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index.html
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/
index.html
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<!DOCTYPE html>
<html>
<head>
<title>Render trace visualizer</title>
<script>
CANVAS_USE_RATIO = 0.75;
FRAME_INTERVAL_MS = 50;
VECTOR_NORMALIZED_MAGNITUDE = 30.0;
renderData = new Array();
currentFrame = 0;
playing = false;
timerId = 0;
minX = undefined;
minY = undefined;
maxX = undefined;
maxY = undefined;
function log(x) {
if (console) {
console.log(x);
}
}
function getFlag(flag) {
return document.getElementById(flag).checked;
}
// parses the lines in the textarea, ignoring anything that doesn't have RENDERTRACE.
// for each matching line, tokenizes on whitespace and ignores all tokens prior to
// RENDERTRACE. Additional info can be included at the end of the line, and will be
// displayed but not parsed. Allowed syntaxes:
// <junk> RENDERTRACE <timestamp> rect <color> <x> <y> <width> <height> [extraInfo]
// <junk> RENDERTRACE <timestamp> vector <color> <x> <y> [extraInfo]
function loadData() {
stop();
renderData = new Array();
currentFrame = 0;
minX = undefined;
minY = undefined;
maxX = undefined;
maxY = undefined;
var charPos = 0;
var lastLineLength = 0;
var lines = document.getElementById('trace').value.split(/\r|\n/);
var rendertraceIndex = 0;
for (var i = 0; i < lines.length; i++) {
charPos += lastLineLength;
lastLineLength = lines[i].length + 1;
// skip lines without RENDERTRACE
if (! /RENDERTRACE/.test(lines[i])) {
continue;
}
var tokens = lines[i].split(/\s+/);
var j = 0;
// skip tokens until RENDERTRACE
while (j < tokens.length && tokens[j++] != "RENDERTRACE");
if (j >= tokens.length - 2) {
log("Error parsing line: " + lines[i]);
continue;
}
rendertraceIndex = j - 1;
var timestamp = tokens[j++];
var destIndex = renderData.length;
if (destIndex == 0) {
// create the initial frame
renderData.push({
timestamp: timestamp,
rects: {},
vectors: {}
});
} else if (renderData[destIndex - 1].timestamp == timestamp) {
// timestamp hasn't changed use, so update the previous object
destIndex--;
} else {
// clone a new copy of the last frame and update timestamp
renderData.push(JSON.parse(JSON.stringify(renderData[destIndex - 1])));
renderData[destIndex].timestamp = timestamp;
}
switch (tokens[j++]) {
case "fillrect":
case "rect":
if (j > tokens.length - 5) {
log("Error parsing line: " + lines[i]);
continue;
}
var rect = { type: tokens[j-1] };
var id = tokens[j++];
renderData[destIndex].rects[id] = rect;
rect.x = parseFloat(tokens[j++]);
rect.y = parseFloat(tokens[j++]);
rect.width = parseFloat(tokens[j++]);
rect.height = parseFloat(tokens[j++]);
rect.dataStart = charPos;
rect.dataEnd = charPos + lines[i].length;
if (!getFlag('excludePageFromZoom') || id != 'brown') {
if (typeof minX == "undefined") {
minX = rect.x;
minY = rect.y;
maxX = rect.x + rect.width;
maxY = rect.y + rect.height;
} else {
minX = Math.min(minX, rect.x);
minY = Math.min(minY, rect.y);
maxX = Math.max(maxX, rect.x + rect.width);
maxY = Math.max(maxY, rect.y + rect.height);
}
}
break;
case "vector":
if (j > tokens.length - 3) {
log("Error parsing line: " + lines[i]);
continue;
}
var vector = {};
renderData[destIndex].vectors[tokens[j++]] = vector;
vector.x = parseFloat(tokens[j++]);
vector.y = parseFloat(tokens[j++]);
vector.dataStart = charPos;
vector.dataEnd = charPos + lines[i].length;
break;
default:
log("Error parsing line " + lines[i]);
break;
}
}
if (! renderFrame()) {
alert("No data found; nothing to render!");
}
}
// render the current frame (i.e. renderData[currentFrame])
// returns false if currentFrame is out of bounds, true otherwise
function renderFrame() {
var frame = currentFrame;
if (frame < 0 || frame >= renderData.length) {
log("Invalid frame index");
return false;
}
var canvas = document.getElementById('canvas');
if (! canvas.getContext) {
log("No canvas context");
}
var context = canvas.getContext('2d');
// midpoint of the bounding box
var midX = (minX + maxX) / 2.0;
var midY = (minY + maxY) / 2.0;
// midpoint of the canvas
var cmx = canvas.width / 2.0;
var cmy = canvas.height / 2.0;
// scale factor
var scale = CANVAS_USE_RATIO * Math.min(canvas.width / (maxX - minX), canvas.height / (maxY - minY));
function projectX(value) {
return cmx + ((value - midX) * scale);
}
function projectY(value) {
return cmy + ((value - midY) * scale);
}
function drawRect(color, rect) {
if (rect.type == 'rect') {
context.strokeStyle = color;
context.strokeRect(
projectX(rect.x),
projectY(rect.y),
rect.width * scale,
rect.height * scale);
} else if (rect.type == 'fillrect') {
context.fillStyle = color;
context.fillRect(
projectX(rect.x),
projectY(rect.y),
rect.width * scale,
rect.height * scale);
}
}
// vector is an object containg x,y properties. the vector
// starts from the center of the rect of the same color, and
// extends outwards. the magnitude of the vector is normalized
// to VECTOR_NORMALIZED_MAGNITUDE.
function drawVector(color, vector) {
var baseRect = renderData[frame].rects[color];
if (typeof baseRect == "undefined") {
return;
}
var baseMidX = baseRect.x + (baseRect.width / 2.0);
var baseMidY = baseRect.y + (baseRect.height / 2.0);
var magnitude = Math.sqrt(vector.x * vector.x + vector.y * vector.y);
var dscale = VECTOR_NORMALIZED_MAGNITUDE / magnitude;
context.strokeStyle = color;
context.beginPath();
context.moveTo(projectX(baseMidX), projectY(baseMidY));
context.lineTo(projectX(baseMidX) + (vector.x * dscale), projectY(baseMidY) + (vector.y * dscale));
context.stroke();
context.closePath();
}
// clear canvas
context.fillStyle = 'white';
context.fillRect(0, 0, canvas.width, canvas.height);
var activeData = '';
// draw rects
for (i in renderData[frame].rects) {
drawRect(i, renderData[frame].rects[i]);
activeData += "\n" + document.getElementById('trace').value.substring(renderData[frame].rects[i].dataStart, renderData[frame].rects[i].dataEnd);
}
// draw vectors
for (i in renderData[frame].vectors) {
drawVector(i, renderData[frame].vectors[i]);
activeData += "\n" + document.getElementById('trace').value.substring(renderData[frame].vectors[i].dataStart, renderData[frame].vectors[i].dataEnd);
}
// draw timestamp and frame counter
context.fillStyle = 'black';
context.fillText((frame + 1) + "/" + renderData.length + ": " + renderData[frame].timestamp, 5, 15);
document.getElementById('active').textContent = activeData;
return true;
}
function reset(beginning) {
currentFrame = (beginning ? 0 : renderData.length - 1);
renderFrame();
}
function step(backwards) {
if (playing) {
togglePlay();
}
currentFrame += (backwards ? -1 : 1);
if (! renderFrame()) {
currentFrame -= (backwards ? -1 : 1);
}
}
function togglePlay() {
if (playing) {
clearInterval(timerId);
playing = false;
} else {
timerId = setInterval(function() {
currentFrame++;
if (! renderFrame()) {
currentFrame--;
togglePlay();
}
}, FRAME_INTERVAL_MS);
playing = true;
}
}
function stop() {
if (playing) {
togglePlay();
}
currentFrame = 0;
renderFrame();
}
</script>
</head>
<body>
<textarea id="trace" rows="10" style="width: 700px"></textarea>
<div style="width: 700px">
<input type="checkbox" id="excludePageFromZoom">Exclude page coordinates from zoom calculations<br/>
<button onclick="loadData()">Reload data</button>
</div>
<hr/>
<div style="width: 700px">
<div style="text-align: center">
<button onclick="reset(true)">«</button>
<button onclick="step(true)"><</button>
<button onclick="togglePlay()">|| ▶</button>
<button onclick="stop()">☐</button>
<button onclick="step(false)">></button>
<button onclick="reset(false)">»</button>
</div>
</div>
<canvas id="canvas" width="700" height="600" style="border: solid 1px black; float: left">Canvas not supported!</canvas>
<pre id="active" style="float: left; margin-left: 10px; border: solid 1px black">(currently visible stuff will go here)</pre>
</body>
</html>