feat: Animate camera transitions for sketch mode

Co-authored-by: aider (gemini/gemini-2.5-pro) <aider@aider.chat>

src/ViewportWidget.cpp

@@ -9,6 +9,8 @@
 #include <QPainter>
 #include <QWheelEvent>
 #include <QApplication>
+#include <QPropertyAnimation>
+#include <QParallelAnimationGroup>
 
 ViewportWidget::ViewportWidget(QWidget *parent)
     : QOpenGLWidget(parent)
@@ -30,6 +32,51 @@ void ViewportWidget::setDocument(Document* document)
     m_featureBrowser->setDocument(document);
 }
 
+float ViewportWidget::xRotation() const { return xRot; }
+void ViewportWidget::setXRotation(float angle)
+{
+    if (angle != xRot) {
+        xRot = angle;
+        update();
+    }
+}
+
+float ViewportWidget::yRotation() const { return yRot; }
+void ViewportWidget::setYRotation(float angle)
+{
+    if (angle != yRot) {
+        yRot = angle;
+        update();
+    }
+}
+
+float ViewportWidget::zoom() const { return zoom; }
+void ViewportWidget::setZoom(float value)
+{
+    if (value != zoom) {
+        zoom = value;
+        update();
+    }
+}
+
+float ViewportWidget::panX() const { return panX; }
+void ViewportWidget::setPanX(float value)
+{
+    if (value != panX) {
+        panX = value;
+        update();
+    }
+}
+
+float ViewportWidget::panY() const { return panY; }
+void ViewportWidget::setPanY(float value)
+{
+    if (value != panY) {
+        panY = value;
+        update();
+    }
+}
+
 void ViewportWidget::initializeGL()
 {
     initializeOpenGLFunctions();
@@ -124,33 +171,117 @@ void ViewportWidget::wheelEvent(QWheelEvent *event)
 void ViewportWidget::startSketch(SketchPlane plane)
 {
     m_currentPlane = plane;
-    panX = 0;
-    panY = 0;
-    zoom = -20.0f; // Zoom out to see the grid
 
+    m_savedXRot = xRot;
+    m_savedYRot = yRot;
+    m_savedPanX = panX;
+    m_savedPanY = panY;
+    m_savedZoom = zoom;
+
+    float targetXRot = xRot;
+    float targetYRot = yRot;
     switch (plane) {
         case SketchPlane::XY: // Front view
-            xRot = 0;
+            targetXRot = 0;
-            yRot = 0;
+            targetYRot = 0;
             break;
         case SketchPlane::XZ: // Top view
-            xRot = -90 * 16;
+            targetXRot = -90 * 16;
-            yRot = 0;
+            targetYRot = 0;
             break;
         case SketchPlane::YZ: // Right view
-            xRot = 0;
+            targetXRot = 0;
-            yRot = 90 * 16;
+            targetYRot = 90 * 16;
             break;
         case SketchPlane::NONE:
             break;
     }
-    update();
+
+    auto* animGroup = new QParallelAnimationGroup(this);
+
+    auto* xRotAnim = new QPropertyAnimation(this, "xRotation");
+    xRotAnim->setDuration(300);
+    xRotAnim->setStartValue(xRot);
+    xRotAnim->setEndValue(targetXRot);
+    xRotAnim->setEasingCurve(QEasingCurve::InOutQuad);
+    animGroup->addAnimation(xRotAnim);
+
+    auto* yRotAnim = new QPropertyAnimation(this, "yRotation");
+    yRotAnim->setDuration(300);
+    yRotAnim->setStartValue(yRot);
+    yRotAnim->setEndValue(targetYRot);
+    yRotAnim->setEasingCurve(QEasingCurve::InOutQuad);
+    animGroup->addAnimation(yRotAnim);
+
+    auto* panXAnim = new QPropertyAnimation(this, "panX");
+    panXAnim->setDuration(300);
+    panXAnim->setStartValue(panX);
+    panXAnim->setEndValue(0.0f);
+    panXAnim->setEasingCurve(QEasingCurve::InOutQuad);
+    animGroup->addAnimation(panXAnim);
+
+    auto* panYAnim = new QPropertyAnimation(this, "panY");
+    panYAnim->setDuration(300);
+    panYAnim->setStartValue(panY);
+    panYAnim->setEndValue(0.0f);
+    panYAnim->setEasingCurve(QEasingCurve::InOutQuad);
+    animGroup->addAnimation(panYAnim);
+
+    auto* zoomAnim = new QPropertyAnimation(this, "zoom");
+    zoomAnim->setDuration(300);
+    zoomAnim->setStartValue(zoom);
+    zoomAnim->setEndValue(-20.0f);
+    zoomAnim->setEasingCurve(QEasingCurve::InOutQuad);
+    animGroup->addAnimation(zoomAnim);
+
+    animGroup->start(QAbstractAnimation::DeleteWhenStopped);
 }
 
 void ViewportWidget::saveSketch()
 {
+    auto* animGroup = new QParallelAnimationGroup(this);
+
+    auto* xRotAnim = new QPropertyAnimation(this, "xRotation");
+    xRotAnim->setDuration(300);
+    xRotAnim->setStartValue(xRot);
+    xRotAnim->setEndValue(m_savedXRot);
+    xRotAnim->setEasingCurve(QEasingCurve::InOutQuad);
+    animGroup->addAnimation(xRotAnim);
+
+    auto* yRotAnim = new QPropertyAnimation(this, "yRotation");
+    yRotAnim->setDuration(300);
+    yRotAnim->setStartValue(yRot);
+    yRotAnim->setEndValue(m_savedYRot);
+    yRotAnim->setEasingCurve(QEasingCurve::InOutQuad);
+    animGroup->addAnimation(yRotAnim);
+
+    auto* panXAnim = new QPropertyAnimation(this, "panX");
+    panXAnim->setDuration(300);
+    panXAnim->setStartValue(panX);
+    panXAnim->setEndValue(m_savedPanX);
+    panXAnim->setEasingCurve(QEasingCurve::InOutQuad);
+    animGroup->addAnimation(panXAnim);
+
+    auto* panYAnim = new QPropertyAnimation(this, "panY");
+    panYAnim->setDuration(300);
+    panYAnim->setStartValue(panY);
+    panYAnim->setEndValue(m_savedPanY);
+    panYAnim->setEasingCurve(QEasingCurve::InOutQuad);
+    animGroup->addAnimation(panYAnim);
+
+    auto* zoomAnim = new QPropertyAnimation(this, "zoom");
+    zoomAnim->setDuration(300);
+    zoomAnim->setStartValue(zoom);
+    zoomAnim->setEndValue(m_savedZoom);
+    zoomAnim->setEasingCurve(QEasingCurve::InOutQuad);
+    animGroup->addAnimation(zoomAnim);
+
+    connect(animGroup, &QParallelAnimationGroup::finished, this, [this]() {
         m_currentPlane = SketchPlane::NONE;
         update();
+    });
+
+    animGroup->start(QAbstractAnimation::DeleteWhenStopped);
 }
 
 QVector3D ViewportWidget::project(const QVector3D& worldCoord, const QMatrix4x4& modelView, const QMatrix4x4& projection, const QRect& viewport)

src/ViewportWidget.h

@@ -17,6 +17,12 @@ class ViewportWidget : public QOpenGLWidget, protected QOpenGLFunctions
 {
     Q_OBJECT
 
+    Q_PROPERTY(float xRotation READ xRotation WRITE setXRotation)
+    Q_PROPERTY(float yRotation READ yRotation WRITE setYRotation)
+    Q_PROPERTY(float zoom READ zoom WRITE setZoom)
+    Q_PROPERTY(float panX READ panX WRITE setPanX)
+    Q_PROPERTY(float panY READ panY WRITE setPanY)
+
 public:
     enum class SketchPlane {
         NONE,
@@ -32,6 +38,21 @@ public:
     void saveSketch();
     void setDocument(Document* document);
 
+    float xRotation() const;
+    void setXRotation(float angle);
+
+    float yRotation() const;
+    void setYRotation(float angle);
+
+    float zoom() const;
+    void setZoom(float value);
+
+    float panX() const;
+    void setPanX(float value);
+
+    float panY() const;
+    void setPanY(float value);
+
 protected:
     void initializeGL() override;
     void paintGL() override;
@@ -57,6 +78,12 @@ private:
     float panX = 0;
     float panY = 0;
     QPoint lastPos;
+
+    float m_savedXRot = 0;
+    float m_savedYRot = 0;
+    float m_savedZoom = -5.0f;
+    float m_savedPanX = 0;
+    float m_savedPanY = 0;
 };
 
 #endif // VIEWPORTWIDGET_H