java 画布与面板
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Canvas vs. Panel
提问by Anonymous181
If I want to display ellipses and rectangles on a screen, should I use a canvas or a JPanel?
如果我想在屏幕上显示椭圆和矩形，我应该使用画布还是 JPanel？
What is the difference? When do I use each?
有什么区别？我什么时候使用每个？
采纳答案by JB Nizet
In general, if you're using Swing, you should only use Swing components. Mixing Swing and AWT components in the same GUI leads to strange results. So I would use a JPanel, or a raw JComponent.
通常，如果您使用 Swing，则应该只使用 Swing 组件。在同一个 GUI 中混合 Swing 和 AWT 组件会导致奇怪的结果。所以我会使用 JPanel 或原始 JComponent。
回答by paulsm4
Canvasis an AWT object; JPanelis a lightweight Java Swing object. If you have a Java Swing GUI, I'd strongly recommend using JPanel.
Canvas是一个 AWT 对象；JPanel是一个轻量级的 Java Swing 对象。如果您有 Java Swing GUI，我强烈建议您使用JPanel.
Here's a good link on JPanel:
这是JPanel上的一个很好的链接：
In the simplest case, you use a
JPanelexactly the same way as you would aPanel. Allocate it, drop components in it, then add theJPanelto someContainer. However,JPanelalso acts as a replacement forCanvas(there is noJCanvas)...
在最简单的情况下，您使用 a
JPanel的方式与使用Panel. 分配它，将组件放入其中，然后添加JPanel到 someContainer。但是，JPanel也可以作为Canvas（没有JCanvas）...的替代品 。
回答by Paul Vargas
Or you can use a JLabelif you want display static images like icons.
或者，JLabel如果您想显示图标等静态图像，则可以使用 a 。
BufferedImage image=
new BufferedImage(100, 50, BufferedImage.TYPE_INT_ARGB);
Graphics2D g2 = image.createGraphics();
// draw
g2.draw(new Ellipse2D.Double(x, y, rectwidth,rectheight));
g2.fill (new Ellipse2D.Double(0, 0, 100, 50));
JLabel label = new JLabel(new ImageIcon( image ));
回答by DSOI__UNUNOCTIUM
That kind of depends on what you like, but, I would use JFrame, it directly creates a window, and you can draw onto it. Canvas has its advantages, it let's you write one less import, it also separates window stuff from canvas graphics stuff, but it has its the disadvantages of not having access to window. it depends on what you like and need.
这取决于你喜欢什么，但是，我会使用 JFrame，它直接创建一个窗口，你可以在它上面画画。Canvas 有它的优点，它让你少写一个导入，它还将窗口内容与画布图形内容分开，但它的缺点是无法访问窗口。这取决于你喜欢什么和需要什么。
