Java如何绘制一个圆角的进度条

原始需求是需要在导出的word中放入一个进度条，一开始就想直接贴图片，就想试一试如何直接画出来一个进度条，如下图所示：

 画图左圆角右方的画图比较难处理，因此采用截图的办法，先画一个完整的进度条，再截取到另外一张图片上合成的办法生成，步骤如下

先画一个完整的进度条：

        int width = 400; // 进度条宽度
        int height = 40; // 进度条高度
        int progress = 30; // 进度百分比
        var color1 = new Color(41, 164, 250); //进度条颜色
        var color2 = new Color(228, 228, 228); // 进度条背景色

        // 创建图像缓冲区 背景透明
        BufferedImage image = new BufferedImage(width, height, BufferedImage.TRANSLUCENT);
        Graphics2D g = image.createGraphics();

        g.setColor(color1);
        g.fillRoundRect(0, 0, width, height, height, height);

结果如图：

 按照百分比截取，绘制到第二个图上：

        // 计算进度条长度
        int length = (int) ((progress / 100d) * width);

        // 创建图像缓冲区
        BufferedImage image2 = new BufferedImage(width, height, BufferedImage.TRANSLUCENT);
        Graphics2D g2 = image2.createGraphics();
        // 绘制背景
        g2.setColor(color2);
        g2.fillRoundRect(0, 0, width, height, height, height);
        // 截取图片
        g2.drawImage(image, 0, 0, length, height, 0, 0, length, height, null);

结果如图：

 完整代码如下：

package test.backend;

import org.junit.jupiter.api.Test;

import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.File;

public class ImageTest {

    @Test
    public void processTest() {
        int width = 400; // 进度条宽度
        int height = 40; // 进度条高度
        int progress = 30; // 进度百分比
        var color1 = new Color(41, 164, 250); //进度条颜色
        var color2 = new Color(228, 228, 228); // 进度条背景色

        // 创建图像缓冲区 背景透明
        BufferedImage image = new BufferedImage(width, height, BufferedImage.TRANSLUCENT);
        Graphics2D g = image.createGraphics();

        g.setColor(color1);
        g.fillRoundRect(0, 0, width, height, height, height);


        // 计算进度条长度
        int length = (int) ((progress / 100d) * width);

        // 创建图像缓冲区
        BufferedImage image2 = new BufferedImage(width, height, BufferedImage.TRANSLUCENT);
        Graphics2D g2 = image2.createGraphics();
        // 绘制背景
        g2.setColor(color2);
        g2.fillRoundRect(0, 0, width, height, height, height);
        // 截取图片
        g2.drawImage(image, 0, 0, length, height, 0, 0, length, height, null);

        try {
            File output1 = new File("progressbar1.png");
            ImageIO.write(image, "png", output1);

            File output2 = new File("progressbar.png");
            ImageIO.write(image2, "png", output2);
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            g.dispose();
            g2.dispose();

        }
    }
}