public IEventResult OnMouseWheel(IMouseWheelEventArgs e)
{
return(null);
}
private void Zoom(IMouseWheelEventArgs e)
{
CADPoint globalPnt_UnderMouse = _drawing.CanvasToModel(new CADPoint(e.X, e.Y));
CADPoint localPnt_UnderMouse = new CADPoint(e.X, e.Y);
//
// Mouse wheel was spinned.
// Calculate new scale.
double currentScale = Scale;
//
// Delta > 0 - scrolling to user
// Delta < 0 - from user
if (e.Delta > 0)
{
// zoom out
if (currentScale >= m_ScaleList[m_ScaleList.Count - 1])
{
return;
}
foreach (double rVal in m_ScaleList)
{
if (currentScale < rVal)
{
Scale = rVal;
break;
}
}
}
else
{
// zoom in
if (currentScale <= m_ScaleList[0])
{
return;
}
int iIndex = m_ScaleList.Count - 1;
while (iIndex >= 0)
{
if (currentScale > m_ScaleList[iIndex])
{
Scale = m_ScaleList[iIndex];
break;
}
--iIndex;
}
}
//
// Need to save cursor position - cursor should been placed over same point in global coordiantes.
globalPnt_UnderMouse.X *= Scale;
globalPnt_UnderMouse.Y *= Scale;
// reverse Y
// read comment in GetLocalPoint()
globalPnt_UnderMouse.Y *= -1;
_drawing.Origin = globalPnt_UnderMouse - localPnt_UnderMouse;
// reverse Y
_drawing.Origin.Y *= -1;
// m_TempOffsetVector.X = 0;
// m_TempOffsetVector.Y = 0;
_drawing.Canvas.Redraw();
}
