private void MapControlMouseWheel(object sender, MouseWheelEventArgs e)
{
if (!_viewportInitialized)
{
return;
}
if (ZoomLocked)
{
return;
}
_currentMousePosition = e.GetPosition(this); //Needed for both MouseMove and MouseWheel event for mousewheel event
if (double.IsNaN(_toResolution))
{
_toResolution = Map.Viewport.Resolution;
}
if (e.Delta > 0)
{
_toResolution = ZoomHelper.ZoomIn(_map.Resolutions, _toResolution);
}
else if (e.Delta < 0)
{
_toResolution = ZoomHelper.ZoomOut(_map.Resolutions, _toResolution);
}
e.Handled = true; //so that the scroll event is not sent to the html page.
// Some cheating for personal gain. This workaround could be ommitted if the zoom animations was on CenterX, CenterY and Resolution, not Resolution alone.
Map.Viewport.Center.X += 0.000000001;
Map.Viewport.Center.Y += 0.000000001;
StartZoomAnimation(Map.Viewport.Resolution, _toResolution);
}
public void ZoomOut()
{
if (double.IsNaN(_toResolution))
{
_toResolution = Map.Viewport.Resolution;
}
_toResolution = ZoomHelper.ZoomOut(_map.Resolutions, _toResolution);
ZoomMiddle();
}
private double DetermineNewResolution(int mouseWheelDelta, double currentResolution)
{
if (mouseWheelDelta > 0)
{
return(ZoomHelper.ZoomIn(_map.Resolutions, currentResolution));
}
if (mouseWheelDelta < 0)
{
return(ZoomHelper.ZoomOut(_map.Resolutions, currentResolution));
}
return(currentResolution);
}
public void ZoomOut()
{
if (ZoomLocked)
{
return;
}
if (!_viewportInitialized)
{
return;
}
Map.Viewport.Resolution = ZoomHelper.ZoomOut(_map.Resolutions, Map.Viewport.Resolution);
OnViewChanged();
}