blocks|key|3140645|text|下载FarseerPhysics引擎，看看它是如何工作的，我认为这是http://www.codeplex.com/FarseerPhysics最好的东西！|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|3140646|entityMap|0|LINK|mutability|MUTABLE|url|http://www.codeplex.com/FarseerPhysics^0|Y|12|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]]]]

Download the FarseerPhysics engine, have a look at how it works <a href="http://www.codeplex.com/FarseerPhysics" rel="nofollow noreferrer">http://www.codeplex.com/FarseerPhysics</a> I think it's the best thing available for XNA/Silverlight!

blocks|key|354363|text|重力很简单：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|354364|const+gravity+=+...+;+//+pixels+per+timestep+(eg.+video+frame)+squared
//+while+in+freefall,+each+timestep:
y_velocity+%2B=+gravity;
y_pos+%2B=+y_velocity;|code-block|syntax|javascript|354365|请注意，我玩过的大多数2d平台游戏都没有真实的重力。做任何能让游戏变得有趣的事情！|354366|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

Gravity is easy:

<pre><code>const gravity = ... ; // pixels per timestep (eg. video frame) squared
// while in freefall, each timestep:
y_velocity += gravity;
y_pos += y_velocity;
</code></pre>

Mind you, most 2d platform games I've played don't have realistic gravity. Just do whatever makes the game fun!

blocks|key|356513|text|jnrdev可能会有所帮助。它涵盖了瓷砖碰撞/响应和坡度。这不是我见过的最好的代码，但它完成了工作。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|356514|entityMap|0|LINK|mutability|MUTABLE|url|http://jnrdev.72dpiarmy.com/^0|0|6|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]]]]

<a href="http://jnrdev.72dpiarmy.com/" rel="nofollow noreferrer">jnrdev</a> might be of some assistance. It covers tile collision/response and slopes. It's not the best code I have ever seen, but it gets the job done.

blocks|key|3140726|text|在http://www.metanetsoftware.com/technique/tutorialA.html和http://www.metanetsoftware.com/technique/tutorialB.html上有几个非常有用的2-d平台教程。我想他们已经被其他地方的人引用过了。它们涵盖了碰撞检测和响应，光线投射，各种优化技术等，并为那些不太喜欢数学的人(比如我)很好地解释了背后的理论。它没有像刚体动力学这样的东西走得那么远，但我认为对于你正在编写的游戏类型来说，你不需要它(尽管如果你添加了这种东西，当然会很酷……)|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|3140727|entityMap|0|LINK|mutability|MUTABLE|url|http://www.metanetsoftware.com/technique/tutorialA.html|1|http://www.metanetsoftware.com/technique/tutorialB.html^0|1|1J|0|1L|1J|1|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@$A|O|B|P|1|Q]|$A|R|B|S|1|T]]|C|$]]|$1|D|3|-4|5|6|7|U|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]|L|$5|G|H|I|C|$J|M]]]]

There are a couple of really useful 2-d platformer tutorials at <a href="http://www.metanetsoftware.com/technique/tutorialA.html" rel="nofollow noreferrer">http://www.metanetsoftware.com/technique/tutorialA.html</a> and <a href="http://www.metanetsoftware.com/technique/tutorialB.html" rel="nofollow noreferrer">http://www.metanetsoftware.com/technique/tutorialB.html</a>. I think they've been referenced by others elsewhere on SO. They cover collision detection and response, raycasting, various optimisation techniques etc. and have a good explanation of the theory behind it all for those (like me) who are less mathematically inclined. It doesn't go as far as stuff like rigid body dynamics, but I don't think you'd need that for the type of game you are writing (though it would of course be cool if you added this sort of stuff...)

blocks|key|3353518|text|这可能是一个弯路，但可以尝试XNA+3.0的Platformer初学者工具包，其中包含物理和基本碰撞检测等内容。您需要更改一些东西才能使其在XNA之外工作，但这不是火箭科学。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3353519|XNAGS+3.0+download|offset|length|3353520|entityMap|0|LINK|mutability|MUTABLE|url|http://www.microsoft.com/downloads/details.aspx?FamilyId=7D70D6ED-1EDD-4852-9883-9A33C0AD8FEE&displaylang=en^0|0|0|I|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|O|8|@]|9|@$D|P|E|Q|1|R]]|A|$]]|$1|F|3|-4|5|6|7|S|8|@]|9|@]|A|$]]]|G|$H|$5|I|J|K|A|$L|M]]]]

That may be a detour, but try the Platformer starter kit from XNA 3.0, that contains stuff like Physics and basic Collision detection. You will need to change stuff to make it work outside of XNA, but it's not rocket science.

<a href="http://www.microsoft.com/downloads/details.aspx?FamilyId=7D70D6ED-1EDD-4852-9883-9A33C0AD8FEE&amp;displaylang=en" rel="nofollow noreferrer">XNAGS 3.0 download</a>

blocks|key|3353581|text|我不知道您使用的物理模型是什么，但是使用fluid+drag的物理模型最近在another+SO+question中得到了解决。我不会重复我在回答中给出的所有内容，我只会使用link+to+it。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|3353582|总而言之，该问题的OP希望将对象从静止状态加速到最大速度。对于两种不同类型的阻力，我进行了一些推导，以将速度建模为时间的函数。您的情况可能略有不同，因此使用的积分可能具有不同的形式，或者需要使用不同的初始条件来求解，但希望我的答案将为您指明一些有用的方向。|3353583|entityMap|0|LINK|mutability|MUTABLE|url|http://en.wikipedia.org/wiki/Air_resistance|1|https://stackoverflow.com/questions/667034/simple-physics-based-movement|2|https://stackoverflow.com/questions/667034/simple-physics-based-movement/667090#667090^0|K|A|0|12|J|1|2F|A|2|0|0^^$0|@$1|2|3|4|5|6|7|R|8|@]|9|@$A|S|B|T|1|U]|$A|V|B|W|1|X]|$A|Y|B|Z|1|10]]|C|$]]|$1|D|3|E|5|6|7|11|8|@]|9|@]|C|$]]|$1|F|3|-4|5|6|7|12|8|@]|9|@]|C|$]]]|G|$H|$5|I|J|K|C|$L|M]]|N|$5|I|J|K|C|$L|O]]|P|$5|I|J|K|C|$L|Q]]]]

I don't know what you're using for a physics model, but physics models that use <a href="http://en.wikipedia.org/wiki/Air_resistance" rel="nofollow noreferrer">fluid drag</a> were recently addressed in <a href="https://stackoverflow.com/questions/667034/simple-physics-based-movement">another SO question</a>. I won't repeat everything that I gave in my answer, I'll just <a href="https://stackoverflow.com/questions/667034/simple-physics-based-movement/667090#667090">link to it</a>.

To summarize, the OP for the question wanted to accelerate an object from rest to a maximum velocity. I went through a few derivations for modeling velocity as a function of time for two different types of drag. Your situation may be slightly different, so the integrals used may have different forms or need to be solved with different initial conditions, but hopefully my answer will point you in some informative directions.

blocks|key|3140738|text|你的多个块被碰撞的bug，你可以通过只碰撞与playersprite对齐最多的块或者偏移最少的块来修复它。一定不要把它限制在一个方向上。在Mario中，块实际上可以从任何方向颠簸。(上面通过在相同的游戏中做一个地面打击，或者是钻旋转的东西)(通过使用一个外壳)|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3140739|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|$]]

Your bug with the multiple blocks being bumped, you could fix that by only bumping the block that is most aligned with the playersprite, or has the least offset. Be sure not to limit it to just one direction. Blocks can actually be bumped from any direction in Mario. (Above by doing a ground pound in same games, or the drill-spin-thing) (Sides by using a shell)

blocks|key|3140741|text|++++UIGraphicsBeginImageContext(images.size);
++++CGContextRef+context+=+UIGraphicsGetCurrentContext();
++++UIColor+*color+=+[UIColor+whiteColor];
++++[color+setFill];

++++CGContextTranslateCTM(context,+1,+images.size.height);
++++CGContextScaleCTM(context,+1.0,+-1.0);
++++CGContextSetBlendMode(context,+kCGBlendModeDestinationOver);
++++CGRect+rect+=+CGRectMake(0.0,+0.0,+images.size.width,+images.size.height);
++++CGContextDrawImage(context,+rect,+images.CGImage);
++++CGContextClipToMask(context,+rect,+images.CGImage);
++++CGContextAddRect(context,+rect);
++++CGContextDrawPath(context,+kCGPathFill);
++++images+=+UIGraphicsGetImageFromCurrentImageContext();
++++UIGraphicsEndImageContext();|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|3140742|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code> UIGraphicsBeginImageContext(images.size);
 CGContextRef context = UIGraphicsGetCurrentContext();
 UIColor *color = [UIColor whiteColor];
 [color setFill];

 CGContextTranslateCTM(context, 1, images.size.height);
 CGContextScaleCTM(context, 1.0, -1.0);
 CGContextSetBlendMode(context, kCGBlendModeDestinationOver);
 CGRect rect = CGRectMake(0.0, 0.0, images.size.width, images.size.height);
 CGContextDrawImage(context, rect, images.CGImage);
 CGContextClipToMask(context, rect, images.CGImage);
 CGContextAddRect(context, rect);
 CGContextDrawPath(context, kCGPathFill);
 images = UIGraphicsGetImageFromCurrentImageContext();
 UIGraphicsEndImageContext();
</code></pre>

blocks|key|354368|text|听说过GameMaker吗？|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|354369|entityMap|0|LINK|mutability|MUTABLE|url|http://gamemaker.nl/^0|3|9|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]]]]

Ever heard of <a href="http://gamemaker.nl" rel="nofollow noreferrer">GameMaker</a>?

It was a long holiday weekend, so I got the coding bug again and started playing around:

<a href="http://gfilter.net/junk/tileengine.jpg" rel="nofollow noreferrer">Mario http://gfilter.net/junk/tileengine.jpg</a>

I wrote a basic tile engine, but having never attempted this before, I am really struggling with handling sprite collision detection and implementing realistic physics for gravity.

For any other game hobby writers, can you point me towards some walkthroughs on the best way to approach this?

Update:

I thought I'd share a progress report:

<a href="http://www.youtube.com/watch?v=-RKNQ2UiiLY" rel="nofollow noreferrer">http://www.youtube.com/watch?v=-RKNQ2UiiLY</a> &lt;-- Game in Action

Its still really buggy, but collision detection is mostly working, I've started working on some other features (such as bumping the blocks (notice the bug) and interacting with the enemies).

Mario still walks like he is on the moon, I'm using these constants, any advice for tweaking them for more realism?

<pre><code> const float AirDrag = 1.00f;
 const float GroundFriction = .97f;
 const float Gravity = 0.8f;
</code></pre>

2d Platformer physics

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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这是一个漫长的假期周末，所以我又有了编码错误，并开始玩弄：我写了一个基本的瓦片引擎，但我以前从未尝试过，我真的很难处理精灵碰撞检测和实现重力的真实物理。对于任何其他游戏爱好作者，你能给我一些最好的方法的演练吗？更新：我想我应该分享一份进度报告： <--行动中的游戏它仍然有很多bug，但是碰撞检测基本上是有效的，我已经开始开发一些其他的功能(比如碰撞积木(注意bug)和与敌人交互)。马里奥仍然像在月

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