/*-------------------------------------------------------------------------*/
//
// Module Name: 一个3D的饼图类
//
// Author:Avenger(avenger@php.net) Last Modify: 2002-10-30 11:19
// Copyright (c) 2002 by Avenger
/*-------------------------------------------------------------------------*/

//公用函数部分

//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
var $Fize; //字体大小
//为边缘及阴影为黑色

function Pie3d($pa=60,$pb=30,$sData="100,200,300,400,500", $sColor="ee00ff,dd0000,cccccc,ccff00,00ccff",$fontsize=1) {
$this->a=$pa;
$this->b=$pb;
$this->DataArray=split(",",$sData);
$this->ColorArray=split(",",$sColor);
$this->Fsize=$fontsize;
}

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(){
$fsize=$this->Fsize;
$image=imagecreate($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

//填充背景
imagefill($image, 0, 0, imagecolorallocate($image, 255, 255, 255));

/*
** 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,$fsize,floor($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);
}
}
}

//输出生成的图片
imagepng($image,'consture.png');
imagedestroy($image);
}//End drawPie()
}//End class
$pie = new Pie3d;
$pie->Pie3d($pa=300,$pb=150,$sData="100,200,300,400,500", $sColor="ee00ff,dd0000,cccccc,ccff00,ddddaa",$fontsize=5);
$pie->DrawPie();
echo '<img src="consture.png" border=0 alt="交易分析图">';

?>