DDA Line Drawing C Program Using graphics.h

DDA Line Drawing C Program

Digital differential analyzer (DDA) is a floating-point operation based computer line drawing algorithm.

Follow The Instructions To Successfully Run The Program In Dev-Cpp/CodeBlock:

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 dda(int x1, int y1, int x2, int y2)
{
    initwindow(500, 500, "DDA");
    int step, xInc, yInc, x, y, dx, dy;
    dx = x2 - x1; dy = y2 - y1;
    step = (abs(dx) > abs(dy))? dx : dy;
    xInc = dx / step; 
    yInc = dy / step;
    x = x1; 
    y = y1;
    putpixel(round(x), round(y), 1);
    
    for (int i = 0; i < step; i++) {
        x += xInc; y += yInc;
        putpixel(round(x), round(y), 1);
    }
}

int main()
{
    int x1,y1, x2, y2;
    printf("Enter The Points:\n");
    printf("(x1,y1): ? ");
    scanf("%d%d",&x1,&y1);
    printf("(x2,y2): ? ");
    scanf("%d%d",&x2,&y2);
    dda(x1,y1,x2,y2);
    while(!kbhit());
    return 0;
}

Output