To perform Rotation Transformation on figure w.r.t. fixed point.

#include<iostream.h>

#include<conio.h>

#include<graphics.h>

#include "z:\headr.h"

int v[3][3];

int r[3][3];

float rt[3][3];

float rt1[3][3];

float rt2[3][3];

void main()

{

  int gd = DETECT, gm;

  initgraph(&gd, &gm, "");

  vm(v);

  tdsp(v);

  getch();

 // ROTATION WITH RESPECT TO A POINT

  setcolor(4);                  

  trans(-v[0][0], -v[0][1], r);

  rotate(30, rt);

  matmul(r, rt, rt1);

  matmul(rt1, v, rt2);

  tdsp(rt2);

  getch();

  closegraph();

}

    OUTPUT: