01 SbBool eventHandler(void *data, QEvent *anEvent)
02 {
03    // Pointer to rendering area
04    SoQtRenderArea *renderArea = (SoQtRenderArea *) data;
05    QMouseEvent *MouseEvent;
06    SbVec3f vector;
07    SbBool handled = TRUE;
08 
09    // What event has happened?
10    switch(anEvent->type()) {
11       case QEvent::MouseButtonPress:
12          // Mouse key pressed 
13          MouseEvent = (QMouseEvent *) anEvent;
14 
15          if(MouseEvent->button() == Qt::LeftButton) {
16             // Left mouse key: new dot
17             Projection(renderArea,MouseEvent->x(),
18                        MouseEvent->y(), vector);
19             newDot(renderArea, vector);
20          }
21          else if(MouseEvent->button() == Qt::MidButton) {
22             // Center mouse key: rotate camera
23             ticker->schedule();
24          }
25          else if(MouseEvent->button() == Qt::RightButton) {
26             // right mouse key: delete all dots
27             deleteDots(renderArea);
28          }
29          break;
30       case QEvent::MouseButtonRelease:
31          // Mouse button is released
32          MouseEvent = (QMouseEvent *) anEvent;
33          if(MouseEvent->button() == Qt::MidButton) {
34             // Center mouse key: camera stable 
35             ticker->unschedule();
36          }
37          break;
38       case QEvent::MouseMove:
39          // The Mouse is moved
40          MouseEvent = (QMouseEvent *) anEvent;
41          if(MouseEvent->state()) {
42             // Key pressed
43             Projection(renderArea,MouseEvent->x(),
44                        MouseEvent->y(), vector);
45             newDot(renderArea, vector);
46          }
47          break;
48    }
49    return handled;
50 }