Bresenham Line Drawing Algorithm

Bresenham Line Drawing Algorithm

#include<stdio.h>
#include<graphics.h>
#include<conio.h>
void main()
{
    int dx,dy,x,y,p,x1,x2,y1,y2,xend;
    int gd=DETECT,gm;
    clrscr();
    initgraph(&gd,&gm,"C:\\TC\\BGI");
    printf("\n\n Enter the coordinates of first point : ");
    scanf("%d%d",&x1,&y1);
    printf("%d%d \n",x1,y1);
    printf("\n\n Enter the co=ordinates of second point : ");
    scanf("%d %d",&x2,&y2);
    dx=abs(x2-x1);
    dy=abs(y2-y1);
    p=2*(dy) - (dx);
    if (x1>x2)
    {
        x=x2;
        y=y2;
        xend=x1;
    }
    else
    {
        x=x1;
        y=y1;
        xend=x2;
    }
    putpixel(x,y,WHITE);
    setcolor(6);
    setbkcolor(3);
    while(x <= xend)
    {
        if(p<=0)
        {
            x=x+1;
            y=y;
            p=p+2*(dy);
        }
        else
        {
            x=x+1;
            y=y+1;
            p=p+2*(dy-dx);
        }
        putpixel(x,y,WHITE);
    }
    getch();
    closegraph();
}

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