private void OnTouch(object sender, TouchEventArgs args)
{
if (Map.Lock)
{
return;
}
var mapAction = _touchHandler.Handle(args.Event);
if (mapAction == MapAction.RefreshGraphics)
{
Map.Viewport.Transform(
_touchHandler.Touch.X, _touchHandler.Touch.Y,
_touchHandler.PreviousTouch.X, _touchHandler.PreviousTouch.Y,
_touchHandler.Scale);
Map.Viewport.Resolution = Restrict.RestrictZoom(Map.Viewport, Map.Resolutions, Map.Envelope);
Restrict.RestrictPan(Map.Viewport, Map.Envelope);
Invalidate();
}
else if (mapAction == MapAction.RefreshData)
{
Map.ViewChanged(true);
}
}
public void TestRestrictZoom()
{
// arrange
var restrictPanZoom = new RestrictPanZoom {
PanMode = RestrictPanMode.KeepCenterWithinExtents
};
var viewport = new Viewport {
Center = new Point(0, 0), Width = 100, Height = 100, Resolution = 1
};
// viewport.Center is (0, 0) at this point
var restrictTo = new BoundingBox(20, 40, 120, 140); // Minimal X value is 20, Minimal Y value is 40
// act
restrictPanZoom.RestrictPan(viewport, restrictTo);
// assert
Assert.AreEqual(viewport.Center.X, 20);
Assert.AreEqual(viewport.Center.Y, 40);
}