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标题: PHP图片等比缩放类SimpleImage使用方法和使用实例分享 [打印本页]

作者: wx_pylelnL4 时间: 2018-2-14 05:59

         使用方法示例：
设定宽度，等比例缩放
[U]复制代码[/U] 代码如下:
load('picture.jpg');
$image->resizeToWidth(250);
$image->save('picture2.jpg');?>
设定高度，等比例缩放
[U]复制代码[/U] 代码如下:
load('picture.jpg');
$image->resizeToHeight(500);
$image->save('picture2.jpg');
$image->resizeToHeight(200);
$image->save('picture3.jpg');?>
按比例，缩放至50%
[U]复制代码[/U] 代码如下:
load('picture.jpg');
$image->scale(50);
$image->save('picture2.jpg');?>
缩放后直接输出到屏幕
[U]复制代码[/U] 代码如下:
load('picture.jpg');
$image->resizeToWidth(150);
$image->output();?>
使用例子：
[U]复制代码[/U] 代码如下:
$url="http://f3.v.ve";
$picfile = down($url);//下载图片（下载图片的路径可以处理完成后清空，这里未进行处理）
$res = new SimpleImage();//图片处理实例
$res = $res->load($picfile);
$tmpfile = tempfile().'.jpg';//创建一个路径文件用来保存图片
$width = '30';//设定图片的宽度
$res->resizeToWidth($width);
$res->save($tmpfile);//把处理后的图片保存（无.jpg后缀）
//这里总共产生了3个文件，一个是下载的图片文件，一个是临时文件，最后一个是处理的图片文件。需要优化清理掉前两个文件。

function down($url)
{
      $http = array();
      $header = "http://f3.v.ve";
      if ($header) {
         $http['header'] = $header;
      }
      $http['timeout'] = 50;
      $ctx = stream_context_create(array(
         'http' => $http,
      ));
      $content = @file_get_contents($url, 0, $ctx);
      sleep(1);
      if (!$content) {
         return false;
      }
      $tmpfile = tempfile();
      file_put_contents($tmpfile, $content);
      return $tmpfile;
}
function tempfile()
{
      $path = dirname(__FILE__);
      $path .= '/spider/' . date('Ymd') . '/'.date('His').'-' . (int)(time() / 300);
      if (!file_exists($path)) {
         mkdir($path, 0777, true);
      }
      do {
         $file = $path . '/' . dechex(mt_rand());
      }
      while (file_exists($file));
      touch($file);
      return $file;
}
图片处理类源码（官网地址：http://www.white-hat-web-design.co.uk/blog/resizing-images-with-php/）：
[U]复制代码[/U] 代码如下:
image_type = $image_info[2];
      if( $this->image_type == IMAGETYPE_JPEG ) {
         $this->image = @imagecreatefromjpeg($filename);
      } elseif( $this->image_type == IMAGETYPE_GIF ) {
         $this->image = @imagecreatefromgif($filename);
      } elseif( $this->image_type == IMAGETYPE_PNG ) {
         $this->image = @imagecreatefrompng($filename);
      }
      if (!$this->image) {
         return false;
      }
      return $this;
}
function save($filename, $image_type=IMAGETYPE_JPEG, $compression=75, $permissions=null) {
      if( $image_type == IMAGETYPE_JPEG ) {
         imagejpeg($this->image,$filename,$compression);
      } elseif( $image_type == IMAGETYPE_GIF ) {
         imagegif($this->image,$filename);
      } elseif( $image_type == IMAGETYPE_PNG ) {
         imagepng($this->image,$filename);
      }
      if( $permissions != null) {
         chmod($filename,$permissions);
      }
}
function output($image_type=IMAGETYPE_JPEG) {
      if( $image_type == IMAGETYPE_JPEG ) {
         imagejpeg($this->image);
      } elseif( $image_type == IMAGETYPE_GIF ) {
         imagegif($this->image);
      } elseif( $image_type == IMAGETYPE_PNG ) {
         imagepng($this->image);
      }
}
function getWidth() {
      return imagesx($this->image);
}
function getHeight() {
      return imagesy($this->image);
}
function resizeToHeight($height) {
      $ratio = $height / $this->getHeight();
      $width = $this->getWidth() * $ratio;
      $this->resize($width,$height);
}
function resizeToWidth($width) {
      if ($this->getWidth() getWidth();
      }
      $ratio = $width / $this->getWidth();
      $height = $this->getheight() * $ratio;
      $this->resize($width,$height);
}
function scale($scale) {
      $width = $this->getWidth() * $scale/100;
      $height = $this->getheight() * $scale/100;
      $this->resize($width,$height);
}
function resize($width,$height) {
      $new_image = imagecreatetruecolor($width, $height);
      imagecopyresampled($new_image, $this->image, 0, 0, 0, 0, $width, $height, $this->getWidth(), $this->getHeight());
      $this->image = $new_image;
}

function resize2($width,$height) {
      $new_image = imagecreatetruecolor($width, $height);
      if( $this->image_type == IMAGETYPE_GIF || $this->image_type == IMAGETYPE_PNG ) {
         $current_transparent = imagecolortransparent($this->image);
         if($current_transparent != -1) {
            $transparent_color = imagecolorsforindex($this->image, $current_transparent);
            $current_transparent = imagecolorallocate($new_image, $transparent_color['red'], $transparent_color['green'], $transparent_color['blue']);
            imagefill($new_image, 0, 0, $current_transparent);
            imagecolortransparent($new_image, $current_transparent);
         } elseif( $this->image_type == IMAGETYPE_PNG) {
            imagealphablending($new_image, false);
            $color = imagecolorallocatealpha($new_image, 0, 0, 0, 127);
            imagefill($new_image, 0, 0, $color);
            imagesavealpha($new_image, true);
         }
      }
      imagecopyresampled($new_image, $this->image, 0, 0, 0, 0, $width, $height, $this->getWidth(), $this->getHeight());
      $this->image = $new_image;
}
}


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