rotation snapping by 15 degrees

Author: pgilfernandez

src/core/canvasmouseinteractions.cpp

@@ -57,6 +57,7 @@
 #include <QMenu>
 #include <QInputDialog>
 #include <QApplication>
+#include <cmath>
 
 using namespace Friction::Core;
 
@@ -830,6 +831,11 @@ void Canvas::rotateSelected(const eMouseEvent& e) {
         rot = d_rot + mRotHalfCycles*180;
     }
 
+    if (!mValueInput.inputEnabled() && e.shiftMod()) {
+        constexpr qreal snapStep = 15.0;
+        rot = std::round(rot / snapStep) * snapStep;
+    }
+
     if(mCurrentMode == CanvasMode::boxTransform) {
         rotateSelectedBy(rot, absPos, mStartTransform);
     } else {