C Program for 2D Transformation (Translation, Rotation and Scaling)

Program /* This program is for the transformation of 2D shape (Triangle) for other shape edit only shape codes 1. Translation 2. Rotat...

Program

/*
This program is for the transformation of 2D shape (Triangle) for other shape edit only shape codes
1. Translation
2. Rotation
3. Scaling
Here,
x1,x2,x3,y1,y2,y3 variable to draw triangle.
x11,x22,x33,y11,y22,y33 variables are for new position of triangle.
sfx and sfy are scaling factor.
tpx and tpy are for translation point.
ang is for angle for rotation and t variable is use for angle in radian.
a and b is for arbitary point
c for choice/option.
*/

#include <graphics.h>
#include <stdio.h>
#include <conio.h>
#include<math.h>
void main()
{
int gm,gd=DETECT,midx,midy,c;
float x1,x2,x3,y1,y2,y3,x11,x22,x33,y11,y22,y33,sfx,sfy,tpx,tpy,ang,t,a,b;
clrscr();
initgraph(&gd,&gm,"..\\bgi");
midx=getmaxx()/2;
midy=getmaxy()/2;
line(midx,0,midx,getmaxy());
line(0,midy,getmaxx(),midy);
printf("2D Translation, Rotation and Scaling\n");
printf("Enter the points (x1,y1), (x2,y2) and (x3,y3) of triangle\n");
scanf("%f%f%f%f%f%f",&x1,&y1,&x2,&y2,&x3,&y3);
setcolor(WHITE);
line(midx+x1,midy-y1,midx+x2,midy-y2);
line(midx+x2,midy-y2,midx+x3,midy-y3);
line(midx+x3,midy-y3,midx+x1,midy-y1);
printf("\n 1.Transaction\n 2.Rotation\n 3.Scalling\n 4.exit\n");
a:  printf("Enter your choice:");
scanf("%d",&c);
switch(c)
{
case 1:
printf("Enter the translation factor\n");
scanf("%f%f",&tpx,&tpy);
x11=x1+tpx;
y11=y1+tpy;
x22=x2+tpx;
y22=y2+tpy;
x33=x3+tpx;
y33=y3+tpy;
setcolor(RED);
line(midx+x11,midy-y11,midx+x22,midy-y22);
line(midx+x22,midy-y22,midx+x33,midy-y33);
line(midx+x33,midy-y33,midx+x11,midy-y11);
break;

case 2:
printf("Enter the angle of rotation\n");
scanf("%f",&ang);
printf("Enter rotetion point\n");
scanf("%f%f",&a,&b);
t=3.14*ang/180;
x11=abs(x1*cos(t)-y1*sin(t)+a*(1-cos(t))+b*sin(t));
y11=abs(x1*sin(t)+y1*cos(t)+b*(1-cos(t))-a*sin(t));
x22=abs(x2*cos(t)-y2*sin(t)+a*(1-cos(t))+b*sin(t));
y22=abs(x2*sin(t)+y2*cos(t)+b*(1-cos(t))-a*sin(t));
x33=abs(x3*cos(t)-y3*sin(t)+a*(1-cos(t))+b*sin(t));
y33=abs(x3*sin(t)+y3*cos(t)+b*(1-cos(t))-a*sin(t));
setcolor(BLUE);
line(midx+x11,midy-y11,midx+x22,midy-y22);
line(midx+x22,midy-y22,midx+x33,midy-y33);
line(midx+x33,midy-y33,midx+x11,midy-y11);
break;
case 3:
printf("Enter the scalling factor\n");
scanf("%f%f",&sfx,&sfy);
printf("Enter scaling point\n");
scanf("%f%f",&a,&b);
x11=x1*sfx+a*(1-sfx);
y11=y2*sfy+b*(1-sfy);
x22=x2*sfx+a*(1-sfx);
y22=y2*sfy+b*(1-sfy);
x33=x3*sfx+a*(1-sfx);
y33=y3*sfy+b*(1-sfy);
setcolor(YELLOW);
line(midx+x11,midy-y11,midx+x22,midy-y22);
line(midx+x22,midy-y22,midx+x33,midy-y33);
line(midx+x33,midy-y33,midx+x11,midy-y11);
break;

case 4:
exit(0);
break;

default:
printf("Enter the correct choice\n");
}
goto a;
getch();
}

Output