我的OpenGL學習筆記二

 I am a fresh man in CSDN, so I have to start with nothing.

I am a programmer. what I have learned are C/C++ ASP,SQL

I have learned OPENGL for several weeks.

The following is my complied program

  #include "stdafx.h"

#include <GL/glut.h>

#include <GL/gl.h>

#include <GL/glu.h>

#include "windows.h"

#include "math.h"

static GLfloat spin=0.0;

static GLfloat view_rotx = 20.0, view_roty = 30.0, view_rotz = 0.0;

GLdouble g_eye;  

GLdouble g_look; 

void init(void)

{

g_eye=0.0;

g_look=0.0;

g_eye=0.0;

glClearColor(1.0,1.0,1.0,1.0);

glShadeModel(GL_SMOOTH);

glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);

glEnable(GL_BLEND);

}

void idle(void)

{

 spin=spin+0.25;

 if(spin>360.0)

  spin=spin-360.0;

 glutPostRedisplay();

}

void display(void)

{

  glClear(GL_COLOR_BUFFER_BIT);

    glPushMatrix();

   glTranslatef(0.0,g_look,g_eye);

    glRotatef(view_rotx, 1.0, 0.0, 0.0);

 glRotatef(view_roty, 0.0, 1.0, 0.0);

 glRotatef(view_rotz, 0.0, 0.0, 1.0);

        glRotated(spin, 1.0, 0.0, 0.0);

        glRotated(spin, 0.0, 1.0, 0.0);

       glBegin(GL_TRIANGLE_STRIP);

            glColor4f(1.0, 0.0, 0.0, 0.3);

            glVertex3f(-1.0, -1.0, 1.0);

            glVertex3f(1.0, -1.0, 1.0);

            glVertex3f(-1.0, 1.0, 1.0);

            glVertex3f(1.0, 1.0, 1.0);

            glColor4f(0.0, 1.0, 0.0, 0.3);

            glVertex3f(-1.0, 1.0, -1.0);

            glVertex3f(1.0, 1.0, -1.0);

            glColor4f(0.0, 0.0, 1.0, 0.3);

            glVertex3f(-1.0, -1.0, -1.0);

            glVertex3f(1.0, -1.0, -1.0);

        glEnd();

        glBegin(GL_TRIANGLE_STRIP);

            glColor4f(1.0, 1.0, 0.0, 0.3);

            glVertex3f(-1.0, 1.0, -1.0);

            glVertex3f(-1.0, 1.0, 1.0);

            glVertex3f(-1.0, -1.0, -1.0);

            glVertex3f(-1.0, -1.0, 1.0);

            glColor4f(0.0, 1.0, 1.0, 0.3);

            glVertex3f(1.0, -1.0, -1.0);

            glVertex3f(1.0, -1.0, 1.0);

            glColor4f(1.0, 0.0, 1.0, 0.3);

            glVertex3f(1.0, 1.0, -1.0);

            glVertex3f(1.0, 1.0, 1.0);

        glEnd();

    glPopMatrix();

    glutSwapBuffers();

}

void reshape(int w,int h)

{

 glViewport(0,0,(GLsizei) w,(GLsizei)h);

 glMatrixMode(GL_PROJECTION);

 glLoadIdentity();

    gluPerspective(60.0, (GLfloat)w / (GLfloat)h, 1.0, 10.0);

 glMatrixMode(GL_MODELVIEW);

 glLoadIdentity();

    gluLookAt(0.0, 0.0, 4.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0);

  //  gluLookAt(0,0,4.0,0.0,g_eye[2],g_look[2],0.0,1.0,0.0);

}

void mouse(int button,int state,int x,int y)

{

 switch(button)

 {

 case GLUT_LEFT_BUTTON:

  if (state==GLUT_DOWN)

       glutIdleFunc(idle);

  break;

  case GLUT_RIGHT_BUTTON:

   if (state==GLUT_DOWN)

       glutIdleFunc(NULL);

   break;

  default :break;

 }

}

 void key(unsigned char k, int x, int y)

{

  switch (k)

 {

        case 'w':

   view_rotx += 5.0;

   break;

  case 's':

   view_rotx -= 5.0;

   break;

  case 'a':

   view_roty += 5.0;

   break;

  case 'd':view_roty -= 5.0;break;

        case 'l':   g_look+=0.05;break;

        case 'j': g_look-=0.05;break;

        case 'i': 

                    g_eye+=0.05;break;

        case 'k':

                  g_eye-=0.05;break;

  case'v':view_rotx = 1.0;view_roty = 2.0;view_roty = 5.0;break;

  case'b':view_rotx = 5.0;view_roty = 1.0;view_roty = 5.0;break;

  case'n':view_rotx = 15.0;view_roty = 8.0;view_roty = 4.0;break;

  default:

   return;

 }

}

int main(int argc,char* argv[])

{

  // TODO: Place code here.

 glutInit(&argc,argv);

 glutInitDisplayMode(GLUT_DOUBLE|GLUT_RGB);

 glutInitWindowSize(500,500);

 glutInitWindowPosition(100,100);

 glutCreateWindow(argv[0]);

 init();

    glutKeyboardFunc(key);

 glutDisplayFunc(display);

 glutReshapeFunc(reshape); 

 glutMouseFunc(mouse);

    glutIdleFunc(idle);

//    glutSpecialFunc(special);

 glutMainLoop();

 return 0;

}

 "w""a""s""d" are the charging the rotat e

 press "i""j""k""l"  to control eye position