feat: Add animated home button to view cube to reset camera

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

src/Camera.cpp

@@ -269,6 +269,70 @@ void Camera::animateToPlaneView(int plane)
     animGroup->start(QAbstractAnimation::DeleteWhenStopped);
 }
 
+void Camera::animateToHomeView()
+{
+    auto* animGroup = new QParallelAnimationGroup(this);
+
+    const float full_circle = 360.0f * 16.0f;
+
+    float currentXRot = xRotation();
+    float targetXRot = 30 * 16;
+    float diffX = targetXRot - currentXRot;
+    diffX = fmod(diffX, full_circle);
+    if (diffX > full_circle / 2.0f) {
+        diffX -= full_circle;
+    } else if (diffX < -full_circle / 2.0f) {
+        diffX += full_circle;
+    }
+
+    auto* xRotAnim = new QPropertyAnimation(this, "xRotation");
+    xRotAnim->setDuration(300);
+    xRotAnim->setStartValue(currentXRot);
+    xRotAnim->setEndValue(currentXRot + diffX);
+    xRotAnim->setEasingCurve(QEasingCurve::InOutQuad);
+    animGroup->addAnimation(xRotAnim);
+
+    float currentYRot = yRotation();
+    float targetYRot = -45 * 16;
+    float diffY = targetYRot - currentYRot;
+    diffY = fmod(diffY, full_circle);
+    if (diffY > full_circle / 2.0f) {
+        diffY -= full_circle;
+    } else if (diffY < -full_circle / 2.0f) {
+        diffY += full_circle;
+    }
+
+    auto* yRotAnim = new QPropertyAnimation(this, "yRotation");
+    yRotAnim->setDuration(300);
+    yRotAnim->setStartValue(currentYRot);
+    yRotAnim->setEndValue(currentYRot + diffY);
+    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 Camera::startRotation(const QVector3D& pivot)
 {
     m_rotationPivot = pivot;

src/Camera.h

@@ -41,6 +41,7 @@ public:
 
     void animateToPlaneView(int plane);
     void animateRestoreState();
+    void animateToHomeView();
 
     void startRotation(const QVector3D& pivot);
     void stopRotation();

src/ViewCube.cpp

@@ -5,10 +5,12 @@
 #include <QOpenGLShaderProgram>
 #include <QOpenGLTexture>
 #include <QScreen>
+#include <QSvgRenderer>
 #include <QVector>
 
 ViewCube::ViewCube()
 {
+    m_homeButtonRenderer = new QSvgRenderer(QString(":/icons/rectangle.svg"));
     for (int i = 0; i < 6; ++i) {
         m_faceTextures[i] = nullptr;
     }
@@ -20,6 +22,7 @@ ViewCube::~ViewCube()
         delete m_faceTextures[i];
     }
     delete m_textureShaderProgram;
+    delete m_homeButtonRenderer;
     m_cubeVbo.destroy();
     m_cubeVao.destroy();
     m_axesVbo.destroy();
@@ -42,10 +45,9 @@ void ViewCube::paintGL(QOpenGLShaderProgram* simpleShader, int simpleShaderColor
     QRect viewCubeRect(width - viewCubeSize, 0, viewCubeSize, viewCubeSize);
     QPoint physicalMousePos = mousePos * QGuiApplication::primaryScreen()->devicePixelRatio();
 
-    float opacity = 0.5f;
-    if (viewCubeRect.contains(physicalMousePos)) {
-        opacity = 1.0f;
-    }
+    m_isHovered = viewCubeRect.contains(physicalMousePos);
+
+    float opacity = m_isHovered ? 1.0f : 0.5f;
 
     glEnable(GL_BLEND);
     glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
@@ -210,3 +212,39 @@ void ViewCube::drawAxes(QOpenGLShaderProgram* simpleShader, int colorLoc, const
 
     glLineWidth(1.0f);
 }
+
+void ViewCube::paint2D(QPainter& painter, int widgetWidth, int widgetHeight)
+{
+    if (!m_isHovered) {
+        return;
+    }
+
+    int viewCubeSize = 150; // logical pixels
+    int buttonSize = 24;
+    int buttonMargin = 8;
+
+    int viewCubeX = widgetWidth - viewCubeSize;
+    int viewCubeY = 0;
+
+    m_homeButtonRect = QRect(viewCubeX - buttonMargin - buttonSize, viewCubeY, buttonSize, buttonSize);
+
+    if (m_homeButtonRenderer && m_homeButtonRenderer->isValid()) {
+        m_homeButtonRenderer->render(&painter, m_homeButtonRect);
+    }
+}
+
+bool ViewCube::handleMousePress(const QPoint& pos, int widgetWidth, int widgetHeight)
+{
+    if (!m_isHovered) {
+        return false;
+    }
+
+    int viewCubeSize = 150;
+    int buttonSize = 24;
+    int buttonMargin = 8;
+    int viewCubeX = widgetWidth - viewCubeSize;
+    int viewCubeY = 0;
+    QRect homeButtonRect(viewCubeX - buttonMargin - buttonSize, viewCubeY, buttonSize, buttonSize);
+
+    return homeButtonRect.contains(pos);
+}

src/ViewCube.h

@@ -9,6 +9,8 @@
 
 class QOpenGLShaderProgram;
 class QOpenGLTexture;
+class QPainter;
+class QSvgRenderer;
 
 class ViewCube : protected QOpenGLFunctions
 {
@@ -18,6 +20,8 @@ public:
 
     void initializeGL();
     void paintGL(QOpenGLShaderProgram* simpleShader, int simpleShaderColorLoc, const QMatrix4x4& viewMatrix, int width, int height, const QPoint& mousePos);
+    void paint2D(QPainter& painter, int widgetWidth, int widgetHeight);
+    bool handleMousePress(const QPoint& pos, int widgetWidth, int widgetHeight);
 
 private:
     void createFaceTextures();
@@ -26,6 +30,10 @@ private:
     void drawViewCube(const QMatrix4x4& projection, const QMatrix4x4& view, float opacity);
     void drawAxes(QOpenGLShaderProgram* simpleShader, int colorLoc, const QMatrix4x4& projection, const QMatrix4x4& view);
 
+    bool m_isHovered = false;
+    QRect m_homeButtonRect;
+    QSvgRenderer* m_homeButtonRenderer = nullptr;
+
     QOpenGLTexture* m_faceTextures[6];
 
     QOpenGLShaderProgram* m_textureShaderProgram = nullptr;

src/ViewportWidget.cpp

@@ -202,6 +202,7 @@ void ViewportWidget::paintGL()
         m_sketchGrid->paintAxisLabels(painter, static_cast<SketchGrid::SketchPlane>(m_currentPlane), model, projection);
     }
     m_featureBrowser->paint(painter, width(), height());
+    m_viewCube->paint2D(painter, width(), height());
 
 
     if (m_activeSketchTool) {
@@ -230,6 +231,12 @@ void ViewportWidget::mousePressEvent(QMouseEvent *event)
     }
 
     if (event->button() == Qt::LeftButton) {
+        if (m_viewCube->handleMousePress(event->pos(), width(), height())) {
+            m_camera->animateToHomeView();
+            update();
+            return;
+        }
+
         if (m_isSelectingPlane) {
             if (m_highlightedPlane != SketchPlane::NONE) {
                 emit planeSelected(m_highlightedPlane);