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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：
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