PHP中用GD绘制饼图，gd绘制饼_PHP教程

PHP中用GD绘制饼图，gd绘制饼

PHP中用GD绘制饼图，绘制的类见代码：

  1 Class Chart{
  2     private $image; // 定义图像
  3     private $title; // 定义标题
  4     private $ydata; // 定义Y轴数据
  5     private $xdata; // 定义X轴数据
  6     private $color; // 定义条形图颜色
  7     private $bgcolor; // 定义图片背景颜色
  8     private $width; // 定义图片的宽
  9     private $height; // 定义图片的长
 10     
 11     /*
 12      * 构造函数 
 13      * String title 图片标题
 14      * Array xdata 索引数组，X轴数据
 15      * Array ydata 索引数组，数字数组,Y轴数据
 16      */
 17     function __construct($title,$xdata,$ydata) {        
 18         $this->title = $title;
 19         $this->xdata = $xdata;
 20         $this->ydata = $ydata;
 21         $this->color = array('#058DC7', '#50B432', '#ED561B', '#DDDF00', '#24CBE5', '#64E572', '#FF9655', '#FFF263', '#6AF9C4');
 22     }
 23     
 24     /*
 25      * 公有方法，设置条形图的颜色 
 26      * Array color 颜色数组,元素取值为'#058DC7'这种形式
 27      */
 28     function setBarColor($color){
 29         $this->color = $color;
 30     }
 31     
 32     /*
 33      * 绘制饼图
 34      */
 35     function mkPieChart() {
 36         $sum = array_sum($this->ydata); // 获取ydata所有元素之和
 37         $start = 0; // 弧的开始角度
 38         $end = 0; // 弧的结束角度
 39         $pieWidth =  300; // 椭圆的长轴
 40         $pieHeight = 220; // 椭圆的短轴
 41         $space = 40; // 椭圆与小矩形的间距
 42         $margin = 20; // 图片的边距
 43         $recWidth = 20; // 小矩形的宽
 44         $recHeight = 15; // 小矩形的高
 45         $titleHeight = 50; // 标题区域的高
 46         // 图片自适应宽与高
 47         $this->width = $pieWidth + $this->arrayLengthMax($this->xdata)*10*4/3 + $space + $recWidth +$margin;
 48         $this->height =  (($pieHeight > count($this->xdata)*25 ) ? $pieHeight : count($this->xdata)*25) + $titleHeight;
 49         // 椭圆中心的坐标
 50         $cx = $pieWidth/2+$margin;
 51         $cy = $pieHeight/2+$titleHeight;
 52         
 53         $this->image = imagecreatetruecolor($this->width ,$this->height); // 准备画布
 54         $this->bgcolor = imagecolorallocate($this->image,255,255,255); // 图片的背景颜色
 55         imagefill($this->image,0,0,$this->bgcolor); // 填充背景
 56         
 57         // 设置条形图的颜色
 58         $color = array();
 59         foreach($this->color as $col) {
 60             $col = substr($col,1,strlen($col)-1);
 61             $red = hexdec(substr($col,0,2));
 62             $green = hexdec(substr($col,2,2));
 63             $blue = hexdec(substr($col,4,2));
 64             $color[] = imagecolorallocate($this->image ,$red, $green, $blue);
 65         }
 66         
 67         // 设置线段的颜色、字体的颜色、字体的路径
 68         $lineColor = imagecolorallocate($this->image ,0xcc,0xcc,0xcc);
 69         $fontColor = imagecolorallocate($this->image, 0x95,0x8f,0x8f);
 70         $fontPath = 'font/simsun.ttc';
 71         
 72         // 绘制扇形弧 
 73         for($i = 0; $i < 10; $i++) {
 74             foreach($this->ydata as $key => $val) {
 75                 $end += 360*$val/$sum;
 76                 imagefilledarc($this->image,$cx,$cy-$i,$pieWidth,$pieHeight, $start,$end,$color[$key%count($this->color)],IMG_ARC_PIE);        
 77                 $start = $end;                
 78             }
 79         }
 80         
 81         // 绘制小矩形及之后文字说明
 82         $x1 = $pieWidth+$space;
 83         $y1 = $titleHeight ;
 84         foreach($this->ydata as $key => $val) {
 85             imagefilledrectangle($this->image,$x1,$y1,$x1+$recWidth,$y1+$recHeight,$color[$key%count($this->color)]);        
 86             imagettftext($this->image,10,0,$x1+$recWidth+5,$y1+$recHeight-2,$fontColor,$fontPath,$this->xdata[$key]);
 87             $y1 += $recHeight + 10;            
 88         }
 89         
 90         // 绘画标题
 91         $titleStart = ($this->width - 5.5*strlen($this->title))/2;
 92         imagettftext($this->image,11,0,$titleStart,20,$fontColor,$fontPath,$this->title);
 93         
 94         // 

输出图片 95 header("Content-Type:image/png"); 96 imagepng($this->image); 97 } 98 99 /* 100 * 私有方法，求数组中元素长度最大的值 101 * Array arr 字符串数组，必须是汉字 102 */ 103 private function arrayLengthMax($arr) { 104 $length = 0; 105 foreach($arr as $val) { 106 $length = strlen($val) > $length ? strlen($val) : $length; 107 } 108 return $length/3; 109 } 110 111 // 析构函数 112 function __destruct(){ 113 imagedestroy($this->image); 114 } 115 }

测试代码如下：

1 $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');
2 $ydata = array(89,90,90,23,35,45,56,23,56);
3 $Img = new Chart($title,$xdata,$ydata);
4 $Img->mkPieChart();

效果图如下：

http://www.bkjia.com/PHPjc/1063518.htmlwww.bkjia.comtruehttp://www.bkjia.com/PHPjc/1063518.htmlTechArticlePHP中用GD绘制饼图，gd绘制饼 PHP中用GD绘制饼图，绘制的类见代码： 1 Class Chart{ 2 private $image ; // 定义图像 3 private $title ; // 定义标题 4 priv...