Canvas Image Patterns: HTML5

Today lets learn how to create patterns on canvas using image.

index.html and myStyle.css files are kept same as illustrated in previous video tutorial: Canvas State: HTML5

Related Topics:
Canvas Basics: HTML5
Draw Rectangle: HTML5 Canvas

Javascript file
myScript.js

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window.onload = canvas;
 
function canvas()
{
var myCanvas = document.getElementById("myCanvas");
 
if( myCanvas && myCanvas.getContext("2d") ) 
{
var context         = myCanvas.getContext("2d");
 
var myImg           = new Image();
myImg.src           = "technotip.png";
 
myImg.onload        = function() {
  context.fillStyle = context.createPattern(myImg, "no-repeat");
  context.fillRect(0, 0, context.canvas.width, context.canvas.height);
}
 
}
}

Here we create a new image object myImg and set it’s source to a image technotip.png Once the object loads the source image we call an anonymous function. Here we set fillStyle property with the pattern we create out of the image. createPattern takes 2 parameter, first on being the pattern itself and the second one being the image repeat value, it takes repeat, no-repeat, repeat-x or repeat-y as it’s value.

Canvas Image Patterns: HTML5

Note:
We can create pattern out of another canvas element or an image or even a video file.