查询了网上的各种方法，一个是某人自己写的一个画图类，不是很完善，但是对我这样的初学者还是有用的
<?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 /* //使用示例 $gg=new build_graph(); $d1=array(0,62,25,20,20,100,99); $d2=array(0,80,75,65,100,56,79); $d3=array(0,60,50,25,12,56,45); $gg->add_data($d1); $gg->add_data($d2); $gg->add_data($d3); $gg->set_colors("ee00ff,dd8800,00ff00"); //生成曲线图 $gg->build("line",0); //参数0表示显示所有曲线，1为显示第一条，依次类推 //生成矩形图 //$gg->build("rectangle","2"); //参数0表示显示第一个矩形，1也为显示第一条，其余依次类推 */ 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
