Drawing a bitmap in a circle?

[BergChristian]

Hi!

Great lib. Just starting to convert my controls to use this. Love it!

I am trying to draw a bitmap inside a circle. Would that be possible?

Thanks Christian

[jingwood]

Thanks! Hope this lib helps you. Do you mean draw a masked bitmap? I think it is easy by making some improvements, I will take a look.

[BergChristian]

Hi, Yes

In GDI+ I can create a brush and then fill a circle with that brush to paint an image inside the circle (or really any path). Looking for something similar here.

Right now it is only a circle which I need :).

[jingwood]

Now some APIs to support this have been added.

Direct2D uses layers to make clipping mask, for an ellipse mask, you can use the following code:

protected override void OnRender(D2DGraphics g)
{
  // create an ellipse geometry, which is the clipping target region
  using (var path = this.Device.CreateEllipseGeometry(ellipseOrigin, ellipseSize))
  {
    // push a layer to apply the clip mask
    using (var layer = g.PushLayer(path))
    {
      // draw masked content, ---- start from here -----
      g.FillRectangle(ClientRectangle, new D2DColor(.7f, .7f, .7f));

      g.DrawText("Text drawed via Direct2D API (d2dlib)", D2DColor.Blue, "Arial", 24, 140, 180);
      // masked content, ---- end at here ----

      // finally pop the layer to exit the mask rendering
      g.PopLayer();
    }
  }
}

Full example source code

There is the result:

[BergChristian]

Thanks! That is really awesome! I guess it can be used for other geometrical As well such as a rounded rectangle?

anyway. Love this lib and when and if I can contribute I will do my best!

[jingwood]

Glad to hear that!

Yes, any path geometries are supported. You can also combine multiple paths by pushing nested layers.

Any contributions are welcome, feel free to share it!