Code Example of Picture Proportional Cutting in ThinkPHP

In the development, it is often encountered that pictures need to be scaled according to a certain ratio of 1. However, if a picture with an aspect ratio of 2: 1 needs to be displayed according to a ratio of 1: 1, it means that the picture will be deformed. Here's how to cut and scale pictures in downloading tp framework.

  /**
   *  Cut a picture 
   * @param $path  The path of the picture to be cut 
   * @param $prefix  Prefix the cut picture 
   * @param $width  Proportion of width 
   * @param $height  Proportion of height 
   * @return string  Picture name 
   */
function sizeThumb($path,$prefix,$width,$height){
  import("ORG.Util.Image.ThinkImage");
  $image=new ThinkImage();
  $image->open('.'.$path);// Open thumbnails for editing 
  $imageWidth=$image->width();// Get picture size 
  $imageHeight=$image->height();
  $save_name=getThumb($path, $prefix);
  if (($imageHeight/$height*$width)>$imageWidth) {// Cut according to height, if the width is not that long, cut according to width 
    $image->thumb($imageWidth, ($imageWidth/$width*$height),THINKIMAGE_THUMB_CENTER)->save('.'.$save_name);
  }else{
    $image->thumb(($imageHeight/$height*$width), $imageHeight,THINKIMAGE_THUMB_CENTER)->save('.'.$save_name);
  }
  return $save_name;
}

Here, we use the method of taking the largest scale picture from the middle. If you need to use other methods, such as intercepting from the left, modify it. THINKIMAGE_THUMB_CENTER 'Yes, it is not necessary for the server to take such a way. After all, the front end can also handle it, which should be considered according to the actual situation.

Of course, all images are stored in the relative position of images. If thumbnails are generated, we don't need to use another field to save our thumbnails. We just need to rewrite the cutting and splicing string.

  /**
   *  Get the picture path 
   * @param $prefix  Prefix of picture 
   * @param $img_url  Path of the original image 
   * @return string  Picture path 
   */
function getThumb($img_url,$prefix){
  $str_arr=explode('/', $img_url);
  $last=count($str_arr);
  $str_arr[$last-1]=$prefix.$str_arr[$last-1];
  $str=implode('/', $str_arr);
  return $str;
}

Summarize