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//   Program project
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#include <stdio.h>
#include "nxgraph.h"

//---- physical setting
#define G          (9.80665)
#define M          (1.0)
#define dT         (1.0/256)

//---- graphic setting
#define WIN_WIDTH  (256)
#define WIN_HEIGHT (256)


//---- main function
int main(void)
{
  NXOpenWindow("Projection Motion", WIN_WIDTH, WIN_HEIGHT );

  double qx=0.0, qy=0.0;
  double px=1.0, py=2.0;

  do{
    NXDrawPoint( (int)(512*qx), WIN_HEIGHT-(int)(512*qy) );
    qx += px/M*dT;
    qy += py/M*dT;
    px +=  M*0*dT;
    py += -M*G*dT;
  }while( qy > 0.0 );

  XEvent ev;
  NXCheckEvent( NX_WAIT, ev );
  NXCloseWindow();

  return(0);
}