void 
       swf_shapecurveto
       (float 
       x1, float 
       y1, float 
       x2, float 
       y2)
The swf_shapecurveto() function draws a quadratic bezier curve from the x coordinate given by x1 and the y coordinate given by y1 to the x coordinate given by x2 and the y coordinate given by y2. The current position is then set to the x,y coordinates given by the x2 and y2 parameters