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HTML5 Canvas - Styles and Colors
HTML5 canvas provides following two important properties to apply colors to a shape:
SN | 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 above mentioned fillStyle attribute to create a nice pattern.
<!DOCTYPE HTML>
<html>
<head>
<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 onload="drawShape();">
<canvas id="mycanvas"></canvas>
</body>
</html>
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The above example would produce following result
To learn above concept - Do Online Practice using latest version of either Safari or Opera.
A strokeStyle Example:
Following is a simple example which makes use of above mentioned fillStyle attribute to create another nice pattern.
<!DOCTYPE HTML>
<html>
<head>
<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 onload="drawShape();">
<canvas id="mycanvas"></canvas>
</body>
</html>
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The above example would produce following result
To learn above concept - Do Online Practice using latest version of either Safari or Opera.
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