piskel/js/rendering/CanvasRenderer.js

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2013-04-07 22:16:47 +04:00
(function () {
var ns = $.namespace("pskl.rendering");
ns.CanvasRenderer = function (frame, dpi) {
this.frame = frame;
this.dpi = dpi;
this.transparentColor_ = 'white';
};
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/**
* Decide which color should be used to represent transparent pixels
* Default : white
* @param {String} color the color to use either as '#ABCDEF' or 'red' or 'rgb(x,y,z)' or 'rgba(x,y,z,a)'
*/
ns.CanvasRenderer.prototype.drawTransparentAs = function (color) {
this.transparentColor_ = color;
};
ns.CanvasRenderer.prototype.render = function () {
var canvas = this.createCanvas_();
var context = canvas.getContext('2d');
for(var col = 0, width = this.frame.getWidth(); col < width; col++) {
for(var row = 0, height = this.frame.getHeight(); row < height; row++) {
var color = this.frame.getPixel(col, row);
this.renderPixel_(color, col, row, context);
}
}
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return context;
};
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ns.CanvasRenderer.prototype.renderPixel_ = function (color, col, row, context) {
if(color == Constants.TRANSPARENT_COLOR) {
color = this.transparentColor_;
}
context.fillStyle = color;
context.fillRect(col * this.dpi, row * this.dpi, this.dpi, this.dpi);
};
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ns.CanvasRenderer.prototype.createCanvas_ = function () {
var width = this.frame.getWidth() * this.dpi;
var height = this.frame.getHeight() * this.dpi;
return pskl.CanvasUtils.createCanvas(width, height);
};
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})();