public static void SpiralLoop(int width, int height, TwoDimLoopHandler handler)
{
int x, y, dx, dy;
x = y = dx = 0;
dy = -1;
int t = width > height ? width : height;
int maxI = t * t;
for (int i = 0; i < maxI; i++)
{
if ((-width / 2 <= x) && (x <= width / 2) && (-height / 2 <= y) && (y <= height / 2))
{
if (!handler(x, y))
{
break;
}
}
if ((x == y) || ((x < 0) && (x == -y)) || ((x > 0) && (x == 1 - y)))
{
t = dx;
dx = -dy;
dy = t;
}
x += dx;
y += dy;
}
}
public static void SpiralLoop(int xCenter,
int yCenter,
int width,
int height,
TwoDimLoopHandler handler)
{
SpiralLoop(
width,
height,
(x, y) => handler(xCenter + x, yCenter + y));
}
public static void SpiralLoop(int xCenter, int yCenter, int width, int height, TwoDimLoopHandler handler)
{
SpiralLoop(width, height, delegate(int x, int y) {
return(handler(xCenter + x, yCenter + y));
});
}
