Image:Coloured Voronoi 3D slice.png

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La bildo estas kopiita de wikipedia:en. La originala priskribo estas:

Coloured slice of a 3D Voronoi diagram, made by me.

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//

This work is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or any later version. This work is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See version 2 and version 3 of the GNU General Public License for more details. العربية | Català | Česky | Deutsch | Ελληνικά | English | Español | فارسی | Français | Italiano | 日本語 | Nederlands | Polski | Português | Русский | Slovenčina | Svenska | Türkçe | ‪中文(简体)‬ | ‪中文(繁體)‬ | +/-

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

#define PI 3.141592653589793238462643383279502884197169399375105820974944592307816406286208998628034825
#define PI2 (PI*2)
#define SQ2 1.414213562373095048801688724209698078569671875376948073176679737990732478462
#define FI 1.618033988749894848204586834365638117720309179805762862135448622705260462818902449707207204

/*
#define SX 666
#define SY 666
#define NPT 100
#define RSD 666
#define V3D 0
*/
#define SX 666
#define SY 666
#define NPT 1000
#define RSD 1923879
#define V3D 1


#define BPL ((SX*3+3)&~3)

void seedr(unsigned int);
unsigned int rnd();
unsigned int rndm(unsigned int);

unsigned char bhdr[54]={
0x42, 0x4D, 0x36, 0x00, 0x30, 0x00, 0x00, 0x00, 0x00, 0x00, 0x36, 0x00, 0x00, 0x00, 0x28, 0x00,
0x00, 0x00, 0x00, 0x04, 0x00, 0x00, 0x00, 0x04, 0x00, 0x00, 0x01, 0x00, 0x18, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x30, 0x00, 0x12, 0x0B, 0x00, 0x00, 0x12, 0x0B, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00};

unsigned char po[BPL];

double gr[SY][SX][3];

void drawit();

int main(int a, char **b) {
  FILE *o;
  int x, y, c;
  double t;
  char *p;

  srand(time(0));
  drawit();
  
  p=bhdr+2; *p++=x=54+BPL*SY; *p++=x>>=8; *p++=x>>=8; *p=x>>=8;
  p=bhdr+18; *p++=x=SX; *p++=x>>=8; *p++=x>>=8; *p++=x>>=8;
  *p++=x=SY; *p++=x>>=8; *p++=x>>=8; *p=x>>=8;

  if(!(o=fopen("voronoi.bmp", "wb"))) {
    fclose(o);
    printf("Couldn't open output file.\n");
    return(0);
  }
  
  fwrite(bhdr, 54, 1, o);

  for(x=SX*3;x<BPL;++x) po[x]=0;
  
  for(y=SY-1;~y;--y) {
    for(x=0,p=po;x<SX;++x) for(c=2;~c;--c) *p++=(t=gr[y][x][c])<=0?0:(t>=1?255:t*255);
    fwrite(po, BPL, 1, o);
  }

  fclose(o);
  return(0);
}


int ptx[NPT], pty[NPT], ptz[NPT];
double ptc[NPT][3];

void drawit() {
  int x, y, c, n, bn, dx, dy, dz;
  unsigned int m, p;
  seedr(RSD);
  for(n=0;n<NPT;++n) {
    ptx[n]=rndm(SX); pty[n]=rndm(SX); ptz[n]=(!!V3D)*(rndm(SX)-SX/2);
    for(c=0;c<3;++c) ptc[n][c]=rnd()/(double)~0u;
  }
  for(y=0;y<SY;++y) for(x=0;x<SY;++x) {
    for(n=0,m=~0;n<NPT;++n) {
      dx=x-ptx[n]; dy=y-pty[n]; dz=-ptz[n]; p=dx*dx+dy*dy+dz*dz;
      if(p<m) { m=p; bn=n; }
    }
    for(c=0;c<3;++c) gr[y][x][c]=ptc[bn][c];
  }
  if(!V3D)
    for(n=0;n<NPT;++n)
      for(y=-1+!pty[n];y<=1-(pty[n]==SY-1);++y)
        for(x=-1+!ptx[n];x<=1-(ptx[n]==SX-1);++x)
          for(c=0;c<3;++c)
            gr[pty[n]+y][ptx[n]+x][c]=0;
}

unsigned int rseeda[624];
int rseedu;

void seedr(unsigned int s) {
  int n;
  rseedu=624; rseeda[0]=s; for(n=1;n<624;++n) rseeda[n]=s*=69069u;
}

#define TEMPBLAH(x,y,z) { v=(rseeda[x]&0x80000000)|(rseeda[y]&0x7fffffff);\
                          rseeda[x]=rseeda[z]^(v>>1)^(0x9908b0df&(0-(v&1)));}
void gennewr() {
  int n;
  unsigned int v;
  for(n=0;n<227;++n) TEMPBLAH(n, n+1, n+397);
  for(;n<623;++n) TEMPBLAH(n, n+1, n-227);
  TEMPBLAH(623, 0, 396);
  rseedu=0;
}
#undef TEMPBLAH

unsigned int rnd() {
  if(rseedu>=624) gennewr();
  unsigned int v=rseeda[rseedu++];
  v^=v>>11;
  v^=(v<<7)&0x9d2c5680;
  v^=(v<<15)&0xefc60000;
  v^=v>>18;
  return(v);
}

unsigned int rndm(unsigned int m) {
  unsigned int v, c=(0u-m)/m;
  while((v=rnd())/m>c);
  return(v%m);
}

//

[edit] Historio de la dosiero

Legend: (cur) = this is the current file, (del) = delete this old version, (rev) = revert to this old version.

Click on date to download the file or see the image uploaded on that date.

• (del) (cur) 20:16, 14 October 2004 . . en:User:Cyp Cyp ( en:User_talk:Cyp Talk) . . 333x333 (27132 bytes) (Coloured slice of a 3D Voronoi diagram, made by me. { { GFDL } })

• Voronoi diagram