OpenGL实现边缘填充算法分享！

边缘填充的思想：枚举每一条边，对这条边右边的像素进行求补操作，就是有填充则去掉，无填充就进行填充

  #include <GL/gl.h>  #include <GL/glut.h>  #include <iostream>  #include <cmath>  #include <cstring>  #include <string>  using namespace std;  int x[]= {10,70,70,60,40,30,20};  int y[]= {10,10,50,40,60,20,30};  int vis[500][500]; //判断该坐标的点是否存在  void init()  {   glClearColor (0.0, 0.0, 0.0, 0.0);   glMatrixMode (GL_PROJECTION);   gluOrtho2D (0.0, 200.0, 0.0, 150.0);  }  void MidBresenhamCircle()  {   memset(vis,0,sizeof(vis));   glClear(GL_COLOR_BUFFER_BIT);   glLineWidth(2);   glBegin(GL_LINES); //绘制多边形形状   for(int i=0; i<7; ++i)   {    glVertex2i(x[i],y[i]);    glVertex2i(x[(i+1)%7],y[(i+1)%7]);   }   glEnd();   glFlush();   glPointSize(2);   glBegin(GL_POINTS);   for(int i=x[1],j=y[1]; i<300; ++i) //特殊处理k=0的边   {    if(!vis[i][j])    {     glColor3f(0.0f,1.0f,0.0f);     glVertex2i(i,j);     vis[i][j]=1;    }    else    {     glColor3f(0.0f,0.0f,0.0f);     glVertex2i(i,j);     vis[i][j]=1;    }   }   for(int j=y[1]; j<=y[2]; ++j) //特殊处理k不存在的边   {    for(int i=x[1]; i<300; ++i)    {     if(!vis[i][j])     {      glColor3f(0.0f,1.0f,0.0f);      glVertex2i(i,j);      vis[i][j]=1;     }     else     {      glColor3f(0.0f,0.0f,0.0f);      glVertex2i(i,j);      vis[i][j]=1;     }    }   }   for(int p=2; p<7; ++p)   {    int k=(y[(p+1)%7]-y[p])/(x[(p+1)%7]-x[p]); //求出斜率    int x1=x[(p+1)%7],x0=x[p],y1=y[(p+1)%7],y0=y[p]; //根据斜率推导出这条直线的各个点    if(y1<y0)    {     swap(x1,x0);     swap(y1,y0);    }    for(int j=y0; j<=y1; ++j)    {     int i=(j-y0+k*x0)/k;     for(int px=i; px<300; ++px)     {      if(!vis[px][j])      {       glColor3f(0.0f,1.0f,0.0f);       glVertex2i(px,j);       vis[px][j]=1;      }      else      {       glColor3f(0.0f,0.0f,0.0f);       glVertex2i(px,j);       vis[px][j]=0;      }     }    }   }   glEnd();   glFlush();  }  int main(int argc, char *argv[])  {   glutInit(&argc, argv);   glutInitDisplayMode(GLUT_RGB | GLUT_SINGLE);   glutInitWindowPosition(100, 100);   glutInitWindowSize(500, 500);   glutCreateWindow("第一个opengl程序");   init();   glutDisplayFunc(MidBresenhamCircle);   glutMainLoop();   return 0;  }

效果

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