One of the basic line drawing algorithm is DDA Line drawing algorithm. Here i implement this algorithm using OpenGL and C++. So, enjoy this algorithm…

// DDA_algorithm.cpp : Defines the entry point for the console application.

//

#include "stdafx.h"

#include "GL/glut.h"

#define window_wide 1300

#define window_height 700

float x1,y1,x2,y2,check=0;

void setPixel(int x, int y)

{

glBegin(GL_POINTS);

glVertex2i(x,y);

glEnd();

glFlush();

}

void algorithm()

{

float dx = x2-x1;

float dy = y2-y1;

float m = dy/dx;

if(m>=-1 && m<=1)

{

if(dx<0)

{

int temp = x1;

x1 = x2;

x2 = temp;

temp = y1;

y1 = y2;

y2 = temp;

dx *= -1;

dy *= -1;

}

int x = x1;

int y = y1;

while(x < x2)

{

x++;

y = y+m+0.5;

setPixel(x,y);

}

}

else

{

if(dy<0)

{

int temp = x1;

x1 = x2;

x2 = temp;

temp = y1;

y1 = y2;

y2 = temp;

dx *= -1;

dy *= -1;

}

int x = x1;

int y = y1;

while(y < y2)

{

y++;

x = x+1/m+0.5;

setPixel(x,y);

}

}

}

void myMouse(int button, int state, int x, int y)

{

if(button == GLUT_LEFT_BUTTON && state == GLUT_DOWN)

{

if(check==0)

{

x1 = x;

y1 = window_height-y;

check = 1;

setPixel(x1,y1);

}

else if(check==1)

{

x2 = x;

y2 = window_height-y;

check = 0;

setPixel(x2,y2);

algorithm();

//glFlush();

}

}

}

void myDisplay(void)

{

glClearColor(1.0,1.0,1.0,0.0);

glColor3f(1.0,0.0,0.0);

gluOrtho2D(0.0,window_wide,0.0,window_height);

glClear(GL_COLOR_BUFFER_BIT);

glutMouseFunc(myMouse);

}

int _tmain(int argc, char** argv)

{

glutInitWindowSize(window_wide,window_height);

glutInitWindowPosition(0, 0);

glutCreateWindow("Bresenham Center Algorithm");

glutDisplayFunc(myDisplay);

glutMainLoop();

return 0;

}

i just want to know, how to create opengl c++ platform in windows ..some ways from net had tested..but that got failed. I hope that you must replay for this comment..with suitable solutions…

kkkll