Method line_circle

Sees if a line intersects with the circumference of a circle. @param x0 @param y0 @param x1 @param y1 @param cx centre of circle x position @param cy centre of circle y position @param r radius of circle @return true if the line intersects the circle else false

(double x0, double y0, double x1, double y1, double cx, double cy, double r)