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  1. <?php
  2. namespace PreviewGenerator;
  3.  
  4. use WideImage\WideImage;
  5. use WideImage\Image;
  6.  
  7. /*
  8. 	$pg = new PreviewGenerator;
  9. 	$image = WideImage::load('image.jpg');
  10. 	$wm = WideImage::load('logo.png');
  11. 	$pg->putWatermark($image, $wm)->saveToFile('image.jpg');
  12.  
  13. 	$pg->create($image, 240, 180)->saveToFile('preview.jpg');
  14. */
  15.  
  16. class PreviewGenerator
  17. {
  18.     const PREVIEW_WIDTH = 160;
  19.     const PREVIEW_HEIGHT = 120;
  20.     const BG_RED = 255;
  21.     const BG_GREEN = 255;
  22.     const BG_BLUE = 255;
  23.     const WM_RATIO = 0.2;
  24.  
  25.     private $previewWidth;
  26.     private $previewHeight;
  27.     private $image;
  28.  
  29.     public function create(
  30.         Image $image,
  31.         $width = self::PREVIEW_WIDTH,
  32.         $height = self::PREVIEW_HEIGHT,
  33.         $red = self::BG_RED,
  34.         $green = self::BG_GREEN,
  35.         $blue = self::BG_BLUE
  36.     ) {
  37.         $this->previewWidth = $width;
  38.         $this->previewHeight = $height;
  39.         $this->image = $image;
  40.  
  41.         $bg = WideImage::createPaletteImage($width, $height);
  42.         $bgColor = $bg->allocateColor($red, $green, $blue);
  43.         $bg->fill(0, 0, $bgColor);
  44.  
  45.         if ($this->tooSmall()) {
  46.             $preview = $bg->merge($this->image);
  47.         } elseif ($this->isWide()) {
  48.             $resized = $this->image->resizeDown($this->previewWidth);
  49.             $preview = $this->bg->merge(
  50.                 $resized, 0, $this->getTopOffset($resized)
  51.             );
  52.         } else {
  53.             $resized = $this->image->resizeDown(null, $this->previewHeight);
  54.             $preview = $bg->merge(
  55.                 $resized, $this->getLeftOffset($resized), 0
  56.             );
  57.         }
  58.         return $preview;
  59.     }
  60.  
  61.     public function putWatermark(
  62.         Image $image,
  63.         Image $wm,
  64.         $opacity = 100,
  65.         $wmRatio = self::WM_RATIO,
  66.         $margin = 10
  67.     ) {
  68.         $desiredWidth = intval($this->getSmallerSide() * $wmRatio);
  69.         $wmResized = $wm->resizeDown($desiredWidth);
  70.         return $image->merge(
  71.             $wmResized,
  72.             $this->image->getWidth() - $wmResized->getWidth() - $margin,
  73.             $this->image->getHeight() - $wmResized->getHeight() - $margin,
  74.             $opacity
  75.         );
  76.     }
  77.  
  78.     private function isWide()
  79.     {
  80.         return $this->imageRatio() >= $this->previewRatio();
  81.     }
  82.  
  83.     private function imageRatio()
  84.     {
  85.         return $this->image->getWidth()
  86.             / $this->image->getHeight();
  87.     }
  88.  
  89.     private function previewRatio()
  90.     {
  91.         return $this->previewWidth / $this->previewHeight;
  92.     }
  93.  
  94.     private function tooSmall()
  95.     {
  96.         return ($this->image->getWidth() <= $this->previewWidth)
  97.         and ($this->image->getHeight() <= $this->previewHeight);
  98.     }
  99.  
  100.     private function getSmallerSide()
  101.     {
  102.         if ($this->image->getWidth() < $this->image->getHeight()) {
  103.             return $this->image->getWidth();
  104.         } else {
  105.             return $this->image->getHeight();
  106.         }
  107.     }
  108.  
  109.     private function getTopOffset($resized)
  110.     {
  111.         return intval(
  112.             ($this->previewHeight - $resized->getHeight()) / 2
  113.         );
  114.     }
  115.  
  116.     private function getLeftOffset($resized)
  117.     {
  118.         return intval(
  119.             ($this->previewWidth - $resized->getWidth()) / 2
  120.         );
  121.     }
  122. }
  123.  
Success #stdin #stdout 0.02s 52472KB
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https://ideone.com/wNwIh1
language:
PHP (php 7.3.5)
created:
8 years ago
visibility:
public

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