相关背景

代码展示

Test.cpp

#include "freeglut.h"
#include "GlutWin.h"
#include <math.h>
#include <iostream>

#pragma comment(lib,"freeglut.lib")
#define PI 3.1415926
using namespace std;

void myDisplay(void)
{
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
    cout << "正在绘制。。" << endl;

    /*static double theta = 0;
    theta += 0.05;
    glColor3d(1, 0.5, 1);
    glRotated(theta, 0, 1, 0);*/

    int iSeg = 0;
    int iFace = 0;
    GLfloat b = 1.0;
    GLfloat a = PI/2.0f;
    GLfloat y, x, z,r, rNext,xNext,zNext,L,LNext, theta;
    GLfloat dy = 0.5f;
    GLfloat yMax = 12.0f;
    glBegin(GL_TRIANGLE_STRIP);
        for (iSeg = 0; iSeg < 120; iSeg++)//y方向切割
        {
            for (iFace = 0; iFace <= 64; iFace++)//切割面以扇形分割
            {
                y = yMax * iSeg / 120.0;
                theta = 2 * PI*iFace / 64.0;

                r = cos(y + b) + a;  //2.11109853
                rNext = cos(y + dy + b) + a;// 1.64153349

                x = r*cos(theta);  //2.11109853
                z = r*sin(theta);  //0

                xNext = rNext * cos(theta); //1.64153349
                zNext = rNext * sin(theta); //0.000000000

                L = sqrt( pow(x, 2.0) + pow(r*sin(y + b), 2.0) + pow(z, 2.0) );  //2.75906396
                LNext = sqrt( pow(xNext, 2) + pow(rNext * sin(y + dy + b), 2.0) + pow(zNext, 2.0)); //2.31857324

                glNormal3f(x / L, r*sin(y + b) / L, z / L);
                glVertex3f(x,y,z);
                glNormal3f(xNext/LNext,rNext*sin(y+dy+b)/LNext,zNext/LNext);
                glVertex3f(xNext,y+dy,zNext);
            }
        }   
    glEnd();


    glFlush();
    glutSwapBuffers();
}

void myReshape(GLsizei width, GLsizei height)
{
    const float ar = (float)width / (GLfloat)height;
    if (height == 0)
    {
        height = 1;
    }

    //投影->视口变换
    glViewport(0, 0, width, height);
    glClearColor(0.0f, 0.0f, 0.0f, 0.0f);  // 黑
    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();

#if 0
    glOrtho(-1.0, 1.0, -1.0 / ar, 1.0 / ar, -1.0, 1.0);
#else
    gluPerspective(45.0, ar, 0.1, 100.0);
    gluLookAt(0.0, 0.0, 5.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0);
#endif // 透视投影、平行投影
    glScalef(10.0, 10.0, 10.0);

    glMatrixMode(GL_MODELVIEW);
    glLoadIdentity();
}

static void myidle()
{
    glutPostRedisplay();
}

int main(int argc, char *argv[])
{
    GlutWin *win = NULL;
    win = new GlutWin(600, 800, 100, 100, GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH, "青花瓷");

    glutDisplayFunc(myDisplay);
    glutReshapeFunc(myReshape);
    glutIdleFunc(myidle);
    glutMainLoop();

    //glEnable(GL_DEPTH_TEST);
    //glDepthFunc(GL_LESS);  //如果输入的深度值小于参考值，则通过

    //glEnable(GL_LIGHTING);
    //glEnable(GL_LIGHT0);
    //glEnable(GL_COLOR_MATERIAL);  //开启颜色追踪    

    delete win;
    return 0;
}

GlutWin.h

#pragma once
#include <windows.h>
#include "freeglut.h"

//Glut初始化
class GlutWin
{
    
public:
    GlutWin(int windowHeight, int windowWidth,int windowPosX, int windowPosY,
        unsigned int displayMode,const char * windowTitle);
    ~GlutWin() {};

private:
    const char *    windowTitle;
    int             windowHeight, windowWidth;
    int             windowPosX, windowPosY;
    int             windowID;
    unsigned int    displayMode;
    bool            fullScreen;
};

Glutwin.cpp

#include "GlutWin.h"

GlutWin::GlutWin(int windowHeight, int windowWidth,int windowPosX, int windowPosY,
    unsigned int displayMode,const char * windowTitle)
{
    windowTitle = windowTitle;
    windowHeight = windowHeight;
    windowWidth = windowWidth;
    windowPosX = windowPosX;
    windowPosY = windowPosY;
    displayMode = displayMode;
    fullScreen = false;

    char    cmd_line[8];
    char *  argv[1];
    argv[0] = cmd_line;
    int     argc = 1;

    glutInit(&argc, argv);
    glutInitWindowSize(windowWidth, windowHeight);
    glutInitWindowPosition(windowPosX, windowPosY);
    glutInitDisplayMode(displayMode);
    windowID = glutCreateWindow(windowTitle);

    const float ar = (float)windowWidth / (GLfloat)windowHeight;

#if 0
    glOrtho(-1.0, 1.0, -1.0 / ar, 1.0 / ar, -1.0, 1.0);
#else
    gluPerspective(45.0,  ar, 0.1, 100.0);
    gluLookAt(0.0, 0.0, 5.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0);
#endif // 透视投影、平行投影

    glClearColor(0.0f, 0.0f, 0.0f, 0.0f);  // 黑
    glViewport(0, 0, windowWidth, windowHeight);
    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    glScalef(10.0, 10.0, 10.0);

    glMatrixMode(GL_MODELVIEW);
    glLoadIdentity() ;
}