letters_ftw.py

rp1 = self.rotated_p1
rp2 = self.rotated_p2
rp3 = self.rotated_p3

alpha_numerator = ((rp2[1] - rp3[1])*(intersection_point[0] - rp3[0]) + (rp3[0] - rp2[0])*(intersection_point[1] - rp3[1]))
alpha_denominator = ((rp2[1] - rp3[1])*(rp1[0] - rp3[0]) + (rp3[0] - rp2[0])*(rp1[1] - rp3[1]))
alpha = alpha_numerator / alpha_denominator
beta_numerator = ((rp3[1] - rp1[1])*(intersection_point[0] - rp3[0]) + (rp1[0] - rp3[0])*(intersection_point[1] - rp3[1]))
beta_denominator =  ((rp2[1] - rp3[1])*(rp1[0] - rp3[0]) + (rp3[0] - rp2[0])*(rp1[1] - rp3[1]))
beta = beta_numerator / beta_denominator
gamma = 1.0 - alpha - beta