Create house and perform operations

Write a C Program to create house and perform operations in Graphics. Here’s simple C Program to create house and perform operations in Graphics in C Programming Language.

C Program to create a house like figure and perform the following operations.

a. Scaling about the origin followed by translation.

b. Scaling with reference to an arbitrary point.

c. Reflect about the line y = mx + c.

Below is the source code for C Program to create house and perform operations in Graphics which is successfully compiled and run on Windows System to produce desired output as shown below :

SOURCE CODE : :

/*  C Program to create house and perform operations in Graphics  */

#include <stdio.h>
#include <graphics.h>
#include <stdlib.h>
#include <math.h>
#include <conio.h>
 
void reset (int h[][2])
{
    int val[9][2] = {
                        { 50, 50 },{ 75, 50 },{ 75, 75 },{ 100, 75 },
                        { 100, 50 },{ 125, 50 },{ 125, 100 },{ 87, 125 },{ 50, 100 }
                    };
    int i;
    for (i=0; i<9; i++)
    {
        h[i][0] = val[i][0]-50;
        h[i][1] = val[i][1]-50;
    }
}
void draw (int h[][2])
{
    int i;
    setlinestyle (DOTTED_LINE, 0, 1);
    line (320, 0, 320, 480);
    line (0, 240, 640, 240);
    setlinestyle (SOLID_LINE, 0, 1);
    for (i=0; i<8; i++)
        line (320+h[i][0], 240-h[i][1], 320+h[i+1][0], 240-h[i+1][1]);
    line (320+h[0][0], 240-h[0][1], 320+h[8][0], 240-h[8][1]);
}
void rotate (int h[][2], float angle)
{
    int i;
    for (i=0; i<9; i++)
    {
        int xnew, ynew;
        xnew = h[i][0] * cos (angle) - h[i][1] * sin (angle);
        ynew = h[i][0] * sin (angle) + h[i][1] * cos (angle);
        h[i][0] = xnew; h[i][1] = ynew;
    }
}
void scale (int h[][2], int sx, int sy)
{
    int i;
    for (i=0; i<9; i++)
    {
        h[i][0] *= sx;
        h[i][1] *= sy;
    }
}
void translate (int h[][2], int dx, int dy)
{
    int i;
    for (i=0; i<9; i++)
    {
        h[i][0] += dx;
        h[i][1] += dy;
    }
}
void reflect (int h[][2], int m, int c)
{
        int i;
        float angle;
        for (i=0; i<9; i++)
                h[i][1] -= c;
        angle = M_PI/2 - atan (m);
        rotate (h, angle);
        for (i=0; i<9; i++)
                h[i][0] = -h[i][0];
        angle = -angle;
        rotate (h, angle);
        for (i=0; i<9; i++)
                h[i][1] += c;
}
 
void ini()
{
        int gd=DETECT,gm;
        initgraph(&gd,&gm,"..\\bgi");
}
void dini()
{
        getch();
        closegraph();
}
void main()
{
 
        int h[9][2],sx,sy,x,y,m,c,choice;
        do
        {
                clrscr();
                printf("1. Scaling about the origin.\n");
                printf("2. Scaling about an arbitrary point.\n");
                printf("3. Reflection about the line y = mx + c.\n");
                printf("4. Exit\n");
                printf("Enter the choice: ");
                scanf("%d",&choice);
                switch(choice)
                {
                        case 1: printf ("Enter the x- and y-scaling factors: ");
                                scanf ("%d%d", &sx, &sy);
                                ini();
                                reset (h);
                                draw (h);getch();
                                scale (h, sx, sy);
                                cleardevice();
                                draw (h);
                                dini();
                                break;
 
                        case 2: printf ("Enter the x- and y-scaling factors: ");
                                scanf ("%d%d", &sx, &sy);
                                printf ("Enter the x- and y-coordinates of the point: ");
                                scanf ("%d%d", &x, &y);
                                ini();
                                reset (h);
                                translate (h, x, y);// Go to arbitrary point
                                draw(h); getch();//Show its arbitrary position
                                cleardevice();
                                translate(h,-x,-y);//Take it back to origin
                                draw(h);
                                getch();
                                cleardevice();
                                scale (h, sx, sy);//Now Scale it
                                draw(h);
                                getch();
                                translate (h, x, y);//Back to Arbitrary point
                                cleardevice();
                                draw (h);
                                putpixel (320+x, 240-y, WHITE);
                                dini();
                                break;
 
                        case 3: printf ("Enter the values of m and c: ");
                                scanf ("%d%d", &m, &c);
                                ini();
                                reset (h);
                                draw (h); getch();
                                reflect (h, m, c);
                                cleardevice();
                                draw (h);
                                dini();
                                break;
 
                        case 4: exit(0);
                }
        }while(choice!=4);
}

Above is the source code for C Program to create house and perform operations in Graphics which is successfully compiled and run on Windows System.The Output of the program is shown above .

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