Created
April 23, 2015 03:22
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circa 2012
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <title>polygons</title> | |
| <script type="text/javascript"> | |
| var amount; | |
| var size; | |
| var X; | |
| var Y; | |
| window.onload = draw; | |
| function draw() { | |
| var canvas = document.getElementById('myCanvas'); | |
| canvas.width = canvas.width; //this clears previous shape | |
| if (canvas.getContext) { | |
| var myShape = canvas.getContext('2d'); | |
| amount = document.getElementById('inputAmount').value; | |
| size = document.getElementById('inputSize').value; | |
| myShape.beginPath(); | |
| for (var i=1;i<=amount;i++) { | |
| X = Math.cos(i*2*Math.PI/amount)*size+150; | |
| Y = Math.sin(i*2*Math.PI/amount)*size+50; | |
| if (i==1) { | |
| myShape.moveTo(X,Y); | |
| } else { | |
| myShape.lineTo(X,Y); | |
| } | |
| } | |
| myShape.fill(); | |
| } | |
| } | |
| </script> | |
| </head> | |
| <body> | |
| <canvas id="myCanvas" width="500" height="200"> | |
| Update your browser to a current one. | |
| </canvas> | |
| <br> | |
| Amount:<input type="text" id="inputAmount" value="4" onchange="draw()"> | |
| Size:<input type="text" id="inputSize" value="40" onchange="draw()"> | |
| </body> | |
| </html> |
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