<?php
/**
* 影像處理類
*
* @author Carmen <e.carmen.hyc@gmail.com>
*
*
* 生成驗證碼：Image::verify(長度， 寬， 高)
*
* 加蓋圖片水印：Image::water(圖片路徑, 水印圖路徑, 儲存路徑)
*
* 加蓋文字水印：Image::text(圖片路徑, 文字內容, 儲存路徑)
*
* 生成縮圖：Image::thumb(圖片路徑, 寬, 高, 儲存路徑)
*
* ps:儲存路徑引數均為留空則替換原圖
*
* 為了減少引數，部份配置項採用常量定義
* 嵌入框架時，找到每個方法的初始處把常量替換成配置檔案項
* 如 ThinkPHP 可採用 C() 函式代替常量定義
*/
/**********縮圖配置項**********/
//縮圖寬度
define('THUMB_WIDTH', 200);
//縮圖高度
define('THUMB_HEIGHT', 120);
Class Image {
/**
* 生成驗證碼
* @param [Integer] $length [驗證碼長度]
* @param [Integer] $width [驗證碼寬度]
* @param [Integer] $height [驗證碼高度]
* @return [boolean]
*/
Static Public function verify ($length = NULL, $width = NULL, $height = NULL) {
//環境檢測
if (!self::checkCondition()) return false;
//初始化引數(放進框架時把常量換成 讀取配置檔案項 )
$length = empty($length) ? C('VERIFY_LENGTH') : $length;
$width = empty($width) ? C('VERIFY_WIDTH') : $width;
$height= empty($height) ? C('VERIFY_HEIGHT') : $height;
$bgColor = C('VERIFY_BGCOLOR');
$seed = C('VERIFY_SEED');
$fontFile = C('VERIFY_FONTFILE');
$size = C('VERIFY_SIZE');
$fontColor = C('VERIFY_COLOR');
$name = C('VERIFY_NAME');
$fn = C('VERIFY_FUNC');
//建立畫布影像
$verify = imagecreatetruecolor($width, $height);
//畫布背景色
$rgb = self::colorTrans($bgColor);
$color = imagecolorallocate($verify, $rgb['red'], $rgb['green'], $rgb['blue']);
imagefill($verify, 0, 0, $color);
//寫入背景干擾字型
$len = strlen($seed) - 1;
for ($i = 0; $i < 20; $i++) {
$color = imagecolorallocate($verify, mt_rand(0, 255), mt_rand(0, 255), mt_rand(0, 255));
imagestring($verify, 5, mt_rand(0, $width), mt_rand(0, $height), $seed[mt_rand(0, $len)], $color);
}
$rgb = self::colorTrans($fontColor);
$fontColor = imagecolorallocate($verify, $rgb['red'], $rgb['green'], $rgb['blue']);
//寫入驗證碼
$code = '';
$left = ($width - $size * $length) / 2;
$y = $height - ($height - $size) / 2;
for ($i = 0; $i < $length; $i++) {
$font = $seed[mt_rand(0, $len)];
$x = $size * $i + $left;
imagettftext($verify, $size, mt_rand(-30, 30), $x, $y, $fontColor, $fontFile, $font);
$code .= $font;
}
$_SESSION[$name] = $fn($code);
//干擾線
for ($i = 0, $h = $height / 2 - 2; $i < 5; $i++, $h++) {
$color = imagecolorallocate($verify, mt_rand(0, 255), mt_rand(0, 255), mt_rand(0, 255));
$cx = mt_rand(-10, $width + 10);
$cy = mt_rand(-10, $height + 10);
$cw = mt_rand(-10, $width + 10);
$ch = mt_rand(-10, $height + 10);
imageellipse($verify, $cx, $cy, $cw, $ch, $color);
imageellipse($verify, $cx + 1, $cy + 1, $cw + 1, $ch + 1, $color);
imageline($verify, 0, $h, $width, $h, $fontColor);
}
//輸入影像
header('Content-type:image/png');
imagepng($verify);
imagedestroy($verify);
return true;
}
/**
* 加蓋圖片水印
* @param [String] $img [圖片路徑]
* @param [String] $water [水印圖路徑]
* @param [String] $save [儲存路徑|留空則替換原圖]
* @return [Boolean]
*/
Static Public function water ($img, $water = '', $save = NULL) {
if (!self::checkCondition($img)) return false;
//初始化引數(放進框架時把常量換成 讀取配置檔案項 )
$water = empty($water) ? C('WATER_IMAGE') : $water;
$pos = C('WATER_POS');
$alpha = C('WATER_ALPHA');
$compression = C('WATER_COMPRESSION');
if (!file_exists($water)) return false;
//原圖寬、高與型別
$imgInfo = getimagesize($img);
$imgW = $imgInfo[0];
$imgH = $imgInfo[1];
$imgT = self::getImageType($imgInfo[2]);
//水印圖寬、高與型別
$waterInfo = getimagesize($water);
$waterW = $waterInfo[0];
$waterH = $waterInfo[1];
$waterT = self::getImageType($waterInfo[2]);
//水印圖大於原圖時不作處理
if ($imgW < $waterW || $imgH < $waterH) return false;
//計算水印位置
$pos = self::getPosition($imgW, $imgH, $waterW, $waterH, $pos);
$x = $pos['x'];
$y = $pos['y'];
//開啟原圖資源
$fn = 'imagecreatefrom' . $imgT;
$image = $fn($img);
//開啟水印圖資源
$fn = 'imagecreatefrom' . $waterT;
$water = $fn($water);
//蓋上水印圖
if ($waterT == 'png') {
imagecopy($image, $water, $x, $y, 0, 0, $waterW, $waterH);
} else {
imagecopymerge($image, $water, $x, $y, 0, 0, $waterW, $waterH, $alpha);
}
//儲存路徑
$save = self::savePath($save, $img);
$fn = 'image' . $imgT;
if ($imgT == 'jpeg') {
$fn($image, $save, $compression);
} else {
$fn($image, $save);
}
//釋放資源
imagedestroy($image);
imagedestroy($water);
return true;
}
/**
* 加蓋文字水印
* @param [String] $img [圖片路徑]
* @param [String] $text [文字內容]
* @param [String] $save [儲存路徑|留空則替換原圖]
* @return [Boolean]
*/
Static Public function text ($img, $text = '', $save = NULL) {
if (!self::checkCondition($img)) return false;
//初始化引數(放進框架時把常量換成 讀取配置檔案項 )
$text = empty($text) ? WATER_TEXT : $text;
$pos = WATER_POS;
$angle = WATER_ANGLE;
$fontSize = WATER_FONTSIZE;
$fontColor = WATER_FONTCOLOR;
$fontFile = WATER_FONTFILE;
$charset = WATER_CHARSET;
$compression = WATER_COMPRESSION;
//文字水印寬、高
$waterInfo = imagettfbbox($fontSize, $angle, $fontFile, $text);
$waterW = $waterInfo[2] - $waterInfo[0];
$waterH = $waterInfo[1] - $waterInfo[7];
//原圖寬、高、型別
$imgInfo = getimagesize($img);
$imgW = $imgInfo[0];
$imgH = $imgInfo[1];
$type = self::getImageType($imgInfo[2]);
//計算水印位置
$pos = self::getPosition($imgW, $imgH, $waterW, $waterH, $pos);
$x = $pos['x'];
$y = $pos['y'] + $fontSize / 2;
//開啟原圖資源
$fn = 'imagecreatefrom' . $type;
$image = $fn($img);
//寫入水印文字
$rgb = self::colorTrans($fontColor);
$color = imagecolorallocate($image, $rgb['red'], $rgb['green'], $rgb['blue']);
$text = iconv($charset, 'UTF-8', $text);
imagettftext($image, $fontSize, $angle, $x, $y, $color, $fontFile, $text);
//儲存路徑
$save = self::savePath($save, $img);
$fn = 'image' . $type;
if ($type == 'jpeg') {
$fn($image, $save, $compression);
} else {
$fn($image, $save);
}
//釋放資源
imagedestroy($image);
return true;
}
/**
* 生成縮圖(等比例縮放)
* @param [String] $img [圖片路徑]
* @param [String] $width [縮略寬度]
* @param [String] $height [縮略高度]
* @param [String] $save [儲存路徑|留空則替換原圖]
* @return [Boolean]
*/
Static Public function thumb ($img, $width = '', $height = '', $save = NULL) {
if (!self::checkCondition($img)) return false;
//初始化引數(放進框架時把常量換成 讀取配置檔案項 )
$width = empty($width) ? THUMB_WIDTH : $width;
$height = empty($height) ? THUMB_HEIGHT : $height;
//原圖寬、高、型別
$imgInfo = getimagesize($img);
$imgW = $imgInfo[0];
$imgH = $imgInfo[1];
$type = self::getImageType($imgInfo[2]);
//縮放比
$ratio = max($width / $imgW, $height / $imgH);
//縮圖大於原圖不作處理
if ($ratio >= 1) return false;
//等比例縮放後寬、高
$width = floor($imgW * $ratio);
$height = floor($imgH * $ratio);
//建立縮圖畫布
if ($type == 'gif') {
$thumb = imagecreate($width, $height);
$color = imagecolorallocate($thumb, 0, 255, 0);
} else {
$thumb = imagecreatetruecolor($width, $height);
//PNG圖片透明處理
if ($type == 'png') {
//關閉混色模式
imagealphablending($thumb, false);
//儲存透明通道
imagesavealpha($thumb, true);
}
}
//開啟原圖資源
$fn = 'imagecreatefrom' . $type;
$image = $fn($img);
//原圖移至縮圖畫布並調整大小
if (function_exists('imagecopyresampled')) {
imagecopyresampled($thumb, $image, 0, 0, 0, 0, $width, $height, $imgW, $imgH);
} else {
imagecopyresized($thumb, $image, 0, 0, 0, 0, $width, $height, $imgW, $imgH);
}
//GIF圖透明處理
if ($type == 'gif') imagecolortransparent($thumb, $color);
//儲存路徑
$save = self::savePath($save, $img);
$fn = 'image' . $type;
$fn($thumb, $save);
//釋放資源
imagedestroy($image);
imagedestroy($thumb);
return true;
}
/**
* 圖片儲存路徑
* @param [String] $save [儲存路徑]
* @param [String] $img [原圖路徑]
* @return [String]
*/
Static Private function savePath ($save, $img) {
if (!$save) return $img;
$pathInfo = pathinfo($img);
$path = rtrim($save, '/') . '/';
is_dir($path) || mkdir($path, 0777, true);
return $path . time() . mt_rand(1000, 9999) . '.' . $pathInfo['extension'];
}
/**
* 計算水印圖位置
* @param [Integer] $IW [原圖寬]
* @param [Integer] $IH [原圖高]
* @param [Integer] $WW [水印寬]
* @param [Integer] $WH [水印高]
* @param [Integer] $pos [九宮格位置]
* @return [Array] [x, y]
*/
Static Private function getPosition ($IW, $IH, $WW, $WH, $pos) {
$x = 20;
$y = 20;
switch ($pos) {
case 1 :
break;
case 2 :
$x = ($IW - $WW) / 2;
break;
case 3 :
$x = $IW - $WW - 20;
break;
case 4 :
$y = ($IH - $WH) / 2;
break;
case 5 :
$x = ($IW - $WW) / 2;
$y = ($IH - $WH) / 2;
break;
case 6 :
$x = $IW - $WW - 20;
$y = ($IH - $WH) / 2;
break;
case 7 :
$y = $IH - $WH - 20;
break;
case 8 :
$x = ($IW - $WW) / 2;
$y = $IH - $WH - 20;
break;
case 9 :
$x = $IW - $WW - 20;
$y = $IH - $WH - 20;
break;
default :
$x = mt_rand(0, $IW - $WW);
$y = mt_rand(0, $IH - $WH);
}
return array('x' => $x, 'y' => $y);
}
/**
* 圖片型別
* @param [Integer] $typeNum [型別識別號]
* @return [String]
*/
Static Private function getImageType ($typeNum) {
switch($typeNum) {
case 1 :
return 'gif';
case 2 :
return 'jpeg';
case 3 :
return 'png';
}
}
/**
* 16進位制色值轉換為RGB
* @param [Sting] $color [16進位制色值]
* @return [Array] [red, green, blue]
*/
Static Private function colorTrans($color) {
$color = ltrim($color, '#');
return array(
'red' => hexdec($color[0] . $color[1]),
'green' => hexdec($color[2] . $color[3]),
'blue' => hexdec($color[4] . $color[5])
);
}
/**
* 影像處理環境檢測
* @return boolean
*/
Static Private function checkCondition ($file = NULL) {
return is_null($file) ? extension_loaded('GD') && function_exists('imagecreatetruecolor') && function_exists('imagepng') : extension_loaded('GD') && file_exists($file);
}
}
?>
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