Points in raterizing layer about mapsui HOT 3 CLOSED

I will have a look at the Gdi renderer this week. It is not up to date to the new way of rendering. I will add a test project for it.

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I added a test project for gdi:
https://github.com/pauldendulk/Mapsui/tree/master/Tests/Mapsui.Rendering.Gdi.Tests
I Refactored GdiRendering somewhat and added basic drawing of vector symbols (circle and rectangle with fill but no outline). There are still a lot of open ends.

You can run the test projects as an application (F5 from VS) or as a nunit test project where it compares output bitmaps to original bitmaps. You can compare those bitmap results with what you get if you run the xaml rendering tests.

Btw. GDI might become more relevant because Xamarin will be releasing a PCL (using bait and switch) for System.Drawing:
https://www.youtube.com/watch?v=Gpqc2XZIQfU#t=1438

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Added some notes on the rendering tests:
https://github.com/pauldendulk/Mapsui/wiki/Rendering-Tests

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