Hello Visaders,
Those with mouse wheel and Java 1.4 or higher may find this piece of
code useful, it implements the zoom. Its very simple and better than
using the "shift + left button".
But the behavior is a little diferent from the "shift + left button"
zoom, the center is the center of the box, not the center of the screen
as the user might expect. I think this problem has already been solved
in the list but I couldnt find it in the archive. Any other sugestions
on funcionality and performance would also be apreciated:
//display is an instance of DisplayImpl that in this case must be
declared final,
//but you can workaround this by calling a method outside the listener
display.getComponent().addMouseWheelListener(new
java.awt.event.MouseWheelListener() {
public void mouseWheelMoved(java.awt.event.MouseWheelEvent e) {
int rot = e.getWheelRotation();
try{
ProjectionControl pControl = display.getProjectionControl();
double[] pControlMatrix = pControl.getMatrix();
// 3D
if (pControlMatrix.length > 10){
// Zoom in
if (rot < 0){
pControlMatrix[0] = pControlMatrix[0]*1.1f;
pControlMatrix[5] = pControlMatrix[5]*1.1f;
pControlMatrix[10] = pControlMatrix[10]*1.1f;
}
// Zoom out
if (rot > 0){
pControlMatrix[0] = pControlMatrix[0]*0.9f;
pControlMatrix[5] = pControlMatrix[5]*0.9f;
pControlMatrix[10] = pControlMatrix[10]*0.9f;
}
// 2D
} else {
// Zoom in
if (rot < 0){
pControlMatrix[0] = pControlMatrix[0]*1.1f;
pControlMatrix[3] = pControlMatrix[3]*1.1f;
}
// Zoom out
if (rot > 0){
pControlMatrix[0] = pControlMatrix[0]*0.9f;
pControlMatrix[3] = pControlMatrix[3]*0.9f;
}
}
pControl.setMatrix(pControlMatrix);
pControl.saveProjection();
} catch (RemoteException re) {}
catch (VisADException ve) {}
}
});
Cicero Zandona
