php中用GD绘制折线图

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

/*
* 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
* Array series_name 索引数组，数据系列名称
*/
function __construct($title,$xdata,$ydata,$seriesName) {
$this->title = $title;
$this->xdata = $xdata;
$this->ydata = $ydata;
$this->seriesName = $seriesName;
$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;
}
/*
* 绘制折线图
*/
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 > 100)? $max : 100;
$multi = $max/100; // 如果最大数据是大于100的则进行缩小处理
$barHeightMulti = 2.2; // 条形高缩放的比例
$lineWidth = 50;
$chartLeft = (1+strlen($max))*12; // 设置图片左边的margin

$lineY = 250; // 初始化条形图的Y的坐标
// 设置图片的宽、高
//$this->width = $lineWidth*count($this->xdata) + $chartLeft - $lineWidth/1.6;

$margin = 10; // 小矩形描述右边margin
$recWidth = 20; // 小矩形的宽
$recHeight = 15; // 小矩形的高
$space = 20; // 小矩形与条形图的间距
$tmpWidth = 0;
// 设置图片的宽、高
$lineChartWidth =  $lineWidth*count($this->xdata) + $chartLeft - $lineWidth/1.6 ;
// 两个系列数据以上的加上小矩形的宽
if($ydataNum > 1) {
$tmpWidth = $this->arrayLengthMax($this->seriesName)*10*4/3 + $space + $recWidth + + $margin;
}
$this->width = $lineChartWidth + $tmpWidth;

$this->height = 300;
$this->image = imagecreatetruecolor($this->width ,$this->height); // 准备画布
$this->bgcolor = imagecolorallocate($this->image,255,255,255); // 图片的背景颜色

// 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';

imagefill($this->image,0,0,$this->bgcolor); // 绘画背景

// 绘画图的分短线与左右边线
for($i = 0; $i < 6; $i++ ) {
imageline($this->image,$chartLeft-10,$lineY-$barHeightMulti*$max/5/$multi*$i,$lineChartWidth,$lineY-$barHeightMulti*$max/5/$multi*$i,$lineColor);
imagestring($this->image,4,5,$lineY-$barHeightMulti*$max/5/$multi*$i-8,floor($max/5*$i),$fontColor);
}
imageline($this->image,$chartLeft-10,30,$chartLeft-10,$lineY,$lineColor);
imageline($this->image,$lineChartWidth-1,30,$lineChartWidth-1,$lineY,$lineColor);
$style = array($lineColor,$lineColor,$lineColor,$lineColor,$lineColor,$this->bgcolor,$this->bgcolor,$this->bgcolor,$this->bgcolor,$this->bgcolor);
imagesetstyle($this->image,$style);

// 绘制折线图的分隔线（虚线）
foreach($this->xdata as $key => $val) {
$lineX = $chartLeft + 3 + $lineWidth*$key;
imageline($this->image,$lineX,30,$lineX,$lineY,IMG_COLOR_STYLED);
}

// 绘画图的折线
foreach($this->ydata as $key => $val) {
if($ydataNum == 1) {
// 一个系列数据时
if($key == count($this->ydata) - 1 ) break;
$lineX = $chartLeft + 3 + $lineWidth*$key;
$lineY2 = $lineY-$barHeightMulti*($this->ydata[$key+1])/$multi;

// 画折线
if($key == count($this->ydata) - 2 ) {
imagefilledellipse($this->image,$lineX+$lineWidth,$lineY2,10,10,$color[0]);
}
imageline($this->image,$lineX,$lineY-$barHeightMulti*$val/$multi,$lineX+$lineWidth,$lineY2,$color[0]);
imagefilledellipse($this->image,$lineX,$lineY-$barHeightMulti*$val/$multi,10,10,$color[0]);
}elseif($ydataNum > 1) {
// 多个系列的数据时
foreach($val as $ckey => $cval) {

if($ckey == count($val) - 1 ) break;
$lineX = $chartLeft + 3 + $lineWidth*$ckey;
$lineY2 = $lineY-$barHeightMulti*($val[$ckey+1])/$multi;
// 画折线
if($ckey == count($val) - 2 ) {
imagefilledellipse($this->image,$lineX+$lineWidth,$lineY2,10,10,$color[$key%count($this->color)]);
}
imageline($this->image,$lineX,$lineY-$barHeightMulti*$cval/$multi,$lineX+$lineWidth,$lineY2,$color[$key%count($this->color)]);
imagefilledellipse($this->image,$lineX,$lineY-$barHeightMulti*$cval/$multi,10,10,$color[$key%count($this->color)]);
}
}

}

// 绘画条形图的x坐标的值
foreach($this->xdata as $key => $val) {
$lineX = $chartLeft + $lineWidth*$key + $lineWidth/3 - 20;
imagettftext($this->image,10,-65,$lineX,$lineY+15,$fontColor,$fontPath,$this->xdata[$key]);
}

// 两个系列数据以上时绘制小矩形及之后文字说明
if($ydataNum > 1) {
$x1 = $lineChartWidth + $space;
$y1 = 20 ;
foreach($this->seriesName 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,$this->seriesName[$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，当数组为二元数组时，统计数组的长度
* Array arr 要做统计的数组
*/
private function arrayNum($arr) {
$num = 0;
if(is_array($arr)) {
$num++;
for($i = 0; $i < count($arr); $i++){
if(is_array($arr[$i])) {
$num = count($arr);
break;
}
}
}
return $num;
}

/*
* 私有方法，计算数组的深度
* Array arr 数组
*/
private function arrayDepth($arr) {
$num = 0;
if(is_array($arr)) {
$num++;
for($i = 0; $i < count($arr); $i++){
if(is_array($arr[$i])) {
$num += $this->arrayDepth($arr[$i]);
break;
}
}
}
return $num;
}

/*
* 私有方法，找到一组中的最大值
* Array arr 数字数组
*/
private function arrayMax($arr) {
$depth = $this->arrayDepth($arr);
$max = 0;
if($depth == 1) {
rsort($arr);
$max = $arr[0];
}elseif($depth > 1) {
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;
}

/*
* 私有方法，求数组的平均值
* Array arr 数字数组
*/
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);
}

/*
* 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);
}
}

$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(29,30,45,54,65,45,76,23,54),array(89,60,90,23,35,45,56,23,56));
$color = array();
$seriesName = array("七月","八月");
$title = "测试数据";
$Img = new Chart($title,$xdata,$ydata,$seriesName);
7  $Img->paintLineChart();