public override void HandleMouseDown(MouseButtonEventArgs e)
{
base.HandleMouseDown(e);
if (e.ChangedButton != MouseButton.Left)
{
return;
}
Canvas.StateInfo.Tip = "Drawing... double click to end";
var point = e.GetPosition(Canvas);
point = AlignPointToXY(point);
if (prePoint == default || (prePoint != default && point != prePoint))
{
points.Add(point);
}
prePoint = point;
if (e.ClickCount == 2)
{
prePoint = default;
points.Clear();
// The user might double click in the same place.
if (element != null)
{
CreationComplete(element);
element = null;
}
Canvas.StateInfo.Tip = StateTip;
}
}
protected override void CreationComplete(DrawingComponent ele)
{
if (ele is DrawingLineString)
{
Canvas.RemoveVisual(ele);
}
else
{
var container = Canvas.GetVisuals().OfType <DrawingPolygon>()
.FirstOrDefault(v => v.Geometry.FillContains(ele.Geometry));
if (container != null)
{
var holes = new List <IEnumerable <Point> > {
(ele as DrawingPolygon).Shell
};
if (container.HasHoles)
{
holes.AddRange(container.Holes);
}
container.Update(container.Shell, holes);
container.Render(DrawingCanvas.DefaultPen);
Canvas.RemoveVisual(ele);
}
Canvas._version++;
}
}
public override void HandleKeyDown(KeyEventArgs e)
{
base.HandleKeyDown(e);
if (e.Key == Key.Delete && selectedVisual != null)
{
if (!(selectedVisual is DrawingPoint))
{
Canvas._version++;
}
Canvas.RemoveVisual(selectedVisual);
selectedVisual = null;
}
}
public static Geometry ToNTSGeometry(this DrawingComponent component)
{
if (component is DrawingPolygon drawingPolygon)
{
return(drawingPolygon.ToNTSGeometry());
}
if (component is DrawingLineString drawingLineString)
{
return(drawingLineString.ToNTSGeometry());
}
if (component is DrawingPoint drawingPoint)
{
return(drawingPoint.ToNTSGeometry());
}
return(null);
}
public override void HandleMouseDown(MouseButtonEventArgs e)
{
base.HandleMouseDown(e);
if (e.ChangedButton != MouseButton.Left)
{
return;
}
isDragging = true;
var position = e.GetPosition(Canvas);
var visual = Canvas.GetVisual(position);
if (visual != null && visual.IsReadOnly)
{
return;
}
selectedVisual = visual;
if (selectedVisual != null)
{
selectedVisual.Render(DrawingCanvas.HighLightPen);
Canvas.CaptureMouse();
}
}
protected override void CreationComplete(DrawingComponent com)
{
Canvas._version++;
}
protected virtual void CreationComplete(DrawingComponent com)
{
}
public void RemoveVisual(DrawingComponent visual)
{
visuals.Remove(visual);
RemoveVisualChild(visual);
RemoveLogicalChild(visual);
}
public void AddVisual(DrawingComponent visual)
{
visuals.Add(visual);
AddVisualChild(visual);
AddLogicalChild(visual);
}