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Transferred from en.wikipedia to Commons by Maksim.
Coloured slice of a 3D Voronoi diagram, made by me.
根據自由軟體基金會發佈嘅無固定段落、封面文字同封底文字GNU自由文件授權條款第1.2或打後嘅版本,你獲授權可以重製、散佈同埋修改爾份文件。授權條款嘅副本喺章節GNU自由文件授權條款。http://www.gnu.org/copyleft/fdl.htmlGFDLGNU Free Documentation Licensetruetrue |
呢個檔案用共享創意 姓名標示-非商業性-相同方式分享3.0 未本地化版本條款授權。 | ||
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This licensing tag was added to this file as part of the GFDL licensing update.http://creativecommons.org/licenses/by-sa/3.0/CC BY-SA 3.0Creative Commons Attribution-Share Alike 3.0truetrue |
//
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.http://www.gnu.org/licenses/gpl.htmlGPLGNU General Public Licensetruetrue |
#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);
}
//
date/time | username | edit summary |
---|---|---|
20:18, 14 October 2004 | en:User:Cyp | (+Image generator source code, made by me) |
20:16, 14 October 2004 | en:User:Cyp | (Coloured slice of a 3D Voronoi diagram, made by me. {{GFDL}}) |
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- (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 } })
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現時 | 2006年3月20號 (一) 19:50 | 333 × 333(26 KB) | Maksim | La bildo estas kopiita de wikipedia:en. La originala priskribo estas: Coloured slice of a 3D Voronoi diagram, made by me. {{GFDL}} //{{GPL}}<pre> #include <stdio.h> #include <math.h> #include <stdlib.h> #include <time.h> #define PI 3.14159265358979323 |
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