CG_Practical04.cpp

#include <iostream>
#include <graphics.h>
#include <math.h>
using namespace std;
class transform
{
public:
    int m, a[20][20], c[20][20];
    int i, j, k;

public:
    void object();
    void accept();
    void operator*(float b[20][20])
    {
        for (int i = 0; i < m; i++)
        {
            for (int j = 0; j < m; j++)
            {
                c[i][j] = 0;
                for (int k = 0; k < m; k++)
                {
                    c[i][j] = c[i][j] + (a[i][k] * b[k][j]);
                }
            }
        }
    }
};
void transform::object()
{
    int gd, gm;
    gd = DETECT;
    initgraph(&gd, &gm, NULL);
    line(300, 0, 300, 600);
    line(0, 300, 600, 300);
    for (i = 0; i < m - 1; i++)
    {
        line(300 + a[i][0], 300 - a[i][1], 300 + a[i + 1][0], 300 - a[i + 1][1]);
    }
    line(300 + a[0][0], 300 - a[0][1], 300 + a[i][0], 300 - a[i][1]);
    for (i = 0; i < m - 1; i++)
    {

        line(300 + c[i][0], 300 - c[i][1], 300 + c[i + 1][0], 300 - c[i + 1][1]);
    }
    line(300 + c[0][0], 300 - c[0][1], 300 + c[i][0], 300 - c[i][1]);
    int temp;
    cout << "Press 1 to continue";
    cin >> temp;
    closegraph();
}
void transform::accept()
{
    cout << "\n";
    cout << "Enter the Number Of Edges:";
    cin >> m;
    cout << "\nEnter The Coordinates :";
    for (int i = 0; i < m; i++)
    {
        for (int j = 0; j < 3; j++)
        {
            if (j >= 2)
                a[i][j] = 1;
            else
                cin >> a[i][j];
        }
    }
}
int main()
{
    int ch, tx, ty, sx, sy;
    float deg, theta, b[20][20];
    transform t;
    t.accept();

    cout << "\nEnter your choice";
    cout << "\n1.Translation"
            "\n2.Scaling"
            "\n3.Rotation";
    cin >> ch;
    switch (ch)
    {
    case 1:
        cout << "\nTRANSLATION OPERATION\n";
        cout << "Enter value for tx and ty:";
        cin >> tx >> ty;
        b[0][0] = b[2][2] = b[1][1] = 1;
        b[0][1] = b[0][2] = b[1][0] = b[1][2] = 0;
        b[2][0] = tx;
        b[2][1] = ty;
        t *b;

        t.object();
        break;
    case 2:
        cout << "\nSCALING OPERATION\n";
        cout << "Enter value for sx,sy:";
        cin >> sx >> sy;
        b[0][0] = sx;
        b[1][1] = sy;
        b[0][1] = b[0][2] = b[1][0] = b[1][2] = 0;
        b[2][0] = b[2][1] = 0;
        b[2][2] = 1;
        t *b;
        t.object();
        break;
    case 3:
        cout << "\nROTATION OPERATION\n";
        cout << "Enter value for angle:";
        cin >> deg;
        theta = deg * (3.14 / 100);
        b[0][0] = b[1][1] = cos(theta);
        b[0][1] = sin(theta);
        b[1][0] = sin(-theta);
        b[0][2] = b[1][2] = b[2][0] = b[2][1] = 0;
        b[2][2] = 1;
        t *b;
        t.object();
        break;
    default:
        cout << "\nInvalid choice";
    }

    getch();

    return 0;
}