如何在Java AWT和/或Swing中更改光标图像？ [英] How to change the cursor image in Java AWT and/or Swing?

问题描述

我正在制作一个简单的图形编辑器（即绘图程序）。我不打算任何花哨，但我希望我的程序，当它进入绘画面板时，将鼠标光标更改为类似+或O。像在Photoshop或GIMP。

I'm making a simple graphics editor (i.e a paint program). I am not planning on anything fancy, but I do want my program to change the mouse cursor to something like a "+" or an "O" when it enters the Paint Panel. like in Photoshop or GIMP.

做这个？我在AWT / Swing线程中找不到任何有关如何更改鼠标光标的信息。

How would I do this? I can't find anything in AWT / Swing threads on how to change the mouse cursor.

推荐答案

比任何默认游标更奇怪：它可以创建一个自定义光标（如果工具包支持它）显示任意自定义图像。粗糙（无光泽的视觉效果）示例：

Just in case someone wants something more "fancy" than any of the default cursors: it's possible to create a custom cursor (provided the Toolkit supports it) showing an arbitrary custom image. A crude (no shiny visuals) example:

    Toolkit kit = Toolkit.getDefaultToolkit();
    Dimension dim = kit.getBestCursorSize(48, 48);
    BufferedImage buffered = GraphicsUtilities.createCompatibleTranslucentImage(dim.width, dim.height);
    Shape circle = new Ellipse2D.Float(0, 0, dim.width - 1, dim.height - 1);
    Graphics2D g = buffered.createGraphics();
    g.setColor(Color.BLUE);
    g.draw(circle);
    g.setColor(Color.RED);
    int centerX = (dim.width - 1) /2;
    int centerY = (dim.height - 1) / 2;
    g.drawLine(centerX, 0, centerX, dim.height - 1);
    g.drawLine(0, centerY, dim.height - 1, centerY);
    g.dispose();
    Cursor cursor = kit.createCustomCursor(buffered, new Point(centerX, centerY), "myCursor");

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