PHP對象編程實現3D餅圖

<?php
//公用函數
//把角度轉換為弧度
function deg2Arc($degrees) {
return($degrees * (pi()/180.0));
}
//RGB
function getRGB($color){
$R=($color>>16) & 0xff;
$G=($color>>8) & 0xff;
$B=($color) & 0xff;
return (array($R,$G,$B));
}
// 取得在橢圓心為（0，0）的橢圓上 x,y點的值
function pie_point($deg,$va,$vb){
$x= cos(deg2Arc($deg)) * $va;
$y= sin(deg2Arc($deg)) * $vb;
return (array($x, $y));
}
//3D餅圖類
class Pie3d{
var $a; //橢圓長半軸
var $b; //橢圓短半軸
var $DataArray; //每個扇形的資料
var $ColorArray; //每個扇形的顏色 要求按照十六進位書寫但前面不加0x
//為邊緣及陰影為黑色
function Pie3d($pa=100,$pb=60,$sData="100,200,300,400,500", $sColor="ee00ff,dd0000,cccccc,ccff00,00ccff")
{
$this->a=$pa;
$this->b=$pb;
$this->DataArray=split(",",$sData);
$this->ColorArray=split(",",$sColor);
}
function setA($v){
$this->a=$v;
}
function getA(){
return $this->a;
}
function setB($v){
$this->b=$v;
}
function getB(){
return $this->b;
}
function setDataArray($v){
$this->DataArray=split(",",$v);
}
function getDataArray($v){
return $this->DataArray;
}
function setColorArray($v){
$this->ColorArray=split(",",$v);
}
function getColorArray(){
return $this->ColorArray;
}

function DrawPie(){
$image=imagecreate($this->a*2+40,$this->b*2+40);
$PieCenterX=$this->a+10;
$PieCenterY=$this->b+10;
$DoubleA=$this->a*2;
$DoubleB=$this->b*2;
list($R,$G,$B)=getRGB(0);
$colorBorder=imagecolorallocate($image,$R,$G,$B);