OpenGL通过中点法绘制直线和圆
本文实例为大家分享了OpenGL绘制直线和圆的具体代码，供大家参考，具体内容如下
#include#include staticinti=1; voidInitial(void) { glClearColor(1.0f,1.0f,1.0f,1.0f);//设置窗口背景颜色为白色 glMatrixMode(GL_PROJECTION);//指定设置投影参数 gluOrtho2D(-200.0,200.0,-200.0,200.0);//设置投影参数//指的是视图范围，如果(0,200,0,200)的话就只能在第一象限显示，就1/4圆，第1，3的参数是左下角坐标，第2，4的参数是右上角坐标 } /*voidDisplay(void) { glClear(GL_COLOR_BUFFER_BIT);//用当前背景色填充窗口 glColor3f(1.0f,0.0f,0.0f);//设置当前的绘图颜色为红色 glRectf(50.0f,100.0f,150.0f,50.0f);//绘制一个矩形 glFlush();//处理所有的OpenGL程序 } */ voidDDALine(intx0,inty0,intx1,inty1) { //glVertex2f(10,10); intdx,dy,epsl,k; floatx,y,xIncre,yIncre; dx=x1-x0; dy=y1-y0; x=x0; y=y0; if(abs(dx)>abs(dy)) epsl=abs(dx); else epsl=abs(dy); xIncre=(float)dx/(float)epsl; yIncre=(float)dy/(float)epsl; glPointSize(2); glBegin(GL_POINTS); for(k=0;k<=epsl;k++) { glColor3f(1.0f,0.0f,0.0f); glVertex2f(int(x+0.5),int(y+0.5)); x+=xIncre; y+=yIncre; } glEnd(); } voidMid_B(intx0,inty0,intx1,inty1) { intdx,dy,d,UpIncre,DownIncre,x,y; if(x0>x1) { x=x1; x1=x0; x0=x; y=y1; y1=y0; y0=y; } x=x0; y=y0; dx=x1-x0; dy=y1-y0; d=dx-2*dy; UpIncre=2*dx-2*dy; DownIncre=-2*dy; glPointSize(2); glBegin(GL_POINTS); while(x<=x1) { glColor3f(1.0f,0.0f,0.0f); glVertex2f(x,y); x++; if(d<0) { y++; d+=UpIncre; } else d+=DownIncre; } glEnd(); } voidG_B(intx0,inty0,intx1,inty1) { intx,y,dx,dy,e; dx=x1-x0; dy=y1-y0; e=-dx; x=x0; y=y0; glPointSize(2); glBegin(GL_POINTS); while(x<=x1) { glColor3f(1.0f,0.0f,0.0f); glVertex2f(x,y); x++; e=e+2*dy; if(e>0) { y++; e=e-2*dx; } } glEnd(); } voidCirclePoint(intx,inty) { glPointSize(2); glBegin(GL_POINTS); glColor3f(1.0f,0.0f,0.0f); glVertex2f(x,y); glVertex2f(y,x); glVertex2f(-y,x); glVertex2f(-x,y); glVertex2f(-x,-y); glVertex2f(-y,-x); glVertex2f(y,-x); glVertex2f(x,-y); glEnd(); } voidMidBresenhamCircle(intr) { intx=0,y=r,d=1-r; //glPointSize(2); //glBegin(GL_POINTS); while(x<=y) { CirclePoint(x,y); if(d<0) d+=2*x+3; else { d+=2*(x-y)+5; y--; } x++; } glEnd(); } voidProcessMenu(intvalue) { i=value; glutPostRedisplay(); } voidDisplay(void) { glClear(GL_COLOR_BUFFER_BIT);//用当前背景色填充窗口 glViewport(0,0,400,400);//前两个参数改变原点坐标，后两个参数改变图形长宽（放大缩小） switch(i) { case1: DDALine(2,3,55,83); break; case2: Mid_B(2,3,55,83); break; case3: G_B(2,3,55,83); break; case4: MidBresenhamCircle(50); break; } glFlush(); } intmain(intargc,char*argv[]) { glutInit(&argc,argv);//初始化GLUT库,处理命令行参数 glutInitDisplayMode(GLUT_SINGLE|GLUT_RGB);//初始化窗口的显示模式 glutInitWindowSize(400,400);//设置窗口的尺寸 glutInitWindowPosition(100,100);//设置窗口的位置 glutCreateWindow("直线");//创建一个名为矩形的窗口 intMainMenu=glutCreateMenu(ProcessMenu);//创建主菜单 glutAddMenuEntry("DDA算法",1); glutAddMenuEntry("中点Bresenham算法",2); glutAddMenuEntry("改进的Bresenham算法",3); glutAddMenuEntry("中点bresenham画圆",4); glutAttachMenu(GLUT_RIGHT_BUTTON); glutDisplayFunc(Display);//设置当前窗口的显示回调函数 Initial();//完成窗口初始化 glutMainLoop();//启动主GLUT事件处理循环 return0; }
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