OpenGL应用——实现边缘填充算法

来源：互联网发布：windows上安装hadoop 编辑：程序博客网时间：2024/06/07 06:41

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;}

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这里写图片描述

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