package com.yuanchu.mom.utils;
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import javax.imageio.ImageIO;
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import java.awt.*;
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import java.awt.font.FontRenderContext;
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import java.awt.geom.Rectangle2D;
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import java.awt.image.BufferedImage;
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import java.io.ByteArrayInputStream;
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import java.io.ByteArrayOutputStream;
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import java.io.IOException;
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import java.io.InputStream;
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import java.time.LocalDateTime;
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import java.time.format.DateTimeFormatter;
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/**
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* @Author zhuo
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* @Date 2024/9/28
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*/
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public class DateImageUtil {
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/**
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* 生成 当前日期的画布
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* @return
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*/
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public static InputStream createDateImage(LocalDateTime date) {
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int width = 80;
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int height = 20;
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DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy.MM.dd");
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if (date == null) {
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date = LocalDateTime.now();
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}
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String s = date.format(formatter);
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Font font = new Font("Serif", Font.BOLD, 10);
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// 创建一个画布（背景透明）
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BufferedImage bi = new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB);
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// 获取画布的画笔
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Graphics2D g2 = (Graphics2D) bi.getGraphics();
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// 开始绘图
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g2.setComposite(AlphaComposite.Src); // 确保绘图时是透明背景
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g2.setBackground(new Color(0, 0, 0, 0)); // 背景色为透明
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g2.clearRect(0, 0, width, height);
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g2.setPaint(new Color(0, 0, 0)); // 设置绘制颜色
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FontRenderContext context = g2.getFontRenderContext();
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Rectangle2D bounds = font.getStringBounds(s, context);
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double x = (width - bounds.getWidth()) / 2;
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double y = (height - bounds.getHeight()) / 2;
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double ascent = -bounds.getY();
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double baseY = y + ascent;
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g2.drawString(s, (int) x, (int) baseY);
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g2.dispose(); // 释放画笔资源
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ByteArrayOutputStream os = new ByteArrayOutputStream();
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try {
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ImageIO.write(bi, "png", os);
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} catch (IOException e) {
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throw new RuntimeException(e);
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}
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return new ByteArrayInputStream(os.toByteArray());
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}
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}
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