PHP圖像操作：3D圖、縮放、旋轉、裁剪、添加水印（三）

PHP圖像操作：3D圖、縮放、旋轉、裁剪、添加水印（三）

來源：http://www.ido321.com/887.html

5、PHP對圖像的旋轉

   1: 

   2:     
旋轉之前

   3:     

   4: 

   5: 
   6: header("content-type","text/html;charset=utf-8");
   7:  
   8: /*
   9: *圖片沿y軸旋轉,以png格式為例
  10: *@param string $filename 圖片的url
  11: */
  12: function turn_y($filename)
  13: {
  14:     /*創建圖片資源*/
  15:     $backy = imagecreatefrompng($filename);
  16:  
  17:     /*獲取大小*/
  18:     $widthy = imagesx($backy);
  19:     $heighty = imagesy($backy);
  20:  
  21:     /*創建新的圖片資源，保存翻轉後的圖片*/
  22:     $newy = imagecreatetruecolor($widthy, $heighty);
  23:  
  24:     /*沿著y軸翻轉，就是將原圖從右向左按一個像素寬度向新資源中逐個復制*/
  25:     for ($i=0; $i < $widthy; $i++) { 
  26:         imagecopy($newy,$backy,$widthy-$i-1,0,$i,0,1,$heighty);
  27:     }
  28:  
  29:     /*保存翻轉後的圖片*/
  30:     imagepng($newy,'https://www.aspphp.online/bianchen/UploadFiles_4619/201701/2017011709565162.png');
  31:  
  32:     /*釋放資源*/
  33:     imagedestroy($backy);
  34:     imagedestroy($newy);
  35: }
  36:  
  37: /*
  38: *圖片沿x軸旋轉,以png格式為例
  39: *@param string $filename 圖片的url
  40: */
  41: function turn_x($filename)
  42: {
  43:     /*創建圖片資源*/
  44:     $backx = imagecreatefrompng($filename);
  45:  
  46:     /*獲取大小*/
  47:     $widthx = imagesx($backx);
  48:     $heightx = imagesy($backx);
  49:  
  50:     /*創建新的圖片資源，保存翻轉後的圖片*/
  51:     $newx = imagecreatetruecolor($widthx, $heightx);
  52:  
  53:     /*沿著x軸翻轉，就是將原圖從上到下按一個像素寬度向新資源中逐個復制*/
  54:     for ($i=0; $i < $heightx; $i++) { 
  55:         imagecopy($newx,$backx,0,$heightx-$i-1,0,$i,$widthx,1);
  56:     }
  57:  
  58:     /*保存翻轉後的圖片*/
  59:     imagepng($newx,'https://www.aspphp.online/bianchen/UploadFiles_4619/201701/2017011709565155.png');
  60:  
  61:     /*釋放資源*/
  62:     imagedestroy($backx);
  63:     imagedestroy($newx);
  64: }
  65: /*調用函數*/
  66: turn_y('https://www.aspphp.online/bianchen/UploadFiles_4619/201701/2017011709565169.png');
  67: turn_x('https://www.aspphp.online/bianchen/UploadFiles_4619/201701/2017011709565169.png');
  68: ?>
  69: 
  70:     
沿著y軸旋轉
  71:     
  72: 
  73: 
  74:     
沿著x軸旋轉
  75:     
  76: 


效果