PHP中用GD绘制饼图

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PHP中用GD绘制饼图，绘制的类见代码：

 Class Chart{
     private $image; // 定义图像
     private $title; // 定义标题
     private $ydata; // 定义Y轴数据
     private $xdata; // 定义X轴数据
     private $color; // 定义条形图颜色
     private $bgcolor; // 定义图片背景颜色
     private $width; // 定义图片的宽
     private $height; // 定义图片的长

     /*
      * 构造函数
      * String title 图片标题
      * Array xdata 索引数组，X轴数据
      * Array ydata 索引数组，数字数组,Y轴数据
      */
     function __construct($title,$xdata,$ydata) {
         $this->title = $title;
         $this->xdata = $xdata;
         $this->ydata = $ydata;
         $this->color = array('#058DC7', '#50B432', '#ED561B', '#DDDF00', '#24CBE5', '#64E572', '#FF9655', '#FFF263', '#6AF9C4');
     }

     /*
      * 公有方法，设置条形图的颜色
      * Array color 颜色数组,元素取值为'#058DC7'这种形式
      */
     function setBarColor($color){
         $this->color = $color;
     }

     /*
      * 绘制饼图
      */
     function mkPieChart() {
         $sum = array_sum($this->ydata); // 获取ydata所有元素之和
         $start = 0; // 弧的开始角度
         $end = 0; // 弧的结束角度
         $pieWidth =  300; // 椭圆的长轴
         $pieHeight = 220; // 椭圆的短轴
         $space = 40; // 椭圆与小矩形的间距
         $margin = 20; // 图片的边距
         $recWidth = 20; // 小矩形的宽
         $recHeight = 15; // 小矩形的高
         $titleHeight = 50; // 标题区域的高
         // 图片自适应宽与高
         $this->width = $pieWidth + $this->arrayLengthMax($this->xdata)*10*4/3 + $space + $recWidth +$margin;
         $this->height =  (($pieHeight > count($this->xdata)*25 ) ? $pieHeight : count($this->xdata)*25) + $titleHeight;
         // 椭圆中心的坐标
         $cx = $pieWidth/2+$margin;
         $cy = $pieHeight/2+$titleHeight;

         $this->image = imagecreatetruecolor($this->width ,$this->height); // 准备画布
         $this->bgcolor = imagecolorallocate($this->image,255,255,255); // 图片的背景颜色
         imagefill($this->image,0,0,$this->bgcolor); // 填充背景

         // 设置条形图的颜色
         $color = array();
         foreach($this->color as $col) {
             $col = substr($col,1,strlen($col)-1);
             $red = hexdec(substr($col,0,2));
             $green = hexdec(substr($col,2,2));
             $blue = hexdec(substr($col,4,2));
             $color[] = imagecolorallocate($this->image ,$red, $green, $blue);
         }

         // 设置线段的颜色、字体的颜色、字体的路径
         $lineColor = imagecolorallocate($this->image ,0xcc,0xcc,0xcc);
         $fontColor = imagecolorallocate($this->image, 0x95,0x8f,0x8f);
         $fontPath = 'font/simsun.ttc';

         // 绘制扇形弧
         for($i = 0; $i < 10; $i++) {
             foreach($this->ydata as $key => $val) {
                 $end += 360*$val/$sum;
                 imagefilledarc($this->image,$cx,$cy-$i,$pieWidth,$pieHeight, $start,$end,$color[$key%count($this->color)],IMG_ARC_PIE);
                 $start = $end;
             }
         }

         // 绘制小矩形及之后文字说明
         $x1 = $pieWidth+$space;
         $y1 = $titleHeight ;
         foreach($this->ydata as $key => $val) {
             imagefilledrectangle($this->image,$x1,$y1,$x1+$recWidth,$y1+$recHeight,$color[$key%count($this->color)]);
             imagettftext($this->image,10,0,$x1+$recWidth+5,$y1+$recHeight-2,$fontColor,$fontPath,$this->xdata[$key]);
             $y1 += $recHeight + 10;
         }

         // 绘画标题
         $titleStart = ($this->width - 5.5*strlen($this->title))/2;
         imagettftext($this->image,11,0,$titleStart,20,$fontColor,$fontPath,$this->title);

         // 输出图片
         header("Content-Type:image/png");
         imagepng($this->image);
     } 

     /*
      * 私有方法，求数组中元素长度最大的值
      * Array arr 字符串数组，必须是汉字
      */
     private function arrayLengthMax($arr) {
         $length = 0;
         foreach($arr as $val) {
             $length = strlen($val) > $length ? strlen($val) : $length;
         }
         return $length/3;
     } 

     // 析构函数
     function __destruct(){
         imagedestroy($this->image);
     }
  }

测试代码如下：

 $xdata = array('测试一','测试二','测试三','测试四','测试五','测试六','测试七','测试八','测试九');
 $ydata = array(89,90,90,23,35,45,56,23,56);
 $Img = new Chart($title,$xdata,$ydata);
 $Img->mkPieChart();

效果图如下：

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" 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