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