#559 – Drawing a Masked Gradient in Blend

You can use an opacity mask with simple shapes along with a gradient to get a style that looks like a gradient applied to a paper cutout.  For example, you might want the following cloud-like effect.

To do this, start with a Rectangle and use a linear gradient for its Fill property.

    	<Rectangle Height="400" Stroke="Black" Width="600">
    	    <Rectangle.Fill>
    	        <LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0">
    		    <GradientStop Color="#FFFBFBFB" Offset="0.504"/>
    		    <GradientStop Color="#FFD6E1EA" Offset="0.734"/>
    		    <GradientStop Color="#FF6EB5F5" Offset="1"/>
    		</LinearGradientBrush>
 	    </Rectangle.Fill>
        </Rectangle>

Now create an image with the shape of the clouds, using an opaque foreground (black in this example) and a transparent background (shown as checkerboard here).

Finally, use the new clouds image as an ImageBrush for the OpacityMask of the Rectangle.

<Rectangle Height="400" Stroke="Black" Width="600">
    <Rectangle.Fill>
        <LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0">
            <GradientStop Color="#FFFBFBFB" Offset="0.504"/>
            <GradientStop Color="#FF6EB5F5" Offset="1"/>
            <GradientStop Color="#FFD6E1EA" Offset="0.734"/>
        </LinearGradientBrush>
    </Rectangle.Fill>
    <Rectangle.OpacityMask>
        <ImageBrush ImageSource="Images\CloudsMask.png"/>
    </Rectangle.OpacityMask>
</Rectangle>
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About Sean
Software developer in the Twin Cities area, passionate about software development and sailing.

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