/**
* Insert the method's description here. Creation date: (24/10/01 0:50:39)
*/
public void setViewportPosition(int hValue, int vValue) {
Box boxViewport = new Box(_canvas.getViewport());
boxViewport.scale(1.0 / _canvas.zoom);
Box boxWorld = new Box(boxViewport);
Box boxExtent;
if (_circuit != null)
boxExtent = _circuit.getExtent();