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### 2D Transformations 1 program

This program is for implementing Composite 2D Transformations. This is a part of Mumbai University MCA Colleges Computer Graphics CG MCA Sem 2

#include<stdio.h>
#include<conio.h>
#include<graphics.h>
#include<math.h>
#define pi 3.14
int p1[3][3]={0,0,0,0,0,0,0,0,0};
int p[3][3]={0,0,0,0,0,0,1,1,1};
void translate(int p[3][3],int,int);
void scaling(int p[3][3],int,int);
void rotate(int p[3][3],double);
void main()
{
int gd,gm,x1,x2,y1,y2,i,j,choice;
int tx,ty,sx,sy;
double theta;
clrscr();
detectgraph(&gd,&gm);
initgraph(&gd,&gm,"c:\\tc\\bgi");
printf("Enter the co-ordinates of the line\n");
printf("Values of x1 and y1\n");
scanf("%d%d",&p[0][0],&p[1][0]);
printf("Values of x2 and y2\n");
scanf("%d%d",&p[0][1],&p[1][1]);
line(p[0][0],p[1][0],p[0][1],p[1][1]);
while(1)
{
printf("1. Translation\n2. Rotation\n3. Scaling\n4. Exit\n");
scanf("%d",&choice);
switch(choice)
{
case 1:
printf("Enter value of tx and ty\n");
scanf("%d%d",&tx,&ty);
translate(p,tx,ty);
printf("%d %d %d %d",p[0][0],p[0][1],p[1][0],p[1][1]);
line(p[0][0],p[1][0],p[0][1],p[1][1]);
break;
case 2:
printf("Enter values of angle of rotation\n");
scanf("%lf",&theta);
rotate(p,theta);
line(p[0][0],p[1][0],p[0][1],p[1][1]);
break;
case 3:
printf("Enter values of scaling factors\n");
scanf("%d%d",&sx,&sy);
scaling(p,sx,sy);
line(p[0][0],p[1][0],p[0][1],p[1][1]);
break;
case 4:
exit(0);
default:
printf("You entered wrong choice\n");
}
}
}
void copy(int p1[3][3])
{
int i,j;
for(i=0;i<3;i++)
{
for(j=0;j<3;j++)
{
p[i][j]=p1[i][j];
}
}
}
//Scaling
void scaling(int p[3][3],int sx,int sy)
{
int i,j,k;
int s[3][3]={0,0,0,0,0,0,0,0,1};
s[0][0]=sx;
s[1][1]=sy;
for(i=0;i<3;i++)
{
for(j=0;j<3;j++)
{
p1[i][j]=0;
for(k=0;k<3;k++)
{
p1[i][j]+=s[i][k]*p[k][j];
}
}
}
copy(p1);
}

//Translation
void translate(int p[3][3],int tx,int ty)
{
int i,j,k;
int t[3][3]={1,0,0,0,1,0,0,0,1};
t[0][2]=tx;
t[1][2]=ty;
for(i=0;i<3;i++)
{
for(j=0;j<3;j++)
{
p1[i][j]=0;
for(k=0;k<3;k++)
{
p1[i][j]+=t[i][k]*p[k][j];
}
printf("%d\t",p1[i][j]);
}
printf("\n");
}
copy(p1);
}
//Rotation
void rotate(int p[3][3],double theta)
{
int i,j,k;
double st,ct;
double r[3][3]={0,0,0,0,0,0,0,0,1};
st=sin((theta*pi)/180);
ct=cos((theta*pi)/180);
r[0][0]=r[1][1]=ct;
r[0][1]=-st;
r[1][0]=st;
for(i=0;i<3;i++)
{
for(j=0;j<3;j++)
{
p1[i][j]=0;
for(k=0;k<3;k++)
{
p1[i][j]+=r[i][k]*p[k][j];
}
}
}
copy(p1);
}

Hope this Program is useful to you in some sense or other. Keep on following this blog for more Mumbai University MCA College Programs. Happy Programming and Studying.