Home Backend Development PHP Tutorial PHP中利用GD实现的柱状图

PHP中利用GD实现的柱状图

Jun 23, 2016 pm 01:24 PM

PHP中利用GD实现的柱状图,自己写的一个画柱状图的类,上代码。

  1 <?php  2  Class Chart{  3     private $image; // 定义图像  4     private $title; // 定义标题  5     private $ydata; // 定义Y轴数据  6     private $xdata; // 定义X轴数据  7     private $color; // 定义条形图颜色  8     private $bgcolor; // 定义图片背景颜色  9     private $width; // 定义图片的宽 10     private $height; // 定义图片的长 11      12     /* 13      * 构造函数  14      * String title 图片标题 15      * Array xdata 索引数组,X轴数据 16      * Array ydata 索引数组,数字数组,Y轴数据 17      */ 18     function __construct($title,$xdata,$ydata) {         19         $this->title = $title; 20         $this->xdata = $xdata; 21         $this->ydata = $ydata; 22         $this->color = array('#058DC7', '#50B432', '#ED561B', '#DDDF00', '#24CBE5', '#64E572', '#FF9655', '#FFF263', '#6AF9C4'); 23     } 24      25     /* 26      * 公有方法,设置条形图的颜色  27      * Array color 颜色数组,元素取值为'#058DC7'这种形式 28      */ 29     function setBarColor($color){ 30         $this->color = $color; 31     } 32      33     /* 34      * 公有方法,画条形图  35      */ 36     function mkBarChart(){ 37         $ydataNum = $this->arrayNum($this->ydata); // 取得数据分组的个数 38         $max = $this->arrayMax($this->ydata); // 取得所有呈现数据的最大值 39         $multi = ($max > 100)? $max/100 : 1; // 如果最大数据是大于100的则进行缩小处理,获取 40         $barHeightMulti = 2.2; // 条形高缩放的比例 41         $barWidth = (16 - 2*($ydataNum - 1)) > 10 ? (16 - 2*($ydataNum - 1)) : 10; // 条的宽 42         $barSpace = 16; // 条之间的间距 43         $chartLeft = (1+strlen($max))*12; // 设置图片左边的margin 44          45         $barY = 250; // 初始化条形图的Y的坐标 46         // 设置图片的宽、高 47         $this->width = ($ydataNum*$barWidth + $barSpace)*count($this->xdata) + $chartLeft;  48         $this->height = 300;  49         $this->image = imagecreatetruecolor($this->width ,$this->height); // 准备画布 50         $this->bgcolor = imagecolorallocate($this->image,255,255,255); // 图片的背景颜色 51          52         // 设置条形图的颜色 53         $color = array(); 54         foreach($this->color as $col) { 55             $col = substr($col,1,strlen($col)-1); 56             $red = hexdec(substr($col,0,2)); 57             $green = hexdec(substr($col,2,2)); 58             $blue = hexdec(substr($col,4,2)); 59             $color[] = imagecolorallocate($this->image ,$red, $green, $blue); 60         } 61          62         // 设置线段的颜色、字体的颜色、字体的路径 63         $lineColor = imagecolorallocate($this->image ,0xcc,0xcc,0xcc); 64         $fontColor = imagecolorallocate($this->image, 0x95,0x8f,0x8f); 65         $fontPath = 'font/simsun.ttc'; 66          67         imagefill($this->image,0,0,$this->bgcolor); // 绘画背景 68          69         // 绘画图的分短线与左右边线 70         for($i = 0; $i < 6; $i++ ) { 71             imageline($this->image,$chartLeft-10,$barY-$barHeightMulti*$max/5/$multi*$i,$this->width,$barY-$barHeightMulti*$max/5/$multi*$i,$lineColor); 72             imagestring($this->image,4,5,$barY-$barHeightMulti*$max/5/$multi*$i-8,floor($max/5*$i),$fontColor); 73         }         74         imageline($this->image,$chartLeft-10,30,$chartLeft-10,$barY,$lineColor); 75         imageline($this->image,$this->width-1,30,$this->width-1,$barY,$lineColor); 76          77         // 绘画图的条形 78         foreach($this->ydata as $key => $val) { 79             if($ydataNum == 1) { 80                 // 一个系列数据时 81                 $barX = $chartLeft + 3 + ($barWidth+$barSpace)*$key; 82                 imagefilledrectangle($this->image,$barX,$barY-$barHeightMulti*$val/$multi,$barX+$barWidth,$barY,$color[$key%count($this->color)]); 83             }elseif($ydataNum > 1) { 84                 // 多个系列的数据时 85                 $cbarSpace = $barSpace + $barWidth*($ydataNum-1); 86                 foreach($val as $ckey => $cval) { 87                     $barX = $chartLeft + 3 + $barWidth*$key + $ckey*($cbarSpace+$barWidth); 88                     imagefilledrectangle($this->image,$barX,$barY-$barHeightMulti*$cval/$multi,$barX+$barWidth,$barY,$color[$key%count($this->color)]); 89                 } 90             } 91              92         } 93                  94         // 绘画条形图的x坐标的值 95         foreach($this->xdata as $key => $val) { 96             $barX = $chartLeft + ($ydataNum*$barWidth+$barSpace)*$key + $ydataNum*$barWidth/3; 97             imagettftext($this->image,10,-45,$barX,$barY+15,$fontColor,$fontPath,$this->xdata[$key]); 98         } 99         100         // 绘画标题101         $titleStart = ($this->width - 5.5*strlen($this->title))/2;102         imagettftext($this->image,11,0,$titleStart,20,$fontColor,$fontPath,$this->title);103         104         // 输出图片105         header("Content-Type:image/png");106         imagepng ( $this->image );107     }108     109     /*110      * 私有方法,当数组为二元数组时,统计数组的长度 111      * Array arr 要做统计的数组112      */113     private function arrayNum($arr) {114          $num = 0;115          if(is_array($arr)) {116             $num++;117             for($i = 0; $i < count($arr); $i++){118                 if(is_array($arr[$i])) {119                     $num = count($arr);120                     break;121                 }122             }123          }124          return $num;125     }126     127     /*128      * 私有方法,计算数组的深度 129      * Array arr 数组130      */131     private function arrayDepth($arr) {132          $num = 0;133          if(is_array($arr)) {134             $num++;135             for($i = 0; $i < count($arr); $i++){136                 if(is_array($arr[$i])) {137                     $num += $this->arrayDepth($arr[$i]);138                     break;139                 }140             }141          }142          return $num;143     }144     145     /*146      * 私有方法,找到一组中的最大值 147      * Array arr 数字数组148      */149      private function arrayMax($arr) {150         $depth = $this->arrayDepth($arr);151         $max = 0;152         if($depth == 1) {153             rsort($arr);154             $max = $arr[0];        155         }elseif($depth > 1) {156             foreach($arr as $val) {157                 if(is_array($val)) {158                     if($this->arrayMax($val) > $max) {159                         $max = $this->arrayMax($val);160                     }161                 }else{                    162                     if($val > $max){163                         $max = $val;164                     }165                 }    166             }            167         }168         return $max;169     }170     171     function arrayAver($arr) {172         $aver = array();173         foreach($arr as $val) {174             if(is_array($val)) {175                 $aver = array_merge($aver,$val);176             }else{177                 $aver[] = $val;178             }179         }180         return array_sum($aver)/count($aver);181         182     }183     // 析构函数184     function __destruct(){185         imagedestroy($this->image);186     }187  }188 ?><br /><br />这个类可以实现画一个系列的柱状图和多个系列的柱状图,如下:
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一个系列的柱状图
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<br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br />多个系列的柱状图
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