initial commit

src/lib/ui/Canvas.hx

@@ -0,0 +1,74 @@
+package lib.ui;
+
+import util.Vec.Vec2;
+import kernel.ui.TermBuffer.Pixel;
+
+abstract Canvas(Array<Array<Pixel>>) to Array<Array<Pixel>> {
+	inline public function new() {
+		this = [[]];
+	}
+
+	public inline function set(i:Vec2<Int>,pixel:Pixel) {
+		if (this[i.y] == null){
+			this[i.y] = [];
+		}
+
+		this[i.y][i.x] = pixel;
+	}
+
+	public inline function get(i:Vec2<Int>): Pixel {
+		return this[i.y][i.x];
+	}
+
+	public function keyValueIterator(): KeyValueIterator<Vec2<Int>,Pixel>{
+		return new CanvasKeyValueIterator(this);
+	}
+
+	public function combine(other: Canvas,offset: Vec2<Int>) {
+		for (key => value in other) {
+			if (value == null){
+				continue;
+			}
+
+			var y = offset.y + key.y;
+			var x = offset.x + key.x;
+			
+			if (this[y] == null){
+				this[y] = [];
+			}
+
+			this[y][x] = value;
+		}
+	}
+}
+
+class CanvasKeyValueIterator{
+	private final canvas:Array<Array<Pixel>>;
+	private var index:Vec2<Int> = {x: 0,y: 0};
+
+	@:allow(lib.ui.Canvas)
+	private function new(canvas: Array<Array<Pixel>>) {
+		this.canvas = canvas;
+	}
+
+	public function hasNext():Bool{
+		return index.y < canvas.length && index.x < canvas[index.y].length;
+	}
+
+	public function next():{key:Vec2<Int>, value:Pixel}{
+		var oldIndex: Vec2<Int> = this.index;
+
+		if (index.x >= canvas[index.y].length){
+			// Goto next line
+			index = {x:0,y: index.y + 1};
+		}else{
+			// Goto next pixel in line
+			index = {x:index.x + 1,y: index.y};
+		}
+
+		return {
+			key: oldIndex,
+			value: this.canvas[oldIndex.y][oldIndex.x]
+		};
+	}
+}