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[粒子生成器]DParticle/src/dxp/dpt/shape/Circle.php

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+<?php
+namespace dxp\dpt\shape;
+/*
+圆算法
+ By:aabbcc872[dxp]
+ 最后一次优化:2017.10.11
+参数说明:
+ r=半径[double|int|float]
+ data=array(密度)[建议为90因数，设为-1弹性计算]
+*/
+class Circle extends ShapeBase{
+ public static function getVector3($r=2,$data=array()){
+  $pos=array();
+  //密度控制
+  if(!isset($data[0])){
+   $k=-1;
+  }
+  if($data[0]==0){
+   return array(0,0,0);
+  }
+  if($data[0]==-1){
+   
+  $ar=round($r,1);
+  $c=0;
+  for($a=0;$a<=$ar;$a+=0.1){
+   $c++;
+  }
+  $b=360/($c*4);
+  if($b>90 || $b<0){
+   $b=3;
+  }
+  for($i=0;$i<=90;$i+=$b){
+   $x=$r*cos(deg2rad($i));
+   $z=$r*sin(deg2rad($i));
+   $pos[]=array($x,0,$z);
+   $pos[]=array(-$z,0,$x);
+   $pos[]=array(-$x,0,-$z);
+   $pos[]=array($z,0,-$x);
+  }
+  unset($r,$data,$i,$x,$z);
+  return $pos;
+ }
+}
+?>