57 lines
1.1 KiB
Haxe
57 lines
1.1 KiB
Haxe
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package lib.ui;
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import kernel.ui.Pixel;
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import lib.ui.Canvas;
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/**
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Layer multiple canvases and compress them into one from a top down view.
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**/
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class CanvasStack {
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private var layers:Array<{c:Canvas, offset:Pos}> = [];
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private var width:Int = 0;
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private var hight:Int = 0;
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public function new() {}
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public function addLayer(c:Canvas, offset:Pos) {
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this.layers.push({c: c, offset: offset});
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var layerWidth = c.maxWidth() + offset.x;
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var layerHight = c.height() + offset.y;
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if (layerWidth > this.width) {
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this.width = layerWidth;
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}
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if (layerHight > this.hight) {
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this.hight = layerHight;
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}
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}
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public function compress():Canvas {
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var rtn = new Canvas();
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for (y in 0...this.hight) {
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for (x in 0...this.width) {
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var pos = new Pos({x: x, y: y});
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rtn.set(pos, this.pixelAt(pos));
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}
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}
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return rtn;
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}
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public function pixelAt(pos:Pos):Null<Pixel> {
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for (i in 0...this.layers.length) {
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var newi = (this.layers.length - 1) - i;
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var offset = this.layers[newi].offset;
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var px = this.layers[newi].c.get(pos - offset);
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if (px != null) {
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return px;
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}
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}
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return null;
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}
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}
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