www.pudn.com > CG2Programs.rar > bicycle.c

/* bicycle, Chapter 7, p. 267-68 */

#include "graphics.h"

/* EXAMPLE STARTS HERE */
void main ()
{
  enum { Frame, Wheel, Bicycle };
  int nPts;
  wcPt2 pts[256];
  pMatrix3 m;
  /* Routines to generate geometry */
  extern void getWheelVertices (int * nPts, wcPt2 pts);
  extern void getFrameVertices (int * nPts, wcPt2 pts);

  /* Make the wheel structure */
  getWheelVertices (nPts, pts);
  openStructure (Wheel);
  setLineWidth (2.0);
  polyline (nPts, pts);
  closeStructure;
  /* Make the frame structure */
  getFrameVertices (nPts, pts);  
  openStructure (Frame);
  setLineWidth (2.0);
  polyline (nPts, pts);
  closeStructure;
  
  /* Make the bicycle */
  openStructure (Bicycle);
  /* Include the frame */
  executeStructure (Frame);
  /* Position and include rear wheel */
  matrixSetIdentity (m);
  m[0,2] := -1.0; m[1,2] := -0.5;
  setLocalTransformationMatrix (m, REPLACE);
  executeStructure (Wheel);
  /* Position and include front wheel */
  m[0,2] :=  1.0; m[1,2] := -0.5;
  setLocalTransformationmatrix (m, REPLACE);
  executeStructure (Wheel);
  closeStructure;
}
/* EXAMPLE ENDS HERE */