Vista - Drawing Polygon on UserControl

05-03-2007

Hello Everybody,

I am writing WPF UserControl using C#.
This UserControl will draw image and do some animations.

Now for drawing images, i am getting image from other source as XAML data.
This XAML data contains full of PolyLines,Polygons and Ellipses. I wanted to
draw each of this element on UserControl's DrawingContext by overriding
OnRender(). Correct me if there is any better way.

I think i can draw PolyLines and Ellipse using PathGeomentry.
But how to draw Polygon on DrawingContext?
Or is there anyother better way of doing?

I appreciate your help.
Thanks.

leithi · 02-21-2008

You have to use the DrawGeometry() function. Have a look at: PathFigure Class (System.Windows.Media)

Below is the function I created in my program. Don't ask about the performance of this code though, probably not very good.

Code:

private void renderPolygon(DrawingContext dc, List<Point> points, Brush fillColor, Pen outline)
{
    if (points.Count > 1)
    {
        PathFigure myPathFigure = new PathFigure();
        myPathFigure.StartPoint = points[0];

        PathSegmentCollection myPathSegmentCollection = new PathSegmentCollection();
        for (int i = 1; i < points.Count; i++)
            myPathSegmentCollection.Add(new LineSegment(points[i], true));

        myPathFigure.Segments = myPathSegmentCollection;
        PathGeometry myPathGeometry = new PathGeometry();
        myPathGeometry.Figures.Add(myPathFigure);

        dc.DrawGeometry(fillColor, outline, myPathGeometry);
    }
}

05-03-2007	#1 (permalink)
Sudha n/a posts	Drawing Polygon on UserControl Hello Everybody, I am writing WPF UserControl using C#. This UserControl will draw image and do some animations. Now for drawing images, i am getting image from other source as XAML data. This XAML data contains full of PolyLines,Polygons and Ellipses. I wanted to draw each of this element on UserControl's DrawingContext by overriding OnRender(). Correct me if there is any better way. I think i can draw PolyLines and Ellipse using PathGeomentry. But how to draw Polygon on DrawingContext? Or is there anyother better way of doing? I appreciate your help. Thanks.
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