piskel/js/rendering/SpritesheetRenderer.js

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(function () {
var ns = $.namespace("pskl.rendering");
ns.SpritesheetRenderer = function (framesheet) {
this.framesheet = framesheet;
};
ns.SpritesheetRenderer.prototype.renderAsImageDataSpritesheetPNG = function () {
var canvas = this.createCanvas_();
for (var i = 0 ; i < this.framesheet.getFrameCount() ; i++) {
var frame = this.framesheet.getFrameByIndex(i);
this.drawFrameInCanvas_(frame, canvas, i * this.framesheet.getWidth(), 0);
}
return canvas.toDataURL("image/png");
};
ns.SpritesheetRenderer.prototype.blobToBase64_ = function(blob, cb) {
var reader = new FileReader();
reader.onload = function() {
var dataUrl = reader.result;
cb(dataUrl);
};
reader.readAsDataURL(blob);
};
ns.SpritesheetRenderer.prototype.renderAsImageDataAnimatedGIF = function(fps, cb) {
var dpi = 10;
var gif = new window.GIF({
workers: 2,
quality: 10,
width: 320,
height: 320
});
for (var i = 0; i < this.framesheet.frames.length; i++) {
var frame = this.framesheet.frames[i];
var renderer = new pskl.rendering.CanvasRenderer(frame, dpi);
gif.addFrame(renderer.render(), {
delay: 1000 / fps
});
}
gif.on('finished', function(blob) {
this.blobToBase64_(blob, cb);
}.bind(this));
gif.render();
};
/**
* TODO(juliandescottes): Mutualize with code already present in FrameRenderer
*/
ns.SpritesheetRenderer.prototype.drawFrameInCanvas_ = function (frame, canvas, offsetWidth, offsetHeight) {
var context = canvas.getContext('2d');
for(var col = 0, width = frame.getWidth(); col < width; col++) {
for(var row = 0, height = frame.getHeight(); row < height; row++) {
var color = frame.getPixel(col, row);
if(color != Constants.TRANSPARENT_COLOR) {
context.fillStyle = color;
context.fillRect(col + offsetWidth, row + offsetHeight, 1, 1);
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}
}
}
};
ns.SpritesheetRenderer.prototype.createCanvas_ = function () {
var frameCount = this.framesheet.getFrameCount();
if (frameCount > 0){
var width = frameCount * this.framesheet.getWidth();
var height = this.framesheet.getHeight();
return pskl.CanvasUtils.createCanvas(width, height);
} else {
throw "Cannot render empty Spritesheet";
}
};
})();