OpenGL实现边缘填充算法

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 
#include 
#include 
#include 
#include 
#include 
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

效果

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