Method line_line

See if two lines intersect @param x0 start of line 1 @param y0 start of line 1 @param x1 end of line 1 @param y1 end of line 1 @param x2 start of line 2 @param y2 start of line 2 @param x3 end of line 2 @param y3 end of line 2 @return true if the lines intersect

(double x0, double y0, double x1, double y1, double x2, double y2, double x3, double y3)