放大 Java Swing 申请

Question

I am looking for ways to zoom in a Java Swing application. That means that I would like to resize all components in a given JPanel by a given factor as if I would take an screenshot of the UI and just applied an "Image scale" operation. The font size as well as the size of checkboxes, textboxes, cursors etc. has to be adjusted. It is possible to scale a component by applying transforms to a graphics object:

 protected Graphics getComponentGraphics(Graphics g) {
  Graphics2D g2d=(Graphics2D)g;

  g2d.scale(2, 2);

  return super.getComponentGraphics(g2d);
 }

That works as long as you don't care about self-updating components. If you have a textbox in your application this approach ceases to work since the textbox updates itself every second to show the (blinking) cursor. And since it doesn't use the modified graphics object this time the component appears at the old location. Is there a possibility to change a components graphics object permanently? There is also a problem with the mouse click event handlers. The other possibility would be to resize all child components of the JPanel (setPreferredSize) to a new size. That doesn't work for checkboxes since the displayed picture of the checkbox doesn't change its size. I also thought of programming my own layout manager but I don't think that this will work since layout managers only change the position (and size) of objects but are not able to zoom into checkboxes (see previous paragraph). Or am I wrong with this hypothesis? Do you have any ideas how one could achieve a zoomable Swing GUI without programming custom components? I looked for rotatable user interfaces because the problem seems familiar but I also didn't find any satisfying solution to this problem.

Thanks for your help, Chris

Answer 1

You could give a try to the JXLayer library .

There are several tools in it, which could help you to make a zoom. Check the examples shown here . I would recommend you to read more about the TransformUI, from this library. From the example, it seems like it could help solving your problem.

Answer 2

Scaling the view is easy enough; transforming mouse coordinates is only slightly more difficult. Here's an elementary example . I'd keep JComponent s out, although it might make sense to develop an analogous ScaledComponent that knows about the geometry. That's where @Gnoupi's suggestion of using a library comes in.

Answer 3

You might find Piccolo2D.java API useful: http://code.google.com/p/piccolo2d/

It is very simple.

It touts in particular its smooth zooming. You essentially make a "canvas" that can contain various elements, and can then zoom by just holding right-click and panning the mouse back and forth.

I worked on a team that used it to create this: http://sourceforge.net/apps/mediawiki/guitar/index.php?title=WebGuitar#EFG.2FGUI_Visualizer

The nodes you see there are clickable links themselves.

Answer 4

嘿你可以尝试这个如果你想像任何其他图像查看器一样缩放图像使用JPanel绘制图像使用drawImage（）方法现在创建一个按钮，当你单击按钮增加框架上面板的大小它出现就像在缩放中查看图像一样

Answer 5

Since Java 9, there are VM arguments (actually meant to be used for high dpi scaling) that can render a application with a higher scaling factor:

java -Dsun.java2d.uiScale=2.0 -jar MyApplication.jar

Or:

java -Dsun.java2d.win.uiScaleX=2.0 -Dsun.java2d.win.uiScaleY=2.0 -jar MyApplication.jar