HTML Canvas

HTML5 Canvas

What is HTML Canvas?

The HTML <canvas> component is utilized to draw designs, on the fly, by means of JavaScript. 

The <canvas> component is just a holder for illustrations. You should utilize JavaScript to really draw the illustrations. 

Canvas has a few strategies for drawing ways, boxes, circles, message, and including pictures.

Canvas Examples

Here is an example of a basic, empty canvas:

Example

<canvas id="myCanvas" width="200" height="100" style="border:1px solid #000000;">
</canvas>

Yourself Try

Draw a Line

Example

var c = document.getElementById("myCanvas");
var ctx = c.getContext("2d");
ctx.moveTo(0,0);
ctx.lineTo(200,100);
ctx.stroke();

Yourself Try

Draw a Circle

Example

var c = document.getElementById("myCanvas");
var ctx = c.getContext("2d");
ctx.beginPath();
ctx.arc(95,50,40,0,2*Math.PI);
ctx.stroke();

Yourself Try

Draw a Text

Example

var c = document.getElementById("myCanvas");
var ctx = c.getContext("2d");
ctx.font = "30px Arial";
ctx.fillText("Hello World",10,50);

Yourself Try

Stroke Text

Example

var c = document.getElementById("myCanvas");
var ctx = c.getContext("2d");
ctx.font = "30px Arial";
ctx.strokeText("Hello World",10,50);

Yourself Try

Draw Linear Gradient

Example

var c = document.getElementById("myCanvas");
var ctx = c.getContext("2d");

// Create gradientvar grd = ctx.createLinearGradient(0,0,200,0);
grd.addColorStop(0,"red");
grd.addColorStop(1,"white");

// Fill with gradientctx.fillStyle = grd;
ctx.fillRect(10,10,150,80);

Yourself Try

Draw Circular Gradient

Example

var c = document.getElementById("myCanvas");
var ctx = c.getContext("2d");

// Create gradientvar grd = ctx.createRadialGradient(75,50,5,90,60,100);
grd.addColorStop(0,"red");
grd.addColorStop(1,"white");

// Fill with gradientctx.fillStyle = grd;
ctx.fillRect(10,10,150,80);

Yourself Try