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丰富水印及文字功能 #21

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丰富水印及文字功能 #21

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9ac548b
生成水印时，支持从string字符串的图片中获取水印资源
zhyfor Apr 24, 2022
183f947
自定义文字坐标：支持位置居中关键字
zhyfor Apr 24, 2022
f786a03
添加水印：增加偏移量功能
zhyfor Apr 24, 2022
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67 changes: 51 additions & 16 deletions src/Image.php
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Original file line number Diff line number Diff line change
Expand Up @@ -140,6 +140,15 @@ public function save($pathname, $type = null, $quality = 80, $interlace = true)
return $this;
}

/**
* 获取到image资源
* @return resource
*/
public function getIm()
{
return $this->im;
}

/**
* 返回图像宽度
* @return int 图像宽度
Expand Down Expand Up @@ -377,24 +386,33 @@ public function thumb($width, $height, $type = self::THUMB_SCALING)
/**
* 添加水印
*
* @param string $source 水印图片路径
* @param string $source 水印图片路径,或者string格式的图片字符串
* @param int|array $locate 水印位置
* @param int $alpha 透明度
* @param int|array $offset 偏移量
* @return $this
*/
public function water($source, $locate = self::WATER_SOUTHEAST, $alpha = 100)
public function water($source, $locate = self::WATER_SOUTHEAST, $alpha = 100, $offset = 0)
{
if (!is_file($source)) {
throw new ImageException('水印图像不存在');
}
//获取水印图像信息
$info = getimagesize($source);
if (false === $info || (IMAGETYPE_GIF === $info[2] && empty($info['bits']))) {
throw new ImageException('非法水印文件');
if(strlen($source) < 200){
if (!is_file($source)) {
throw new ImageException('水印图像不存在');
}
//获取水印图像信息
$info = getimagesize($source);
if (false === $info || (IMAGETYPE_GIF === $info[2] && empty($info['bits']))) {
throw new ImageException('非法水印文件');
}
//创建水印图像资源
$fun = 'imagecreatefrom' . image_type_to_extension($info[2], false);
$water = $fun($source);
}else{
$water = imagecreatefromstring($source);
$info = [
imagesx($water),
imagesy($water),
];
}
//创建水印图像资源
$fun = 'imagecreatefrom' . image_type_to_extension($info[2], false);
$water = $fun($source);
//设定水印图像的混色模式
imagealphablending($water, true);
/* 设定水印位置 */
Expand Down Expand Up @@ -451,15 +469,24 @@ public function water($source, $locate = self::WATER_SOUTHEAST, $alpha = 100)
throw new ImageException('不支持的水印位置类型');
}
}

/* 设置偏移量 */
if (is_array($offset)) {
$offset = array_map('intval', $offset);
list($ox, $oy) = $offset;
} else {
$offset = intval($offset);
$ox = $oy = $offset;
}
do {
//添加水印
$src = imagecreatetruecolor($info[0], $info[1]);
// 调整默认颜色
$color = imagecolorallocate($src, 255, 255, 255);
imagefill($src, 0, 0, $color);
imagecopy($src, $this->im, 0, 0, $x, $y, $info[0], $info[1]);
imagecopy($src, $this->im, 0, 0, $x + $ox, $y + $oy, $info[0], $info[1]);
imagecopy($src, $water, 0, 0, 0, 0, $info[0], $info[1]);
imagecopymerge($this->im, $src, $x, $y, 0, 0, $info[0], $info[1], $alpha);
imagecopymerge($this->im, $src, $x + $ox, $y + $oy, 0, 0, $info[0], $info[1], $alpha);
//销毁临时图片资源
imagedestroy($src);
} while (!empty($this->gif) && $this->gifNext());
Expand Down Expand Up @@ -545,8 +572,16 @@ public function text($text, $font, $size, $color = '#00000000',
/* 自定义文字坐标 */
if (is_array($locate)) {
list($posx, $posy) = $locate;
$x += $posx;
$y += $posy;
if('middle' == $posx){
$x += ($this->info['width'] - $w) / 2;
}else{
$x += $posx;
}
if('middle' == $posy){
$y += ($this->info['height'] - $h) / 2;
}else{
$y += $posy;
}
} else {
throw new ImageException('不支持的文字位置类型');
}
Expand Down