Finish resize

Author: zzfly256

ImageResize.php

@@ -0,0 +1,110 @@
+<?php
+class ImageResize
+{
+    private $path;
+    private $filename;
+    private $extension;
+    private $width;
+    private $height;
+
+    private $rawResource;
+    private $newResource;
+
+    public function __construct($path, $width = 170, $height = 128, $sourceFormat = null)
+    {
+
+        // File and new size
+        $this->path = $path;
+        $this->width = $width;
+        $this->height = $height;
+
+        if (is_null($sourceFormat)) {
+            list($this->filename,$this->extension) = explode(".",$path);
+        } else {
+            $this->extension = $sourceFormat;
+        }
+
+        if(!in_array($this->extension,['png', 'jpg', 'gif'])){
+            trigger_error('no supported format.');
+        }
+
+        $this->generate();
+    }
+
+    private function generate(){
+        // Get new sizes
+        list($oldWidth, $oldHeight) = getimagesize($this->path);
+
+        $condition = $oldWidth / $oldHeight;
+        $resizeWidthPercent = $this->width / $oldWidth;
+        $resizeHeightPercent = $this->height / $oldHeight;
+
+        $offsetHeight = 0;
+        $offsetWidth = 0;
+
+        if ($condition  < ($this->width / $this->height)){
+            $offsetHeight = ( $resizeWidthPercent * $oldHeight - $this->height ) * 0.5 / ($resizeWidthPercent);
+        } else {
+            $offsetWidth = ( $resizeHeightPercent * $oldWidth - $this->width ) * 0.5 / ($resizeHeightPercent);
+        }
+
+        // Load
+        $this->newResource = imagecreatetruecolor($this->width, $this->height);
+
+
+        switch ($this->extension){
+            case 'jpg' : $this->rawResource = imagecreatefromjpeg($this->path); break;
+            case 'png' : $this->rawResource = imagecreatefrompng($this->path); break;
+            case 'gif' : $this->rawResource = imagecreatefromgif($this->path); break;
+        }
+
+        // Resize
+        imagecopyresized($this->newResource, $this->rawResource, 0, 0, $offsetWidth, $offsetHeight, $this->width, $this->height, $oldWidth - 2 * $offsetWidth, $oldHeight - 2 * $offsetHeight);
+
+    }
+
+    public function save($path, $format = null){
+
+        if (is_null($format)) {
+            list($filename,$extension) = explode(".",$path);
+        } else {
+            $extension = $format;
+        }
+
+        if(!in_array($extension,['png', 'jpg', 'gif'])){
+            trigger_error('no supported format.');
+        }
+        switch ($extension){
+            case 'jpg' :
+                imagejpeg($this->newResource, $path);
+                break;
+            case 'png' :
+                imagepng($this->newResource, $path);
+                break;
+            case 'gif' :
+                imagegif($this->newResource, $path);
+                break;
+        }
+
+    }
+
+    public function render(){
+        switch ($this->extension){
+            case 'jpg' :
+                header('Content-Type: image/jpeg');
+                imagejpeg($this->newResource);
+                break;
+            case 'png' :
+                header('Content-Type: image/png');
+                imagepng($this->newResource);
+                break;
+            case 'gif' :
+                header('Content-Type: image/gif');
+                imagegif($this->newResource);
+                break;
+        }
+    }
+}
+
+$a = new ImageResize('test.jpg',170,128);
+$a->save('a.png');