Add a zoom with z+wheel

GraphicsView/include/CGAL/Qt/camera_impl.h

@@ -2115,7 +2115,7 @@ void Camera::initFromDOMElement(const QDomElement &element) {
   while (!child.isNull()) {
     if (child.tagName() == "Parameters") {
       // #CONNECTION# Default values set in constructor
-      setFieldOfView(DomUtils::qrealFromDom(child, "fieldOfView", CGAL_PI / 4.0));
+      //setFieldOfView(DomUtils::qrealFromDom(child, "fieldOfView", CGAL_PI / 4.0));
       setZNearCoefficient(
           DomUtils::qrealFromDom(child, "zNearCoefficient", 0.005));
       setZClippingCoefficient(

GraphicsView/include/CGAL/Qt/manipulatedCameraFrame_impl.h

@@ -424,6 +424,23 @@ void ManipulatedCameraFrame::wheelEvent(QWheelEvent *const event,
         inverseTransformOf(Vec(0.0, 0.0, 0.2 * flySpeed() * event->angleDelta().y())));
     Q_EMIT manipulated();
     break;
+  case ZOOM_FOV:
+  {
+    qreal delta = - wheelDelta(event);//- sign to keep the same behavior as for the ZOOM action.
+    qreal new_fov = delta/100 + camera->fieldOfView();
+    if(new_fov > CGAL_PI/180.0)
+    {
+      new_fov = delta + camera->fieldOfView();
+    }
+    if(new_fov > CGAL_PI/4.0)
+      new_fov = CGAL_PI/4.0;
+    if( new_fov >= 0.0)
+    {
+      camera->setFieldOfView(new_fov);
+    }
+    Q_EMIT manipulated();
+    break;
+  }
   default:
     break;
   }
@@ -447,7 +464,10 @@ void ManipulatedCameraFrame::wheelEvent(QWheelEvent *const event,
   // isManipulated() returns false. But then fastDraw would not be used with
   // wheel. Detecting the last wheel event and forcing a final draw() is done
   // using the timer_.
+  if(action_ != ZOOM_FOV)
     action_ = NO_MOUSE_ACTION;
+  //else done after postDraw().
+
 }
 
 ////////////////////////////////////////////////////////////////////////////////

GraphicsView/include/CGAL/Qt/qglviewer_impl.h

@@ -606,6 +606,25 @@ void CGAL::QGLViewer::postDraw() {
     painter.drawRect(QRect(camera()->frame()->pressPos_, mapFromGlobal(QCursor::pos())));
     painter.end();
   }
+
+  //zoom_fov indicator
+  if(camera()->frame()->action_ == qglviewer::ZOOM_FOV)
+  {
+    QPainter painter(this);
+    QPoint bot(width()-30,height()/2-0.33*height()),
+           top(width()-30, height()/2+0.33*height());
+    int fov_height = (top.y()-bot.y())*camera()->fieldOfView()*4.0/CGAL_PI + bot.y();
+
+
+    painter.setPen(QColor(120,120,120));
+    painter.drawLine(bot, top);
+    painter.fillRect(QRect(QPoint(width()-40, fov_height+10),
+                           QPoint(width()-20, fov_height-10)),
+                     QColor(120,120,120));
+    painter.end();
+    camera()->frame()->action_= qglviewer::NO_MOUSE_ACTION;
+  }
+
 }
 
 
@@ -740,6 +759,7 @@ void CGAL::QGLViewer::setDefaultMouseBindings() {
 
     setWheelBinding(modifiers, mh, qglviewer::ZOOM);
   }
+  setWheelBinding(::Qt::Key_Z, ::Qt::NoModifier, qglviewer::CAMERA, qglviewer::ZOOM_FOV);
 
   // Z o o m   o n   r e g i o n
   setMouseBinding(::Qt::ShiftModifier, ::Qt::MidButton, qglviewer::CAMERA, qglviewer::ZOOM_ON_REGION);
@@ -761,6 +781,7 @@ void CGAL::QGLViewer::setDefaultMouseBindings() {
   setMouseBinding(::Qt::Key_Z, ::Qt::NoModifier, ::Qt::LeftButton, qglviewer::ZOOM_ON_PIXEL);
   setMouseBinding(::Qt::Key_Z, ::Qt::NoModifier, ::Qt::RightButton, qglviewer::ZOOM_TO_FIT);
 
+
 #ifdef Q_OS_MAC
   // Specific Mac bindings for touchpads. Two fingers emulate a wheelEvent which
   // zooms. There is no right button available : make Option key + left emulate
@@ -2730,14 +2751,16 @@ void CGAL::QGLViewer::setWheelBinding(::Qt::Key key, ::Qt::KeyboardModifiers mod
                                 bool withConstraint) {
   //#CONNECTION# ManipulatedFrame::wheelEvent and
   // ManipulatedCameraFrame::wheelEvent switches
-  if ((action != qglviewer::ZOOM) && (action != qglviewer::MOVE_FORWARD) &&
+  if ((action != qglviewer::ZOOM) && (action != qglviewer::ZOOM_FOV) &&
-      (action != qglviewer::MOVE_BACKWARD) && (action != qglviewer::NO_MOUSE_ACTION)) {
+      (action != qglviewer::MOVE_FORWARD) && (action != qglviewer::MOVE_BACKWARD)
+      && (action != qglviewer::NO_MOUSE_ACTION)) {
     qWarning("Cannot bind %s to wheel",
              mouseActionString(action).toLatin1().constData());
     return;
   }
 
-  if ((handler == qglviewer::FRAME) && (action != qglviewer::ZOOM) && (action != qglviewer::NO_MOUSE_ACTION)) {
+  if ((handler == qglviewer::FRAME) && (action != qglviewer::ZOOM)
+      && (action != qglviewer::NO_MOUSE_ACTION)) {
     qWarning("Cannot bind %s to FRAME wheel",
              mouseActionString(action).toLatin1().constData());
     return;

GraphicsView/include/CGAL/Qt/viewer_actions.h

@@ -79,7 +79,8 @@ enum MouseAction {
   ROLL,
   DRIVE,
   SCREEN_TRANSLATE,
-  ZOOM_ON_REGION
+  ZOOM_ON_REGION,
+  ZOOM_FOV
 };
 
 enum SnapShotBackground {