Canvas3D没有出现在Swing窗口中

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问题描述

我试图在Swing JPanel中插入一个Canvas3D对象，但代码似乎没有工作（即没有任何反应）：

I am attempting to insert a Canvas3D object inside a Swing JPanel, but the code doesn't seem to be working (i.e. nothing happens):


        Canvas3D canvas = new Canvas3D(SimpleUniverse.getPreferredConfiguration());
        SimpleUniverse universe = new SimpleUniverse(canvas);
        BranchGroup root = new BranchGroup();
        root.addChild(new ColorCube());
        universe.addBranchGraph(root);
        universe.getViewingPlatform().setNominalViewingTransform();
        canvasPanel.add(canvas);

我缺少什么？ JPanel是使用NetBean的Visual Editor创建的。

What am I missing? The JPanel was created using NetBean's Visual Editor.

推荐答案

可能你必须在面板上设置一个布局管理器，它会自动扩展儿童组成部分到整个区域。默认情况下，JPanel具有FlowLayout，不扩展子组件。您可以通过调用来尝试BorderLayout：

Probably you have to set a layout manager on the panel, which automatically expands the child components to the full area. A JPanel has a FlowLayout by default, which does not expand the child components. You could try a BorderLayout instead by calling:

canvasPanel.setLayout(new BorderLayout());

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