Implement FlxSprite.skew

flixel/FlxSprite.hx

@@ -251,6 +251,13 @@ class FlxSprite extends FlxObject
 	 */
 	public var scale(default, null):FlxPoint;
 
+	/**
+	 * An `FlxMatrix` that is concatenated to the internal matrix.
+	 * Use this if you want to make unique changes to the rendering of `this` sprite.
+	 * @since 5.9.0
+	 */
+	public var transform(default, null):FlxMatrix;
+
 	/**
 	 * Blending modes, just like Photoshop or whatever, e.g. "multiply", "screen", etc.
 	 */
@@ -393,6 +400,7 @@ class FlxSprite extends FlxObject
 		offset = FlxPoint.get();
 		origin = FlxPoint.get();
 		scale = FlxPoint.get(1, 1);
+		transform = new FlxMatrix();
 		_halfSize = FlxPoint.get();
 		_matrix = new FlxMatrix();
 		colorTransform = new ColorTransform();
@@ -418,6 +426,7 @@ class FlxSprite extends FlxObject
 		offset = FlxDestroyUtil.put(offset);
 		origin = FlxDestroyUtil.put(origin);
 		scale = FlxDestroyUtil.put(scale);
+		transform = null;
 		_halfSize = FlxDestroyUtil.put(_halfSize);
 		_scaledOrigin = FlxDestroyUtil.put(_scaledOrigin);
 
@@ -856,6 +865,8 @@ class FlxSprite extends FlxObject
 				_matrix.rotateWithTrig(_cosAngle, _sinAngle);
 		}
 
+		_matrix.concat(transform);
+
 		getScreenPosition(_point, camera).subtractPoint(offset);
 		_point.add(origin.x, origin.y);
 		_matrix.translate(_point.x, _point.y);
@@ -1285,7 +1296,7 @@ class FlxSprite extends FlxObject
 		if (FlxG.renderTile)
 			return false;
 
-		return isSimpleRenderBlit(camera);
+		return isSimpleRenderBlit(camera) && transform.isIdentity();
 	}
 
 	/**
@@ -1704,6 +1715,7 @@ interface IFlxSprite extends IFlxBasic
 	var offset(default, null):FlxPoint;
 	var origin(default, null):FlxPoint;
 	var scale(default, null):FlxPoint;
+	var transform(default, null):FlxMatrix;
 	var velocity(default, null):FlxPoint;
 	var maxVelocity(default, null):FlxPoint;
 	var acceleration(default, null):FlxPoint;

flixel/math/FlxMatrix.hx

@@ -9,6 +9,37 @@ import openfl.geom.Matrix;
  */
 class FlxMatrix extends Matrix
 {
+	public inline function isIdentity():Bool
+	{
+		return a == 1 && b == 0 && c == 0 && d == 1 && tx == 0 && ty == 0;
+	}
+
+	/**
+	 * Skews `this` matrix, in radians.
+	 * @param	skewX	Horizontal skew in radians.
+	 * @param	skewY	Vertical skew in radians.
+	 * @return	`this` skewed matrix.
+	 */
+	public inline function skewRadians(skewX:Float, skewY:Float):FlxMatrix
+	{
+		b = Math.tan(skewY);
+
+		c = Math.tan(skewX);
+
+		return this;
+	}
+
+	/**
+	 * Skews `this` matrix, in degrees.
+	 * @param	skewY	Horizontal skew in degrees.
+	 * @param	skewX	Vertical skew in degrees.
+	 * @return	`this` skewed matrix.
+	 */
+	public inline function skewDegrees(skewX:Float, skewY:Float):FlxMatrix
+	{
+		return skewRadians(skewY * FlxAngle.TO_RAD, skewX * FlxAngle.TO_RAD);
+	}
+
 	/**
 	 * Rotates this matrix, but takes the values of sine and cosine,
 	 * so it might be useful when you rotate multiple matrices by the same angle

flixel/text/FlxText.hx

@@ -1056,6 +1056,8 @@ class FlxText extends FlxSprite
 			if (angle != 0)
 				_matrix.rotateWithTrig(_cosAngle, _sinAngle);
 		}
+
+		_matrix.concat(transform);
 
 		// same as super but checks _graphicOffset
 		getScreenPosition(_point, camera).subtractPoint(offset).subtractPoint(_graphicOffset);