public static bool CircleToRectangle(Circle a, Rectangle b)
{
double dmin = 0;
double[] C = new double[] { a.cX, a.cY };
double[] Bmin = new double[] { b.X, b.Y };
double[] Bmax = new double[] { b.X + b.W, b.Y + b.H };
for (int i = 0; i < C.Length; i++)
{
if (C[i] < Bmin[i]) dmin += (C[i] - Bmin[i]) * (C[i] - Bmin[i]);
else if (C[i] > Bmax[i]) dmin += (C[i] - Bmax[i]) * (C[i] - Bmax[i]);
}
return dmin <= a.R * a.R;
}
public static bool RectangleToRectangle(Rectangle a, Rectangle b)
{
if (b == null) return false;
return MathUtil.CheckAxis(a.X, a.X + a.W, b.X, b.X + b.W) &&
MathUtil.CheckAxis(a.Y, a.Y + a.H, b.Y, b.Y + b.H);
}