垂直旋转JTextField [英] Rotating a JTextField vertically

问题描述

我见过很多问题，询问如何以任意角度旋转JLabel或图像。我需要做的就是将我的文本字段旋转90度，但我还没有找到一种特别适合该角度的方法。我以为我正确地复制了答案，但我的文本字段没有旋转。

I've seen a number of questions that ask how to rotate a JLabel or image at an arbitrary angle. All I need to do is rotate my text field 90 degrees, but I haven't found an easier way specifically for that angle. I thought I copied the answers correctly, but my text field is not rotating.

这是我正在做的SSCCE：

Here's an SSCCE of what I'm doing:

import java.awt.Graphics;
import java.awt.Graphics2D;

import javax.swing.JFrame;
import javax.swing.JTextField;
import javax.swing.SwingUtilities;

public class VerticalRotationSSCCE {

private static class VerticalTextField extends JTextField {

    private static final long serialVersionUID = 1L;

    public VerticalTextField(String text) {
        super(text);
    }

    @Override
    protected void paintComponent(Graphics g) {
        Graphics2D g2 = (Graphics2D) g;
        int cx = getWidth() / 2;
        int cy = getHeight() / 2;
        g2.rotate(1/2 * Math.PI, cx, cy);
        super.paintComponent(g2);
    }

}

public static void main(String[] args) {
    SwingUtilities.invokeLater(new Runnable() {

        @Override
        public void run() {
            JFrame frame = new JFrame();
            frame.getContentPane().add(new VerticalTextField("Foo"));
            frame.pack();
            frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
            frame.setVisible(true);
        }

    });
}

}

答案中我缺少什么关于如何旋转组件？

What am I missing from the answers on how to rotate components?

推荐答案

如果不转换交互式组件，则无法有效地轮换交互式组件鼠标坐标，但你可以旋转图形上下文来渲染非 - 交互组件，如 JLabel ，如图所示这里。

You can't usefully rotate interactive components without also transforming the mouse coordinates, but you can rotate the graphics context to render non-interactive components like JLabel, as shown here.

在您的示例中， 1 / 2 * Math.PI！= Math.PI / 2 。

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