collision

Efficient (and well explained) implementation of a Quadtree for 2D collision detection [closed]

由 血红的双手。 提交于 2019-11-26 11:52:52
问题 I\'ve been working on adding a Quadtree to a program that I\'m writing, and I can\'t help but notice that there are few well explained/performing tutorials for the implementation that I\'m looking for. Specifically, a list of the methods and pseudocode for how to implement them (or just a description of their processes) that are commonly used in a Quadtree (retrieve, insert, remove, etc.) is what I\'m looking for, along with maybe some tips to improve performance. This is for collision

Collisions when generating UUIDs in JavaScript?

由 痞子三分冷 提交于 2019-11-26 11:52:26
问题 This relates to this question. I am using the code below from this answer to generate UUID in JavaScript: \'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx\'.replace(/[xy]/g, function(c) { var r = Math.random()*16|0, v = c == \'x\' ? r : (r&0x3|0x8); return v.toString(16); }); This solution appeared to be working fine, but I am getting collisions. Here\'s what I have: A web-app running in Google Chrome. 16 users. about 4000 UUIDs have been generated in the past 2 months by these users. I got about 20

Please recommend a JQuery plugin that handles collision detection for draggable elements [closed]

由 ∥☆過路亽．° 提交于 2019-11-26 11:17:14
问题 Closed. This question is off-topic. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 5 years ago . We\'re using the Draggable JQuery UI plugin and need to disallow overlapping among our elements. We could write some collision detection ourselves but would prefer to use a tested package. Any suggestions? 回答1: You can try jquery-collision plus jquery-ui-draggable-collision. Full disclosure: I just wrote and

Modules and namespace / name collision in AngularJS

由 北战南征 提交于 2019-11-26 11:05:59
问题 Consider the following jfiddle http://jsfiddle.net/bchapman26/9uUBU/29/ //angular.js example for factory vs service var app = angular.module(\'myApp\', [\'module1\', \'module2\']); var service1module = angular.module(\'module1\', []); service1module.factory(\'myService\', function() { return { sayHello: function(text) { return \"Service1 says \\\"Hello \" + text + \"\\\"\"; }, sayGoodbye: function(text) { return \"Service1 says \\\"Goodbye \" + text + \"\\\"\"; } }; }); var service2module =

How to deal with symbol collisions between statically linked libraries?

由 人走茶凉 提交于 2019-11-26 10:12:48
One of the most important rules and best practices when writing a library, is putting all symbols of the library into a library specific namespace. C++ makes this easy, due to the namespace keyword. In C the usual approach is to prefix the identifiers with some library specific prefix. Rules of the C standard put some constraints on those (for safe compilation): A C compiler may look at only the first 8 characters of an identifier, so foobar2k_eggs and foobar2k_spam may be interpreted as the same identifiers validly – however every modern compiler allows for arbitrary long identifiers, so in

Quadtree for 2D collision detection

由 两盒软妹~` 提交于 2019-11-26 09:17:52
问题 I\'m trying to use a quadtree for 2D collision detection, but I\'m a little stumped on how to implement it. First of all, I\'d have a quadtree which contains four subtrees (one representing each quadrant), as well as a collection of objects which don\'t fit into a single subtree. When checking an object for collisions in the tree, I would do something like this (thanks to QuadTree for 2D collision detection): Check the object for collisions with any objects in the current node. For any

Probability of collision when using a 32 bit hash

由 China☆狼群 提交于 2019-11-26 09:16:41
问题 I have a 10 character string key field in a database. I\'ve used CRC32 to hash this field but I\'m worry about duplicates. Could somebody show me the probability of collision in this situation? p.s. my string field is unique in the database. If the number of string fields is 1 million, what is probability of collision ? 回答1: Duplicate of Expected collisions for perfect 32bit crc The answer referenced this article: http://arstechnica.com/civis/viewtopic.php?f=20&t=149670 Found the image below

pygame sprite wall collision

由 佐手、 提交于 2019-11-26 08:36:05
问题 I am working on a platform game in python and pygame. The entire code can be found at \"https://github.com/C-Kimber/FBLA_Game\". The issue I am having is with the collision between the player sprite and wall sprites, specifically the corners. When the player is pressing a x movement key and they jump, the player either does not move, or gets stuck. Here is the collision sample: def wallCollisions(self): block_hit_list = pygame.sprite.spritecollide(self, self.walls, False) for block in block

Pygame: Collision by Sides of Sprite

由 ￣綄美尐妖づ 提交于 2019-11-26 08:30:52
问题 Is there a way in pygame to look for a collision between the a particular side of a sprite and a particular side of another sprite in pygame? For example, if the top of sprite A collides with the bottom of Sprite B, return True. I am certain there is a way to do this, but I can\'t find any particular method in the documentation. Thanks! 回答1: There is no function to get sides collision in PyGame. But you could try to use pygame.Rect.collidepoint to test if A.rect.midleft , A.rect.midright , A

Is it safe to assume a GUID will always be unique?

由 坚强是说给别人听的谎言 提交于 2019-11-26 04:38:53
问题 I know there is a minute possibility of a clash but if I generated a batch of 1000 GUIDs (for example), would it be safe to assume they\'re all unique to save testing each one? Bonus question An optimal way to test a GUID for uniqueness? Bloom filter maybe? 回答1: Yes, you can. Since GUIDs are 128 bits long, there is admittedly a minute possibility of a clash—but the word "minute" is nowhere near strong enough. There are so many GUIDs that if you generate several trillion of them randomly, you
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