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https://github.com/scratchfoundation/paper.js.git
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Add Vektor example to Tools.
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Jonathan Puckey
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commit
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1 changed files with 207 additions and 0 deletions
207
examples/Tools/Vektor.html
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207
examples/Tools/Vektor.html
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<!DOCTYPE html>
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<html>
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<title>Example</title>
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<link rel="stylesheet" href="../css/style.css">
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<script type="text/javascript">var root = '../../'</script>
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<script type="text/javascript" src="../../src/load.js"></script>
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<script type="text/paperscript" canvas="canvas">
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project.currentStyle.fillColor = 'black';
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////////////////////////////////////////////////////////////////////////////////
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// Interface
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var values = {
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fixLength: false,
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fixAngle: false,
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showCircle: false,
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showAngleLength: true,
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showCoordinates: false
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};
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////////////////////////////////////////////////////////////////////////////////
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// Vector
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var vectorStart, vector, vectorPrevious;
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var vectorItem, items, dashedItems;
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function processVector(event, drag) {
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vector = event.point - vectorStart;
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if (vectorPrevious) {
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if (values.fixLength && values.fixAngle) {
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vector = vectorPrevious;
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} else if (values.fixLength) {
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vector.length = vectorPrevious.length;
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} else if (values.fixAngle) {
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vector = vector.project(vectorPrevious);
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}
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}
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drawVector(drag);
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}
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function drawVector(drag) {
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if (items) {
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for (var i = 0, l = items.length; i < l; i++) {
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items[i].remove();
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}
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}
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if (vectorItem)
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vectorItem.remove();
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items = [];
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var arrowVector = vector.normalize(10);
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var end = vectorStart + vector;
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vectorItem = new Group([
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new Path([vectorStart, end]),
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new Path([
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end + arrowVector.rotate(135),
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end,
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end + arrowVector.rotate(-135)
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])
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]);
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vectorItem.style = {
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strokeWidth: 0.75,
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strokeColor: '#e4141b',
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dashArray: [],
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fillColor: null
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};
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// Display:
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dashedItems = [];
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// Draw Circle
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if (values.showCircle) {
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dashedItems.push(new Path.Circle(vectorStart, vector.length));
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}
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// Draw Labels
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if (values.showAngleLength) {
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if (drawAngle(vectorStart, vector, !drag) && !drag) {
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drawLength(vectorStart, end, vector.angle < 0 ? -1 : 1, true);
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}
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}
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var quadrant = vector.quadrant;
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if (values.showCoordinates && !drag) {
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drawLength(vectorStart, vectorStart + [vector.x, 0],
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[1, 3].indexOf(quadrant) != -1 ? -1 : 1, true, vector.x, 'x: ');
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drawLength(vectorStart, vectorStart + [0, vector.y],
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[1, 3].indexOf(quadrant) != -1 ? 1 : -1, true, vector.y, 'y: ');
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}
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for (var i = 0, l = dashedItems.length; i < l; i++) {
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var item = dashedItems[i];
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item.style = {
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strokeColor: '#000000',
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fillColor: null,
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dashArray: [1, 2]
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};
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items.push(item);
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}
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// Update palette
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values.x = vector.x;
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values.y = vector.y;
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values.length = vector.length;
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values.angle = vector.angle;
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}
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function drawAngle(center, vector, label) {
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var radius = 25, threshold = 10;
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if (vector.length > radius + threshold) {
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var from = new Point(radius, 0);
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var through = from.rotate(vector.angle / 2);
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var to = from.rotate(vector.angle);
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var end = center + to;
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dashedItems.push(new Path.Line(center,
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center + new Point(radius + threshold, 0)));
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dashedItems.push(new Path.Arc(center + from, center + through, end));
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var arrowVector = to.normalize(7.5).rotate(vector.angle < 0 ? -90 : 90);
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dashedItems.push(new Path([
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end + arrowVector.rotate(135),
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end,
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end + arrowVector.rotate(-135)
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]));
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if (label) {
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// Angle Label
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var text = new PointText(center
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+ through.normalize(radius + 10) + new Point(0, 3));
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text.content = Math.floor(vector.angle * 100) / 100 + '\xb0';
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items.push(text);
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}
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return true;
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}
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return false;
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}
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function drawLength(from, to, sign, label, value, prefix) {
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var lengthSize = 5;
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var vector = to - from;
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var awayVector = vector.normalize(lengthSize).rotate(90 * sign);
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var upVector = vector.normalize(lengthSize).rotate(45 * sign);
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var downVector = upVector.rotate(-90 * sign);
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var lengthVector = vector.normalize(
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vector.length / 2 - lengthSize * Math.sqrt(2));
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var line = new Path();
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line.add(from + awayVector);
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line.lineBy(upVector);
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line.lineBy(lengthVector);
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line.lineBy(upVector);
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var middle = line.lastSegment.point;
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line.lineBy(downVector);
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line.lineBy(lengthVector);
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line.lineBy(downVector);
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dashedItems.push(line);
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if (label) {
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// Length Label
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var textAngle = Math.abs(vector.angle) > 90
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? textAngle = 180 + vector.angle : vector.angle;
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// Label needs to move away by different amounts based on the
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// vector's quadrant:
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var away = (sign >= 0 ? [1, 4] : [2, 3]).indexOf(vector.quadrant) != -1
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? 8 : 0;
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var text = new PointText(middle + awayVector.normalize(away + lengthSize));
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text.rotate(textAngle);
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text.paragraphStyle.justification = 'center';
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value = value || vector.length;
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text.content = (prefix || '') + Math.floor(value * 1000) / 1000;
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items.push(text);
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}
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}
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////////////////////////////////////////////////////////////////////////////////
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// Mouse Handling
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var dashItem;
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function onMouseDown(event) {
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var end = vectorStart + vector;
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var create = false;
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if (event.modifiers.shift && vectorItem) {
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vectorStart = end;
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create = true;
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} else if (vector && (event.modifiers.option
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|| end && end.getDistance(event.point) < 10)) {
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create = false;
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} else {
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vectorStart = event.point;
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}
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if (create) {
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dashItem = vectorItem;
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vectorItem = null;
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}
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processVector(event, true);
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// document.redraw();
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}
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function onMouseDrag(event) {
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if (!event.modifiers.shift && values.fixLength && values.fixAngle)
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vectorStart = event.point;
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processVector(event, event.modifiers.shift);
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}
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function onMouseUp(event) {
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processVector(event, false);
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if (dashItem) {
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dashItem.dashArray = [1, 2];
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dashItem = null;
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}
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vectorPrevious = vector;
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} </script>
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</head>
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<body>
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<canvas id="canvas" resize keepalive="true"></canvas>
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</body>
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