電腦圖學week03

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#include <GL/glut.h>#include <math.h>void display(){    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);    glColor3f(1,0,0);    glBegin(GL_POLYGON);    for (int i=0;i<30;i++)    {        float a=3.1415926*2/30*i;        glVertex2f(0.5+0.1*cos(a),0.2*sin(a) );    }        glEnd();        glutSwapBuffers();}int main(int argc,char**argv){    glutInit(&argc,argv);    glutInitDisplayMode(GLUT_DOUBLE | GLUT_DEPTH);    glutCreateWindow("Week033-Circle");
    glutDisplayFunc(display);
    glutMainLoop();}