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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