2D Transformations: Translation, Scaling, Rotation
C++ program - Graphics & Multimedia Lab
Sourcecode:
#include<graphics.h>
#include<iostream>
#include<math.h>
#include<stdio.h>
using namespace std;
void translate();
void scale();
void rotate();
int main()
{
int gd=DETECT,gm,ch,exitp=0;
initgraph(&gd,&gm,NULL);
int x0,x1,y0,y1;
FILE *ip;
ip=fopen("2Dip.txt","r");
fscanf(ip,"%d %d %d %d",&x0,&y0,&x1,&y1);
rectangle(x0,y0,x1,y1);
fclose(ip);
translate();
scale();
rotate();
getch();
closegraph();
return 0;
}
void translate()
{
int x0,x1,y0,y1;
FILE *op,*ip1,*ip2;
ip1=fopen("2Dip.txt","r");
fscanf(ip1,"%d %d %d %d",&x0,&y0,&x1,&y1);
setcolor(1);
fclose(ip1);
int tx,ty;
ip2=fopen("2Dtransip.txt","r");
fscanf(ip2,"%d %d",&tx,&ty);
fclose(ip2);
op=fopen("2Dop.txt","a+");
rectangle(x0+tx,y0+ty,x1+tx,y1+ty);
outtextxy((x0+tx+20),(y0+ty+20),(char*)"Translation");
fprintf(op,"\nTranslation:\n");
fprintf(op,"%d %d %d %d",x0+tx,y0+ty,x1+tx,y1+ty);
fclose(op);
}
void scale()
{
int x0,x1,y0,y1;
FILE *op,*ip1,*ip2;
int sx,sy;
setcolor(2);
ip1=fopen("2Dip.txt","r");
fscanf(ip1,"%d %d %d %d",&x0,&y0,&x1,&y1);
fclose(ip1);
ip2=fopen("scaleip.txt","r");
fscanf(ip2,"%d %d",&sx,&sy);
op=fopen("2Dop.txt","a+");
fclose(ip2);
outtextxy(x0*sx+20,y0*sy+20,(char*)"Scaling");
rectangle(x0*sx,y0*sy,x1*sx,y1*sy);
fprintf(op,"\nSclaing:\n");
fprintf(op,"%d %d %d %d",x0*sx,y0*sy,x1*sx,y1*sy);
fclose(op);
}
void rotate()
{
setcolor(3);
FILE *op,*ip1,*ip2;
float theta;
int x0,x1,x2,x3,x4;
int y0,y1,y2,y3,y4;
int ax1,ax2,ax3,ax4,ay1,ay2,ay3,ay4;
int refx,refy;
ip1=fopen("2Dip.txt","r");
fscanf(ip1,"%d %d %d %d",&x0,&y0,&x1,&y1);
fclose(ip1);
ip2=fopen("Rotip.txt","r");
fscanf(ip2,"%f",theta);
fclose(ip2);
op=fopen("2Dop.txt","a+");
theta=theta*(3.14/180);
fprintf(op,"\nRotation:\n");
refx=100;
refy=100;
ax1=refy+(x0-refx)*cos(theta)-(y1-refy)*sin(theta);
ay1=refy+(x0-refx)*sin(theta)+(y1-refy)*cos(theta);
ax2=refy+(x1-refx)*cos(theta)-(y1-refy)*sin(theta);
ay2=refy+(x1-refx)*sin(theta)+(y1-refy)*cos(theta);
ax3=refy+(x1-refx)*cos(theta)-(y0-refy)*sin(theta);
ay3=refy+(x1-refx)*sin(theta)+(y0-refy)*cos(theta);
ax4=refy+(x0-refx)*cos(theta)-(y0-refy)*sin(theta);
ay4=refy+(x0-refx)*sin(theta)+(y0-refy)*cos(theta);
line(ax1,ay1,ax2,ay2);
fprintf(op,"%d %d %d %d\n",ax1,ay1,ax2,ay2);
line(ax2,ay2,ax3,ay3);
fprintf(op,"%d %d %d %d\n",ax2,ay2,ax3,ay3);
line(ax3,ay3,ax4,ay4);
fprintf(op,"%d %d %d %d\n",ax3,ay3,ax4,ay4);
line(ax4,ay4,ax1,ay1);
fprintf(op,"%d %d %d %d\n",ax4,ay4,ax1,ay1);
fclose(op);
outtextxy(ax1+20,ay1+20,(char*)"Rotation ");
}
Output:
nn@linuxmint ~ $ g++ lab6.cpp -lgraph nn@linuxmint ~ $ ./a.out
"2Dip.txt"
50 60 100 75
"2Dtransip.txt"
250 250
"scaleip.txt"
3 3
"Rotip.txt"
90.0
"2Dop.txt"
Translation: 300 310 350 325 Sclaing: 150 180 300 225 Rotation: 124 49 124 99 124 99 139 99 139 99 139 49 139 49 124 49
