To perform Rotation Transformation on a figure w.r.t. Origin.

#include"z:\headr.h"

#include<iostream.h>

#include<graphics.h>

#include<conio.h>

int v[3][3];

int r[3][3];

float rt[3][3];

void main()

{

  int gd = DETECT, gm;

  initgraph(&gd, &gm, "");

  vm(v);

  tdsp(v);

  getch();

  // ROTATION WITH RESPECT TO ORIGIN

  setcolor(10);

  rotate(30,rt);

  matmul(v, rt, r);

  tdsp(r);

  getch();

  closegraph();

}                    

 OUTPUT: