Bresenham's line drawing algorithm in c and c++
Here you will get program for bresenham’s line drawing algorithm in C and C++.
This algorithm is used in computer graphics for drawing line.
The program will work in Turbo C or Turbo C++ compiler as it uses graphics.h header file.
Make sure to change the path of BGI folder inside initgraph() function according to your system. Otherwise the program will not work.
Program for Bresenham’s Line Drawing Algorithm in C
#include<stdio.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");
printf("Enter co-ordinates of first point: ");
scanf("%d%d", &x0, &y0);
printf("Enter co-ordinates of second point: ");
scanf("%d%d", &x1, &y1);
drawline(x0, y0, x1, y1);
return 0;
}
Program for Bresenham’s Line Drawing Algorithm in C++
#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;
}
Output:
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