attachment:main.c von OpenGL

   1 #include <stdio.h>
   2 #include <GL/glut.h>
   3 #include <math.h>
   4 
   5 static GLfloat spin=0.0;
   6 GLfloat d=0.0;
   7 GLfloat e=0.0;
   8 GLfloat a=0.0;
   9 int autorotate=0;
  10 void display(void){
  11         GLdouble eqn[4] = {0.0,1.0,0.0,0.0};
  12         GLdouble eqn2[4] = {1.0,0.0,0.0,0.0};
  13         GLfloat circle;
  14         GLfloat i;
  15         GLfloat oldx;
  16         GLfloat oldy;
  17         GLfloat alpha;
  18         GLfloat length; 
  19         glMatrixMode(GL_MODELVIEW);
  20         glLoadIdentity();
  21         glClearColor(0,0,0.2,0);
  22         glColor3f (0, 0, 0.9);
  23         glClear(GL_COLOR_BUFFER_BIT);
  24         glFlush();
  25         if(autorotate==1){
  26                 a++;
  27                 glRotatef(a,1,1,1);
  28                 if(a==360){
  29                         a=0;
  30                 }
  31         } 
  32 
  33           glRotatef(d,1,0,0);
  34           glRotatef(e,0,1,0);
  35           glBegin(GL_LINES);
  36           glVertex3f(0,0,0);
  37           glVertex3f(0,1,0);
  38           glVertex3f(0,0,0);
  39           glVertex3f(0,0,1);
  40           glVertex3f(0,0,0);
  41           glVertex3f(1,0,0);
  42           glEnd(); 
  43           for(i=1;i<360;i+=5){
  44                   glBegin(GL_LINES);
  45                   for(circle=0;circle<=360;circle++){
  46                           glVertex3f(sin(circle/180*M_PI),cos(circle/180*M_PI),0);
  47                           
  48                   }
  49                   glEnd();
  50                   glRotatef(5,0,1,0);
  51           }
  52          for(i=-1;i<=1;i+=0.1){
  53                  length=cos(asin(i));
  54                  glBegin(GL_LINES);
  55                  for(circle=0;circle<=360;circle++){
  56                          if(length!=0){
  57                                   glVertex3f(length*sin(circle/180*M_PI),i,length*cos(circle/180*M_PI));
  58                          }
  59                  }
  60                  glEnd();
  61         }
  62         glFlush();
  63         glutSwapBuffers();
  64 }
  65 
  66 void keyboard(int key, int x, int y){
  67         
  68         glMatrixMode(GL_MODELVIEW);
  69         glLoadIdentity();
  70         switch(key){
  71                case GLUT_KEY_UP:
  72                        printf("key up!\n");
  73                        d--;
  74                        break;
  75                case GLUT_KEY_DOWN:
  76                        printf("key down!\n");
  77                        d++;
  78                        break;
  79                case GLUT_KEY_LEFT:
  80                        printf("key left!\n");
  81                        e--;
  82                        break;
  83                case GLUT_KEY_RIGHT:
  84                        printf("key right!\n");
  85                        e++;
  86                        break;
  87                case GLUT_KEY_PAGE_UP:
  88                        autorotate=1;
  89                        a++;
  90                        break;
  91                case GLUT_KEY_PAGE_DOWN:
  92                        autorotate=0;
  93                        break;
  94         }
  95         display();
  96 }
  97 
  98 
  99 int main(int argc, char **argv){
 100         glutInit(&argc,argv);
 101         glutInitDisplayMode(GLUT_DOUBLE| GLUT_RGB| GLUT_DEPTH);
 102         glutInitWindowSize(640,480);
 103          glEnable(GL_DEPTH_TEST); 
 104          glEnable(GL_TEXTURE_2D);
 105         glMatrixMode(GL_MODELVIEW);
 106         glLoadIdentity();
 107         glutInitWindowPosition(0,0);
 108         glutCreateWindow("revenger's tutorial");
 109         glutSpecialFunc(keyboard);
 110 //        display();
 111         glutDisplayFunc(display);
 112         glutIdleFunc(display);
 113         glutMainLoop();
 114         return(0);
 115 }