php 圖處理函數執行個體教程

<?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 chart{

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 chart($pa=100,$pb=60,$sData="100,200,300,400,500,300", $sColor="ee00ff,dd0000,cccccc,ccff00,00ccff,ccff00")
{
    $this->a=$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]; //算出資料和
    
    //填充背境
    imagefill($image, 0, 0, imagecolorallocate($image, 0xFF, 0xFF, 0xFF));

    /*
    ** 畫每一個扇形
    */
    $Degrees = 0;
    for($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,$B);
        //畫扇形弧
        imagearc($image,$PieCenterX,$PieCenterY,$DoubleA,$DoubleB,$StartDegrees,$EndDegrees,$CurrentColor);
        //畫直線
        list($ArcX, $ArcY) = pie_point($StartDegrees , $this->a , $this->b);
        imageline($image,$PieCenterX,$PieCenterY,floor($PieCenterX + $ArcX),floor($PieCenterY + $ArcY),$CurrentColor);
        //畫直線
        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);

        //畫陰影
        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);
           }

        }
   }
        
    /*到此指令碼已經生了一幅映像了
    **現在需要的是把它發到瀏覽器上，重要的一點是要將標題發給瀏覽器，讓它知道是一個GIF檔案。不然的話你只能看到一堆奇怪的亂碼
    */ 
    //輸出產生的圖片    
    header("Content-type: image/gif");
    imagegif($image);
    imagedestroy($image);
}//End drawPie()
}//End class

//實現

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