public static Tuple <Shape, string> FindShapeAtPoint(this Canvas Canvas, Point Pos)
{
Shape found = null;
var posRect = Pos.GetRectAtPoint();
string comboDebug = null;
foreach (var elem in Canvas.Children)
{
var uiShape = elem as Shape;
if (uiShape != null)
{
if (uiShape is Line)
{
var uiLine = uiShape as Line;
if (uiLine.IntersectsWith(Pos))
{
found = uiShape;
break;
}
}
else if (uiShape is Path)
{
var uiPath = uiShape as Path;
var rectGeom = new RectangleGeometry();
rectGeom.Rect = new Rect(Pos, new Size(1, 1));
var rp = new Path();
rp.Fill = Brushes.Black;
rp.Stroke = Brushes.Black;
rp.StrokeThickness = 1;
rp.Data = rectGeom;
var xx = uiPath.RenderedGeometry.FillContainsWithDetail(rectGeom);
if (xx == IntersectionDetail.Intersects)
{
found = uiShape;
break;
}
}
else
{
var rect = CanvasExt.GetShapeRect(uiShape);
if (rect.IntersectsWith(posRect))
{
found = uiShape;
break;
}
}
}
}
return(new Tuple <Shape, string>(found, comboDebug));
}
/// <summary>
/// Find the first shape on the canvas at the point. If no shape found, look for
/// shapes that are between the PriorPos and the Pos. Shapes between the two
/// positions are passed over shapes. Return the estimated pass over point.
/// </summary>
/// <param name="Canvas"></param>
/// <param name="Pos"></param>
/// <param name="PriorPos"></param>
/// <returns></returns>
public static Tuple <Shape, Point?> FindShapeAtPoint(
this Canvas Canvas, Point Pos, Point?PriorPos)
{
Shape found = null;
Point?estPassOverPoint = null;
var posRect = Pos.GetRectAtPoint();
foreach (var elem in Canvas.Children)
{
var uiShape = elem as Shape;
if (uiShape != null)
{
if (uiShape is Line)
{
var uiLine = uiShape as Line;
if (uiLine.IntersectsWith(Pos))
{
found = uiShape;
break;
}
}
else
{
var rect = CanvasExt.GetShapeRect(uiShape);
if (rect.IntersectsWith(posRect))
{
found = uiShape;
break;
}
}
}
}
return(new Tuple <Shape, Point?>(found, estPassOverPoint));
}