更改 JPanel 默认图形
当我有JPanel时，它有默认的图形，它被传递给paint(Graphics g)和类似的函数。我可以以某种方式将默认图形切换为我自己的吗？来自 JPanel 类 之外？我正在寻找类似 JPanel.setGraphics(Graphics g) 的内容。谢谢。
when I have JPanel, it has it´s default Graphics which is passed to paint(Graphics g) and similiar function. Can I somehow switch that default Graphics for my own? From outside of the JPanel class? I am looking for something like JPanel.setGraphics(Graphics g). Thank you.
如果你对这篇内容有疑问，欢迎到本站社区发帖提问 参与讨论，获取更多帮助，或者扫码二维码加入 Web 技术交流群。
绑定邮箱获取回复消息
由于您还没有绑定你的真实邮箱，如果其他用户或者作者回复了您的评论，将不能在第一时间通知您！
发布评论
评论（2）
不可以，但您可以重写其
paintComponent方法，将作为参数传递给Graphics2D的Graphics对象进行强制转换，并在其上绘制您想要的任何内容。No, but you may override its
paintComponentmethod, cast theGraphicsobject passed as argument toGraphics2D, and draw whatever you want on it.据我所知，控制传递哪个 Graphics 对象的唯一方法是启用调试图形选项。这是通过调用
JComponent.setDebugGraphicsOptions(int)来完成的，它将用javax.swing.DebugGraphics的实例替换原始 Graphics 对象。DebugGraphics的实例化是硬编码在JComponent类的getGraphics方法中的，因此我认为这里没有办法使用您自己的实现（除了使用JVM 的工具来重写代码，就像模拟库所做的那样）。As far as I know, the only way to control which Graphics object is passed around is to enable the debug graphics option. This is done by calling
JComponent.setDebugGraphicsOptions(int), which will replace the original Graphics object by an instance ofjavax.swing.DebugGraphics.The instanciation of
DebugGraphicsis hardcoded in the methodgetGraphicsof classJComponent, so I see no way to use your own implementation here (other than using the instrumentation of the JVM to rewrite the code, as mock libraries do).