HTML5 Canvas
What is Canvas?
Canvas is a medium for oil painting. One of the earliest oils on canvas is a French Madonna from 1410.
Canvas is typically stretched across a wooden frame.
On the HTML canvas, you can draw all kinds of graphics, from simple lines, to
complex graphic objects.
The HTML <canvas> Element
The HTML <canvas> element (introduced in HTML5) is a container for
canvas graphics.
An HTML canvas is a rectangular area on an HTML page.
Canvas has several methods for drawing paths, boxes, circles, text, and
graphic images.
Canvas Examples
Basic Canvas Example
<canvas id="myCanvas" width="200" height="100"
style="border:1px solid
#000000;">
</canvas>
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Drawing with JavaScript
<script>
var c = document.getElementById("myCanvas");
var ctx = c.getContext("2d");
ctx.fillStyle = "#FF0000";
ctx.fillRect(0,0,150,75);
</script>
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Draw a Line
var c = document.getElementById("myCanvas");
var ctx = c.getContext("2d");
ctx.moveTo(0,0);
ctx.lineTo(200,100);
ctx.stroke();
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Draw a Circle
var c = document.getElementById("myCanvas");
var ctx = c.getContext("2d");
ctx.beginPath();
ctx.arc(95,50,40,0,2*Math.PI);
ctx.stroke();
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Draw a Text
var c = document.getElementById("myCanvas");
var ctx = c.getContext("2d");
ctx.font = "30px Arial";
ctx.fillText("Hello World",10,50);
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Stroke Text
var c = document.getElementById("myCanvas");
var ctx = c.getContext("2d");
ctx.font = "30px Arial";
ctx.strokeText("Hello World",10,50);
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Draw Gradient
var c = document.getElementById("myCanvas");
var ctx = c.getContext("2d");
// Create gradient
var grd = ctx.createLinearGradient(0,0,200,0);
grd.addColorStop(0,"red");
grd.addColorStop(1,"white");
// Fill with gradient
ctx.fillStyle = grd;
ctx.fillRect(10,10,150,80);
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Draw Circular Gradient
var c = document.getElementById("myCanvas");
var ctx = c.getContext("2d");
// Create gradient
var grd = ctx.createRadialGradient(75,50,5,90,60,100);
grd.addColorStop(0,"red");
grd.addColorStop(1,"white");
// Fill with gradient
ctx.arc(50, 50, 50, 0, 2*Math.PI);
ctx.fillStyle = grd;
ctx.fill();
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Draw Image
var c = document.getElementById("myCanvas");
var ctx = c.getContext("2d");
var img = document.getElementById("scream");
ctx.drawImage(img,10,10);
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HTML Canvas Tutorial
To learn all about HTML <canvas>, Visit our full
Canvas Tutorial.
Color Picker
