length)
return snakeColors[snakeIdx];
return "#000";
}
function drawShadows(canvas, dataPoints, segments, stamp) {
const startedAlready = (seg) => seg.first_stamp <= stamp;
const didNotStartYet = (idx) => !startedAlready(dataPoints[idx]);
const findEndIndex = (seg) => {
if (seg.last_stamp <= stamp)
return -1;
return seg.dataPointIdxs.findIndex(idx => didNotStartYet(idx));
};
for (const segment of segments.filter(startedAlready)) {
// Draw non-associated track segments?
//if (segment.snakeIdxs.length == 0)
// continue;
// Draw segment entirely or only the first number of data-points.
const end = findEndIndex(segment);
const coordIdxs = end < 0 ? segment.dataPointIdxs
: segment.dataPointIdxs.slice(0, end);
for (const snakeIdx of segment.snakeIdxs) {
canvas.addLayer(
L.polyline(coordIdxs.map(idx => dataPoints[idx]), {
color: colors(snakeIdx),
opacity: 0.05
}));
}
}
}
function drawCircles(canvas, dataPoints, circles, stamp) {
const fullCircle = (c, idx) => L.circle(c, {
color: colors(idx),
fillOpacity: 0.75,
radius: 10 * Math.log2(c.dataPointIdxs.length),
stroke: false,
});
const semiCircle = (c, idx, from, to) => L.semiCircle(c, {
color: colors(idx),
fillOpacity: 0.75,
radius: 10 * Math.log2(c.dataPointIdxs.length),
startAngle: from,
stopAngle: to,
stroke: false,
});
const inTime = (c) => c.first_stamp <= stamp && c.last_stamp >= stamp;
const trackIdxs = new Set();
for (const circle of circles.filter(c => inTime(c))) {
circle.dataPointIdxs.forEach(idx => trackIdxs.add(dataPoints[idx].trackIdx));
switch (circle.snakeIdxs.length) {
case 0:
canvas.addLayer(fullCircle(circle, null));
break;
case 1:
canvas.addLayer(fullCircle(circle, circle.snakeIdxs[0]));
break;
default:
let angle = rotatingCollisionCircles;
const arcSize = 360 / circle.snakeIdxs.length;
for (const idx of circle.snakeIdxs) {
canvas.addLayer(semiCircle(circle, idx, angle, angle + arcSize));
angle += arcSize;
}
break;
}
}
return trackIdxs.size;
}
</script>
</body>
</html>