public override void DrawEllipse (Brush brush, Pen pen, Point center, double radiusX, double radiusY)
		{
			cr.Save ();		

			cr.Translate (center.X, center.Y);
			cr.Scale (1, radiusY / radiusX);

			if (brush != null) {
				if (brush is SolidColorBrush) {
					var b = brush as SolidColorBrush;
					cr.Color = new Cairo.Color (b.Color.R, b.Color.G, b.Color.B, b.Color.Alfa);	
					cr.Arc (0, 0, radiusX, 0, 2 * Math.PI);			
			
					cr.Fill ();
				}
			}

			if (pen != null) {
				cr.Color = new Cairo.Color (pen.Color.R, pen.Color.G, pen.Color.B, pen.Color.Alfa);	
				cr.LineWidth = pen.Thickness;
				cr.Arc (0, 0, radiusX - pen.Thickness / 2, 0, 2 * Math.PI);				
			
				cr.Stroke ();
			}
			
			cr.Restore ();
		}
		public override void DrawRectangle (Brush brush, Pen pen, Rect rectangle)
		{
			if (brush != null) {
				if (brush is SolidColorBrush) {
					var b = brush as SolidColorBrush;
					cr.Color = new Cairo.Color (b.Color.R, b.Color.G, b.Color.B, b.Color.Alfa);	
					cr.Rectangle (rectangle.X, rectangle.Y, rectangle.Width, rectangle.Height);			
			
					cr.Fill ();
				} else if (brush is LinearGradientBrush) {
					var b = brush as LinearGradientBrush;
					
					var pattern = new Cairo.LinearGradient (b.StartPoint.X, b.StartPoint.Y, b.EndPoint.X, b.EndPoint.Y);
					foreach (var stop in b.GradientStops) {
						pattern.AddColorStop (stop.Offset, new Cairo.Color (stop.Color.R, stop.Color.G, stop.Color.B, stop.Color.Alfa));						
					}
					
					cr.Pattern = pattern;
					cr.Rectangle (rectangle.X, rectangle.Y, rectangle.Width, rectangle.Height);			
					cr.Fill ();
				}
			}

			if (pen != null) {
				cr.Color = new Cairo.Color (pen.Color.R, pen.Color.G, pen.Color.B, pen.Color.Alfa);	
				cr.LineWidth = pen.Thickness;
				cr.Rectangle (rectangle.X, rectangle.Y, rectangle.Width, rectangle.Height);			
			
				cr.Stroke ();
			}			
		}
		public override void DrawRoundedRectangle (Brush brush, Pen pen, Rect rectangle, double radiusX, double radiusY)
		{
			var figure = new PathFigure ();
			figure.StartPoint = new Point (rectangle.X + radiusX, rectangle.Y);
			figure.Segments.Add (new LineSegment () { Point = new Point(rectangle.X + rectangle.Width - radiusX, rectangle.Y) });
			figure.Segments.Add (new ArcSegment () 
			    {
					Point = new Point(rectangle.X + rectangle.Width, rectangle.Y + radiusY),
					Size = new Size(radiusX, radiusY),
					SweepDirection = SweepDirection.Clockwise,
					IsLargeArc = false
				}
			);
			figure.Segments.Add (new LineSegment () { Point = new Point(rectangle.X + rectangle.Width, rectangle.Y + rectangle.Height - radiusY) });
			figure.Segments.Add (new ArcSegment () 
			    {
					Point = new Point(rectangle.X + rectangle.Width - radiusX, rectangle.Y + rectangle.Height),
					Size = new Size(radiusX, radiusY),
					SweepDirection = SweepDirection.Clockwise,
					IsLargeArc = false
				}
			);
			figure.Segments.Add (new LineSegment () { Point = new Point(rectangle.X + radiusX, rectangle.Y + rectangle.Height) });
			figure.Segments.Add (new ArcSegment () 
			    {
					Point = new Point(rectangle.X, rectangle.Y + rectangle.Height - radiusY),
					Size = new Size(radiusX, radiusY),
					SweepDirection = SweepDirection.Clockwise,
					IsLargeArc = false
				}
			);
			figure.Segments.Add (new LineSegment () { Point = new Point(rectangle.X, rectangle.Y + radiusY) });
			figure.Segments.Add (new ArcSegment () 
			    {
					Point = new Point(rectangle.X + radiusX, rectangle.Y),
					Size = new Size(radiusX, radiusY),
					SweepDirection = SweepDirection.Clockwise,
					IsLargeArc = false
				}
			);
			
			var path = new PathGeometry ();
			path.Figures.Add (figure);			
		}
Ejemplo n.º 4
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		public Shape ()
		{
			StrokeThickness = 1;
			Stroke = Colors.Black;
			Fill = Brushes.Transparent;
		}
		public abstract void DrawGeometry (Brush brush, Pen pen, Geometry geometry);	
		public abstract void DrawRoundedRectangle (Brush brush, Pen pen, Rect rectangle, double radiusX, double radiusY);
		public abstract void DrawRectangle (Brush brush, Pen pen, Rect rectangle);
		public abstract void DrawEllipse (Brush brush, Pen pen, Point center, double radiusX, double radiusY);