2 DIMENSIONAL ROTATION

2 DIMENSIONAL ROTATION

#include<math.h>

#include<stdlib.h>

#include<stdio.h>

#include<conio.h>

#include<graphics.h>

float px[10],py[10],tx[10],ty[10];

void disp1();

void disp2();

void translation();

void scaling();

void rotation();

int vertices;

void main()

{

            int gd=DETECT,gm,i;

            initgraph(&gd,&gm,"");

            if(graphresult()!=grOk)

            {

                        printf("Graphics error");

                         getch();

                         return;

            }

            printf("Enter number of vertices : ");

            scanf("%d",&vertices);

            printf("Enter the x and y coordinates : ");

            for(i=0;i<vertices;i++)

            {

                         scanf("%f%f",&px[i],&py[i]);

            }

            disp1();

            rotation();

            disp2();

            getch();

            return;

}

void disp1()

{

            int i;

            for(i=0;i<vertices-1;i++)

            {

                        line(px[i],py[i],px[i+1],py[i+1]);

                        line(px[vertices-1],py[vertices-1],px[0],py[0]);

            }

}

void disp2()

{

            int i;

            for(i=0;i<vertices-1;i++)

            {

                        line(tx[i],ty[i],tx[i+1],ty[i+1]);

                        line(tx[vertices-1],ty[vertices-1],tx[0],ty[0]);

            }

}

void rotation()

{

            float a,rx,ry,dir,s;

            int i;

            printf("Enter the rotation angle : ");

            scanf("%f",&a);

            printf("Enter the rotation point coordinates : ");

            scanf("%f%f",&rx,&ry);

            printf("Enter the direction of rotation 1 for clockwise and  2 for anticlockwise:");

            scanf("%f",&dir);

            if(dir==1)

                        s=1;

            else

                        s=-1;

            for(i=0;i<vertices;i++)

            {

                         tx[i]=(rx + (px[i]-rx)*cos(a) - (py[i]-ry)*sin(a)*s);

                         ty[i]=(ry + (px[i]-rx)*sin(a)*s + (py[i]-ry)*cos(a));

            }

            getch();

}

2 DIMENSIONAL ROTATION

OUTPUT:-

Enter the number of vertices:3

Enter the coordinate 1: 100 200

Enter the coordinate 2: 200 200

Enter the coordinate 3: 200 200

Enter the rotation angle: 90

Enter the rotation point: 200 200

Enter the direction (1.Clockwise 2.Anti Clockwise) : 1