Java Applet:浏览器中没有抗锯齿字体(但在 AppletViewer 中)

发布于 2024-10-24 08:11:54 字数 1563 浏览 6 评论 0原文

在 AppletViewer 中,我的 Applet 如下所示: screenshot AppletViewer

在浏览器中,我的 Applet 如下所示: screenshot browser

如您所见,字体未进行抗锯齿处理。而且背景颜色也不一样。所有文本都被剪切在右侧。

那会是什么?

您也可以自己尝试此处


这里我尝试过使用此代码:

System.setProperty("awt.useSystemAAFontSettings","on");
System.setProperty("swing.aatext", "true");

但这只会导致此异常:

java.security.AccessControlException: access denied (java.util.PropertyPermission awt.useSystemAAFontSettings write)
    at java.security.AccessControlContext.checkPermission(AccessControlContext.java:374)
    at java.security.AccessController.checkPermission(AccessController.java:546)
    at java.lang.SecurityManager.checkPermission(SecurityManager.java:532)
    at java.lang.System.setProperty(System.java:742)
    at applets.Termumformungen$in$der$Technik_08_Ethanolloesungen.Applet.init(Applet.java:51)
    at sun.plugin2.applet.Plugin2Manager$AppletExecutionRunnable.run(Plugin2Manager.java:1640)
    at java.lang.Thread.run(Thread.java:680)
Exception: java.security.AccessControlException: access denied (java.util.PropertyPermission awt.useSystemAAFontSettings write)

In the AppletViewer, my Applet looks like this:
screenshot AppletViewer

In the browser, my Applet looks like this:
screenshot browser

As you can see, the font is not antialiased. Also the background color is different. And all the text is cutted on the right side.

What could that be?

You can also try it yourself here.


From here I tried to use this code:

System.setProperty("awt.useSystemAAFontSettings","on");
System.setProperty("swing.aatext", "true");

But that results only in this exception:

java.security.AccessControlException: access denied (java.util.PropertyPermission awt.useSystemAAFontSettings write)
    at java.security.AccessControlContext.checkPermission(AccessControlContext.java:374)
    at java.security.AccessController.checkPermission(AccessController.java:546)
    at java.lang.SecurityManager.checkPermission(SecurityManager.java:532)
    at java.lang.System.setProperty(System.java:742)
    at applets.Termumformungen$in$der$Technik_08_Ethanolloesungen.Applet.init(Applet.java:51)
    at sun.plugin2.applet.Plugin2Manager$AppletExecutionRunnable.run(Plugin2Manager.java:1640)
    at java.lang.Thread.run(Thread.java:680)
Exception: java.security.AccessControlException: access denied (java.util.PropertyPermission awt.useSystemAAFontSettings write)

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世界如花海般美丽 2024-10-31 08:11:54

它应该通过重写 paint 方法来工作,对于每个您想要抗锯齿的组件,如下所示:

static void activateAntiAliasing(Graphics g) {
    try {
        Graphics2D g2d = (Graphics2D)g;

        // for antialiasing geometric shapes
        g2d.setRenderingHint( RenderingHints.KEY_ANTIALIASING,
                              RenderingHints.VALUE_ANTIALIAS_ON );

        // for antialiasing text
        g2d.setRenderingHint( RenderingHints.KEY_TEXT_ANTIALIASING,
                              RenderingHints.VALUE_TEXT_ANTIALIAS_ON );

        // to go for quality over speed
        g2d.setRenderingHint( RenderingHints.KEY_RENDERING,
                              RenderingHints.VALUE_RENDER_QUALITY );
    }
    catch(ClassCastException ignored) {}
}

@Override public void paint(final Graphics g) {
    activateAntiAliasing(g);
    super.paint(g);
}

It should work by overriding the paint method like this for each component where you want to have anti-aliasing:

static void activateAntiAliasing(Graphics g) {
    try {
        Graphics2D g2d = (Graphics2D)g;

        // for antialiasing geometric shapes
        g2d.setRenderingHint( RenderingHints.KEY_ANTIALIASING,
                              RenderingHints.VALUE_ANTIALIAS_ON );

        // for antialiasing text
        g2d.setRenderingHint( RenderingHints.KEY_TEXT_ANTIALIASING,
                              RenderingHints.VALUE_TEXT_ANTIALIAS_ON );

        // to go for quality over speed
        g2d.setRenderingHint( RenderingHints.KEY_RENDERING,
                              RenderingHints.VALUE_RENDER_QUALITY );
    }
    catch(ClassCastException ignored) {}
}

@Override public void paint(final Graphics g) {
    activateAntiAliasing(g);
    super.paint(g);
}
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