Reflection Sheering in Computer Graphics

Reflection Sheering in Computer Graphics




#include<stdio.h>
#include<process.h>
#include<conio.h>
#include<graphics.h>
#include<math.h>
void disp(int n,float c[][3])
{
float maxx,maxy;
int i;
maxx=getmaxx();
maxy=getmaxy();
maxx=maxx/2;
maxy=maxy/2;
i=0;
while(i<n-1)
{
line(maxx+c[i][0],maxy-c[i][1],maxx+c[i+1][0],maxy-c[i+1][1]);
i++;
}
i=n-1;
line(maxx+c[i][0],maxy-c[i][1],maxx+c[0][0],maxy-c[0][1]);
setcolor(GREEN);
line(0,maxy,maxx*2,maxy);
line(maxx,0,maxx,maxy*2);
setcolor(WHITE);
}
void mul(int n,float b[][3],float c[][3],float a[][3])
{
int i,j,k;
for(i=0;i<n;i++)
for(j=0;j<3;j++)
a[i][j]=0;
for(i=0;i<n;i++)
for(j=0;j<3;j++)
for(k=0;k<3;k++)
{
a[i][j] = a[i][j] + (c[i][k] * b[k][j]);
}
}
void reflection(int n,float c[][3])
{
float b[10][3],a[10][3];
int i=0,ch,j;
cleardevice();
printf(“\n\t* * MENU * *”);
printf(“\n\t1) ABOUT X-AXIS”);
printf(“\n\t2) ABOUT Y-AXIS”);
printf(“\n\t3) ABOUT ORIGIN”);
printf(“\n\t4) ABOUT X=Y”);
printf(“\n\t5) ABOUT -X=Y”);
printf(“\n\t6) EXIT”);
printf(“\n\tENTER YOUR CHOICE :   “);
scanf(“%d”,&ch);
clrscr();
cleardevice();
disp(n,c);
for(i=0;i<3;i++)
for(j=0;j<3;j++)
{
b[i][j]=0;
if(i==j)
b[i][j]=1;
}
switch(ch)
{
case 1:
b[1][1]=-1;
break;
case 2:
b[0][0]=-1;
break;
case 3:
b[0][0]=-1;
b[1][1]=-1;
break;
case 4:
b[0][0]=0;
b[1][1]=0;
b[0][1]=1;
b[1][0]=1;
break;
case 5:
b[0][0]=0;
b[1][1]=0;
b[0][1]=-1;
b[1][0]=-1;
break;
case 6:
break;
default:
printf(“\n\tINVALID CHOICE ! “);
break;
}
mul(n,b,c,a);
setcolor(RED);
disp(n,a);
}
void shearing(int n,float c[][3])
{
float b[10][3],sh,a[10][3];
int i=0,ch,j;
cleardevice();
printf(“\n\t* * * MENU * * *”);
printf(“\n\t1) X SHEARING”);
printf(“\n\t2) Y SHEARING”);
printf(“\n\t3) EXIT “);
printf(“\n\tENTER YOUR CHOICE :   “);
scanf(“%d”,&ch);
if(ch==3)
return;
printf(“\n\tENTER THE VALUE for SHEARING:        “);
scanf(“%f”,&sh);
clrscr();
cleardevice();
for(i=0;i<3;i++)
for(j=0;j<3;j++)
b[i][j]=0;
for(i=0;i<3;i++)
b[i][i]=1;
switch(ch)
{
case 1:
b[1][0]=sh;
break;
case 2:
b[0][1]=sh;
break;
case 3:
break;
default:
printf(“\n\tINVALID CHOICE ! “);
break;
}
mul(n,b,c,a);
setcolor(RED);
disp(n,a);
}
void main()
{
int i,j,k,cho,n,gd=DETECT,gm;
float c[10][3],tx,ty,sx,sy,ra;
initgraph(&gd,&gm,” “);
printf(“\nEnter the number of vertices :   “);
scanf(“%d”,&n);
for(i=0;i<n;i++)
{
printf(“\nEnter the co-ordinates of the %d vertex :”,i+1);
scanf(“%f%f”,&c[i][0],&c[i][1]);
c[i][2]=1;
}
do
{
clrscr();
cleardevice();
printf(“\n\t\t\t * * * MENU * * *”);
printf(“\n\t 1) REFLECTION “);
printf(“\n\t 2) SHEARING”);
printf(“\n\t 3) EXIT”);
printf(“\n\t ENTER YOUR CHOICE:   “);
scanf(“%d”,&cho);
switch(cho)
{
case 1:
clrscr();
cleardevice();
setcolor(BLUE);
disp(n,c);
reflection(n,c);
getch();
break;
case 2:
clrscr();
cleardevice();
setcolor(BLUE);
disp(n,c);
shearing(n,c);
getch();
break;
case 3 :
exit(0);
break;
default:
printf(“\n\tInvalid choice !!”);
break;
}
}while(cho!=3);
getch();
closegraph();
} 




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www.NotesGuru.in, Indore

ROHIT KESHRIYA (MCA),
Software Engineer,
www.NotesGuru.in, Indore

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