How to determine if a point is in a 2D triangle? [closed]

Answer 1

Solve the following equation system:

p = p0 + (p1 - p0) * s + (p2 - p0) * t

The point p is inside the triangle if 0 <= s <= 1 and 0 <= t <= 1 and s + t <= 1.

s,t and 1 - s - t are called the barycentric coordinates of the point p.