private static int ComputeOutCode(float x, float y, float minX, float minY, float maxX, float maxY)
{
int code = 0;
if (x.ApproxEqual(minX) || x.ApproxEqual(maxX))
{
}
else if (x < minX)
{
code |= 0x1;
}
else if (x > maxX)
{
code |= 0x2;
}
if (y.ApproxEqual(minY) || x.ApproxEqual(maxY))
{
}
else if (y < minY)
{
code |= 0x4;
}
else if (y > maxY)
{
code |= 0x8;
}
return(code);
}
public static float IntersectParabolaX(float focus1X, float focus1Y, float focus2X, float focus2Y,
float directrix)
{
//admittedly this is pure voodoo.
//there is attached documentation for this function
return(focus1Y.ApproxEqual(focus2Y)
? (focus1X + focus2X) / 2
: (focus1X * (directrix - focus2Y) + focus2X * (focus1Y - directrix) +
(float)Math.Sqrt((directrix - focus1Y) * (directrix - focus2Y) *
((focus1X - focus2X) * (focus1X - focus2X) +
(focus1Y - focus2Y) * (focus1Y - focus2Y))
)
) / (focus1Y - focus2Y));
}
public static bool ApproxLessThanOrEqualTo(this float value1, float value2)
{
return(value1 < value2 || value1.ApproxEqual(value2));
}
public static bool ApproxGreaterThanOrEqualTo(this float value1, float value2)
{
return(value1 > value2 || value1.ApproxEqual(value2));
}