PHP全功能无变形图片裁剪操作类与用法示例
发布时间:2021-01-11 18:45:51  所属栏目:PHP  来源:互联网 
            导读:这篇文章主要介绍了PHP全功能无变形图片裁剪操作类与用法,结合实例形式分析了php操作图片的裁剪、缩放等相关技巧,需要的朋友可以参考下
                
                
                
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                         本文实例讲述了PHP全功能无变形图片裁剪操作类与用法。分享给大家供大家参考,具体如下: 如果需要图片裁剪,或生成缩略图,这个基本上没有问题,全部需要的功能都在里面,全部都是无变形的。 这里我们划分为四种模式: 
 代码如下(此处代码通过本站在线工具做了格式化处理): Crop(120,80,2);
* $ic->SaveImage();
*    //$ic->SaveAlpha();将补白变成透明像素保存
* $ic->destory();
*
*
*/
class ImageCrop {
  var $sImage;
  var $dImage;
  var $src_file;
  var $dst_file;
  var $src_width;
  var $src_height;
  var $src_ext;
  var $src_type;
  function ImageCrop($src_file,$dst_file='') {
    $this->src_file=$src_file;
    $this->dst_file=$dst_file;
    $this->LoadImage();
  }
  function SetSrcFile($src_file) {
    $this->src_file=$src_file;
  }
  function SetDstFile($dst_file) {
    $this->dst_file=$dst_file;
  }
  function LoadImage() {
    list($this->src_width,$this->src_height,$this->src_type) = getimagesize($this->src_file);
    switch($this->src_type) {
      case IMAGETYPE_JPEG :
      $this->sImage=imagecreatefromjpeg($this->src_file);
      $this->ext='jpg';
      break;
      case IMAGETYPE_PNG :
      $this->sImage=imagecreatefrompng($this->src_file);
      $this->ext='png';
      break;
      case IMAGETYPE_GIF :
      $this->sImage=imagecreatefromgif($this->src_file);
      $this->ext='gif';
      break;
      default:
      exit();
    }
  }
  function SaveImage($fileName='') {
    $this->dst_file=$fileName ? $fileName : $this->dst_file;
    switch($this->src_type) {
      case IMAGETYPE_JPEG :
      imagejpeg($this->dImage,$this->dst_file,100);
      break;
      case IMAGETYPE_PNG :
      imagepng($this->dImage,$this->dst_file);
      break;
      case IMAGETYPE_GIF :
      imagegif($this->dImage,$this->dst_file);
      break;
      default:
      break;
    }
  }
  function OutImage() {
    switch($this->src_type) {
      case IMAGETYPE_JPEG :
      header('Content-type: image/jpeg');
      imagejpeg($this->dImage);
      break;
      case IMAGETYPE_PNG :
      header('Content-type: image/png');
      imagepng($this->dImage);
      break;
      case IMAGETYPE_GIF :
      header('Content-type: image/gif');
      imagegif($this->dImage);
      break;
      default:
      break;
    }
  }
  function SaveAlpha($fileName='') {
    $this->dst_file=$fileName ? $fileName . '.png' : $this->dst_file .'.png';
    imagesavealpha($this->dImage,true);
    imagepng($this->dImage,$this->dst_file);
  }
  function OutAlpha() {
    imagesavealpha($this->dImage,true);
    header('Content-type: image/png');
    imagepng($this->dImage);
  }
  function destory() {
    imagedestroy($this->sImage);
    imagedestroy($this->dImage);
  }
  function Crop($dst_width,$dst_height,$mode=1,$dst_file='') {
    if($dst_file) $this->dst_file=$dst_file;
    $this->dImage = imagecreatetruecolor($dst_width,$dst_height);
    $bg = imagecolorallocatealpha($this->dImage,255,127);
    imagefill($this->dImage,$bg);
    imagecolortransparent($this->dImage,$bg);
    $ratio_w=1.0 * $dst_width / $this->src_width;
    $ratio_h=1.0 * $dst_height / $this->src_height;
    $ratio=1.0;
    switch($mode) {
      case 1:    // always crop
      if( ($ratio_w < 1 && $ratio_h < 1) || ($ratio_w > 1 && $ratio_h > 1)) {
        $ratio = $ratio_w < $ratio_h ? $ratio_h : $ratio_w;
        $tmp_w = (int)($dst_width / $ratio);
        $tmp_h = (int)($dst_height / $ratio);
        $tmp_img=imagecreatetruecolor($tmp_w,$tmp_h);
        $src_x = (int) (($this->src_width-$tmp_w)/2) ;
        $src_y = (int) (($this->src_height-$tmp_h)/2) ;
        imagecopy($tmp_img,$this->sImage,$src_x,$src_y,$tmp_w,$tmp_h);
        imagecopyresampled($this->dImage,$tmp_img,$dst_width,$tmp_h);
        imagedestroy($tmp_img);
      } else {
        $ratio = $ratio_w < $ratio_h ? $ratio_h : $ratio_w;
        $tmp_w = (int)($this->src_width * $ratio);
        $tmp_h = (int)($this->src_height * $ratio);
        $tmp_img=imagecreatetruecolor($tmp_w,$tmp_h);
        imagecopyresampled($tmp_img,$tmp_h,$this->src_width,$this->src_height);
        $src_x = (int)($tmp_w - $dst_width) / 2 ;
        $src_y = (int)($tmp_h - $dst_height) / 2 ;
        imagecopy($this->dImage,$dst_height);
        imagedestroy($tmp_img);
      }
      break;
      case 2:    // only small
      if($ratio_w < 1 && $ratio_h < 1) {
        $ratio = $ratio_w < $ratio_h ? $ratio_h : $ratio_w;
        $tmp_w = (int)($dst_width / $ratio);
        $tmp_h = (int)($dst_height / $ratio);
        $tmp_img=imagecreatetruecolor($tmp_w,$tmp_h);
        $src_x = (int) ($this->src_width-$tmp_w)/2 ;
        $src_y = (int) ($this->src_height-$tmp_h)/2 ;
        imagecopy($tmp_img,$tmp_h);
        imagedestroy($tmp_img);
      } elseif($ratio_w > 1 && $ratio_h > 1) {
        $dst_x = (int) abs($dst_width - $this->src_width) / 2 ;
        $dst_y = (int) abs($dst_height -$this->src_height) / 2;
        imagecopy($this->dImage,$dst_x,$dst_y,$this->src_height);
      } else {
        $src_x=0;
        $dst_x=0;
        $src_y=0;
        $dst_y=0;
        if(($dst_width - $this->src_width) < 0) {
          $src_x = (int) ($this->src_width - $dst_width)/2;
          $dst_x =0;
        } else {
          $src_x =0;
          $dst_x = (int) ($dst_width - $this->src_width)/2;
        }
        if( ($dst_height -$this->src_height) < 0) {
          $src_y = (int) ($this->src_height - $dst_height)/2;
          $dst_y = 0;
        } else {
          $src_y = 0;
          $dst_y = (int) ($dst_height - $this->src_height)/2;
        }
        imagecopy($this->dImage,$this->src_height);
      }
      break;
      case 3:    // keep all image size and create need size
      if($ratio_w > 1 && $ratio_h > 1) {
        $dst_x = (int)(abs($dst_width - $this->src_width )/2) ;
        $dst_y = (int)(abs($dst_height- $this->src_height)/2) ;
        imagecopy($this->dImage,$this->src_height);
      } else {
        $ratio = $ratio_w > $ratio_h ? $ratio_h : $ratio_w;
        $tmp_w = (int)($this->src_width * $ratio);
        $tmp_h = (int)($this->src_height * $ratio);
        $tmp_img=imagecreatetruecolor($tmp_w,$this->src_height);
        $dst_x = (int)(abs($tmp_w -$dst_width )/2) ;
        $dst_y = (int)(abs($tmp_h -$dst_height)/2) ;
        imagecopy($this->dImage,$tmp_h);
        imagedestroy($tmp_img);
      }
      break;
      case 4:    // keep all image but create actually size
      if($ratio_w > 1 && $ratio_h > 1) {
        $this->dImage = imagecreatetruecolor($this->src_width,$this->src_height);
        imagecopy($this->dImage,$this->src_height);
      } else {
        $ratio = $ratio_w > $ratio_h ? $ratio_h : $ratio_w;
        $tmp_w = (int)($this->src_width * $ratio);
        $tmp_h = (int)($this->src_height * $ratio);
        $this->dImage = imagecreatetruecolor($tmp_w,$this->src_height);
      }
      break;
    }
  }
  // end Crop
}
?>
 PS:这里再为大家推荐几款比较实用的图片处理工具供大家参考使用: 在线图片转换BASE64工具: ICO图标在线生成工具: 在线Email邮箱图标制作工具: 在线图片格式转换(jpg/bmp/gif/png)工具: 更多关于PHP相关内容感兴趣的读者可查看本站专题:《》、《》、《》、《》、《》、《》、《》、《》及《》 希望本文所述对大家PHP程序设计有所帮助。 (编辑:莱芜站长网) 【声明】本站内容均来自网络,其相关言论仅代表作者个人观点,不代表本站立场。若无意侵犯到您的权利,请及时与联系站长删除相关内容!  | 
                  
