Reflection.cpp

#include<iostream>
#include<graphics.h>
#include<math.h>
#include<process.h>
using namespace std;
float b[10][3],a[10][3];
void dispp(int n, float c[][3])
{
    float maxx, maxy;
    int i;
    maxx= getmaxx();
    maxy= getmaxy();
    maxx/=2;
    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(15);
    line(0, maxy, maxx*2,maxy);
    line(maxx,0,maxx,maxy*2);
    setcolor(WHITE);
}
void mull(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]+=c[i][k]*b[k][j];
    }
}
void reflection(int n, float c[][3])
{
    int i=0,ch,j;
    printf("\n1.X AXIS\n2.Y AXIS\n3.ORIGIN\n4.X=Y\n5.-X=Y\n");
    scanf("%d",&ch);
    dispp(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;
            default : break;
    }
    
    mull(n,b,c,a);
    setcolor(WHITE);
    dispp(n,a);
}
int main2()
{
        int i,j,k,cho,n,gd=DETECT,gm;
        float c[10][3],tx,ty,sx,sy,ra;
        initgraph(&gd,&gm,"");
        printf("Enter number of vertices\n");
        scanf("%d",&n);
        for(i=0;i<n;i++)
        {
            printf("Enter coordinates of %d vertex \n",i+1);
            scanf("%f%f",&c[i][0],&c[i][1]);
            c[i][2]=1;
        }
        setcolor(BLUE);
        dispp(n,c);
        reflection(n,c);
        getch();
        return 0;
}