#include<GL/glut.h>voidinit(){glClearColor(0,0,0,0);glMatrixMode(GL_PROJECTION);gluOrtho2D(0,100,0,200);}voidDisplay(){glClear(GL_COLOR_BUFFER_BIT);glBegin(GL_TRIANGLE_FAN);glColor3f(1,0,0);glVertex2f(0,0.5);glVertex2f(-0.4,0);glVertex2f(0.4,0);glColor3f(0,1,0);glVertex2f(0,-0.5);glEnd();glFlush();}intmain(intargc,char**argv){glutInit(&argc,argv);glutInitDisplayMode(GLUT_SINGLE|GLUT_RGB);glutInitWindowSize(500,500);glutInitWindowPosition(200,200);glutCreateWindow("line");glutDisplayFunc(Display);init();glutMainLoop();return0;}
