WAP for DDA

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#include<GL/glut.h>
#include<stdio.h>
#include<stdlib.h>
void plot(int xa,int ya,int xb, int yb)
{
        int dx=xb-xa;
        int dy=yb-ya;
        int steps,k;
        float xIncrement,yIncrement;
        float x=xa,y=ya;
        glPointSize(5);
        glClear (GL_COLOR_BUFFER_BIT);
        glColor3f (1.0, 1.0, 0.0);
 
        if(abs(dx)>abs(dy))
              steps=abs(dx);
        else
             steps=abs(dy);

        xIncrement=dx/(float)steps;
        yIncrement=dy/(float)steps;

        glBegin(GL_POINTS);
        glVertex2i(x,y);
        for(k=0;k<steps;k++)
       {
                x+=xIncrement;
                y+=yIncrement;
                glVertex2i(x,y);
        }

        glEnd();
        glFlush();
}

void init()
{
        glMatrixMode(GL_PROJECTION);
        glLoadIdentity();
        gluOrtho2D(-10,10,-10,10);
}
void disp()
{
         plot(0,0,6,4);     // End points of line(x0,y0,x1,y1)
}
int main(int argc, char** argv)
{
        glutInit(&argc,argv);
        glutInitDisplayMode(GLUT_SINGLE|GLUT_SINGLE);
        glutInitWindowSize(100,100);
        glutCreateWindow("Point");
        init();
        glutDisplayFunc(disp);
        glutMainLoop();
        return 0;
}


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