(minor) use getAngle() instead of trAngle(0)

src/render/value/choice.cpp

@@ -110,7 +110,7 @@ void draw_choice_viewer(RotatedDC& dc, ValueViewer& viewer, ChoiceStyle& style,
 void get_options(Rotation& rot, ValueViewer& viewer, const ChoiceStyle& style, GeneratedImage::Options& opts) {
 	opts.package       = &viewer.getStylePackage();
 	opts.local_package = &viewer.getLocalPackage();
-	opts.angle         = rot.trAngle(0);
+	opts.angle         = rot.getAngle();
 	if (viewer.nativeLook()) {
 		opts.width = opts.height = 16;
 		opts.preserve_aspect = ASPECT_BORDER;

src/util/rotation.cpp

@@ -72,6 +72,7 @@ RealSize Rotation::trSize(const RealSize& size) const {
 	return RealSize(c * x + s * y, s * x + c * y);
 }
 */
+
 RealSize Rotation::trSizeToBB(const RealSize& size) const {
 	if (straight()) {
 		if (sideways()) {
@@ -85,6 +86,7 @@ RealSize Rotation::trSizeToBB(const RealSize& size) const {
 		return RealSize(fabs(c * x) + fabs(s * y), fabs(s * x) + fabs(c * y));
 	}
 }
+
 RealRect Rotation::trRectToBB(const RealRect& r) const {
 	if (straight()) {
 		RealSize s = trSizeToBB(r.size());
@@ -117,6 +119,8 @@ RealRect Rotation::trRectToBB(const RealRect& r) const {
 		return result;
 	}
 }
+
+
 RealRect Rotation::trRectStraight(const RealRect& r) const {
 	assert(angle == 0);
 	return RealRect(r.position() + origin, r.size());
@@ -139,6 +143,11 @@ RealPoint Rotation::trInv(const RealPoint& p) const {
 	return RealPoint((c * x - s * y) / zoomX,
 	                 (s * x + c * y) / zoomY);
 }
+RealSize Rotation::trInv(const RealSize& x) const {
+	double a = deg_to_rad(angle), s = sin(a), c = cos(a);
+	return RealSize((c * x.width - s * x.height) / zoomX,
+	                (s * x.width + c * x.height) / zoomY);
+}
 
 RealPoint Rotation::boundingBoxCorner(const RealSize& size) const {
 	// This function is a bit tricky,

src/util/rotation.hpp

@@ -98,6 +98,8 @@ class Rotation {
 	
 	/// Translate a point back to internal coordinates
 	RealPoint trInv(const RealPoint& p) const;
+	/// Translate a size back to internal coordinates
+	RealSize  trInv(const RealSize& p) const;
 	
   protected:
 	int angle;				///< The angle of rotation in degrees (counterclockwise)