图片生成缩略图代码

图片生成缩略图代码

<?php
# Constants
define("IMAGE_BASE", './');
define("MAX_WIDTH", 150);
define("MAX_HEIGHT", 150);

# Get image locationstr_replace('..', '', $_SERVER['QUERY_STRING']);
$image_file = 't.jpg';
$image_path = IMAGE_BASE . "$image_file";

# Load image
$img = null;
$ext = strtolower(end(explode('.', $image_path)));
if ($ext == 'jpg' || $ext == 'jpeg') {
     $img = imagecreatefromjpeg($image_path);
} else if ($ext == 'png') {
     $img = @imagecreatefrompng($image_path);
# Only if your version of GD includes GIF support
} else if ($ext == 'gif') {
     $img = @imagecreatefrompng($image_path);
}

# If an image was successfully loaded, test the image for size
if ($img) {

     # Get image size and scale ratio
     $width = imagesx($img);
     $height = imagesy($img);
     $scale = min(MAX_WIDTH/$width, MAX_HEIGHT/$height);

     # If the image is larger than the max shrink it
     if ($scale < 1) {
         $new_width =150; //floor($scale*$width);
         $new_height =150;// floor($scale*$height);

         # Create a new temporary image
         $tmp_img = imagecreatetruecolor($new_width, $new_height);

         # Copy and resize old image into new image
         imagecopyresized($tmp_img, $img, 0, 0, 0, 0,$new_width, $new_height, $width, $height);
         imagedestroy($img);
         $img = $tmp_img;
     }
}

# Create error image if necessary
if (!$img) {
     $img = imagecreate(MAX_WIDTH, MAX_HEIGHT);
     imagecolorallocate($img,0,0,0);
     $c = imagecolorallocate($img,70,70,70 );
     imageline($img,0,0,MAX_WIDTH,MAX_HEIGHT,$c2);
     imageline($img,MAX_WIDTH,0,0,MAX_HEIGHT,$c2);
}

# Display the image
header("Content-type: image/jpeg");
imagejpeg($img);
imagedestroy($img);
?>

ob_start();
$start = microtime(true);
$src = imagecreatefromjpeg($_GET["imageurl"]);
$width = imagesx($src);
$height = imagesy($src);
$dst = imagecreatetruecolor(160, 120);
imagecopyresampled($dst,$src,0,0,0,0,160,120,$width,$height);
header('Content-Type: image/jpeg');
imagejpeg($dst,'',100);
ob_end_clean();
echo microtime(true) - $start;

php生成  曲线图 程序

<?php
/*******************用法*************************
    $gg=new build_graph();
   
    $d1=array(0,62,25,20,20,100,99);  //曲线一
//$d1=array('15'=>5,'16'=>8,'17'=>7,'18'=>9,'19'=>10,'20'=>15,'21'=>9); 改成这个形式啦
    $d2=array(0,80,75,65,100,56,79);  //曲线二
    $d3=array(0,60,50,25,12,56,45);   //曲线三 一下可以继续以此类推
   
    $gg->add_data($d1);
    $gg->add_data($d2);
    $gg->add_data($d3);
   
    $gg->set_colors("ee00ff,dd8800,00ff00"); //对应曲线的颜色
   
    //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
   
///////////////////////////////////////////////////////////
    //自定义图形显示，可任意图形叠加显示
       header("Content-type: image/png");
       $gg->create_cloths();          //画布
       $gg->create_frame();          //画个框先
       //$gg->build_rectangle(2);       //画矩形
       $gg->create_line();             //画线
       $gg->build_line(0);             //画曲线
       imagepng($gg->image);
       imagedestroy($gg->image);
*/
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 $array_color;                //曲线着色（存储十六进制数）
    var $image;                      //我们的图像
    //方法：接受用户数据
    function add_data($array_user_data)
    {
       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();
       }
      
       $i=count($this->array_data);
      
       $this->array_data[$i]=$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);
    }
    //---------------------------------------------------------------
    //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(){
       $this->width_num=count($this->array_data[0]);
    }
   
    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);
       }
      
       $this->height_max=max($tmpvar);
      
       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/$this->width_num);
    }
    function set_colors($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 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;
       }
      
        //画线
        
       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);
         
            $i=0;
              foreach($this->array_data[$j] as $keys=>$values)
            {
                $height_next_pix[]=round($this->array_data[$j][$keys]/$this->height_max*$this->graphheight);
            }
           
            foreach($this->array_data[$j] as $key=>$value)
            {
                $height_pix=round(($this->array_data[$j][$key]/$this->height_max)*$this->graphheight);
               
                if($i!=count($this->array_data[$j])-1)
                {
                    imageline($this->image,$this->width_var*$i,$this->graphheight-$height_pix,$this->width_var*($i+1),$this->graphheight-$height_next_pix[$i+1],$colorBlue);
                }
               
                $i++;
            }
        
        //print_r($height_next_pix);
        // exit;
         /*
          for($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*$i,$this->graphheight-$height_pix,$this->width_var*($i+1),$this->graphheight-$height_next_pix,$colorBlue);
          }*/
       }
      
      
       //画点
      
       $colorRed=imagecolorallocate($this->image, $this->colorRed[0], $this->colorRed[1], $this->colorRed[2]);
       for($j=0;$j<count($this->array_data);$j++)
       {
               $i=0;
            foreach($this->array_data[$j] as $key=>$value)
            {
                 $height_pix=round(($this->array_data[$j][$key]/$this->height_max)*$this->graphheight);
                 imagearc($this->image,$this->width_var*$i,$this->graphheight-$height_pix,6,5,0,360,$colorRed);
                 imagefilltoborder($this->image,$this->width_var*$i,$this->graphheight-$height_pix,$colorRed,$colorRed);
                 $i++;
            }
       
        /*
          for($i=0;$i<$this->width_num;$i++)
          {
             $height_pix=round(($this->array_data[$j][$i]/$this->height_max)*$this->graphheight);
             imagearc($this->image,$this->width_var*$i,$this->graphheight-$height_pix,6,5,0,360,$colorRed);
             imagefilltoborder($this->image,$this->width_var*$i,$this->graphheight-$height_pix,$colorRed,$colorRed);
          }
         */
       }
      
    }
######################################################################################################
    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]);
      
       for($i=1;$i<=$this->height_num;$i++)
       {
          //画横线
          $y1=($this->graphheight-($this->height_var/$this->height_max*$this->graphheight)*$i);
         
          $y2=($this->graphheight-($this->height_var/$this->height_max*$this->graphheight)*$i);
         
          imageline($this->image,0,$y1,$this->graphwidth,$y2,$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,$colorRed);
       }
      
       unset($i);
      
       foreach($this->array_data[0] as $key=>$value)
       {
              //画竖线
              imageline($this->image,$this->width_var*$i,0,$this->width_var*$i,$this->graphwidth,$colorGrey);
         
          //标出数字
           imagestring($this->image,2,$this->width_var*$i,$this->graphheight-15,$key,$colorRed);
          
           $i++;
       }
      
       /*
       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,$colorGrey);
          //标出数字
          imagestring($this->image,2,$this->width_var*$i,$this->graphheight-15,$i,$colorRed);
       }
       */
    }
    function build($graph,$str_var){
       //$graph是用户指定的图形种类,$str_var是生成哪个数据的图
       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
             $this->create_line();                   //打上底格线
             break;
       }
       //输出图形并清除内存
       imagepng($this->image);
       imagedestroy($this->image);
    }
}
?>

function Thumb_IM($thumbwidth, $thumbheight, $preview = 0) {
  global $thumbstatus, $imageimpath, $thumbquality;
  if($thumbstatus) {
   list($img_w, $img_h) = $this->attachinfo;
   $targetfile = !$preview ? ($thumbstatus == 1 || $thumbstatus == 3 ? $this->targetfile.'.thumb.jpg' : $this->targetfile) : DISCUZ_ROOT.'./forumdata/watermark_temp.jpg';
   if(!$this->animatedgif && ($img_w >= $thumbwidth || $img_h >= $thumbheight)) {
    if($thumbstatus != 3) {
     $exec_str = $imageimpath.'/convert -quality '.intval($thumbquality).' -geometry '.$thumbwidth.'x'.$thumbheight.' '.$this->targetfile.' '.$targetfile;
     @exec($exec_str, $output, $return);
     if(empty($return) && empty($output)) {
      $this->attach['thumb'] = $thumbstatus == 1 ? 1 : 0;
     }
    } else {
     $imgratio = $img_w / $img_h;
     $thumbratio = $thumbwidth / $thumbheight;
     if($imgratio >= 1 && $imgratio >= $thumbratio || $imgratio < 1 && $imgratio > $thumbratio) {
      $cuty = $img_h;
      $cutx = $cuty * $thumbratio;
     } elseif($imgratio >= 1 && $imgratio <= $thumbratio || $imgratio < 1 && $imgratio < $thumbratio) {
      $cutx = $img_w;
      $cuty = $cutx / $thumbratio;
     }
     $exec_str = $imageimpath.'/convert -crop '.$cutx.'x'.$cuty.'+0+0  '.$this->targetfile.' '.$targetfile;
     @exec($exec_str, $output, $return);
     $exec_str = $imageimpath.'/convert -quality '.intval($thumbquality).' -geometry '.$thumbwidth.'x'.$thumbheight.' '.$targetfile.' '.$targetfile;
     @exec($exec_str, $output, $return);
     if(empty($return) && empty($output)) {
      $this->attach['thumb'] = $thumbstatus == 1 || $thumbstatus == 3 ? 1 : 0;
     }
    }
             }
  }
 }
function Watermark_IM($preview = 0) {
  global $watermarkstatus, $watermarktype, $watermarktrans, $watermarkquality, $watermarktext, $imageimpath;
  $watermarkstatus = $GLOBALS['forum']['disablewatermark'] ? 0 : $watermarkstatus;
  switch($watermarkstatus) {
   case 1:
    $gravity = 'NorthWest';
    break;
   case 2:
    $gravity = 'North';
    break;
   case 3:
    $gravity = 'NorthEast';
    break;
   case 4:
    $gravity = 'West';
    break;
   case 5:
    $gravity = 'Center';
    break;
   case 6:
    $gravity = 'East';
    break;
   case 7:
    $gravity = 'SouthWest';
    break;
   case 8:
    $gravity = 'South';
    break;
   case 9:
    $gravity = 'SouthEast';
    break;
  }
  $targetfile = !$preview ? $this->targetfile : DISCUZ_ROOT.'./forumdata/watermark_temp.jpg';
  if($watermarktype < 2) {
   $watermark_file = $watermarktype == 1 ? DISCUZ_ROOT.'./images/common/watermark.png' : DISCUZ_ROOT.'./images/common/watermark.gif';
   $exec_str = $imageimpath.'/composite'.
    ($watermarktype != 1 && $watermarktrans != '100' ? ' -watermark '.$watermarktrans.'%' : '').
    ' -quality '.$watermarkquality.
    ' -gravity '.$gravity.
    ' '.$watermark_file.' '.$this->targetfile.' '.$targetfile;
  } else {
   $watermarktextcvt = str_replace(array("n", "r", "'"), array('', '', '''), pack("H*", $watermarktext['text']));
   $watermarktext['angle'] = -$watermarktext['angle'];
   $translate = $watermarktext['translatex'] || $watermarktext['translatey'] ? ' translate '.$watermarktext['translatex'].','.$watermarktext['translatey'] : '';
   $skewX = $watermarktext['skewx'] ? ' skewX '.$watermarktext['skewx'] : '';
   $skewY = $watermarktext['skewy'] ? ' skewY '.$watermarktext['skewy'] : '';
   $exec_str = $imageimpath.'/convert'.
    ' -quality '.$watermarkquality.
    ' -font "'.$watermarktext['fontpath'].'"'.
    ' -pointsize '.$watermarktext['size'].
    (($watermarktext['shadowx'] || $watermarktext['shadowy']) && $watermarktext['shadowcolor'] ?
     ' -fill "rgb('.$watermarktext['shadowcolor'].')"'.
     ' -draw "'.
      ' gravity '.$gravity.$translate.$skewX.$skewY.
      ' rotate '.$watermarktext['angle'].
      ' text '.$watermarktext['shadowx'].','.$watermarktext['shadowy'].' ''.$watermarktextcvt.''"' : '').
    ' -fill "rgb('.$watermarktext['color'].')"'.
    ' -draw "'.
     ' gravity '.$gravity.$translate.$skewX.$skewY.
     ' rotate '.$watermarktext['angle'].
     ' text 0,0 ''.$watermarktextcvt.''"'.
    ' '.$this->targetfile.' '.$targetfile;
  }
  @exec($exec_str, $output, $return);
  if(empty($return) && empty($output)) {
   $this->attach['size'] = filesize($this->targetfile);
  }
 }