How to add effect on CanvasGeometry

Question

It seems to me that all the effects available in Win2D are for drawing image.

What about CanvasGeometry? How do I draw a CanvasGeometry using, say glowing effect ?

Thanks.

Nico Zhu · Accepted Answer · 2018-09-03 03:09:26Z

1

Geometry objects provide a means of drawing and manipulating geometric shapes. It has CreatePolygon,CreatePathmethod could be used to create geometric shapes.

For glowing effect, you could refer this code sample.

private void DoEffect(CanvasDrawingSession ds, Size size, float amount)
{
    size.Width = size.Width - ExpandAmount;
    size.Height = size.Height - ExpandAmount;

    var offset = (float)(ExpandAmount / 2);           

    using (var textLayout = CreateTextLayout(ds, size))
    using (var textCommandList = new CanvasCommandList(ds))
    {
        using (var textDs = textCommandList.CreateDrawingSession())
        {                     
            textDs.DrawTextLayout(textLayout, 0, 0, GlowColor);
        }

         glowEffectGraph.Setup(textCommandList, amount);
         ds.DrawImage(glowEffectGraph.Output, offset, offset);

         ds.DrawTextLayout(textLayout, offset, offset, TextColor);
     }
}

answered Sep 3, 2018 at 3:09

Nico Zhu

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1 Comment

Muzib Over a year ago

Thanks a lot. So, CanvasCommandList did the trick. I was looking for something like it.

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