ch1_hello_dot.cs

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void Render(Surface dst, Surface src, Rectangle rect)
{
    // Delete any of these lines you don't need
    Rectangle selection = EnvironmentParameters.GetSelection(src.Bounds).GetBoundsInt();
    int CenterX = ((selection.Right - selection.Left) / 2) + selection.Left;
    int CenterY = ((selection.Bottom - selection.Top) / 2) + selection.Top;
    ColorBgra PrimaryColor = EnvironmentParameters.PrimaryColor;

    ColorBgra CurrentPixel;
    for (int y = rect.Top; y < rect.Bottom; y++)
    {
        if (IsCancelRequested) return;
        for (int x = rect.Left; x < rect.Right; x++)
        {
            CurrentPixel = src[x,y];
            if (x == CenterX && y == CenterY) {
                CurrentPixel.R = PrimaryColor.R;
                CurrentPixel.G = PrimaryColor.G;
                CurrentPixel.B = PrimaryColor.B;
                CurrentPixel.A = PrimaryColor.A;
            }
            dst[x,y] = CurrentPixel;
        }
    }
}