螺旋线

代码如下：

#include <windows.h>
//#include <GLUT/glut.h>
#include <GL/glut.h>
#include <math.h>
#include <iostream>
using namespace std;

#define GL_PI 3.1415f

void RenderScene()
{
    GLfloat x,y,z,angle;

    glClear(GL_COLOR_BUFFER_BIT);

    glPushMatrix();
    glRotatef(45.0,1.0f,0.0f,0.0f);
    glRotatef(45.0,0.0f,1.0f,0.0f);

    glPointSize(5.0f);

    glBegin(GL_POINTS);
    z = -50.0f;
    for(angle = 0.0f;angle <= (2.0f*GL_PI)*3.0f;angle += 0.1f)
    {
        x = 50.0f*sin(angle);
        y = 50.0f*cos(angle);

        glVertex3f(x,y,z);
        z += 0.5f;
        cout<<"x: "<<x<<" ,y: "<<y<<" ,z: "<<z<<endl;
    }
    glEnd();

    glPopMatrix();
    glutSwapBuffers();
}

void ChangeSize(GLsizei w,GLsizei h)
{
    if(h==0)
        h = 1;

    GLfloat aspectRatio = (GLfloat)w/(GLfloat)h;

    glViewport(0,0,w,h);

    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();

    if(w<h)
    {
        glOrtho(-100.0,100.0,-100.0/aspectRatio,100.0/aspectRatio,100.0,-100.0);
        //windowWidth = 100;
        //windowHeight = 100/aspectRatio;
    }
    else
    {
        glOrtho(-100.0*aspectRatio,100.0*aspectRatio,-100.0,100.0,100.0,-100.0);
        //windowWidth = 100*aspectRatio;
        //windowHeight = 100;
    }

    glMatrixMode(GL_MODELVIEW);
    glLoadIdentity();
    //glLookAt()
}

void SetupRC()
{
    glClearColor(0.0f,0.0f,0.0f,1.0f);
    glColor3f(0.0f,1.0f,0.0f);
}

int main(int argc, char *argv[])
{
   glutInit(&argc,argv);
   glutInitDisplayMode(GLUT_DOUBLE|GLUT_RGB);
   glutInitWindowSize(800,600);
   glutCreateWindow("Simple");

   glutDisplayFunc(RenderScene);
   glutReshapeFunc(ChangeSize);

   SetupRC();
   glutMainLoop();
   return 0;
}