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bresenham.c
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bresenham.c
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#include<GL/glut.h>
#include<stdio.h>
#include<math.h>
static int xi,yi,xf,yf;
void init(void)
{
glClearColor(1.0,1.0,1.0,0.0);
glMatrixMode(GL_PROJECTION);
glPointSize(4.0);
gluOrtho2D(0.0,400.0,0.0,400.0);
}
void setPixel(GLint x,GLint y)
{
glBegin(GL_POINTS);
glVertex2f(x,y);
glEnd();
}
void Line()
{
int x,y;
int dx,dy;
int pk;
int k;
glClear(GL_COLOR_BUFFER_BIT);
glColor3f(0,0,0);
setPixel(xi,yi);
dx=xf-xi;
dy=yf-yi;
pk=2*dy-dx;
x=xi;
y=yi;
for(k=0;k<dx-1;++k)
{
if(pk<0)
{
pk=pk+2*dy;
}
else
{
pk=pk+2*dy-2*dx;
++y;
}
++x;
setPixel(x,y);
}
glFlush();
}
int main (int argc,char **argv)
{
printf("Enter the endpoints of line\n");
scanf("%d%d%d%d",&xi,&yi,&xf,&yf);
glutInit(&argc,argv);
glutInitDisplayMode(GLUT_SINGLE|GLUT_RGB);
glutInitWindowPosition(50,25);
glutInitWindowSize(640,480);
glutCreateWindow("Bresenham Line");
init();
glutDisplayFunc(Line);
glutMainLoop();
return 0;
}