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POTiling rectangles seamlessly in WPF
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  1. POTiling rectangles seamlessly in WPF
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    copied!<p>I want to seamlessly tile a bunch of different-colored Rectangles in WPF. That is, I want to put a bunch of rectangles edge-to-edge, and not have gaps between them.</p> <p>If everything is aligned to pixels, this works fine. But I also want to support arbitrary zoom, and ideally, I don't want to use SnapsToDevicePixels (because it would compromise quality when the image is zoomed way out). But that means my Rectangles sometimes render with gaps. For example:</p> <pre><code>&lt;Page xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Background="Black"&gt; &lt;Canvas SnapsToDevicePixels="False"&gt; &lt;Canvas.RenderTransform&gt; &lt;ScaleTransform ScaleX="0.5" ScaleY="0.5"/&gt; &lt;/Canvas.RenderTransform&gt; &lt;Rectangle Canvas.Left="25" Width="100" Height="100" Fill="#CFC"/&gt; &lt;Rectangle Canvas.Left="125" Width="100" Height="100" Fill="#CCF"/&gt; &lt;/Canvas&gt; &lt;/Page&gt; </code></pre> <p>If the ScaleTransform's ScaleX is 1, then the Rectangles fit together seamlessly. When it's 0.5, there's a dark gray streak between them. I understand why -- the combined semi-transparent edge pixels don't combine to be 100% opaque. But I would like a way to fix it.</p> <p>I could always just make the Rectangles overlap, but I won't always know in advance what patterns they'll be in (this is for a game that will eventually support a map editor). Besides, this would cause artifacts around the overlap area when things were zoomed way <em>in</em> (unless I did bevel-cut angles on the underlapping portion, which is an awful lot of work, and still causes problems at corners).</p> <p>Is there some way I can combine these Rectangles into a single combined "shape" that does render without internal gaps? I've played around with GeometryDrawing, which does exactly that, but then I don't see a way to paint each RectangleGeometry with a different-colored brush.</p> <p>Are there any other ways to get shapes to tile seamlessly under an arbitrary transform, without resorting to SnapsToDevicePixels?</p>
 

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