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PHP对象编程实现3D饼图

 2000-12-11 16:27:37 来源:WEB开发网   
核心提示:<?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; $G=($col
<?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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Tags:PHP 对象 编程

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