public LineMath PerpendicularAtAPointOnLine(Vector3 point)
{
LineMath lm = new LineMath();
// TODO Check if it on the line
lm.p1 = point;
if (IsNaNorIsInfinity(m))
{
var x = point.x + 1;
var z = point.z;
lm.p2 = new Vector3(x, point.y, z);
return(lm);
}
else if (m != 0)
{
var perpM = -1 / m;
var perpB = point.z - point.x * perpM;
var x = point.x + 5;
var z = perpM * x + perpB;
lm.p2 = new Vector3(x, point.y, z);
return(lm);
}
else
{
var x = point.x;
var z = point.z + 1;
lm.p2 = new Vector3(x, point.y, z);
return(lm);
}
}
public Vector3 Intersect(LineMath secondLine)
{
if (IsNaNorIsInfinity(m) && IsNaNorIsInfinity(secondLine.m)) // x=a1 and x=a2
{
// check if they are the same line, or parallel and have no intersection.
if (p1.x == secondLine.p1.x)
{
// Same line, return either end of first line, or start of the second line
return(p2);
}
else
{
return(new Vector3(float.NaN, float.NaN, float.NaN));
}
}
else if (IsNaNorIsInfinity(m))
{
return(new Vector3(p1.x, p1.y, p1.x * secondLine.m + secondLine.b));
}
else if (IsNaNorIsInfinity(secondLine.m))
{
return(new Vector3(secondLine.p1.x, secondLine.p1.y, secondLine.p1.x * m + b));
}
else if (m == secondLine.m)
{
if (b == secondLine.b)
{
// Same line, return either end of first line, or start of the second line
return(p2);
}
else
{
return(new Vector3(float.NaN, float.NaN, float.NaN));
}
}
var intersectionX = (secondLine.b - b) / (m - secondLine.m);
var intersectionZ = m * intersectionX + b;
Vector3 intersection = new Vector3(intersectionX, p1.y, intersectionZ);
return(intersection);
}
