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HTML5 Canvas - Styles and Colors
HTML5 canvas provides the following two important properties to apply colors to a shape −
Sr.No. | Method and Description |
---|---|
1 | fillStyle This attribute represents the color or style to use inside the shapes. |
2 | strokeStyle This attribute represents the color or style to use for the lines around shapes. |
By default, the stroke and fill color are set to black which is CSS color value #000000.
A fillStyle Example
Following is a simple example which makes use of the above-mentioned fillStyle attribute to create a nice pattern.
<!DOCTYPE HTML> <html> <head> <style> #test { width: 100px; height:100px; margin: 0px auto; } </style> <script type = "text/javascript"> function drawShape() { // get the canvas element using the DOM var canvas = document.getElementById('mycanvas'); // Make sure we don't execute when canvas isn't supported if (canvas.getContext) { // use getContext to use the canvas for drawing var ctx = canvas.getContext('2d'); // Create a pattern for (var i = 0;i<7;i++) { for (var j = 0;j<7;j++) { ctx.fillStyle = 'rgb(' + Math.floor(255-20.5*i)+ ','+ Math.floor(255 - 42.5*j) + ',255)'; ctx.fillRect( j*25, i* 25, 55, 55 ); } } } else { alert('You need Safari or Firefox 1.5+ to see this demo.'); } } </script> </head> <body id = "test" onload = "drawShape();"> <canvas id = "mycanvas"></canvas> </body> </html>
The above example would produce the following result −
A strokeStyle Example
Following is a simple example which makes use of the above-mentioned fillStyle attribute to create another nice pattern.
<!DOCTYPE HTML> <html> <head> <style> #test { width: 100px; height:100px; margin: 0px auto; } </style> <script type = "text/javascript"> function drawShape() { // get the canvas element using the DOM var canvas = document.getElementById('mycanvas'); // Make sure we don't execute when canvas isn't supported if (canvas.getContext) { // use getContext to use the canvas for drawing var ctx = canvas.getContext('2d'); // Create a pattern for (var i = 0;i<10;i++) { for (var j = 0;j<10;j++) { ctx.strokeStyle = 'rgb(255,'+ Math.floor(50-2.5*i)+','+ Math.floor(155 - 22.5 * j ) + ')'; ctx.beginPath(); ctx.arc(1.5+j*25, 1.5 + i*25,10,10,Math.PI*5.5, true); ctx.stroke(); } } } else { alert('You need Safari or Firefox 1.5+ to see this demo.'); } } </script> </head> <body id = "test" onload = "drawShape();"> <canvas id = "mycanvas"></canvas> </body> </html>
The above example would produce the following result −
html5_canvas.htm
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