shanshuo.rar_opengl_visual c_闪烁

#include <GL/glut.h> #include <stdlib.h> bool hei=true; /*void gl_Point(int x,int y) { glColor3f (1.0, 1.0, 1.0); // glBegin(GL_POINTS); //glVertex2d(0.75, 0.25); if(hei) { // glColor3f (1.0, 1.0, 1.0); glBegin(GL_POINTS); glVertex2i(x, y); glEnd(); hei=false; } else { //glColor3f (0.0, 0.0, 0.0); glBegin(GL_POINTS); glVertex2i(x, y); glEnd(); hei=true; } }*/ void gl_Point(int x,int y) { //glColor3f (1.0, 1.0, 1.0); glBegin(GL_POINTS); glVertex2i(x, y); glEnd(); //glFlush (); } void daa(int x1,int y1,int x2,int y2) { int k,i; float x,y,dx,dy; k=abs(x2-x1); if(abs(y2-y1)>k) k=abs(y2-y1); dx=float(x2-x1)/k; dy=float(y2-y1)/k; x=float(x1); y=float(y1); for(i=0;i<k;i++) { gl_Point(int(x+0.5),int(y+0.5)); x=x+dx; y=y+dy; } } void circle(int radius) { int x,y,f; x=0;y=0+radius;f=0; while(y>0) { gl_Point(x,y); gl_Point(-x,y); gl_Point(x,-y); gl_Point(-x,-y); if(f>0) { f=f-2*y+1;y=y-1; } else { f=f+2*x+1;x=x+1; } } if(y==0){ gl_Point(x,y); gl_Point(-x,y); gl_Point(x,-y); gl_Point(-x,-y); } } void display(void) { /* 清除所有的像素*/ glClear (GL_COLOR_BUFFER_BIT); //gl_Point(); if(hei) glColor3f (0.0, 0.0, 0.0); else glColor3f (1.0, 1.0, 1.0); hei=!hei; daa(50,100,100,100); circle(20); glEnd(); /* 不等待！立刻开始处理在缓冲区中的OpenGL函数调用*/ glFlush (); } void init (void) { /* 指定清除颜色*/ glClearColor (0.0, 0.0, 0.0, 0.0); /* 初始化视景体*/ glMatrixMode(GL_PROJECTION); glLoadIdentity(); glOrtho(-400.0, 400.0, -300.0, 300.0, -1.0, 1.0); } int main(int argc, char** argv) { glutInit(&argc, argv); /*初始化GLUT并处理命令行参数*/ glutInitDisplayMode (GLUT_SINGLE | GLUT_RGB); glutInitWindowSize (800, 600); /*指定窗口的大小，单位为像素*/ glutInitWindowPosition (50, 50); /*指定窗口左上角在屏幕上的位置*/ glutCreateWindow ("实验二"); /*使用一个OpenGL场景创建一个窗口*/ init (); glutDisplayFunc(display); glutIdleFunc(display); glutMainLoop(); return 0; /* ANSI C 要求main()返回一个 int值 */ }