class wcPt2D {
      public:
         GLfloat x, y;
   };

   void translatePolygon (wcPt2D * verts, GLint nVerts, GLfloat tx, GLfloat ty)
   {
      GLint k;

      for (k = 0; k < nVerts; k++) {
         verts [k].x = verts [k].x + tx;
         verts [k].y = verts [k].y + ty;
      }
      glBegin (GL_POLYGON);
         for (k = 0; k < nVerts; k++)
            glVertex2f (verts [k].x, verts [k].y);
      glEnd ( );
   }