C Program For Rotation Using graphics.h

C Program For Rotation Of An Object

We have already described what is Rotation in previous posts. Here is the c code using graphics.h library functions.

Follow The Instructions To Successfully Run The Program:

Whenever you #include <graphics.h> in a program, you must instruct the linker to 
link in certain libraries. The command to do so from Dev-C++ is Alt-P. Choose the 
Parameters tab from the pop-up window and type the following into the Linker area:

-lbgi
-lgdi32
-lcomdlg32
-luuid
-loleaut32
-lole32


Note: for loops in the program is written using -std=c99 or -std=gnu99 syntex.

Code

#include <stdio.h>
#include <math.h>
#include <graphics.h>

void print(int a[][3])
{
    for (int i = 0; i < 3; ++i)
    {
        for (int j = 0; j < 3; ++j)
        {
            printf("%d ", a[i][j]);
        }
        printf("\n");
    }

}

void multiply(int a[][3], int b[][3], int c[][3])
{
    int sum = 0;
    for (int i = 0; i < 3; ++i) {
        for (int j = 0; j < 3; ++j) {
            for (int k = 0; k < 3; ++k) {
                sum += (a[i][k] * b[k][j]);
            }
            c[i][j] = sum;
            sum = 0;
        }
    }
}

void rotation(int a[][3])
{
    int deg; 
    float c[3][3], sum = 0.0; 
    float t[3][3];
    printf("Enter The Angel: ");
    scanf("%d",&deg);
        
    t[0][0] = t[1][1] = cos(deg*3.14/180);
    t[0][1] = sin(deg*3.14/180);
    t[1][0] = -t[0][1];
    t[2][2] = 1; t[0][2] = t[2][0] = 0;
    t[2][1] = t[1][2] = 0;
    for (int i = 0; i < 3; ++i)
    {
        for (int j = 0; j < 3; ++j)
        {
            printf("%g ", t[i][j]);
        }
        printf("\n");
    }
    for (int i = 0; i < 3; ++i) {
        for (int j = 0; j < 3; ++j) {
            for (int k = 0; k < 3; ++k) {
                sum += (t[i][k] * a[k][j]);
            }
            c[i][j] = round(sum);
            sum = 0;
        }
    }
    for (int i = 0; i < 3; ++i)
    {
        for (int j = 0; j < 3; ++j)
        {
            printf("%g ", c[i][j]);
        }
        printf("\n");
    }
    line(c[0][0], c[1][0], c[0][1], c[1][1]);
    line(c[0][1], c[1][1], c[0][2], c[1][2]);
    line(c[0][2], c[1][2], c[0][0], c[1][0]);
}

int main()
{
    initwindow(600, 600);
    int a[3][3];
    int x1, y1, x2, y2, x3, y3;
    int ch;
    printf("Enter The Initital Points: \n");
    printf("Enter X1, Y1: \n");
    scanf("%d%d",&x1,&y1);
    printf("Enter X2, Y2: \n");
    scanf("%d%d",&x2,&y2);
    printf("Enter X3, Y3: \n");
    scanf("%d%d",&x3,&y3);
    
    line(x1,y1,x2,y2);
    line(x2,y2,x3,y3);
    line(x3,y3,x1,y1);
    
    a[0][0] = x1;
    a[1][0] = y1;

    a[0][1] = x2;
    a[1][1] = y2;

    a[0][2] = x3;
    a[1][2] = y3;

    a[2][0] = a[2][1] = a[2][2] = 1;
    print(a);  
    
    rotation(a);

    while(!kbhit());
    return 0;
}

Output