blocks|key|4645323|text|我会先通读一下Performing+Custom+Painting和Painting+in+AWT+and+Swing|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|4645324|repaint向RepaintManager发出请求以绘制部分或全部组件。RepaintManager将决定绘制什么以及绘制多少，可能会将重新绘制请求合并到尽可能少的更新中(因此重复调用repaint实际上可能会减慢绘制进程)。|style|CODE|4645325|然后，RepaintManager将paint事件推送到事件分派线程上。这确保了在EDT上下文中处理paint事件。|4645326|在Swing中进行绘制时，有许多可能的解决方案可以提高速度和资源管理。|4645327|您可以考虑实现您自己的双缓冲策略，将您的更新绘制到离屏缓冲区，并在准备好后切换到活动缓冲区，该缓冲区将被绘制。|4645328|这意味着绘制很快，因为所有的工作都已经完成了(假设是在后台线程中)。|4645329|举个例子。|4645330|4645331|Swing+animation+running+extremely+slow|unordered-list-item|4645332|the+images+are+not+loading|4645333|How+to+make+line+animation+smoother?|4645334|Java+Bouncing+Ball|4645335|4645336|你也可以看看Passive+vs.+Active+Rendering，但我很确定你知道自己在做什么……|4645337|entityMap|0|LINK|mutability|MUTABLE|url|http://docs.oracle.com/javase/tutorial/uiswing/painting/|1|http://www.oracle.com/technetwork/java/painting-140037.html|2|https://stackoverflow.com/questions/14886232/swing-animation-running-extremely-slow/14902184#14902184|3|https://stackoverflow.com/questions/12642852/the-images-are-not-loading/12648265#12648265|4|https://stackoverflow.com/questions/13540534/how-to-make-line-animation-smoother/13547895#13547895|5|https://stackoverflow.com/questions/13022754/java-bouncing-ball/13022788#13022788|6|http://docs.oracle.com/javase/tutorial/extra/fullscreen/rendering.html^0|7|Q|0|Y|P|1|0|0|7|8|E|11|E|2L|7|0|3|E|I|5|0|0|0|0|0|0|0|12|2|0|0|Q|3|0|0|10|4|0|0|I|5|0|0|6|S|6|0^^$0|@$1|2|3|4|5|6|7|1O|8|@]|9|@$A|1P|B|1Q|1|1R]|$A|1S|B|1T|1|1U]]|C|$]]|$1|D|3|E|5|6|7|1V|8|@$A|1W|B|1X|F|G]|$A|1Y|B|1Z|F|G]|$A|20|B|21|F|G]|$A|22|B|23|F|G]]|9|@]|C|$]]|$1|H|3|I|5|6|7|24|8|@$A|25|B|26|F|G]|$A|27|B|28|F|G]]|9|@]|C|$]]|$1|J|3|K|5|6|7|29|8|@]|9|@]|C|$]]|$1|L|3|M|5|6|7|2A|8|@]|9|@]|C|$]]|$1|N|3|O|5|6|7|2B|8|@]|9|@]|C|$]]|$1|P|3|Q|5|6|7|2C|8|@]|9|@]|C|$]]|$1|R|3|-4|5|6|7|2D|8|@]|9|@]|C|$]]|$1|S|3|T|5|U|7|2E|8|@]|9|@$A|2F|B|2G|1|2H]]|C|$]]|$1|V|3|W|5|U|7|2I|8|@]|9|@$A|2J|B|2K|1|2L]]|C|$]]|$1|X|3|Y|5|U|7|2M|8|@]|9|@$A|2N|B|2O|1|2P]]|C|$]]|$1|Z|3|10|5|U|7|2Q|8|@]|9|@$A|2R|B|2S|1|2T]]|C|$]]|$1|11|3|-4|5|6|7|2U|8|@]|9|@]|C|$]]|$1|12|3|13|5|6|7|2V|8|@]|9|@$A|2W|B|2X|1|2Y]]|C|$]]|$1|14|3|-4|5|6|7|2Z|8|@]|9|@]|C|$]]]|15|$16|$5|17|18|19|C|$1A|1B]]|1C|$5|17|18|19|C|$1A|1D]]|1E|$5|17|18|19|C|$1A|1F]]|1G|$5|17|18|19|C|$1A|1H]]|1I|$5|17|18|19|C|$1A|1J]]|1K|$5|17|18|19|C|$1A|1L]]|1M|$5|17|18|19|C|$1A|1N]]]]

I would start by having a read through <a href="http://docs.oracle.com/javase/tutorial/uiswing/painting/" rel="nofollow noreferrer">Performing Custom Painting</a> and <a href="http://www.oracle.com/technetwork/java/painting-140037.html" rel="nofollow noreferrer">Painting in AWT and Swing</a>

<code>repaint</code> makes a request to the <code>RepaintManager</code> to paint part or all of a component. The <code>RepaintManager</code> will decide what and how much will be painted, possible consolidating repaint requests into as small a number of updates as possible (so repeatedly calling <code>repaint</code> could actually slow your paint process).

The <code>RepaintManager</code> then pushes a <code>paint</code> event onto the Event Dispatching Thread. This ensures that the paint event is handle within the context of the EDT.

There are many possible solutions for improving speed and resource management when it comes to painting in Swing.

You could consider implementing your own double buffering strategy, painting your updates to an off screen buffer and when ready, switching to the active buffer, which will get painted.

This means that the paint is quick as all the work has already being done (presumably in a background thread).

For examples...

<ul>
<li><a href="https://stackoverflow.com/questions/14886232/swing-animation-running-extremely-slow/14902184#14902184">Swing animation running extremely slow</a></li>
<li><a href="https://stackoverflow.com/questions/12642852/the-images-are-not-loading/12648265#12648265">the images are not loading</a></li>
<li><a href="https://stackoverflow.com/questions/13540534/how-to-make-line-animation-smoother/13547895#13547895">How to make line animation smoother?</a></li>
<li><a href="https://stackoverflow.com/questions/13022754/java-bouncing-ball/13022788#13022788">Java Bouncing Ball</a></li>
</ul>

You could also take a look at <a href="http://docs.oracle.com/javase/tutorial/extra/fullscreen/rendering.html" rel="nofollow noreferrer">Passive vs. Active Rendering</a>, but I'd be very sure that you know what you're getting yourself in for...

I've just started working with java 2d graphics applications, on my studies repaint is redrawing our graphics wasting a lot of resources.
but I want to know what repaint is, does and how to use it efficiently, thread safely and fast for many movable dynamic objects on my canvas?

how java graphics repaint method actually works

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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