Puzzle app. Piece rotation with step 15 degrees by holding Ctrl key.

ChangeLog.txt

@@ -8,6 +8,7 @@
 - Fix parsing SVG fonts.
 - Add "Twin Sans" single stroke font.
 - Fixed generation of mirror side of piece based on fold line. 
+- Puzzle app. Piece rotation with step 15 degrees by holding Ctrl key.
 
 # Valentina 0.7.53 June 25, 2024
 - Fix layout sheet export with empty name.

src/app/puzzle/scene/vpgraphicspiececontrols.cpp

@@ -409,6 +409,7 @@ void VPGraphicsPieceControls::mousePressEvent(QGraphicsSceneMouseEvent *event)
     if (event->button() == Qt::LeftButton && event->type() != QEvent::GraphicsSceneMouseDoubleClick)
     {
         m_rotationStartPoint = event->scenePos();
+        m_rotationSum = 0;
         m_controlsVisible = false;
         m_handleCorner = SelectedHandleCorner(event->pos());
         m_ignorePieceTransformation = true;
@@ -453,6 +454,16 @@ void VPGraphicsPieceControls::mouseMoveEvent(QGraphicsSceneMouseEvent *event)
         rotateOn = rotateOn - 360.;
     }
 
+    m_rotationSum += rotateOn;
+
+    if (event->modifiers() & Qt::ControlModifier)
+    {
+        const qreal sign = std::copysign(1.0, m_rotationSum);
+        const int steps = qFloor(qAbs(m_rotationSum / 15));
+        rotateOn = 15 * steps * sign;
+        m_rotationSum -= rotateOn;
+    }
+
     if (not qFuzzyIsNull(rotateOn))
     {
         if (VPLayoutPtr const layout = m_layout.toStrongRef(); not layout.isNull())

src/app/puzzle/scene/vpgraphicspiececontrols.h

@@ -151,6 +151,7 @@ private:
     bool allowChangeMerge{false};
     QList<VPPiecePtr> m_selectedPieces{};
     bool m_ignorePieceTransformation{false};
+    qreal m_rotationSum{0};
 
     QMap<VPHandleCornerType, QPixmap> m_handlePixmaps{};
     QMap<VPHandleCornerType, QPixmap> m_handleHoverPixmaps{};