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BitmapData.alphaMask will draw the given image onto a BitmapData using an image as an alpha mask.

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photonstorm
2014-02-21 15:09:04 +00:00
parent 07af06fc4e
commit d7ababa398
4 changed files with 124 additions and 34 deletions
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src/gameobjects/BitmapData.js
+55 -9
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@@ -278,31 +278,77 @@ Phaser.BitmapData.prototype = {
/**
* Copies the pixels from the source image to this BitmapData based on the given area and destination.
*
* @param {HTMLImage} source - The Image to copy from. If you want to use an image in Phasers Cache, use game.cache.getImage(key).
* @param {HTMLImage|string} source - The Image to draw. If you give a key it will try and find the Image in the Game.Cache.
* @param {Phaser.Rectangle} area - The Rectangle region to copy from the source image.
* @param {number} destX - The destination x coordinate to copy the image to.
* @param {number} destY - The destination y coordinate to copy the image to.
*/
copyPixels: function (source, area, destX, destY) {
this.context.drawImage(source, area.x, area.y, area.width, area.height, destX, destY, area.width, area.height);
if (typeof source === 'string')
{
source = this.game.cache.getImage(source);
}
if (source)
{
this.context.drawImage(source, area.x, area.y, area.width, area.height, destX, destY, area.width, area.height);
}
},
/**
* Alpha mask.
* Draws the given image to this BitmapData at the coordinates specified. If you need to only draw a part of the image use BitmapData.copyPixels instead.
*
* @param {HTMLImage} source - The Image to copy from. If you want to use an image in Phasers Cache, use game.cache.getImage(key).
* @param {Phaser.Rectangle} area - The Rectangle region to copy from the source image.
* @param {number} destX - The destination x coordinate to copy the image to.
* @param {number} destY - The destination y coordinate to copy the image to.
* @param {HTMLImage|string} source - The Image to draw. If you give a key it will try and find the Image in the Game.Cache.
* @param {number} destX - The destination x coordinate to draw the image to.
* @param {number} destY - The destination y coordinate to draw the image to.
*/
alphaMask: function (source) {
draw: function (source, destX, destY) {
if (typeof source === 'string')
{
source = this.game.cache.getImage(source);
}
if (source)
{
this.context.drawImage(source, 0, 0, source.width, source.height, destX, destY, source.width, source.height);
}
},
/**
* Draws the given image onto this BitmapData using an image as an alpha mask.
*
* @param {HTMLImage|string} source - The Image to draw. If you give a key it will try and find the Image in the Game.Cache.
* @param {HTMLImage|string} mask - The Image to use as the alpha mask. If you give a key it will try and find the Image in the Game.Cache.
*/
alphaMask: function (source, mask) {
var temp = this.context.globalCompositeOperation;
if (typeof mask === 'string')
{
mask = this.game.cache.getImage(mask);
}
if (mask)
{
this.context.drawImage(mask, 0, 0);
}
this.context.globalCompositeOperation = 'source-atop';
// this.context.drawImage(source, area.x, area.y, area.width, area.height, destX, destY, area.width, area.height);
if (typeof source === 'string')
{
source = this.game.cache.getImage(source);
}
if (source)
{
this.context.drawImage(source, 0, 0);
}
this.context.globalCompositeOperation = temp;