# Code Snippets #18 - DrawCircle

Published 7/27/2013 by createdbyx in Code Snippets | Programming
Tags: ,

Source (converted from Java) -> http://rosettacode.org/wiki/Bitmap/Midpoint_circle_algorithm#Java

```/// <summary>
/// Draws a circle.
/// </summary>
/// <param name="image">
/// The destination image.
/// </param>
/// <param name="centerX">
/// The x center position of the circle.
/// </param>
/// <param name="centerY">
/// The y center position of the circle.
/// </param>
/// The radius of the circle.
/// </param>
/// <param name="color">
/// The color to use.
/// </param>
public static void DrawCircle<T>(this GenericImage<T> image, int centerX, int centerY, int radius, T color)
{
// source (converted from Java) -> http://rosettacode.org/wiki/Bitmap/Midpoint_circle_algorithm#Java
var d = (5 - radius * 4) / 4;
var x = 0;

do
{
// ensure index is in range before setting (depends on your image implementation)
// in this case we check if the pixel location is within the bounds of the image before setting the pixel
image[centerX + x, centerY + y] = color;
image[centerX + x, centerY - y] = color;
image[centerX - x, centerY + y] = color;
image[centerX - x, centerY - y] = color;
image[centerX + y, centerY + x] = color;
image[centerX + y, centerY - x] = color;
image[centerX - y, centerY + x] = color;
image[centerX - y, centerY - x] = color;
if (d < 0)
{
d += 2 * x + 1;
}
else
{
d += 2 * (x - y) + 1;
y--;
}
x++;
} while (x <= y);
}```

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