<?php
//最后一次修改:2004-6-21
//一个生成矩形图，曲线图的图形分析类
//作者：tonera
//说明：
//任何人可在任何场合自由使用这个类。但由此所发生的损害跟作者无关。
//可根据数据自适应X和Y轴大小。
//在同一个图形中可显示多个曲线图
//用户可给出生成的图的尺寸大小，数据参数。类根据数据的值来判断生成的图形的高（默认10格）和宽各分几格。
//若用户没有给出图的尺寸大小，则图形高和宽为255像素
//数据参数通过一个方法add_data($array)来多次添加，每次一个数组。
//可自设定图形边框，矩形图内线，深色边框线，浅色边框线，曲线，点的颜色。若用户没有指定，则为默认值
//set_colors方法设定不同曲线的不同色彩
//可进行图形的叠加显示:点，线，矩形
//注意：需要GD库支持


class build_graph {
        var $graphwidth = 300;
        var $graphheight = 300;
        var $width_num = 0;                //宽分多少等分
        var $height_num = 10;                //高分多少等分，默认为10
        var $height_var = 0;                //高度增量（用户数据平均数）
        var $width_var=0;                //宽度增量（用户数据平均数）
        var $height_max=0;                //最大数据值
        var $array_data=array();          //用户待分析的数据的二维数组
        var $array_error=array();          //收集错误信息

        var $colorBg=array(255,255,255);    //图形背景-白色
        var $colorGrey=array(192,192,192);    //灰色画框
        var $colorBlue=array(0,0,255);       //蓝色
        var $colorRed=array(255,0,0);       //红色（点）
        var $colorDarkBlue=array(0,0,255);    //深色
        var $colorLightBlue=array(200,200,255);       //浅色
        var $colorLightBlack = array(138,138,120); //浅黑
        var $colorBlack = array(30,30,30); //黑
        var $rgbArray = array("ee00ff","dd8800","00ff00","104E8B");

        var $array_color;                //曲线着色（存储十六进制数）
        var $image;                      //我们的图像
        var $lineType = ''; //画底线时标的数字值，则x的值,范围为'day', 'hour'两值
        var $beginDay = '';


        //方法：接受用户数据
        function add_data($array_user_data, $dataKey = 0){
                if(!is_array($array_user_data)){
                        $array_user_data = array();
                }
                if(!is_array($array_user_data) or empty($array_user_data)){
                        $this->array_error['add_data']="没有可供分析的数据";
                        return false;
                        exit();
                }
                if($dataKey == 0 || array_key_exists($dataKey, $this->array_data)){
                        $dataKey = count($this->array_data);
                }
                $this->array_data[$dataKey] = $array_user_data;
        }

        //方法：定义画布宽和长
        function set_img($img_width,$img_height){
                $this->graphwidth = $img_width;
                $this->graphheight = $img_height;
        }

        //设定Y轴的增量等分，默认为10份
        function set_height_num($var_y){
                $this->height_num=$var_y;
        }

        //定义各图形各部分色彩
        function get_RGB($color){             //得到十进制色彩
                $R=($color>>16) & 0xff;
                $G=($color>>8) & 0xff;
                $B=($color) & 0xff;
                return (array($R,$G,$B));
        }
        //---------------------------------------------------------------
        #定义背景色
        function set_color_bg($c1,$c2,$c3){
                $this->colorBg=array($c1,$c2,$c3);
        }
        #定义画框色
        function set_color_Grey($c1,$c2,$c3){
                $this->colorGrey=array($c1,$c2,$c3);
        }
        #定义蓝色
        function set_color_Blue($c1,$c2,$c3){
                $this->colorBlue=array($c1,$c2,$c3);
        }
        #定义色Red
        function set_color_Red($c1,$c2,$c3){
                $this->colorRed=array($c1,$c2,$c3);
        }
        #定义深色
        function set_color_DarkBlue($c1,$c2,$c3){
                $this->colorDarkBlue=array($c1,$c2,$c3);
        }
        #定义浅色
        function set_color_LightBlue($c1,$c2,$c3){
                $this->colorLightBlue=array($c1,$c2,$c3);
        }

        //设定画底线时标的数字值，则x的值,范围为'day', 'hour'两值
        function  setLineStrinType($type){
                if(!in_array($type, array('day', 'hour'))){
                        return false;
                }
                $this->lineType = $type;
        }

        //---------------------------------------------------------------

        //方法:由用户数据将画布分成若干等份宽
        //并计算出每份多少像素
        function get_width_num(){
                $dataCount = array();
                foreach ($this->array_data as $key => $oneData){
                        $dataCount[] = count($oneData);
                }

                $this->width_num = max($dataCount);
        }
        function get_max_height(){
                //获得用户数据的最大值
                $tmpvar = array();
                foreach($this->array_data as $tmp_value){
                        $tmpvar[]= max($tmp_value);
                }
                if(isset($tmpvar[0])){
                        $more = $tmpvar[0];
                }
                $this->height_max = max($tmpvar) + $this->height_var;
                return max($tmpvar);
        }
        function get_height_length(){
                //计算出每格的增量长度(用户数据，而不是图形的像素值)
                $max_var = $this->get_max_height();
                $max_var = round($max_var/$this->height_num);
                $first_num = substr($max_var,0,1);
                if(substr($max_var,1,1)){
                        if(substr($max_var,1,1)>=5)
                        $first_num += 1;
                }
                for($i = 1; $i < strlen($max_var); $i++){
                        $first_num .= "0";
                }
                return (int)$first_num;
        }
        function get_var_wh(){          //得到高和宽的增量
                $this->get_width_num();
                //得到高度增量和宽度增量
                $this->height_var = $this->get_height_length();
                $this->width_var = round($this->graphwidth/$this->width_num, 3);
        }

        function set_colors($str_colors){
                //用于多条曲线的不同着色，如$str_colors="ee00ff,dd0000,cccccc"
                $this->array_color = split(",",$str_colors);
        }

        function set_begin_day($beginDay){
                if(!is_numeric($beginDay)){
                        return false;
                }
                $this->beginDay = $beginDay;
        }

        ######################################################################################################
        function build_line($var_num){
                if(!empty($var_num)){                   //如果用户只选择显示一条曲线
                        $array_tmp[0] = $this->array_data[$var_num-1];
                        $this->array_data = $array_tmp;
                }

                for($j=0;$j<count($this->array_data);$j++){
                        list($R,$G,$B)=$this->get_RGB(hexdec($this->array_color[$j]));
                        $colorBlue=imagecolorallocate($this->image,$R,$G,$B);

                        for($i = 0;$i < $this->width_num - 1;$i++){
                                $height_pix = round(($this->array_data[$j][$i]/$this->height_max)*$this->graphheight);
                                $height_next_pix = round($this->array_data[$j][$i + 1]/$this->height_max*$this->graphheight);
                                imageline($this->image,$this->width_var*($i + 1),$this->graphheight-$height_pix,$this->width_var*($i + 2),$this->graphheight-$height_next_pix,$colorBlue);
                        }
                }
                //画点
                $colorRed = imagecolorallocate($this->image, $this->colorBlue[0], $this->colorBlue[1], $this->colorBlue[2]);
                
                for($j = 0; $j < count($this->array_data); $j++){
                        list($R,$G,$B) = $this->get_RGB(hexdec($this->array_color[$j]));
                        $colorPoint = imagecolorallocate($this->image,$R,$G,$B);

                        for($i = 0; $i < $this->width_num; $i++){
                                if(isset($this->array_data[$j][$i])){
                                        $height_pix = round(($this->array_data[$j][$i]/$this->height_max)*$this->graphheight);
                                        $arcRet = imagearc($this->image,$this->width_var*($i + 1),$this->graphheight-$height_pix,6,5,0,360,$colorPoint);
                                        $borderRet = imagefilltoborder($this->image,$this->width_var*($i + 1),$this->graphheight-$height_pix,$colorPoint,$colorPoint);
                                        if(!$arcRet || !$borderRet){
                                                break;
                                        }
                                }
                        }
                }

                for($j = 0; $j < count($this->array_data); $j++){
                        list($R,$G,$B) = $this->get_RGB(hexdec($this->array_color[$j]));
                        $colorPoint = imagecolorallocate($this->image,$R,$G,$B);
                        for($i = 0; $i < $this->width_num; $i++){
                                $height_pix = round(($this->array_data[$j][$i]/$this->height_max) * $this->graphheight);
                                $arcRet = imagearc($this->image,$this->width_var*($i + 1),$this->graphheight-$height_pix,6,5,0,360,$colorPoint);
                                $arcRet = imagefilltoborder($this->image,$this->width_var*($i + 1),$this->graphheight-$height_pix,$colorPoint,$colorPoint);
                                if(!$arcRet || !$borderRet){
                                        break;
                                }
                        }
                }
                
        }

        ######################################################################################################
        function build_rectangle($select_gra){
                if(!empty($select_gra)){                   //用户选择显示一个矩形
                        $select_gra-=1;
                }
                //画矩形
                //配色
                $colorDarkBlue=imagecolorallocate($this->image, $this->colorDarkBlue[0], $this->colorDarkBlue[1], $this->colorDarkBlue[2]);
                $colorLightBlue=imagecolorallocate($this->image, $this->colorLightBlue[0], $this->colorLightBlue[1], $this->colorLightBlue[2]);

                if(empty($select_gra))
                $select_gra=0;
                for($i=0; $i<$this->width_num; $i++){
                        $height_pix=round(($this->array_data[$select_gra][$i]/$this->height_max)*$this->graphheight);
                        imagefilledrectangle($this->image,$this->width_var*$i,$this->graphheight-$height_pix,$this->width_var*($i+1),$this->graphheight, $colorDarkBlue);
                        imagefilledrectangle($this->image,($i*$this->width_var)+1,($this->graphheight-$height_pix)+1,$this->width_var*($i+1)-5,$this->graphheight-2, $colorLightBlue);
                }
        }

        ######################################################################################################
        function create_cloths(){
                //创建画布
                $this->image = imagecreate($this->graphwidth+20,$this->graphheight+20);
        }
        function create_frame(){
                //创建画框
                $this->get_var_wh();
                //配色
                $colorBg=imagecolorallocate($this->image, $this->colorBg[0], $this->colorBg[1], $this->colorBg[2]);
                $colorGrey=imagecolorallocate($this->image, $this->colorGrey[0], $this->colorGrey[1], $this->colorGrey[2]);
                //创建图像周围的框
                imageline($this->image, 0, 0, 0, $this->graphheight,$colorGrey);
                imageline($this->image, 0, 0, $this->graphwidth, 0,$colorGrey);
                //imageline($this->image, ($this->graphwidth-1),0,($this->graphwidth-1),($this->graphheight-1),$colorGrey);
                imageline($this->image, 0,($this->graphheight-1),($this->graphwidth-1),($this->graphheight-1),$colorGrey);
        }
        function create_line(){
                //创建网格。
                $this->get_var_wh();
                $colorBg = imagecolorallocate($this->image, $this->colorBg[0], $this->colorBg[1], $this->colorBg[2]);
                $colorGrey = imagecolorallocate($this->image, $this->colorGrey[0], $this->colorGrey[1], $this->colorGrey[2]);
                $colorRed = imagecolorallocate($this->image, $this->colorRed[0], $this->colorRed[1], $this->colorRed[2]);
                $colorLightBlack = imagecolorallocate($this->image, $this->colorLightBlack[0], $this->colorLightBlack[1], $this->colorLightBlack[2]);
                $colorBlack = imagecolorallocate($this->image, $this->colorBlack[0], $this->colorBlack[1], $this->colorBlack[2]);
                for($i = 1 ;$i <= $this->height_num + 5; $i++){
                        //画横线
                        imageline($this->image,0,$this->graphheight-($this->height_var/$this->height_max*$this->graphheight)*$i,$this->graphwidth,$this->graphheight-($this->height_var/$this->height_max*$this->graphheight)*$i,$colorGrey);
                        //标出数字
                        imagestring($this->image,2,0,$this->graphheight-($this->height_var/$this->height_max*$this->graphheight)*$i,$this->height_var*$i,$colorLightBlack);
                }
                $type = $this->lineType;
                if($type == "day"){
                        if($this->beginDay){
                                $j = $this->beginDay;
                        }else{
                                $j = 1;
                        }
                }elseif($type == "hour"){
                        $j = 0;
                }
                for($i = 1;$i <= $this->width_num; $i++){
                        //画竖线
                        imageline($this->image,$this->width_var*$i,0,$this->width_var*$i,$this->graphwidth,$colorGrey);
                        //标出数字
                        if($type == 'day'){
                                if($i == 1){
                                        imagestring($this->image,2,$this->width_var*$i,$this->graphheight-15,$j,$colorBlack);
                                }
                                imagestring($this->image,2,$this->width_var*($i + 1),$this->graphheight-15,$j + 1,$colorBlack);
                        }elseif($type == 'hour'){
                                if($i == 1){
                                        imagestring($this->image,2,$this->width_var*$i,$this->graphheight-15,$j,$colorBlack);
                                }
                                imagestring($this->image,2,$this->width_var*($i + 1),$this->graphheight-15,$j + 1,$colorBlack);
                        }else{
                                imagestring($this->image,2,$this->width_var*($i + 1),$this->graphheight-15,$i,$colorBlack);
                        }
                        $j++;
                        if($type == "day" && $j == 31){
                                 $j = 1;
                        }elseif($type == "hour" && $j == 23){
                                $j = -1;
                        }
                }
        }

        function build($graph,$str_var, $outpwd = ""){
                //$graph是用户指定的图形种类,$str_var是生成哪个数据的图
                if(empty($outpwd)){
                        header("Content-type: image/jpeg");
                }
                $this->create_cloths();          //先要有画布啊~~
                switch ($graph){
                        case "line":
                                $this->create_frame();          //画个框先：）
                                $this->create_line();          //打上底格线
                                $this->build_line($str_var);          //画曲线
                                break;
                        case "rectangle":
                                $this->create_frame();                   //画个框先：）
                                $this->build_rectangle($str_var);          //画矩形
                                $this->create_line();                   //打上底格线
                                break;
                }
                //输出图形并清除内存
                if(!empty($outpwd)){
                        imagepng($this->image, $outpwd);
                }else{
                        imagepng($this->image);
                }
                imagedestroy($this->image);
        }

        ######################################################################################################

}

第二种是用开源工具jpgraph，参见 http://jpgraph.net/features

非常多的例子，很好的。

第三种用 open flash chart,参见

http://teethgrinder.co.uk/open-flash-chart/gallery-data.php
http://www.helloweba.com/view-blog-41.html
http://www.phphi.cn/post/98/
http://blogold.chinaunix.net/u3/105169/showart_2322209.html
http://hi.baidu.com/duwuzhe722/blog/item/e11b2d2662b512038b82a175.html

第四种使用amcharts，参见http://www.amcharts.com