C#•3y ago

Drawing Borders Between Provinces

I am working with maps; WriteableBitmap images that i'm shifting around, manipulating and etc. I am trying to implement a new version of a map but i don't necessarily know how. I have a map as such

2 Replies

LukeZurg22OP•3y ago

and I am trying to reach this state.

LukeZurg22OP•3y ago

This is the closest, simplest code that I have already existing to act as context for what I am trying to do:

        public unsafe WriteableBitmap DrawSelectedProvince(WriteableBitmap image, uint color)
        {
            image.Lock();
            var pixels = (uint*)image.BackBuffer;
            var pixelCount = image.PixelWidth * image.PixelHeight;

            Parallel.For(0, pixelCount, (index) =>
            {
                var rawPixel = pixels[index];

                if (rawPixel == color)
                    pixels[index] = GetRawColor(Colors.WhiteSmoke);
                else
                    pixels[index] = 0;
            });

            image.Unlock();
            return image;
        }

        public unsafe WriteableBitmap DrawSelectedProvince(WriteableBitmap image, uint color)
        {
            image.Lock();
            var pixels = (uint*)image.BackBuffer;
            var pixelCount = image.PixelWidth * image.PixelHeight;

            Parallel.For(0, pixelCount, (index) =>
            {
                var rawPixel = pixels[index];

                if (rawPixel == color)
                    pixels[index] = GetRawColor(Colors.WhiteSmoke);
                else
                    pixels[index] = 0;
            });

            image.Unlock();
            return image;
        }

My hopes are to get this black-border completely separate from the province colours; creating a new WriteableBitmap that is filled with these borders but devoid if the original image's colours.

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Drawing Borders Between Provinces