49 lines
2.6 KiB
Plaintext
49 lines
2.6 KiB
Plaintext
/// <summary>
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/// Draws a circle.
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/// </summary>
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/// <param name="image">
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/// The destination image.
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/// </param>
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/// <param name="centerX">
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/// The x center position of the circle.
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/// </param>
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/// <param name="centerY">
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/// The y center position of the circle.
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/// </param>
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/// <param name="radius">
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/// The radius of the circle.
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/// </param>
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/// <param name="color">
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/// The color to use.
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/// </param>
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public static void DrawCircle(this GenericImage image, int centerX, int centerY, int radius, Color color)
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{
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int d = (5 - radius * 4) / 4;
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int x = 0;
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int y = radius;
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do
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{
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// ensure index is in range before setting (depends on your image implementation)
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// in this case we check if the pixel location is within the bounds of the image before setting the pixel
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if (centerX + x >= 0 && centerX + x <= image.Width - 1 && centerY + y >= 0 && centerY + y <= image.Height - 1) image[centerX + x, centerY + y] = color;
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if (centerX + x >= 0 && centerX + x <= image.Width - 1 && centerY - y >= 0 && centerY - y <= image.Height - 1) image[centerX + x, centerY - y] = color;
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if (centerX - x >= 0 && centerX - x <= image.Width - 1 && centerY + y >= 0 && centerY + y <= image.Height - 1) image[centerX - x, centerY + y] = color;
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if (centerX - x >= 0 && centerX - x <= image.Width - 1 && centerY - y >= 0 && centerY - y <= image.Height - 1) image[centerX - x, centerY - y] = color;
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if (centerX + y >= 0 && centerX + y <= image.Width - 1 && centerY + x >= 0 && centerY + x <= image.Height - 1) image[centerX + y, centerY + x] = color;
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if (centerX + y >= 0 && centerX + y <= image.Width - 1 && centerY - x >= 0 && centerY - x <= image.Height - 1) image[centerX + y, centerY - x] = color;
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if (centerX - y >= 0 && centerX - y <= image.Width - 1 && centerY + x >= 0 && centerY + x <= image.Height - 1) image[centerX - y, centerY + x] = color;
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if (centerX - y >= 0 && centerX - y <= image.Width - 1 && centerY - x >= 0 && centerY - x <= image.Height - 1) image[centerX - y, centerY - x] = color;
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if (d < 0)
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{
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d += 2 * x + 1;
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}
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else
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{
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d += 2 * (x - y) + 1;
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y--;
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}
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x++;
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} while (x <= y);
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}
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