Graphics.h Functions Ready

const int MAX = 5;
const double PI = 3.14;

void GetCords(float mat1[][MAX], float mat2[][MAX], int n) {
    int i, j;

    for (i = 0; i < n; i++) {

        printf("\n Enter Coordinate no %d:- \n", i + 1);

        for (j = 0; j < 2; j++) {
            scanf("%f", &mat1[j][i]);
        }
    }

    for (i = 0; i < n; i++) {
        mat2[0][i] = mat1[0][i];
        mat1[0][i] = 320 + mat1[0][i];
        mat2[1][i] = mat1[1][i];
        mat1[1][i] = 240 - mat1[1][i];
    }

    setcolor(GREEN);
    line(0, 240, 640, 240);

    outtextxy(630, 245, "x");

    line(320, 0, 320, 480);

    outtextxy(310, 0, "y");
    outtextxy(280, 245, "(0,0)");

    setcolor(YELLOW);
    moveto(mat1[0][0], mat1[1][0]);

    for (i = 0; i < n; i++) {

        lineto(mat1[0][i], mat1[1][i]);
        moveto(mat1[0][i], mat1[1][i]);
    }
    lineto(mat1[0][0], mat1[1][0]);

}

void Scale(float mat2[][MAX], int n) {
    int sx, sy, i, j, k;
    float tmat[MAX][MAX], tot[MAX][MAX];

    printf("\n Enter the Scale value of x: ");
    scanf("%d", &sx);
    printf("\n Enter the Scale value of y: ");
    scanf("%d", &sy);

    tmat[0][0] = sx;
    tmat[0][1] = 0;
    tmat[1][0] = 0;
    tmat[1][1] = sy;

    for (i = 0; i < 2; i++) {
        for (j = 0; j < n; j++) {

            tot[i][j] = 0;

            for (k = 0; k < 2; k++) {
                tot[i][j] = tot[i][j] + (tmat[i][k] * mat2[k][j]);
            }
        }
    }

    for (i = 0; i < n; i++) {
        tot[0][i] = 320 + tot[0][i];
        tot[1][i] = 240 - tot[1][i];
    }

    setcolor(LIGHTRED);
    moveto(tot[0][0], tot[1][0]);

    for (i = 0; i < n; i++) {

        lineto(tot[0][i], tot[1][i]);
        moveto(tot[0][i], tot[1][i]);
    }
    lineto(tot[0][0], tot[1][0]);
}

void Rotate(float mat2[][MAX], int n) {
    int ang, i, j, k;
    float tmat[MAX][MAX], tot[MAX][MAX];
    float rad;

    printf("\n Enter the Angle (in Degrees):- \n");
    scanf("%d", &ang);

    rad = (ang * PI) / 180;

    tmat[0][0] = cos(rad);
    tmat[0][1] = -sin(rad);
    tmat[1][0] = sin(rad);
    tmat[1][1] = cos(rad);

    for (i = 0; i < 2; i++) {
        for (j = 0; j < n; j++) {

            tot[i][j] = 0;

            for (k = 0; k < 2; k++) {
                tot[i][j] = tot[i][j] + (tmat[i][k] * mat2[k][j]);
            }
        }
    }

    for (i = 0; i < n; i++) {
        tot[0][i] = 320 + tot[0][i];
        tot[1][i] = 240 - tot[1][i];
    }

    setcolor(LIGHTRED);
    moveto(tot[0][0], tot[1][0]);

    for (i = 0; i < n; i++) {

        lineto(tot[0][i], tot[1][i]);
        moveto(tot[0][i], tot[1][i]);
    }

    lineto(tot[0][0], tot[1][0]);
}

void pointRotate(float mat2[][MAX], int n) {
    int ang, i, j, k;
    float tmat[MAX][MAX], tot[MAX][MAX];
    float rad;
    int px, py;

    // Get a Point.
    px = mat2[0][0];
    py = mat2[1][0];

    printf("\n Enter the Angle (in Degrees):- \n");
    scanf("%d", &ang);

    // Inv Translation to Origin.
    for (i = 0; i < n; i++) {
        mat2[0][i] -= px;
        mat2[1][i] -= py;
    }

    // Rotation.
    rad = (ang * PI) / 180;

    tmat[0][0] = cos(rad);
    tmat[0][1] = -sin(rad);
    tmat[1][0] = sin(rad);
    tmat[1][1] = cos(rad);

    for (i = 0; i < 2; i++) {
        for (j = 0; j < n; j++) {

            tot[i][j] = 0;

            for (k = 0; k < 2; k++) {
                tot[i][j] = tot[i][j] + (tmat[i][k] * mat2[k][j]);
            }
        }
    }

    // Translate from the Origin.
    for (i = 0; i < n; i++) {
        tot[0][i] += px;
        tot[1][i] += py;
    }

    for (i = 0; i < n; i++) {
        tot[0][i] = 320 + tot[0][i];
        tot[1][i] = 240 - tot[1][i];
    }

    setcolor(LIGHTRED);
    moveto(tot[0][0], tot[1][0]);

    for (i = 0; i < n; i++) {
        lineto(tot[0][i], tot[1][i]);
        moveto(tot[0][i], tot[1][i]);
    }

    lineto(tot[0][0], tot[1][0]);
}

void Translate(int mat[][MAX], int n) {
    int dx, dy, i;
    printf("\n Enter Cordinates (dx, dy):- \n");
    scanf("%d %d", &dx, &dy);
    for (i = 0; i < n; i++) {
        mat[0][i] += dx;
        mat[1][i] -= dy;
    }

    setcolor(LIGHTRED);
    moveto(mat[0][0], mat[1][0]);
    for (i = 0; i < n; i++) {
        lineto(mat[0][i], mat[1][i]);
        moveto(mat[0][i], mat[1][i]);
    }
    lineto(mat[0][0], mat[1][0]);

}