#include<GL/glut.h>
#include<stdio.h>
#include<math.h>
int xs,ys,ye;
void BresenhamLine(int x0,int y0,int x1,int y1)
{
if((x0!=x1)&&(y0!=y1))
{
int x,y,dx,dy,e,i;
dx=x1-x0;
dy=y1-y0;
e=-dx;x=x0;y=y0;
for(i=0;i<=dx;i++)
}
{
glVertex2i(x,y);
x=x+1;
e=e+dy+dy;
if(e>=0)
{
y=y+1;
e+e-dx-dx;
}
}
}
else
{
int min,d;
if(x0==x1)
{
int x=xo,y;
y=(y0<=y1)? y0:y1;
d=fabs((double)(y0-y1));
while(d>=0)
{
glvVertex2i(x,y+d);
d--;
}
}
if(y0==y1)
{
int x,y=y0;
x=(x0<=x1)? x0:x1;
d=fabs((double)(x0-x1));
while(d>=0)
{
glVertex2i(x+d,y);
d--;
}
}
}
}
void lineSegment()
{
glClear(GL_COLOR_BUFFER_BIT)
glColor3f(0.0,0.0,0.0};
glBegin(GL_POINTS);
BresenhamLine(xs,ys,xe,ye);
glEnd();
glFlush();
}
void main(int argc,char +argv[])
{
glutInit(&argc,argv);
glutInitDisplayMode(GLUT_SINGLE|GLUT_RGB);
printf("输入起始和终止点坐标（范围为0-500,0-500）")；
scanf("%d,%d,%d,%d",&xs,&ys,&xe,&ye);
glutInitWindowPosition(50,100);
glutInitWindowSize(500,500);
glutCreateWindow("Bresenham画线算法");
glClearColor(1.0,1.0,1.0,0.0);
glMatrixMode(GL_PROJECTION);
gluOrtho2D(0.0,500.0,0.0,500.0);
glutDisplayFunc(lineSegment);
glutMainLoop();
}
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