IMAGICK位置常量
imagick::GRAVITY_NORTHWEST //左上imagick::GRAVITY_NORTH //上边居中
imagick::GRAVITY_NORTHEAST //右上
imagick::GRAVITY_WEST //左侧居中
imagick::GRAVITY_CENTER //居中
imagick::GRAVITY_EAST //右侧居中
imagick::GRAVITY_SOUTHWEST //左下角
imagick::GRAVITY_SOUTH //底部居中
imagick::GRAVITY_SOUTHEAST //右上角
用法示例：
<?php
header("Content-Type: text/html;charset=utf-8");
$canvas = new Imagick('1.jpg');
$canvas->setImageResolution(118.11,118.11);//设置分辨率像素/厘米
$canvas->thumbnailImage(1110,697);//设置画面像素尺寸
$draw = new ImagickDraw();
$draw->setFontSize(60);//设置字体大小
$draw->setTextUnderColor(new ImagickPixel ('#cccccc'));//设置背景色
$draw->setFont("FZDBSJ.TTF");//设置字体
$draw->setFillColor (new ImagickPixel('#000000'));//设置字体颜色
$draw->setGravity(Imagick::GRAVITY_NORTHEAST);//设置水印位置
$draw->setFillAlpha(1.0);
$draw->annotation(20, 20, "文字以及文字对应setGravity的距离");
$canvas->drawImage($draw);
$canvas->writeImage('new1.jpg');
header("Content-Type: image/jpg");
echo $canvas;
?>必须安装ImageMagick php_imagick.dll 要存在1.jpg 和 FZDBSJ.TTF字体文件
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