clip_triangle (double& x1, double& y1, double& x2, double& y2, const double u, const double v, const int clip_xaxis)
{
double m = v / u; // slope of triangle lines
clip_triangle (double& x1, double& y1, double& x2, double& y2, const double u, const double v, const int clip_xaxis)
{
double m = v / u; // slope of triangle lines