void
       swf_shapecurveto3
       (float 
       x1, float 
       y1, float 
       x2, float 
       y2, float 
       x3, float 
       y3)
Draw a cubic bezier curve using the x,y coordinate pairs x1, y1 and x2,y2 as off curve control points and the x,y coordinate x3, y3 as an endpoint. The current position is then set to the x,y coordinate pair given by x3,y3.