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hawind
2021-02-22 12:17:00 +08:00
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<?php namespace App\Support;
/**
* 作者：Wang
* 创建时间：2006-12-18
* 修改时间：2012-11-22
* 类名：Image
* 功能：生成多种类型的缩略图
*/
/**
* 演示
* $img = new Image();
* $img->cut('imgx.jpg', 400, 280, 3, false);
* // 图片水印
* // $img->mark('logo1.png', '', 3);
* // 文字水印
* $img->mark('FV.Zone Test', 40, 3, 2, 2, 5, 5, '#ffffff', '#000000', 80, 20);
* // $img->save('ss.jpg');
* // $img->show();
* echo $img->msg();
*/
class Image
{
public $srcw;
public $srch;
public $destw;
public $desth;
// 原图类型
public $type;
// 生成的数据
public $cache;
public $image;
public $mime;
// 将16进制的颜色转换成10进制的(R, G, B)
public function hexdec($color)
{
$color = ltrim($color, '#');
$match = str_split($color, 2);
if (count($match) == 3) {
$rgb['r'] = hexdec($match[0]);
$rgb['g'] = hexdec($match[1]);
$rgb['b'] = hexdec($match[2]);
}
return $rgb;
}
// 水印函数
public function mark($source, $alpha = 100, $seat = 1, $type = 1, $font_type = 3, $font_x = 10, $font_y = 10, $font_bgcolor = '#ffffff', $font_color = '#000000', $font_w = 80, $font_h = 20)
{
// 图片水印
if ($type == 1) {
list($w, $h, $t) = getimagesize($source);
// 水印图片大于原图
if ($w > $this->srcw || $h > $this->srch) {
throw new Exception('水印图片大于原图。');
}
switch ($t) {
case 1:
$water = imagecreatefromgif($source);
break;
case 2:
$water = imagecreatefromjpeg($source);
break;
case 3:
$water = imagecreatefrompng($source);
imagesavealpha($water, true);
break;
}
// 文字水印
} else {
// 文字水印大于原图
if ($font_w > $this->srcw || $font_h > $this->srch) {
throw new Exception('文字水印大于原图。');
}
// 创建一个真彩色图片
$water = imagecreatetruecolor($font_w, $font_h);
// 转换文字颜色值
$font_color = $this->hexdec($font_color);
// 转换背景颜色值
$font_bgcolor = $this->hexdec($font_bgcolor);
$color = imagecolorallocate($water, $font_color['r'], $font_color['g'], $font_color['b']);
$bgcolor = imagecolorallocate($water, $font_bgcolor['r'], $font_bgcolor['g'], $font_bgcolor['b']);
// 背景色填充
imagefill($water, 0, 0, $bgcolor);
// 绘制文字
imageString($water, $font_type, $font_x, $font_y, $source, $color);
$w = $font_w;
$h = $font_h;
}
switch ($seat) {
case 1:
$x = 10;
$y = 0;
break;
case 2:
$x = ($this->destw - $w)/2;
$y = ($this->desth - $h)/2;
break;
case 3:
$x = $this->destw - $w - 10;
$y = $this->desth - $h - 10;
break;
default:
$x = 10;
$y = 0;
}
// png 24位，真彩色不需要透明设置
if ($t == 3) {
imagecopy($this->cache, $water, $x, $y, 0, 0, $w, $h);
} else {
imagecopymerge($this->cache, $water, $x, $y, 0, 0, $w, $h, $alpha);
}
}
public function crop($file, $width, $height, $mode, $center)
{
// 原文件不存在
if (!is_file($file)) {
throw new Exception('原文件不存在。');
}
$temp = getimagesize($file);
$this->srcw = $srcw = $temp[0];
$this->srch = $srch = $temp[1];
$this->type = $temp[2];
// 1=gif 2=jpg 3=png
$this->mime = $temp['mime'];
switch ($this->type) {
case 1:
$image = imagecreatefromgif($file);
break;
case 2:
$image = imagecreatefromjpeg($file);
break;
case 3:
$image = imagecreatefrompng($file);
break;
}
if (!$image) {
return;
}
if (function_exists('imageantialias')) {
imageantialias($image, true);
}
// 原始宽高比大于目标宽高比, 则取目标
$this->image = $image;
$destw = $w = $width;
$desth = $h = $height;
$srcx = $srcy = 0;
// 按宽度等比例缩放
switch ($mode) {
case 1:
$desth = ceil($srch / $srcw * $destw);
break;
case 2:
$destw = ceil($srcw / $srch * $desth);
break;
case 3:
// 原始宽高比目标宽高大，调整原始复制宽度
if ($srcw/$srch > $w/$h) {
$oldw = $srcw;
$srcw = ceil($w / $h * $srch);
if ($center) {
$srcx = ceil(($oldw - $srcw)/2);
}
} else {
// 调整原始复制高度
$oldh = $srch;
$srch = ceil($h / $w * $srcw);
if ($center) {
$srcy = ceil(($oldh - $srch)/2);
}
}
break;
}
$this->destw = $destw;
$this->desth = $desth;
$this->cache = imagecreatetruecolor($destw, $desth);
if (function_exists('imagecopyresampled')) {
imagecopyresampled($this->cache, $image, 0, 0, $srcx, $srcy, $destw, $desth, $srcw, $srch);
} else {
imagecopyresized($this->cache, $image, 0, 0, $srcx, $srcy, $destw, $desth, $srcw, $srch);
}
}
public function save($path, $quality = 100)
{
switch ($this->type) {
case 1:
imagegif($this->cache, $path);
break;
case 2:
imagejpeg($this->cache, $path, $quality);
break;
case 3:
imagepng($this->cache, $path);
break;
}
if ($this->image) {
imageDestroy($this->image);
}
}
public function display($quality = 100)
{
header("Content-type: $this->mime");
switch ($this->type) {
case 1:
imagegif($this->cache, $path);
break;
case 2:
imagejpeg($this->cache, $path, $quality);
break;
case 3:
imagepng($this->cache, $path);
break;
}
imageDestroy($this->image);
}
}