PHP中使用GD库绘制折线图 折线统计图的绘制方法

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 $seriesName; // 定义每个系列数据的名称
  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
  
  function __construct($title,$xdata,$ydata,$seriesName) {  
   $this->title = $title;
   $this->xdata = $xdata;
   $this->ydata = $ydata;
   $this->seriesName = $seriesName;
   $this->color = array('#DC', '#B', '#EDB', '#DDDF', '#CBE', '#E', '#FF', '#FFF', '#AFC');
  }
  
  function setBarColor($color){
   $this->color = $color;
  }
 
  public function paintLineChart() {
   $ydataNum = $this->arrayNum($this->ydata); // 取得数据分组的个数
   $max = $this->arrayMax($this->ydata); // 取得所有呈现数据的最大值
   $max = ($max > )? $max : ;
   $multi = $max/; // 如果最大数据是大于的则进行缩小处理  
   $barHeightMulti = .; // 条形高缩放的比例
   $lineWidth = ;
   $chartLeft = (+strlen($max))*; // 设置图片左边的margin
   $lineY = ; // 初始化条形图的Y的坐标
   // 设置图片的宽、高
   //$this->width = $lineWidth*count($this->xdata) + $chartLeft - $lineWidth/.; 
   $margin = ; // 小矩形描述右边margin
   $recWidth = ; // 小矩形的宽
   $recHeight = ; // 小矩形的高
   $space = ; // 小矩形与条形图的间距
   $tmpWidth = ;
   // 设置图片的宽、高
   $lineChartWidth = $lineWidth*count($this->xdata) + $chartLeft - $lineWidth/. ;
   // 两个系列数据以上的加上小矩形的宽
   if($ydataNum > ) {
    $tmpWidth = $this->arrayLengthMax($this->seriesName)**/ + $space + $recWidth + + $margin;
   } 
   $this->width = $lineChartWidth + $tmpWidth; 
   $this->height = ; 
   $this->image = imagecreatetruecolor($this->width ,$this->height); // 准备画布
   $this->bgcolor = imagecolorallocate($this->image,,,); // 图片的背景颜色
   // 设置条形图的颜色
   $color = array();
   foreach($this->color as $col) {
    $col = substr($col,,strlen($col)-);
    $red = hexdec(substr($col,,));
    $green = hexdec(substr($col,,));
    $blue = hexdec(substr($col,,));
    $color[] = imagecolorallocate($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 ,xcc,xcc,xcc);
   $fontColor = imagecolorallocate($this->image, x,xf,xf);
   $fontPath = 'font/simsun.ttc';
   imagefill($this->image,,,$this->bgcolor); // 绘画背景
   // 绘画图的分短线与左右边线
   for($i = ; $i < ; $i++ ) {
    imageline($this->image,$chartLeft-,$lineY-$barHeightMulti*$max//$multi*$i,$lineChartWidth,$lineY-$barHeightMulti*$max//$multi*$i,$lineColor);
    imagestring($this->image,,,$lineY-$barHeightMulti*$max//$multi*$i-,floor($max
  private function arrayNum($arr) {
   $num = ;
   if(is_array($arr)) {
    $num++;
    for($i = ; $i < count($arr); $i++){
     if(is_array($arr[$i])) {
      $num = count($arr);
      break;
     }
    }
   }
   return $num;
  }
  
  private function arrayDepth($arr) {
   $num = ;
   if(is_array($arr)) {
    $num++;
    for($i = ; $i < count($arr); $i++){
     if(is_array($arr[$i])) {
      $num += $this->arrayDepth($arr[$i]);
      break;
     }
    }
   }
   return $num;
  }
  
  private function arrayMax($arr) {
   $depth = $this->arrayDepth($arr);
   $max = ;
   if($depth == ) {
    rsort($arr);
    $max = $arr[];  
   }elseif($depth > ) {
    foreach($arr as $val) {
     if(is_array($val)) {
      if($this->arrayMax($val) > $max) {
       $max = $this->arrayMax($val);
      }
     }else{     
      if($val > $max){
       $max = $val;
      }
     } 
    }   
   }
   return $max;
  }
  
  function arrayAver($arr) {
   $aver = array();
   foreach($arr as $val) {
    if(is_array($val)) {
     $aver = array_merge($aver,$val);
    }else{
     $aver[] = $val;
    }
   }
   return array_sum($aver)/count($aver);
  }
  
  private function arrayLengthMax($arr) {
   $length = ;
   foreach($arr as $val) {
    $length = strlen($val) > $length ? strlen($val) : $length;
   }
   return $length/;
  } 
  // 析构函数
  function __destruct(){
   imagedestroy($this->image);
  }
 }

 $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(array(,,,,,,,,),array(,,,,,,,,));
 $color = array();
 $seriesName = array("七月","八月");
 $title = "测试数据";
 $Img = new Chart($title,$xdata,$ydata,$seriesName);
 $Img->paintLineChart();

$white=imagecolorallocate($img,0xFF,0xFF,0xFF)或者可以使用RGB的颜色命名方式 如$white=imagecolorallocate($img,255,255,255);

$gray = imagecolorallocate($img, 0xC0, 0xC0, 0xC0);
$darkgray = imagecolorallocate($img, 0x90, 0x90, 0x90);
$navy = imagecolorallocate($img, 0x00, 0x00, 0x80);
$darknavy = imagecolorallocate($img, 0x00, 0x00, 0x50);
$red = imagecolorallocate($img, 0xFF, 0x00, 0x00);
$darkred = imagecolorallocate($img, 0x90, 0x00, 0x00);
$black=imagecolorallocate($img,0x00,0x00,0x00);