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HTML5 Canvas - Drawing Rectangles
There are three methods that draw rectangles on the canvas −
Sr.No. | Method and Description |
---|---|
1 | fillRect(x,y,width,height) This method draws a filled rectangle. |
2 | strokeRect(x,y,width,height) This method draws a rectangular outline. |
3 | clearRect(x,y,width,height) This method clears the specified area and makes it fully transparent |
Here x and y specify the position on the canvas (relative to the origin) of the top-left corner of the rectangle and width and height are width and height of the rectangle.
Example
Following is a simple example which makes use of above mentioned methods to draw a nice rectangle.
<!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'); // Draw shapes ctx.fillRect(25,25,100,100); ctx.clearRect(45,45,60,60); ctx.strokeRect(50,50,50,50); } 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 code would draw the following rectangle −
html5_canvas.htm
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