Java 颠倒文本 - 错误还是功能? [英] Java Upside Down Text - Bug or Feature?

问题描述

在使用 Java 字体类和 Swing 时，我将字体大小设置为负值.

While playing around with the Java font class and Swing, I set the font size to a negative value.

我发现这会使文本被倒置.这是错误还是功能?谁能解释为什么会发生这种行为?

I discovered that this makes the text be drawn upside down. Is this a bug or a feature? Can anyone explain why this behavior happens?

试试看:

import java.awt.Font;
import java.awt.Graphics;

import javax.swing.JFrame;
import javax.swing.JPanel;

public class UpsideDown extends JFrame{

    public UpsideDown(){
        setSize(500,500);
        setContentPane(new Panel());
        setVisible(true);
    }

    public class Panel extends JPanel{
        public void paintComponent(Graphics g){
            Font f = new Font("Sans-Serif", Font.PLAIN, -50);
            g.setFont(f);
            g.drawString("Upside Down", 400, 100);
        }
    }

    public static void main(String args[]){
        new UpsideDown();
    }
}

推荐答案

好像是这样:

1. Swing 将字体的高度向下绘制，因为它将字体大小乘以字体的字形高度.-50 * glyph_height 是负数 -> 向下绘制而不是向上绘制.
2. 它还向左绘制字形(字母的)宽度，同样是因为它将您的字体大小乘以字体指定的字形宽度.

1. Swing draws your font's height downwards, because it multiplies the font size with the glyph height of the font. -50 * glyph_height is negative -> drawing downwards instead of upwards.
2. It also draws the glyph's (the letter's) width to the left, again because it multiplies your font size with the glyph width specified by the font.

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