/**
*
* 文字水印
* @param unknown_type $data
*/
public function addWaterText($data)
{
$draw = new ImagickDraw();
$this->ImagickPixel = new ImagickPixel();
$draw->clear();
$draw->setfont($data['font']);
$draw->setfontsize($data['size']);
$this->ImagickPixel->setcolor($data['color']);
$draw->setfillcolor($data['color']);
$draw->setfillalpha($data['alpha']);
$draw->settextalignment(imagick::GRAVITY_NORTHWEST);
//左对齐
$draw->annotation($data['pos_x'], $data['pos_y'], $data['literal']);
$this->srcImg_source->drawimage($draw);
$draw->destroy();
return $this->srcImg_source;
}