<?php

//公用函数

//把角度转换为弧度
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));
}

// 取得在椭圆心为（0，0）的椭圆上 x,y点的值
function pie_point($deg,$va,$vb){
$x= cos(deg2Arc($deg)) * $va;
$y= sin(deg2Arc($deg)) * $vb;
return (array($x, $y));
}


//3D饼图类

class Pie3d{

var $a; //椭圆长半轴
var $b; //椭圆短半轴
var $DataArray;  //每个扇形的数据
var $ColorArray; //每个扇形的颜色 要求按照十六进制书写但前面不加0x
//为边缘及阴影为黑色

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);
 $DataNumber=count($this->DataArray);
  
 //$DataTotal
 for($i=0;$i<$DataNumber;$i++)$DataTotal+=$this->DataArray[$i]; //算出数据和
  
 //填充背境
 imagefill($image, 0, 0, imagecolorallocate($image, 0xFF, 0xFF, 0xFF));

 /*
 ** 画每一个扇形
 */
 $Degrees = 0;
 for($i = 0; $i < $DataNumber; $i++){
  $StartDegrees = round($Degrees);
  $Degrees += (($this->DataArray[$i]/$DataTotal)*360);
  $EndDegrees = round($Degrees);
  $percent = number_format($this->DataArray[$i]/$DataTotal*100, 1);  
  list($R,$G,$B)=getRGB(hexdec($this->ColorArray[$i]));
  $CurrentColor=imagecolorallocate($image,$R,$G,$B);
  if ($R>60 and $R<256)$R=$R-60;
  if ($G>60 and $G<256)$G=$G-60;
  if ($B>60 and $B<256)$B=$B-60;
  $CurrentDarkColor=imagecolorallocate($image,$R,$G,$B);
  //画扇形弧
  imagearc($image,$PieCenterX,$PieCenterY,$DoubleA,$DoubleB,$StartDegrees,$EndDegrees,$CurrentColor);
  //画直线
  list($ArcX, $ArcY) = pie_point($StartDegrees , $this->a , $this->b);
  imageline($image,$PieCenterX,$PieCenterY,floor($PieCenterX + $ArcX),floor($PieCenterY + $ArcY),$CurrentColor);
  //画直线
  list($ArcX, $ArcY) = pie_point($EndDegrees,$this->a , $this->b);
  imageline($image,$PieCenterX,$PieCenterY,ceil($PieCenterX + $ArcX),ceil($PieCenterY + $ArcY),$CurrentColor);
  //填充扇形
  $MidPoint = round((($EndDegrees - $StartDegrees)/2) + $StartDegrees);
  list($ArcX, $ArcY) = Pie_point($MidPoint, $this->a*3/4 , $this->b*3/4);

  imagefilltoborder($image,floor($PieCenterX + $ArcX),floor($PieCenterY + $ArcY), $CurrentColor,$CurrentColor);
  imagestring($image,2,floor($PieCenterX + $ArcX-5),floor($PieCenterY + $ArcY-5),$percent."%",$colorBorder);

  //画阴影
  if ($StartDegrees>=0 and $StartDegrees<=180){
  if($EndDegrees<=180){  
for($k = 1; $k < 15; $k++)
 imagearc($image,$PieCenterX, $PieCenterY+$k,$DoubleA, $DoubleB, $StartDegrees, $EndDegrees, $CurrentDarkColor);
  }else{
for($k = 1; $k < 15; $k++)
 imagearc($image,$PieCenterX, $PieCenterY+$k,$DoubleA, $DoubleB, $StartDegrees, 180, $CurrentDarkColor);
  }

  }
}

 /*到此脚本已经生了一幅图像了
 **现在需要的是把它发到浏览器上，重要的一点是要将标头发给浏览器，让它知道是一个GIF文件。不然的话你只能看到一堆奇怪的乱码
 */  
 //输出生成的图片  
 header("Content-type: image/gif");
 imagegif($image);
 imagedestroy($image);
}//End drawPie()
}//End class


//实现

$objp = new Pie3d();
$objp->DrawPie();
?>  

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