添加图片裁切成小块的功能

src/Library/Pixes.php

@@ -0,0 +1,147 @@
+<?php
+/**
+ * 图片裁切，将大图，切成小图
+ * 用法：
+ * $pixes = new \Qii\Library\Pixes();
+ * $pixes->maxWidth = 200;
+ * $pixes->maxHeight = 100;
+ * $pixes->cutPixes($fileName, $dir);
+ */
+namespace Qii\Library;
+
+class Pixes
+{
+    /**
+     * @var int $maxWidth 图片的最大宽度
+     */
+    public $maxWidth = 800;
+    /**
+     * @var int $maxHeight 图片的最大高度
+     */
+    public $maxHeight = 600;
+    
+    
+    public function __construct()
+    {
+        return $this;
+    }
+    
+    /**
+     * 获取文件的相关信息
+     * @param string $src 图片链接
+     * @return array
+     * @throws Exception
+     */
+    public function getImageSize($src)
+    {
+        $size = @getimagesize($src);
+        if(!$size)
+        {
+            throw new Exception('未知图片', __LINE__);
+        }
+        return ['width' => $size[0], 'height' => $size[1], 'type' => $size[2], 'mime' => $size['mime'], 'bits' => $size['bits']];
+    }
+    
+    /**
+     * 计算图片需要切成的块数及相应的坐标
+     *
+     * @param string $src 图片地址
+     * @return array
+     */
+    public function getPixes($src)
+    {
+        $imageInfo = $this->getImageSize($src);
+        //横向
+        $horizontal = [];
+        //纵向
+        $vertical = [];
+        
+        $horizontalCount = ceil($imageInfo['width'] / $this->maxWidth);
+        $verticalCount = ceil($imageInfo['height'] / $this->maxHeight);
+        
+        for($i = 0; $i < $horizontalCount; $i++)
+        {
+            $x = $i * $this->maxWidth;
+            $width = ($x + $this->maxWidth > $imageInfo['width'] ? $imageInfo['width'] - $x : $this->maxWidth) - 1;
+            $horizontal[] = [$x, $width];
+        }
+        for($i = 0; $i < $verticalCount; $i++)
+        {
+            $y = $i * $this->maxHeight;
+            $height = ($y + $this->maxHeight > $imageInfo['height'] ? $imageInfo['height'] - $y : $this->maxHeight) - 1;
+            $vertical[] = [$y, $height];
+        }
+        
+        $pixes = ['info' => $imageInfo, 'horizontal' => $horizontal, 'vertical' => $vertical];
+        $pix = [];
+        
+        for($i = 0 ; $i < $verticalCount; $i++)
+        {
+            for($j = 0; $j < $horizontalCount; $j++)
+            {
+                //x, y, width, height
+                $pix[$i .'-'. $j] = [$horizontal[$j][0], $vertical[$i][0], $horizontal[$j][1], $vertical[$i][1]];
+            }
+        }
+        
+        $pixes['horizontalCount'] = (int) $horizontalCount;
+        $pixes['verticalCount'] = (int) $verticalCount;
+        $pixes['pixes'] = $pix;
+        return $pixes;
+    }
+    
+    /**
+     * 裁切图片
+     * @param string $src 图片地址
+     * @param string $dir 保存裁切后的图片路径
+     * @return array
+     * @throws Exception
+     */
+    public function cutPixes($src, $dir = '')
+    {
+        $pixes = $this->getPixes($src);
+        switch ($pixes['info']['type']) {//判断图像类型
+            case 1:
+                $image = imagecreatefromgif($src);
+                break;
+            case 2:
+                $image = imagecreatefromjpeg($src);
+                break;
+            case 3:
+                $image = imagecreatefrompng($src);
+                $color = imagecolorallocate($image, 255, 255, 255);
+                imagecolortransparent($image, $color);
+                imagefill($image, 0, 0, $color);
+                break;
+            default:
+                $image = imagecreatefromjpeg($src);
+                break;
+        }
+        foreach($pixes['pixes'] as $name => $pix)
+        {
+            $name = ($dir ? $dir .'/': '') . $name;
+            $pixes['info']['ext'] = 'jpeg';
+            switch ($pixes['info']['type'])
+            {
+                case 3:
+                    $pixes['info']['ext'] = 'png';
+                    $small = imagecreatetruecolor($pix[2], $pix[3]);
+                    imagecopy($small, $image, 0, 0, $pix[0], $pix[1], $pix[2], $pix[3]);
+                    imagejpeg($small, $name . '.png', 100);
+                    break;
+                default:
+                    $small = imagecreate($pix[2], $pix[3]);
+                    imagecopy($small, $image, 0, 0, $pix[0], $pix[1], $pix[2], $pix[3]);
+                    imagejpeg($small, $name . '.jpeg', 100);
+                    break;
+            }
+            imagedestroy($small);
+        }
+        $log = ($dir ? $dir .'/': '') . 'cut-info.php';
+        if(!file_put_contents($log, "<?php\nreturn ". var_export($pixes, true) . ";\n"))
+        {
+            throw new Exception($log . '写入失败，请确保目录的权限是否设置正确');
+        }
+        return $pixes;
+    }
+}