需要 Line2D 装饰技巧 - Graphics2D [英] Line2D decoration tips needed - Graphics2D

问题描述

我通过 Graphics2D 绘图在我的 JPanel 上布置了 Line2D 和 Arc2D 对象.你可以看看这个问题的一部分如何制作像素完美的 Line2D in - Graphics2D".现在我想要实现的是，我想为所有 Line2D 和 Arc2D 对象创建两条平行线和弧.视觉上，

I have Line2D and Arc2D objects laid out on my JPanel by Graphics2D drawing. You can have a look a part of it on this question " How to make pixel perfect Line2D in - Graphics2D ". Now what I want to achieve is, I want to create two parallel lines and arcs for all Line2D and Arc2D objects. Visually,

当前绘制的法线 Line2D 和 Arc2D，

Normal Line2D and Arc2D drawn currently,

想装饰成这样，

到目前为止我的想法，

我可以通过创建两条不同的线并从我的正常线位置给出偏移量 +gap 和 -gap 来实现这一点.但是，这会产生很多我不想要的对象.

I might be able to achieve this by creating two different line and give an offset +gap and -gap from my normal line position. However This will make lots of objects which I don't want to.

现在，是否可以像这样使我的正常线条更粗，

Now, is it possible to make my normal line thicker like this,

给它们一个边框并从中删除中间位?

有可能实现吗?如果是，请给我一些指导.

Is it possible to achieve this? if yes, May I please have some direction.

感谢您的任何帮助.

推荐答案

使用 BasicStroke 并绘制两次，粗一点和细一点.

Use a BasicStroke and draw it twice, thicker and thinner.

import java.awt.*;
import java.awt.image.*;
import java.awt.geom.*;
import javax.swing.*;

import javax.imageio.ImageIO;
import java.io.File;

class PaintThick {

    public static void main(String[] args) throws Exception {
        int size = 150;
        final BufferedImage bi = new BufferedImage(
            size,size,BufferedImage.TYPE_INT_RGB);
        Graphics2D g = bi.createGraphics();

        double pad = 20;
        Line2D.Double line1 = new Line2D.Double(
            pad,pad,(double)(size-pad),(double)(size-pad));
        int cap = BasicStroke.CAP_BUTT;
        int join = BasicStroke.JOIN_MITER;
        BasicStroke thick = new BasicStroke(15,cap,join);
        BasicStroke thinner = new BasicStroke(13,cap,join);

        g.setColor(Color.WHITE);
        g.fillRect(0,0,size,size);

        g.setColor(Color.BLACK);
        g.setStroke(thick);
        g.draw(line1);

        g.setColor(Color.WHITE);
        g.setStroke(thinner);
        g.draw(line1);

        ImageIO.write(bi,"png",new File("img.png"));
        SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                JOptionPane.showMessageDialog(
                    null, new JLabel(new ImageIcon(bi)));
            }
        });
    }
}

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