Bresenham Line Algorithm Using OpenGL and C++ _ CSE ENGINEERS

Bresenham Line Algorithm Using OpenGL and C++ | CSE ENGINEERS

http://engineersview.wordpress.com/2013/05/21/bresenham-line-algorithm-using-opengl-and-c/[11/02/2014 19:59:53]

CSE ENGINEERSAl Hizbul Bahar

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Bresenham Line Algorithm Using OpenGL and C++Posted on May 21, 2013 by Al Hizbul Bahar Leave a comment

Bresenham Line Algorithm Using OpenGL and C++.

// bresenham_line_algorithm.cpp : Defnes the entry point for the console application.

//

#include "stdafx.h"

#include "GL/glut.h";

foat x1,x2,y1,y2,b=0;

void setPixel(int x, int y)

{

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glBegin(GL_POINTS);

glVertex2i(x,y);

glEnd();

glFlush();

}

void horizontal()

{

if(x1>x2)

{

foat temp;

temp = x1;

x1 = x2;

x2 = temp;

}

for(foat x=x1; xy2)

{

foat temp;

temp = y1;

y1 = y2;

y2 = temp;

}

for(foat y=y1; yx2)

{

foat temp;

temp = x1;

x1 = x2;

x2 = temp;

temp = y1;

y1 = y2;

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y2 = temp;

}

int x = x1, y = y1;

int dx = x2-x1;

int dy = y2-y1;

int dT = 2*(dy-dx);

int dS = 2*dy;

int d = 2*dy-dx;

setPixel(x,y);

while(x



setPixel(x,y);

while(x



{

x++;

d = d+dT;

}

setPixel(x,y);

}

setPixel(x2,y2);

}

void bresenham4()

{

if(y1>y2)

{

foat temp;

temp = x1;

x1 = x2;

x2 = temp;

temp = y1;

y1 = y2;

y2 = temp;

}

int x = x1, y = y1;

int dx = x2-x1;

int dy = y2-y1;

int dT = 2*(dy+dx);

int dS = 2*dx;

int d = -(2*dy+dx);

setPixel(x,y);

while(y



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

{

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

{

if(b==0)

{

x1 = x;

y1 = 480-y;

b = 1;

}

else if(b==1)

{

x2 = x;

y2 = 480-y;

b = 0;

if(y1==y2) horizontal();

else if(x1==x2) vertical();

foat m = (y2-y1)/(x2-x1);

if(0-1) bresenham2();

else if(1m) bresenham4();

}

}

}

void myDisplay(void)

{

glClearColor(1.0,1.0,1.0,0.0);

glColor3f(1.0,0.0,0.0);

gluOrtho2D(0.0,640.0,0.0,480.0);

glClear(GL_COLOR_BUFFER_BIT);

glutMouseFunc(myMouse);

glFlush();

}

int _tmain(int argc, char** argv)

{

glutInitWindowSize(640,480);

glutInitWindowPosition(100, 100);

glutCreateWindow ("A simple Line");

glutDisplayFunc(myDisplay);

glutMainLoop ( );



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return 0;

}

To get complete code and project contact with me through email , mobile. You may commented below as your requirement.

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About Al Hizbul Bahar

Junior Software Engineer at Nascenia IT , Dhaka , Bangladesh

Tagged with: Bresenham algorithm, OpenGL

Posted in OpenGL

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Bresenham Line Algorithm Using OpenGL and C++ _ CSE ENGINEERS