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C # tutorial
Draw a red rectangle on the fly, and show it inside the <canvas> element
The <canvas>
tag is used to draw graphics, on the fly, via scripting (usually JavaScript).
The <canvas>
tag is transparent, and
is only a container for graphics, you must use a script to actually draw the graphics.
Any text inside the <canvas>
element will be displayed in browsers
with JavaScript disabled and in browsers that do not support <canvas>
.
<canvas>
element in our
HTML Canvas Tutorial.
The numbers in the table specify the first browser version that fully supports the element.
Element | |||||
---|---|---|---|---|---|
<canvas> | 4.0 | 9.0 | 2.0 | 3.1 | 9.0 |
Attribute | Value | Description |
---|---|---|
height | pixels | Specifies the height of the canvas. Default value is 150 |
width | pixels | Specifies the width of the canvas Default value is 300 |
The <canvas>
tag also supports the Global Attributes in HTML.
The <canvas>
tag also supports the Event Attributes in HTML.
Another <canvas> example:
<canvas id="myCanvas">
Your browser does not
support the canvas tag.
</canvas>
<script>
var c = document.getElementById("myCanvas");
var ctx = c.getContext("2d");
ctx.fillStyle = "red";
ctx.fillRect(20,
20, 75, 50);
//Turn transparency on
ctx.globalAlpha = 0.2;
ctx.fillStyle = "blue";
ctx.fillRect(50, 50, 75, 50);
ctx.fillStyle
= "green";
ctx.fillRect(80, 80, 75, 50);
</script>
Most browsers will display the <canvas>
element with the following default values:
canvas {
height: 150px;
width: 300px;
}