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| // Extended drawing example where we change colors on mouse click. | |
| <canvas id="myCanvas" width="400" height="400"></canvas> | |
| <script> | |
| var canvas = document.getElementById('myCanvas'); | |
| var context = canvas.getContext('2d'); | |
| // array of colors to rotate through on click | |
| var colors = [ | |
| 'red', | |
| 'blue', | |
| 'yellow', | |
| 'green', | |
| 'purple', | |
| 'white' | |
| ]; | |
| // which color are we on? | |
| var colorIndex = 0; | |
| // only run this function when the mouse button goes down | |
| canvas.addEventListener('mousedown', function() { | |
| // go to the next color | |
| colorIndex++; | |
| // have we gone past the end of the array? if yes, start over | |
| if (colorIndex >= colors.length) { | |
| colorIndex = 0; | |
| } | |
| }); | |
| canvas.addEventListener('mousemove', function(event) { | |
| // set the fill style to our current color | |
| context.fillStyle = colors[colorIndex]; | |
| context.fillRect(event.x, event.y, 10, 10); | |
| }); | |
| </script> |
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