blocks|key|1271884|text|Swing将为您组合重绘:参见Sun网站上的"Painting+in+AWT+and+Swing"。如果您计划快速连续地进行多次重绘，它们将合并到一个对paintImmediately()的调用中。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1271885|entityMap|0|LINK|mutability|MUTABLE|url|http://java.sun.com/products/jfc/tsc/articles/painting/#swing^0|M|R|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

Swing will combine repaints for you: see <a href="http://java.sun.com/products/jfc/tsc/articles/painting/#swing" rel="nofollow noreferrer">"Painting in AWT and Swing"</a> on Sun's website. If you schedule a number of repaints in rapid succession, they'll get combined into a single call to paintImmediately().

blocks|key|199521|text|频繁的重绘请求会自动合并为一个请求。优化这一点的最好方法不是重新绘制整个对象，而是使用特定区域的坐标调用repaint。这意味着你只需要重新绘制实际改变的区域。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|199522|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

Frequent repaint requests are automatically collapsed into one. The best way to optimize this is not to repaint the whole thing, but call repaint with coordinates of specific area. This means you repaint only the area which actually changed.

blocks|key|4488341|text|我的理解是，repaint()只是通过将组件的一个区域添加到重绘队列来调度重绘。如果已经在组件上请求了重绘，则新的重绘区域将仅与先前请求的区域联合。在处理完事件队列中的所有其他事件之前，实际上不会执行重绘。所以，你额外的重绘可能不会有太大的不同，即你的绘画代码只会被执行一次。参见JComponent.repaint和RepaintManager.addDirtyregion。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|4488342|entityMap|0|LINK|mutability|MUTABLE|url|http://java.sun.com/javase/6/docs/api/javax/swing/JComponent.html#repaint(long,%2520int,%2520int,%2520int,%2520int)|1|http://java.sun.com/javase/6/docs/api/javax/swing/RepaintManager.html#addDirtyRegion(javax.swing.JComponent,%2520int,%2520int,%2520int,%2520int))^0|6|9|3W|I|0|4F|T|1|0^^$0|@$1|2|3|4|5|6|7|P|8|@$9|Q|A|R|B|C]]|D|@$9|S|A|T|1|U]|$9|V|A|W|1|X]]|E|$]]|$1|F|3|-4|5|6|7|Y|8|@]|D|@]|E|$]]]|G|$H|$5|I|J|K|E|$L|M]]|N|$5|I|J|K|E|$L|O]]]]

My understanding is that <code>repaint()</code> simply schedules a repaint by adding a region of the component to the repaint queue. If a repaint has already been requested on a component, the new repaint region will just be unioned with the previously requested regions. The repaint is not actually executed until all other events in the event queue are handled. So, your additional repaints may not make much of a difference, i.e. your painting code will only be executed once. See <a href="http://java.sun.com/javase/6/docs/api/javax/swing/JComponent.html#repaint(long,%20int,%20int,%20int,%20int)" rel="nofollow noreferrer">JComponent.repaint</a> and <a href="http://java.sun.com/javase/6/docs/api/javax/swing/RepaintManager.html#addDirtyRegion(javax.swing.JComponent,%20int,%20int,%20int,%20int)" rel="nofollow noreferrer">RepaintManager.addDirtyregion</a>.

blocks|key|1271942|text|我将一些类似的东西组合在一起，以改进JFreechart在调用大量重新绘制时决定绘制的方式。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1271943|从本质上讲，我要做的是：|1271944|1271945|在类中创建一个ScheduledExecutorService作为字段|unordered-list-item|offset|length|style|CODE|1271946|Receive+first+repaint+request，并将其测试给执行器，以便在50毫秒内运行在EDT上获取未来的|1271947|接收第二个request+-+submit以查看上一次重新绘制是否已完成(fut.isDone())，如果已完成，则安排下一次重新绘制；否则不执行任何操作。<代码>H29<代码>F210|1271948|1271949|这样一来，你每秒最多只能收到20个重绘请求。|1271950|我做过类似的事情，当许多变化同时发生时，对fireDataTableChanged的调用数量进行批量处理。|1271951|entityMap^0|0|0|0|7|O|0|0|F|6|11|C|0|0|0|L|K|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|X|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|Y|8|@]|9|@]|A|$]]|$1|E|3|F|5|G|7|Z|8|@$H|10|I|11|J|K]]|9|@]|A|$]]|$1|L|3|M|5|G|7|12|8|@]|9|@]|A|$]]|$1|N|3|O|5|G|7|13|8|@$H|14|I|15|J|K]|$H|16|I|17|J|K]]|9|@]|A|$]]|$1|P|3|-4|5|6|7|18|8|@]|9|@]|A|$]]|$1|Q|3|R|5|6|7|19|8|@]|9|@]|A|$]]|$1|S|3|T|5|6|7|1A|8|@$H|1B|I|1C|J|K]]|9|@]|A|$]]|$1|U|3|-4|5|6|7|1D|8|@]|9|@]|A|$]]]|V|$]]

I've hacked something similar together to improve how JFreechart decides to paint when it makes lots of calls to repaint.

Essentially I do the following:

<ul>
<li>Create a <code>ScheduledExecutorService</code> as a field in the class</li>
<li>Receive first repaint request and and <code>submit</code> it to the executor to run on the EDT in say 50ms getting back the future</li>
<li>Receive second request - test to see if the previous repaint has finished (<code>fut.isDone()</code>) and if so to schedule the next repaint; otherwise do nothing.</li>
</ul>

This way you should get at most 20 repaint request per second.

I've done similar things for batching up the number of calls to <code>fireDataTableChanged</code> when lots of changes are occuring at the same time.

blocks|key|1499377|text|我听到你说的话了。实际上，您只能重画一部分区域。在Sun网站上的“执行自定义绘画示例”中，我发现了一个有用的示例，它展示了如何绘制一个拖动的矩形，然后仅在鼠标移动或松开时重新绘制该区域。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1499378|以下是代码的相关部分...|1499379|public+void+mouseDragged(MouseEvent+e)+{
++++++++++++updateSize(e);
++++++++}

++++++++public+void+mouseReleased(MouseEvent+e)+{
++++++++++++updateSize(e);
++++++++}

++++++++/*+
+++++++++*+Update+the+size+of+the+current+rectangle
+++++++++*+and+call+repaint.++Because+currentRect
+++++++++*+always+has+the+same+origin,+translate+it
+++++++++*+if+the+width+or+height+is+negative.
+++++++++*+
+++++++++*+For+efficiency+(though
+++++++++*+that+isn't+an+issue+for+this+program),
+++++++++*+specify+the+painting+region+using+arguments
+++++++++*+to+the+repaint()+call.
+++++++++*+
+++++++++*/
++++++++void+updateSize(MouseEvent+e)+{
++++++++++++int+x+=+e.getX();
++++++++++++int+y+=+e.getY();
++++++++++++currentRect.setSize(x+-+currentRect.x,
++++++++++++++++++++++++++++++++y+-+currentRect.y);
++++++++++++updateDrawableRect(getWidth(),+getHeight());
++++++++++++Rectangle+totalRepaint+=+rectToDraw.union(previousRectDrawn);
++++++++++++repaint(totalRepaint.x,+totalRepaint.y,
++++++++++++++++++++totalRepaint.width,+totalRepaint.height);
++++++++}|code-block|syntax|javascript|1499380|此代码受版权保护(请参阅here+for+full+code+and+copyright+notice)|offset|length|1499381|请参阅here+for+further+example+listings|1499382|说实话，我在FPS上也遇到了类似的问题，但这可能是因为我目前的代码很糟糕！在过去的几个月里，我学到了很多东西，现在我可以让我的代码更有效率了。希望我能克服FPS的问题，当超过2个“人”减慢我的图形！嗯..。我只为我的代码中的同一部分实现了上面的代码，而不是其他部分，但无论如何都要试一试！|1499383|entityMap|0|LINK|mutability|MUTABLE|url|http://java.sun.com/docs/books/tutorial/uiswing/examples/painting/SelectionDemoProject/src/painting/SelectionDemo.java|1|http://java.sun.com/docs/books/tutorial/uiswing/examples/painting/index.html^0|0|0|0|C|13|0|0|3|X|1|0|0^^$0|@$1|2|3|4|5|6|7|10|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|11|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|12|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|13|8|@]|9|@$K|14|L|15|1|16]]|A|$]]|$1|M|3|N|5|6|7|17|8|@]|9|@$K|18|L|19|1|1A]]|A|$]]|$1|O|3|P|5|6|7|1B|8|@]|9|@]|A|$]]|$1|Q|3|-4|5|6|7|1C|8|@]|9|@]|A|$]]]|R|$S|$5|T|U|V|A|$W|X]]|Y|$5|T|U|V|A|$W|Z]]]]

I hear what your saying.
You can indeed repaint only a section of area.
In the "Performing Custom Painting Examples" on the Sun website, I found a useful example which shows how to draw a dragged rectangle, and then only repaint that area when the mouse is moving or released.

Here is the relevant section of code...

<pre><code>public void mouseDragged(MouseEvent e) {
 updateSize(e);
 }

 public void mouseReleased(MouseEvent e) {
 updateSize(e);
 }

 /* 
 * Update the size of the current rectangle
 * and call repaint. Because currentRect
 * always has the same origin, translate it
 * if the width or height is negative.
 * 
 * For efficiency (though
 * that isn't an issue for this program),
 * specify the painting region using arguments
 * to the repaint() call.
 * 
 */
 void updateSize(MouseEvent e) {
 int x = e.getX();
 int y = e.getY();
 currentRect.setSize(x - currentRect.x,
 y - currentRect.y);
 updateDrawableRect(getWidth(), getHeight());
 Rectangle totalRepaint = rectToDraw.union(previousRectDrawn);
 repaint(totalRepaint.x, totalRepaint.y,
 totalRepaint.width, totalRepaint.height);
 }
</code></pre>

This code is subject to copyright (see <a href="http://java.sun.com/docs/books/tutorial/uiswing/examples/painting/SelectionDemoProject/src/painting/SelectionDemo.java" rel="nofollow noreferrer">here for full code and copyright notice</a>)

See <a href="http://java.sun.com/docs/books/tutorial/uiswing/examples/painting/index.html" rel="nofollow noreferrer">here for further example listings</a>

Truth be told, I'm having a similar issue on FPS, but that may be due to my currently poor code! I've learnt so much over the past few months, that I can now make my code so more efficient. Hopefully I can overcome the FPS issue when more than 2 "people" slow down my graphics! Hummmm...
I have only implemented the above code for the same section in my code, and not others, but by all means give it a try!

I am calling repaint a bunch of times from a listeners, but the way I designed my paint function is only one repaint is required. I generate a bunch of repaints, since it hooked into my mouse motion listener.

Is there a way to cancel all pending repaints for a certain component? I can't just start ignoring repaints, since some are valid like when you resize the frame or restore it from minimize.

Why do I care? Because my paint code is very heavy and I can't do full repaints at a very high FPS.

How to combine repaints in Swing?

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我从一个侦听器调用了一堆重绘，但是我设计我的画图函数的方式只需要一个重绘。我生成了一堆重绘，因为它挂到了我的鼠标运动监听器中。有没有办法取消某个组件的所有挂起的重绘？我不能忽略重绘，因为有些是有效的，比如当你调整框架大小或从最小化恢复它时。我为什么要关心呢？因为我的绘制代码很重，而且我不能在非常高的FPS下进行完整的重绘。

问如何在Swing中组合重绘？
EN

回答 5

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