dyuitTools/dyu/application/common/service/watermark/image/Image.php

<?php

namespace app\common\service\watermark\image;

use Grafika\Color;
use Grafika\Grafika;
use Grafika\ImageType;

class Image
{

	/**
	 * [waterMark]
	 *
	 * @Author: Yeshihao
	 * @DateTime: 2023/11/14 14:45
	 * @param     $filePath //文件路径
	 * @param     $waterText //水印文字
	 * @param int $type 0不倾斜 1倾斜
	 * @return bool
	 * @throws
	 */
	public function waterMark($filePath, $waterText, $type = 0, $waterText2 = '', $width = 0, $height = 0)
	{
		// 1 打开海报背景图
		$editor = Grafika::createEditor(['Gd']);
		$editor->open($backdropImage, $filePath);
		// 获取背景图宽高
		$size = getimagesize($filePath);
		//获取文字类型路劲
		$fontPath = Grafika::fontsDir().DS.'st-heiti-light.ttc';
		//获取文字数量
		$fontNum = mb_strlen($waterText);
		// 3.创建文字图片
		//判断是否需要添加水印
		if ($type) {
			//获取斜边长度
			$hypo = hypot($size[0], $size[1]);
			// 判断文字图片开始的位置
			$fontSize = intval($hypo) / $fontNum * 0.5;
			// 获取文字大小宽高
			$fontSizeArr = $this->get_text_box($waterText, $fontSize, $fontPath);
			$fontX       = intval(($size[0] * (($hypo - $fontSizeArr[0]) / 2)) / $hypo);
			$fontY       = $size[1] - intval(($size[1] * (($hypo - $fontSizeArr[0]) / 2)) / $hypo);
			//计算倾斜角度
			$angle = intval(atan($size[1] / $size[0]) * 180 / pi());
			$image = imagecreatetruecolor($size[0], $size[1]);
		} else {
			// 判断文字图片开始的位置
			$fontSize = $size[0] / $fontNum;
			// 获取文字大小宽高
			$fontSizeArr = $this->get_text_box($waterText, $fontSize, $fontPath);
			$fontX       = 0;
			$fontY       = 0;
			$angle       = 0;
			$image       = imagecreatetruecolor($fontSizeArr[0], $fontSizeArr[1]);
		}
		imagesavealpha($image, true);
		// 设置透明度
		$frontImageSource = imagecolorallocatealpha($image, 0, 0, 0, 127);
		imagefill($image, 0, 0, $frontImageSource);
		//生成文字透明背景板
		$fontImage = new \Grafika\Gd\Image($image, '', imagesx($image), imagesy($image), ImageType::PNG);

		//设置文字颜色
		$Color = new Color('#cccccc');
		$editor->text($fontImage, $waterText, $fontSize, $fontX, $fontY, $Color, $fontPath, $angle);
		if ($waterText2) {
			$editor->text($fontImage, $waterText2, $fontSize, $fontX + $fontSize, $fontY + $fontSize, $Color, $fontPath, $angle);
		}

		//合并图片
		$editor->blend($backdropImage, $fontImage, 'overlay', 1, 'center');
		// 保存图片
		$editor->save($backdropImage, $filePath);
		return true;
	}

	/**
	 * [get_text_box]
	 * 根据文字获取宽高
	 *
	 * @Author: Yeshihao
	 * @DateTime: 2023/11/14 10:04
	 * @param $text
	 * @param $size
	 * @param $font
	 * @return array
	 */
	private function get_text_box($text, $size, $font)
	{
		$point  = imagettfbbox($size, 0, $font, $text);
		$width  = $point[4] - $point[6];
		$height = $point[1] - $point[7];
		return [$width, $height];
	}
}