#include <GL/glut.h>
#include<stdio.h>
#include<stdlib.h>
int R=100;
void bresenham_arc(int r)//bresenham函数
{

    int x,y,d;
    x=0;y=r;d=1-r;
while(x<=y)
{
    glBegin(GL_POINTS );
    glVertex2f(x,y);
    if(d<0)
    d+=2*x+3;
    else
    {
     d+=2*(x-y)+5;
      y--;
     }
      x++;
     glVertex2f(x,y);
     glVertex2f(x,-y);
     glVertex2f(-x,y);
     glVertex2f(-x,-y);
     glVertex2f(y,x);
     glVertex2f(y,-x);
     glVertex2f(-y,x);
     glVertex2f(-y,-x);
     glEnd();
   }
}


void myDisplay(void)
{
     glClear(GL_COLOR_BUFFER_BIT); //清除颜色缓存
     glPushAttrib(GL_POINT_BIT);
     glBegin(GL_POINTS);
     glColor3f(0.0f,10.0f,36.0f); //圆的颜色的变化
     glVertex2f(0.0f,0.0f);
     glEnd();
     
     
     glPopAttrib();
     glPolygonMode(GL_FRONT_AND_BACK,GL_LINE);
     bresenham_arc(R); //圆的半径的控制
     glFlush();
}


void Init()
{  
     glClearColor(0.0,0.0,0.0,0.0);
     glShadeModel(GL_FLAT);
}


void Reshape(int w,int h)
{
    glViewport(200,250,(GLsizei)w,(GLsizei)h);
    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    gluOrtho2D(-100,(GLdouble)w,-100,(GLdouble)h);
}


void mouse(int KEY)
{
     switch(KEY)
     {
     case GLUT_KEY_UP:
             R+=20;
     case GLUT_KEY_DOWN:
             R-=20;
             break;
      default:
         break;
         }

}


int main(int argc ,char*argv[])
{   
    glutInit(&argc,argv);
    glutInitDisplayMode(GLUT_RGB|GLUT_SINGLE);
    glutInitWindowPosition(100,100);
    glutInitWindowSize(600,600);
    glutCreateWindow("Bresenham ?");
    Init();
    glutDisplayFunc(myDisplay);
    glutReshapeFunc(Reshape);
    glutMouseFunc(mouse);
    glutMainLoop();
    system("color 07");
    return 0;
}
在这个程序的运行下有：error C2664: 'glutMouseFunc' : cannot convert parameter 1 from 'void (int)' to 'void (__cdecl *)(int,int,int,int)'
        None of the functions with this name in scope match the target type
这就是这个运行的问题