$this->srcimg = file_exists($img) ? $img : die(''.$img.' 源文件不存在！'); } private function imginfo() { //获取需要添加水印的图片的信息，并载入图片。 $this->srcimg_info = getimagesize($this->srcimg); switch ($this->srcimg_info[2]) { case 3: $this->im = imagecreatefrompng($this->srcimg); break 1; case 2: $this->im = imagecreatefromjpeg($this->srcimg); break 1; case 1: $this->im = imagecreatefromgif($this->srcimg); break 1; default: die('原图片（'.$this->srcimg.'）格式不对，只支持png、jpeg、gif。'); } } private function waterimginfo() { //获取水印图片的信息，并载入图片。 $this->waterimg_info = getimagesize($this->waterimg); switch ($this->waterimg_info[2]) { case 3: $this->water_im = imagecreatefrompng($this->waterimg); break 1; case 2: $this->water_im = imagecreatefromjpeg($this->waterimg); break 1; case 1: $this->water_im = imagecreatefromgif($this->waterimg); break 1; default: die('水印图片（'.$this->srcimg.'）格式不对，只支持png、jpeg、gif。'); } } private function waterpos() { //水印位置算法 switch ($this->pos) { case 0: //随机位置 $this->x = rand(0,$this->srcimg_info[0]-$this->waterimg_info[0]); $this->y = rand(0,$this->srcimg_info[1]-$this->waterimg_info[1]); break 1; case 1: //上左 $this->x = 0; $this->y = 0; break 1; case 2: //上中 $this->x = ($this->srcimg_info[0]-$this->waterimg_info[0])/2; $this->y = 0; break 1; case 3: //上右 $this->x = $this->srcimg_info[0]-$this->waterimg_info[0]; $this->y = 0; break 1; case 4: //中左 $this->x = 0; $this->y = ($this->srcimg_info[1]-$this->waterimg_info[1])/2; break 1; case 5: //中中 $this->x = ($this->srcimg_info[0]-$this->waterimg_info[0])/2; $this->y = ($this->srcimg_info[1]-$this->waterimg_info[1])/2; break 1; case 6: //中右 $this->x = $this->srcimg_info[0]-$this->waterimg_info[0]; $this->y = ($this->srcimg_info[1]-$this->waterimg_info[1])/2; break 1; case 7: //下左 $this->x = 0; $this->y = $this->srcimg_info[1]-$this->waterimg_info[1]; break 1; case 8: //下中 $this->x = ($this->srcimg_info[0]-$this->waterimg_info[0])/2; $this->y = $this->srcimg_info[1]-$this->waterimg_info[1]; break 1; default: //下右 $this->x = $this->srcimg_info[0]-$this->waterimg_info[0]; $this->y = $this->srcimg_info[1]-$this->waterimg_info[1]; break 1; } } private function waterimg() { if ($this->srcimg_info[0] waterimg_info[0] || $this->srcimg_info[1] waterimg_info[1]){ die('水印比原图大！'); } $this->waterpos(); $cut = imagecreatetruecolor($this->waterimg_info[0],$this->waterimg_info[1]); imagecopy($cut,$this->im,0,0,$this->x,$this->y,$this->waterimg_info[0],$this->waterimg_info[1]); $pct = $this->transparent; imagecopy($cut,$this->water_im,0,0,0,0,$this->waterimg_info[0],$this->waterimg_info[1]); imagecopymerge($this->im,$cut,$this->x,$this->y,0,0,$this->waterimg_info[0],$this->waterimg_info[1],$pct); } private function waterstr() { $rect = imagettfbbox($this->fontsize,0,$this->fontfile,$this->waterstr); $w = abs($rect[2]-$rect[6]); $h = abs($rect[3]-$rect[7]); $fontheight = $this->fontsize; $this->water_im = imagecreatetruecolor($w, $h); imagealphablending($this->water_im,false); imagesavealpha($this->water_im,true); $white_alpha = imagecolorallocatealpha($this->water_im,255,255,255,127); imagefill($this->water_im,0,0,$white_alpha); $color = imagecolorallocate($this->water_im,$this->fontcolor[0],$this->fontcolor[1],$this->fontcolor[2]); imagettftext($this->water_im,$this->fontsize,0,0,$this->fontsize,$color,$this->fontfile,$this->waterstr); $this->waterimg_info = array(0=>$w,1=>$h); $this->waterimg(); } function output() { $this->imginfo(); if ($this->watertype == 0) { $this->waterstr(); }else { $this->waterimginfo(); $this->waterimg(); } switch ($this->srcimg_info[2]) { case 3: imagepng($this->im,$this->srcimg); break 1; case 2: imagejpeg($this->im,$this->srcimg); break 1; case 1: imagegif($this->im,$this->srcimg); break 1; default: die('添加水印失败！'); break; } imagedestroy($this->im); imagedestroy($this->water_im); } } ?>
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