OpenGL实现的一个wire-sphere的小程序

#include <stdio.h>#include <stdlib.h>#include <math.h>#include <string.h>

#include <GL/glut.h>

static float * Data = NULL;static float lati_array[10404][3];static float longi_array[5100][3];static float angle = 2 * 3.1415 / 100;static int radius = 60;static char temp[80];

static void getdata(float **data){

static int i = 0, j = 0;//static float angle_xy, angle_xz;static FILE   *fp;

fp = fopen("latitude_sphere_data", "ab");

  for(i = 0; i < 102; i++)     {        //angle_xy = (i - 1) * angle;        //angle_xz = (i - 1) * angle;        for (j = 0; j < 102; j++)             {                   lati_array[j + (i  * 102)][0] = (radius * cos(i * angle)) * cos(j * angle);                   sprintf(temp, " %f ,  ", lati_array[j + (i * 102)][0]);                    fwrite(temp, strlen(temp), 1, fp);

                   lati_array[j + (i * 102)][1] = radius * sin(i * angle);                   sprintf(temp, " %f ,  ", lati_array[j + (i * 102)][1]);                                          fwrite(temp, strlen(temp), 1, fp);

                   lati_array[j + (i * 102)][2] = (radius * cos(i * angle)) * sin(j * angle);                   sprintf(temp, " %f ,  /n", lati_array[j + (i * 102)][2]);                                          fwrite(temp, strlen(temp), 1, fp);              }             }

fclose(fp);

fp = fopen("longitude_sphere_data", "ab");

  for(i = 0; i < 50; i++)     {        //angle_xy = (i - 1) * angle;        //angle_xz = (i - 1) * angle;        for (j = 0; j < 102; j++)             {                   longi_array[j + (i  * 102)][0] = (radius * cos(j * angle)) * cos(i * angle);                   sprintf(temp, " %f ,  ", longi_array[j + (i * 102)][0]);                    fwrite(temp, strlen(temp), 1, fp);

                   longi_array[j + (i * 102)][1] = radius * sin(j * angle);                   sprintf(temp, " %f ,  ", longi_array[j + (i * 102)][1]);                                          fwrite(temp, strlen(temp), 1, fp);

                   longi_array[j + (i * 102)][2] = (radius * cos(j * angle)) * sin(i * angle);                   sprintf(temp, " %f ,  /n", longi_array[j + (i * 102)][2]);                                          fwrite(temp, strlen(temp), 1, fp);              }             }

fclose(fp);

}

static void draw(float *data){static int i = 0;

 glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); glVertexPointer(3, GL_FLOAT, 0, lati_array); glEnableClientState(GL_VERTEX_ARRAY); glColor4f(0.0, 1.0, 0.0, 1.0); for (i = 0; i < 102; i++ )     {         glDrawArrays(GL_LINE_LOOP, (i * 102), 102);     }

  glDisableClientState(GL_VERTEX_ARRAY);

 glVertexPointer(3, GL_FLOAT, 0, longi_array); glEnableClientState(GL_VERTEX_ARRAY); glColor4f(1.0, 0.0, 0.0, 1.0); for (i = 0; i < 50; i++ )     {         glDrawArrays(GL_LINE_LOOP, (i * 102), 102);     }

  glDisableClientState(GL_VERTEX_ARRAY);

}

static void reshape(int width, int height){    float aspect = (float) width / (float) height;    glViewport(0, 0, (GLint) width, (GLint) height);    glMatrixMode(GL_PROJECTION);    glLoadIdentity();    glOrtho(-100.0 * aspect, 100.0 * aspect, -100.0, 100.0, -100.0, 100.0);    glMatrixMode(GL_MODELVIEW);  }

static void display(void){    glRotatef(45.0, 1.0, 0.0, 0.0);    //glRotatef(0, 0.0, 0.0, 1.0);        draw(Data);     //NSidedPolygon(n, cx, cy, radius);      //glPopMatrix();

}

static voidinit(void){      getdata(&Data);    //getdata(array);    glCullFace(GL_BACK);    //glEnable(GL_CULL_FACE);    glDisable(GL_DITHER);    glShadeModel(GL_FLAT);    glEnable(GL_DEPTH_TEST);}

static voidkey(unsigned char k, int x, int y){  switch (k) {  case 27:  /* Escape */    exit(0);    break;  default:    return;  }  glutPostRedisplay();}

int main(int argc, char** argv){   glutInit(&argc, argv);   glutInitDisplayMode (GLUT_SINGLE | GLUT_RGB | GLUT_DEPTH);   glutInitWindowSize (800, 600);   glutInitWindowPosition (100, 100);   glutCreateWindow (argv[0]);   init ();   glutReshapeFunc(reshape);   glutDisplayFunc(display);   glutKeyboardFunc(key);   glutMainLoop();   glFinish();   return 0;   /* ANSI C requires main to return int. */}

自己写的一个小程序，运行之后如上图所示。