..
function BROWSER( attrs, body ) { <DIV> { attrs ...} }
In this example, we are going to create a simple image filter. We will map the colors of a given remote image to a set of three colors.
When an image is displayed in a canvas JavaScript lets programs access the data of the displayed images and it also lets programs create dynamically new images. There is, however, one restriction, the image must be located on same the server as the one that delivers the program.
srcand
dst.
source. This can be done with an expression such as:
var src = document.getElementById( 'src' ); var ctx = src.getContext( '2d' ); var img = new Image(); // add a listener called when the image is loaded img.onload = function( e ) { // resize the canvas to fix the image actual dimension src.width = img.width; src.height = img.height; // draw the image the canvas ctx.drawImage( img, 0, ); } // start downloading the url img.src = url;
ctx1.getImageData( 0, 0, img.width img.height )
This returns a struct with two fields:ctx2.putImageData(copyImageArray( ctx1))