int surface(float xmin,float xmax, float ymin,float ymax, float zmin,float zmax, int xminw,int xmaxw,int yminw,int ymaxw, int hmax,float **z, float horangle,float elangle, int nx,int ny,int box, int fillcolor,int edgecolor,int boxedgecol, void far csetfunc(int color), void far linefunc(int x1,int y1,int x2,int y2));