canvas
NOTE: This new element is HTML5 and will be a standardized element in 2014.
The <canvas> tag is aptly named. It supplies us with a means of drawing things through script and it renders in a browser. Much the same way one would use Actionscript to animate the Flash stage. Things can be stationary or animated inside of a canvas tag. We use Javascript to draw what we want in the canvas and animate those things. Interaction and Event listeners can also be applied to canvas elements using Javascript.
HTML CODE EXAMPLE
<!DOCTYPE html>
<html>
<head>
<script type="application/javascript" language="javascript">
window.onload = draw; // Execute draw function when DOM is ready
function draw() {
// Assign our canvas element to a variable
var canvas = document.getElementById("canvas1");
// Create the HTML5 context object to enable draw methods
var ctx = canvas.getContext("2d");
// Draw Filled Shape 1 (center triangle of logo)
ctx.beginPath();
ctx.moveTo(100, 50);
ctx.lineTo(130, 100);
ctx.lineTo(70, 100);
ctx.fillStyle = "rgba(0,0,0,1)";
ctx.fill();
// Draw Filled Shape 2 (left flap of logo)
ctx.beginPath();
ctx.moveTo(72, 60);
ctx.lineTo(85, 72);
ctx.lineTo(71, 94);
ctx.lineTo(50, 70);
ctx.lineTo(65, 40);
ctx.fillStyle = "rgba(0,0,0,1)";
ctx.fill();
// Your homework is to Draw Filled Shape 3 here (right flap)
// to complete the shape of the WorldOfWebcraft.com logo
}
</script>
</head>
<body>
<canvas id="canvas1" width="400" height="300">Fallback Content</canvas>
</body>
</html>:
<html>
<head>
<script type="application/javascript" language="javascript">
window.onload = draw; // Execute draw function when DOM is ready
function draw() {
// Assign our canvas element to a variable
var canvas = document.getElementById("canvas1");
// Create the HTML5 context object to enable draw methods
var ctx = canvas.getContext("2d");
// Draw Filled Shape 1 (center triangle of logo)
ctx.beginPath();
ctx.moveTo(100, 50);
ctx.lineTo(130, 100);
ctx.lineTo(70, 100);
ctx.fillStyle = "rgba(0,0,0,1)";
ctx.fill();
// Draw Filled Shape 2 (left flap of logo)
ctx.beginPath();
ctx.moveTo(72, 60);
ctx.lineTo(85, 72);
ctx.lineTo(71, 94);
ctx.lineTo(50, 70);
ctx.lineTo(65, 40);
ctx.fillStyle = "rgba(0,0,0,1)";
ctx.fill();
// Your homework is to Draw Filled Shape 3 here (right flap)
// to complete the shape of the WorldOfWebcraft.com logo
}
</script>
</head>
<body>
<canvas id="canvas1" width="400" height="300">Fallback Content</canvas>
</body>
</html>:
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