PHPで簡単にウォーターマークを作る、画像透かしクラスのサンプル
PHPコード：
class WaterMask{
public $waterType = 1; //ウォーターマーク：0文字、1画像
public $pos = 0; //ウォーターマーク位置
public $transparent = 45; //ウォーターマークの透明性
public $waterStr = 'www.itwhy.org’; //ウォーターマーク文字
public $fontSize = 16; //文字フォントサイズ
public $fontColor = array(255,0,255); //透かしの色
public $fontFile = 'AHGBold.ttf’; //フォントファイル
public $waterImg = 'logo.png’; //ウォーターマーク画像
private $srcImg = "; //透かし画像を追加
private $im = "; //画像ハンドル
private $water_im = "; //透かし画像ハンドル
private $srcImg_info = "; //画像情報
private $waterImg_info = "; //透かし画像情報
private $str_w = "; //透かし文字の幅
private $str_h = "; //透かし文字の高さ
private $x = "; //ウォーターマークX座標
private $y = "; //ウォーターマークY座標
function __construct($img) { //デストラクター
$this->srcImg = file_exists($img) ? $img : die('"'.$img.'"ソースファイルが存在しません！’);
}
private function imginfo() { //透かし画像情報を追加
$this->srcImg_info = getimagesize($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('元画像（’.$this->srcImg.’）はPNG、JPEG、GIFをサポート’);
}
}
private function waterimginfo() { 。
$this->waterImg_info = getimagesize($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('ウォーターマーク画像（’.$this->srcImg.’）はPNG、JPEG、GIFのみサポート。’);
}
}
private function waterpos() { //ウォーターマークの位置アルゴリズム
switch ($this->pos) {
case 0: //ランダム配置
$this->x = rand(0,$this->srcImg_info[0]-$this->waterImg_info[0]);
$this->y = rand(0,$this->srcImg_info[1]-$this->waterImg_info[1]);
break 1;
case 1:
$this->x = 0;
$this->y = 0;
break 1;
case 2:
$this->x = ($this->srcImg_info[0]-$this->waterImg_info[0])/2;
$this->y = 0;
break 1;
case 3:
$this->x = $this->srcImg_info[0]-$this->waterImg_info[0];
$this->y = 0;
break 1;
case 4:
$this->x = 0;
$this->y = ($this->srcImg_info[1]-$this->waterImg_info[1])/2;
break 1;
case 5:
$this->x = ($this->srcImg_info[0]-$this->waterImg_info[0])/2;
$this->y = ($this->srcImg_info[1]-$this->waterImg_info[1])/2;
break 1;
case 6:
$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:
$this->x = 0;
$this->y = $this->srcImg_info[1]-$this->waterImg_info[1];
break 1;
case 8:
$this->x = ($this->srcImg_info[0]-$this->waterImg_info[0])/2;
$this->y = $this->srcImg_info[1]-$this->waterImg_info[1];
break 1;
default:
$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] <= $this->waterImg_info[0] || $this->srcImg_info[1] <= $this->waterImg_info[1]){
die('ウォーターマークはオリジナルより大きい！’);
}
$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('ウォーターマークを追加失敗した！’);
break;
}
imagedestroy($this->im);
imagedestroy($this->water_im);
}
}
?>