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Description:
  line drawing
Language: C/C++
Code:
#include<iostream.h>
#include<graphics.h>
 
void drawline(int x0, int y0, int x1, int y1)
{
    int dx, dy, p, x, y;
 
     dx=x1-x0;
     dy=y1-y0;
 
     x=x0;
     y=y0;
 
     p=2*dy-dx;
 
     while(x<x1)
     {
          if(p>=0)
          {
               putpixel(x,y,7);
               y=y+1;
               p=p+2*dy-2*dx;
          }
          else
          {
               putpixel(x,y,7);
               p=p+2*dy;
          }
          x=x+1;
     }
}
 
int main()
{
     int gdriver=DETECT, gmode, error, x0, y0, x1, y1;
     initgraph(&gdriver, &gmode, "c:\\turboc3\\bgi");
 
     cout<<"Enter co-ordinates of first point: ";
     cin>>x0>>y0;
 
     cout<<"Enter co-ordinates of second point: ";
     cin>>x1>>y1;
     drawline(x0, y0, x1, y1);
 
     return 0;
}
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