Initial Stage Editor Commit

Co-Authored-By: ⍚~Nex <87421482+NexIsDumb@users.noreply.github.com>

source/funkin/backend/utils/MatrixUtil.hx

@@ -0,0 +1,33 @@
+package funkin.backend.utils;
+
+import flixel.FlxCamera;
+import flixel.math.FlxPoint;
+import flixel.util.typeLimit.OneOfTwo;
+
+class MatrixUtil {
+	public static function getMatrixPosition(sprite:FlxSprite, points:OneOfTwo<FlxPoint, Array<FlxPoint>>, ?camera:FlxCamera, _width:Float = 1, _height:Float = 1):Array<FlxPoint>
+	{
+		//if(_width == -1) _width = sprite.width;
+		//if(_height == -1) _height = sprite.height;
+		if(camera == null) camera = sprite.camera;
+		if(points is FlxBasePoint) points = [points];
+		var nc = funkin.backend.system.NothingCamera.instance;
+		nc.scroll.set(camera.scroll.x, camera.scroll.y);
+		//nc.zoom = camera.zoom; // might not be needed
+		nc.pixelPerfectRender = camera.pixelPerfectRender;
+		@:privateAccess sprite.drawComplex(nc);
+
+		var points:Array<FlxPoint> = cast points;
+		@:privateAccess for(point in points) {
+			var x = sprite._matrix.__transformX(point.x * _width, point.y * _height);
+			var y = sprite._matrix.__transformY(point.x * _width, point.y * _height);
+
+			// reset to ingame coords
+			x += camera.scroll.x;
+			y += camera.scroll.y;
+
+			point.set(x, y);
+		}
+		return points;
+	}
+}