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Sketchpad.js - Centering on Canvas
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <html> | |
| <head> | |
| <link rel="stylesheet" type="text/css" href="styles.css"> | |
| </head> | |
| <body> | |
| <div id="sketchpadDiv"> | |
| <canvas id="sketchpadCanvas"></canvas> | |
| </div> | |
| </body> | |
| <script type="text/javascript" src="https://code.jquery.com/jquery-2.1.1.min.js"></script> | |
| <script type="text/javascript" src="http://www.garciadelcastillo.es/sketchpad/sketchpad.js"></script> | |
| <script type="text/javascript" src="sketch.js"></script> | |
| </html> |
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| // Create new instance of Sketchpad in target Canvas | |
| var pad = new Sketchpad('sketchpadCanvas'); | |
| // .width and .height properties are accessible as Measures to inherit from | |
| var label = pad.Label.compose(pad.width, pad.height, function() { | |
| return 'Canvas dimensions: ' + pad.width.value + 'x' + pad.height.value + ' px'; | |
| }); | |
| // Compose half Measures and attach a Circle on Canvas center | |
| var halfWidth = pad.Measure.compose(pad.width, function () { | |
| return pad.width.value / 2; | |
| }), | |
| halfHeight = pad.Measure.compose(pad.height, function() { | |
| return pad.height.value / 2; | |
| }); | |
| var C = pad.Point.fromMeasures(halfWidth, halfHeight), | |
| circle = pad.Circle.centerRadius(C, 101); | |
| // Display dimension on the center | |
| var tag = pad.Tag.on(C, label); |
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| body { | |
| margin: 0; | |
| padding: 0; | |
| } | |
| #sketchpadDiv { | |
| position: absolute; | |
| width: 100%; | |
| height: 100%; | |
| border: 1px solid #000; | |
| -webkit-box-sizing: border-box; | |
| -moz-box-sizing: border-box; | |
| box-sizing: border-box; | |
| } | |
| #sketchpadCanvas { | |
| position: absolute; | |
| } |
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