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Sketchpad.js - Labels and Tags
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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'); | |
| // Render a fixed text Tag on XY position | |
| var title = new pad.Tag('This is a fixed Tag', 320, 40); | |
| // Create a text Label linked to Node P | |
| // Note how Label.compose takes as arguments all the elements | |
| // the Label is child to, plus a callback function | |
| // returning the Label text string | |
| var P = new pad.Node(320, 200); | |
| var posLabel = pad.Label.compose(P, function() { | |
| return '[' + Math.round(P.x) + ', ' + Math.round(P.y) + ']'; | |
| }); | |
| // Now render a text Tag on Node P with text Label | |
| var positionTag = pad.Tag.on(P, posLabel); | |
| // Similarly, display Node distance to [0, 0] | |
| var distLabel = pad.Label.compose(P, function() { | |
| var d = Math.sqrt(P.x * P.x + P.y * P.y); | |
| return 'This is a dynamic Tag. D = ' + Math.round(d) + ' px'; | |
| }); | |
| var anchor = new pad.Point(320, 375), | |
| distTag = pad.Tag.on(anchor, distLabel); | |
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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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