DDA

#include<GL/glut.h>
#include<stdio.h>
#include<stdlib.h>

void draw(int x ,int y){
	glBegin(GL_POINTS);
	glColor3f(0,1,0);
	glVertex2i(x,y);
	glEnd();
	}

void lineSe(){
	float x0 = 50,y0= 50;
	float xf= 300,yf=500;
	int step = (abs(x0-xf)>abs(y0-yf)?abs(x0-xf):abs(y0-yf) );
	float xinc = abs(x0-xf)/(step*1.00);
	float yinc = abs(y0-yf)/(step*1.00);
	for(int i=0;i<=step;i++){
		draw(x0+0.5,y0+.05);
		x0+=xinc;y0+=yinc;
		}
	glFlush();
	}

void Init(){
	glClearColor(1.0,1.0,1.0,0.0);
	glClear(GL_COLOR_BUFFER_BIT);
	gluOrtho2D(-640,640,-480,480);
	lineSe();
}

int main(int argc ,char ** argv){
	glutInit(&argc,argv);
	glutInitDisplayMode(GLUT_SINGLE );
	glutInitWindowPosition(100,100);
	glutInitWindowSize(800,800);
	glutCreateWindow("DDA Line");
	Init();
	glutDisplayFunc(lineSe);
	glutMainLoop();
	return 0;
	}