piskel/js/model/Frame.js

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(function () {
var ns = $.namespace("pskl.model");
ns.Frame = function (pixels) {
this.pixels = pixels;
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this.previousStates = [this.getPixels()];
this.stateIndex = 0;
};
ns.Frame.createEmpty = function (width, height) {
var pixels = []; //new Array(width);
for (var columnIndex=0; columnIndex < width; columnIndex++) {
var columnArray = [];
for(var heightIndex = 0; heightIndex < height; heightIndex++) {
columnArray.push(Constants.TRANSPARENT_COLOR);
}
pixels[columnIndex] = columnArray;
}
return new ns.Frame(pixels);
};
ns.Frame.createEmptyFromFrame = function (frame) {
return ns.Frame.createEmpty(frame.getWidth(), frame.getHeight());
};
ns.Frame.prototype.clone = function () {
return new ns.Frame(this._clonePixels());
};
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/**
* Returns a copy of the pixels used by the frame
*/
ns.Frame.prototype.getPixels = function () {
return this.clonePixels_(this.pixels)
};
/**
* Copies the passed pixels into the frame.
*/
ns.Frame.prototype.setPixels = function (pixels) {
this.pixels = this.clonePixels_(pixels);
};
/**
* Clone a set of pixels. Should be static utility method
* @private
*/
ns.Frame.prototype.clonePixels_ = function (pixels) {
var clonedPixels = [];
for (var col = 0 ; col < pixels.length ; col++) {
clonedPixels[col] = pixels[col].slice(0 , this.getHeight());
}
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return clonedPixels;
};
ns.Frame.prototype.serialize = function () {
return JSON.stringify(this.pixels);
};
ns.Frame.prototype.setPixel = function (col, row, color) {
this.pixels[col][row] = color;
};
ns.Frame.prototype.getPixel = function (col, row) {
return this.pixels[col][row];
};
ns.Frame.prototype.getWidth = function () {
return this.pixels.length;
};
ns.Frame.prototype.getHeight = function () {
return this.pixels[0].length;
};
ns.Frame.prototype.containsPixel = function (col, row) {
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return col >= 0 && row >= 0 && col < this.pixels.length && row < this.pixels[0].length;
};
ns.Frame.prototype.saveState = function () {
// remove all states past current state
this.previousStates.length = this.stateIndex + 1;
// push new state
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this.previousStates.push(this.getPixels());
// set the stateIndex to latest saved state
this.stateIndex = this.previousStates.length - 1;
};
ns.Frame.prototype.loadPreviousState = function () {
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if (this.stateIndex > 0) {
this.stateIndex--;
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this.setPixels(this.previousStates[this.stateIndex]);
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}
};
ns.Frame.prototype.loadNextState = function () {
if (this.stateIndex < this.previousStates.length - 1) {
this.stateIndex++;
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this.setPixels(this.previousStates[this.stateIndex]);
}
};
})();