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Last change
on this file since 28914 was 28914, checked in by ak19, 10 years ago |
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Supporting javascript libraries and bespoke code written by Steffan to support the von-sparql user interface
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File size:
1.7 KB
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| 1 | <!DOCTYPE html>
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| 2 | <html>
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| 3 | <head>
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| 4 | <meta charset="UTF-8">
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| 5 | <title>Dripping Brush</title>
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| 6 | <link rel="stylesheet" href="../css/style.css">
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| 7 | <script type="text/javascript" src="../../dist/paper.js"></script>
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| 8 | <script type="text/paperscript" canvas="canvas">
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| 9 | var path;
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| 10 | var minSize = 5;
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| 11 | tool.maxDistance = 20;
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| 12 | function onMouseDrag(event) {
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| 13 | // If the user dragged more then minSize:
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| 14 | if (event.delta.length > minSize) {
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| 15 | // If there is no path, make one:
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| 16 | if (!path) {
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| 17 | path = new Path({
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| 18 | fillColor: 'black'
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| 19 | });
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| 20 | path.add(event.lastPoint);
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| 21 | }
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| 22 |
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| 23 | var step = event.delta / 2;
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| 24 | step.angle = step.angle + 90;
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| 25 |
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| 26 | // The top point: the middle point + the step rotated by 90 degrees:
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| 27 | // -----*
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| 28 | // |
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| 29 | // ------
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| 30 | var top = event.middlePoint + step;
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| 31 |
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| 32 | // The bottom point: the middle point - the step rotated by 90 degrees:
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| 33 | // ------
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| 34 | // |
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| 35 | // -----*
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| 36 | var bottom = event.middlePoint - step;
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| 37 |
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| 38 | path.add(top);
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| 39 | path.insert(0, bottom);
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| 40 | path.smooth();
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| 41 | } else {
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| 42 | // If the user dragged too slowly:
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| 43 |
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| 44 | // If there is currently a path, close it
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| 45 | if (path) {
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| 46 | path.add(event.point);
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| 47 | path.closed = true;
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| 48 | path.smooth();
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| 49 |
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| 50 | // Set path to null (nothing) so the path check above
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| 51 | // will force a new path next time the user drags fast enough:
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| 52 | path = null;
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| 53 | }
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| 54 | }
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| 55 | }
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| 56 |
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| 57 | function onMouseUp(event) {
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| 58 | if (path) {
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| 59 | path.add(event.point);
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| 60 | path.closed = true;
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| 61 | path.smooth();
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| 62 |
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| 63 | // Set path to null (nothing) so the path check above
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| 64 | // will force a new path next time the user drags fast enough:
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| 65 | path = null;
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| 66 | }
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| 67 | }
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| 68 | </script>
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| 69 | </head>
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| 70 | <body>
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| 71 | <canvas id="canvas" resize></canvas>
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| 72 | </body>
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| 73 | </html> |
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