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• Cocos2d Tiled Dynamic Object Layer

  - by Rodrigo Camargo

  I'm trying to develop a cocos2d tiled based game using a sort of 'dynamic' object layer. What I want to do is after the tiled map is loaded, the user can drag something into the map and that will become an event when the 'hero' pass over it. I know how to build an object layer in tiled but it seems that is for fixed positions and what I want is a dynamic action position based on what the user can select. For instance, the user can drag a rock into a tile and when the character hit that rock he may die, or something. I'm a little lost about how to make it work. Do you have any idea of what should I use or what should I look for? Thanks in advance!

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• How do we know to favour composition over generalisation is always the right choice?

  - by Carnotaurus

  Whether an object physically exists or not, we can choose to model it in different ways. We could arbitarily use generalisation or composition in many cases. However, the GoF principle of "favour composition over generalisation [sic]" guides us to use composition. So, when we model, for example, a line then we create a class that contains two members PointA and PointB of the type Point (composition) instead of extending Point (generalisation). This is just a simplified example of how we can arbitarily choose composition or inheritance to model, despite that objects are usually much more complex. How do we know that this is the right choice? It matters at least because there could be a ton of refactoring to do if it is wrong?

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• Sorting out mSSD acceleration on a Acer M3-581TG

  - by PhonicUK

  I recently purchased a Acer Timeline M3 Ultra, it ships with a 500GB HDD and a 20GB mSSD to use as a cache. First thing I did when I got it was format the drives and install a clean OS (on the HDD, the mSSD has nothing on it) - but now I can't figure out how everything needs to be configured in order to use the mSSD as a cache, it just looks like a standard storage drive. I've poked around in the BIOS and there is a SATA mode setting, but it only has one option (AHCI), most of the documentation I've seen on the subject says that the SATA controller needs to be in RAID mode otherwise 'Acceleration' isn't visible in the Intel SRT menu (which for me, it isn't) I've seen a few things that suggest I just need the correct partition layout, I tried this using fdisk from a Linux LiveCD but got nowhere. Any ideas? The laptop shipped with no recovery media so I'm marginally stumped. I don't have any issue with reformatting again if required.

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• APC and "apc.gc_ttl" :: How Low is Too Low?

  - by nojak

  I currently have my apc.gc_ttl set to 600 to help keep fragmentation down. Since apc.gc_ttl just sets the time on cache for garbage collection, I don't see any harm in keeping it this low. However, I'm new to APC, and have seen many configurations online that use a 3600 TTL, which seems quite long to me for garbage collection cache... Is 600 too low? Is 3600 too high? As I'm sure mileage varies on this setup, is there a good rule of thumb to follow?

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• Do delegates defy OOP

  - by Dave Rook

  I'm trying to understand OOP so I can write better OOP code and one thing which keeps coming up is this concept of a delegate (using .NET). I could have an object, which is totally self contained (encapsulated); it knows nothing of the outside world... but then I attach a delegate to it. In my head, this is still quite well separated as the delegate only knows what to reference, but this by itself means it has to know about something else outside it's world! That a method exists within another class! Have I got myself it total muddle here, or is this a grey area, or is this actually down to interpretation (and if so, sorry as that will be off topic I'm sure). My question is, do delegates defy/muddy the OOP pattern?

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• Collision in PyGame for spinning rectangular object.touching circles

  - by OverAchiever

  I'm creating a variation of Pong. One of the differences is that I use a rectangular structure as the object which is being bounced around, and I use circles as paddles. So far, all the collision handling I've worked with was using simple math (I wasn't using the collision "feature" in PyGame). The game is contained within a 2-dimensional continuous space. The idea is that the rectangular structure will spin at different speed depending on how far from the center you touch it with the circle. Also, any extremity of the rectangular structure should be able to touch any extremity of the circle. So I need to keep track of where it has been touched on both the circle and the rectangle to figure out the direction it will be bounced to. I intend to have basically 8 possible directions (Up, down, left, right and the half points between each one of those). I can work out the calculation of how the objected will be dislocated once I get the direction it will be dislocated to based on where it has been touch. I also need to keep track of where it has been touched to decide if the rectangular structure will spin clockwise or counter-clockwise after it collided. Before I started coding, I read the resources available at the PyGame website on the collision class they have (And its respective functions). I tried to work out the logic of what I was trying to achieve based on those resources and how the game will function. The only thing I could figure out that I could do was to make each one of these objects as a group of rectangular objects, and depending on which rectangle was touched the other would behave accordingly and give the illusion it is a single object. However, not only I don't know if this will work, but I also don't know if it is gonna look convincing based on how PyGame redraws the objects. Is there a way I can use PyGame to handle these collision detections by still having a single object? Can I figure out the point of collision on both objects using functions within PyGame precisely enough to achieve what I'm looking for? P.s: I hope the question was specific and clear enough. I apologize if there were any grammar mistakes, English is not my native language.

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• Best Practices for serializing/persisting String Object Dictionary entities

  - by Mark Heath

  I'm noticing a trend towards using a dictionary of string to object (or sometimes string to string), instead of strongly typed objects. For example, the new Katana project makes heavy use of IDictionary<string,object>. This approach avoids the need to continually update your entity classes/DTOs and the database tables that persist them with new properties. It also avoids the need to create new derived entity types to support new types of entity, since the Dictionary is flexible enough to store any arbitrary properties. Here's a contrived example: class StorageDevice { public int Id { get; set; } public string Name { get; set; } } class NetworkShare : StorageDevice { public string Path { get; set; } public string LoginName { get; set; } public string Password { get; set; } } class CloudStorage : StorageDevice { public string ServerUri { get; set } public string ContainerName { get; set; } public int PortNumber { get; set; } public Guid ApiKey { get; set; } } versus: class StorageDevice { public IDictionary<string, object> Properties { get; set; } } Basically I'm on the lookout for any talks, books or articles on this approach, so I can pick up on any best practices / difficulties to avoid. Here's my main questions: Does this approach have a name? (only thing I've heard used so far is "self-describing objects") What are the best practices for persisting these dictionaries into a relational database? Especially the challenges of deserializing them successfully with strongly typed languages like C#. Does it change anything if some of the objects in the dictionary are themselves lists of strongly typed entities? Should a second dictionary be used if you want to temporarily store objects that are not to be persisted/serialized across a network, or should you use some kind of namespacing on the keys to indicate this?

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• Windows 7: How to prevent Windows from caching my desktop wallpaper

  - by rmartz

  I have a service running that renders a changing wallpaper every 5 minutes or so, and replaces the current image file with the new one automatically (That is to say, new image but same filename). On Linux, the change is detected almost automatically, and so I have the most current wallpaper. However, on my Windows 7 machine (Which syncs the image with my Linux machine over Dropbox), it appears to cache the wallpaper from the last time I manually set the wallpaper. The image never changes, even if I restart. Is there a way to make Windows detect the file change, or periodically refresh the wallpaper cache? I'd like to avoid third-party apps if at all possible.

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• How get and set accessors work

  - by Chris Halcrow

  The standard method of implementing get and set accessors in C# and VB.NET is to use a public property to set and retrieve the value of a corresponding private variable. Am I right in saying that this has no effect of different instances of a variable? By this I mean, if there are different instantiations of an object, then those instances and their properties are completely independent right? So I think my understanding is correct that setting a private variable is just a construct to be able to implement the get and set pattern? Never been 100% sure about this.

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• MySQL com_select?

  - by symcbean

  I'm looking to tune my query cache a bit. According to 7.6.3.4. Query Cache Status and Maintenance in the manual: The Com_select value is given by this formula: Qcache_inserts + Qcache_not_cached + queries with errors found during the column-privileges check However in 5.1.5. Server Status Variables it suggests that this is maintained by the DBMS. Having said that mysql> show status like 'Com_select%'; Always returns a value of 1 - and I'm pretty sure I've run more than one non-cached select query on my database since it started. It looks as if other people are similarly confused. Is this status variable redundant? Which bit of the manual is wrong? TIA

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• Evaluating an Object's PropertyPath

  This workaround provides a way to evaluate the PropertyPath value of an object, even if it's not bound to a data consumer.

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• Read ahead buffering while playing video file from optical disc

  - by Saxtus

  I was wondering if there is a program for Windows 7 (64-bit), that reads ahead the file to be played back (usually MKV files in my case) to the RAM, so the disc that the video file resides in, won't spin for the entire duration of the playback, but only every time the cache is almost empty (with big enough cache so it won't need the drive for long periods). A program that I've used in the past (called DVDIdle), was doing that universally for every video player I wanted, but they've stopped updating it 6 years ago and now it doesn't seem to work with Windows 7 (tried using compatibility mode too). The method I am using now, is to either have the drive wearing down and buzzing all the time or manually copy the entire file to HDD, SSD or RamDisk and play it from there. The closest thing I've found, is a software that slows down the drive's spin speed, but I was looking for something more convenient, automated, without waiting for an entire file to be copied before starting playback or needing any HDD space, like I've used to in the past. Thanks in advance.

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• Rotation, further I go from 0:0, the further the object positions around the origin while rotating

  - by Serguei Fedorov

  For some reason I am having the issue where the following code: global.spriteBatch.Draw(obj.sprite, obj.getPosition(), null, Color.White, obj.rotation, obj.center, 2f, SpriteEffects.None, 1); causes the object to rotate around the origin in such a way, as though there is an offset to the position relative to its location. The calculation for the center it correct and this happens even if I set the pivot to be the location of the object. The further I get from 0:0 the larger the radius or rotation. I am not sure what is going on here because given the following tutorial http://www.riemers.net/eng/Tutorials/XNA/Csharp/Series2D/Rotation.php I have done the code setup correctly. Any ideas? Any help is greatly appreciated!!!

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• How to Create a Skin Object from an OWS Configuration - 2 Videos

  In this video tutorial we walk you through how to create and place Open Web Studio skin objects directly into your DotNetNuke skin.We cover how to create an OWS menu and feedback form and how to convert those modules into DNN Skin Objects.The videos contain:Video 1 - Building the New OWS Configuration and Creating the Menu SystemVideo 2 - Placing the OWS Skin Object within the Skin File and Creating a Feedback Skin ObjectHow to Create a Skin Object from an OWS Configuration - 2 Videos Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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• Cocos2d Box2d contact listener call different method in collided object

  - by roma86

  I have the building object, wen it hit with other, i want to call some method inside it. Building.mm -(void)printTest { NSLog(@"printTest method work correctly"); } in my ContactListener i trying to call it so: ContactListener.mm #import "ContactListener.h" #import "Building.h" void ContactListener::BeginContact(b2Contact* contact) { b2Body* bodyA = contact->GetFixtureA()->GetBody(); b2Body* bodyB = contact->GetFixtureB()->GetBody(); Building *buildA = (Building *)bodyA->GetUserData(); Building *buildB = (Building *)bodyB->GetUserData(); if (buildB.tag == 1) { NSLog(@"tag == 1"); } if (buildA.tag == 2) { NSLog(@"tag == 2"); [buildA printTest]; } } NSLog(@"tag == 2"); work correctly, but [buildA printTest]; get error Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[CCSprite printTest]: unrecognized selector sent to instance 0x18595f0' Obviously I'm referring to the wrong object. How i can get different method and property in contacted objects from contactlistener class? Thanks.

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• How to move an object along a circumference of another object?

  - by Lumis

  I am so out of math that it hurts, but for some of you this should be a piece of cake. I want to move an object around another along its ages or circumference on a simple circular path. At the moment my game algorithm knows how to move and position a sprite just at the edge of an obstacle and now it waits for the next point to move depending on various conditions. So the mathematical problem here is how to get (aX, aY) and (bX, bY) positions, when I know the Centre (cX, cY), the object position (oX, oY) and the distance required to move (d)

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• Is OOP becoming easier or harder?

  - by tunmise fasipe

  When the concepts of Object Oriented Programming were introduced to programmers years back it looks interesting and programming was cleaner. OOP was like this Stock stock = new Stock(); stock.addItem(item); stock.removeItem(item); That was easier to understand with self-descriptive name. But now OOP, with pattern like Data Transfer Objects (or Value Objects), Repository, Dependency Injection etc, has become more complex. To achieve the above you may have to create several classes (e.g. abstract, factory, DAO etc) and Implement several interfaces Note: I am not against best practices that makes Collaboration, Testing and Integration easier

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• Getting started with object detection - Image segmentation algorithm

  - by Dev Kanchen

  Just getting started on a hobby object-detection project. My aim is to understand the underlying algorithms and to this end the overall accuracy of the results is (currently) more important than actual run-time. I'm starting with trying to find a good image segmentation algorithm that provide a good jump-off point for the object detection phase. The target images would be "real-world" scenes. I found two techniques which mirrored my thoughts on how to go about this: Graph-based Image Segmentation: http://www.cs.cornell.edu/~dph/papers/seg-ijcv.pdf Contour and Texture Analysis for Image Segmentation: http://www.eng.utah.edu/~bresee/compvision/files/MalikBLS.pdf The first one was really intuitive to understand and seems simple enough to implement, while the second was closer to my initial thoughts on how to go about this (combine color/intensity and texture information to find regions). But it's an order of magnitude more complex (at least for me). My question is - are there any other algorithms I should be looking at that provide the kind of results that these two, specific papers have arrived at. Are there updated versions of these techniques already floating around. Like I mentioned earlier, the goal is relative accuracy of image segmentation (with an eventual aim to achieve a degree of accuracy of object detection) over runtime, with the algorithm being able to segment an image into "naturally" or perceptually important components, as these two algorithms do (each to varying extents). Thanks! P.S.1: I found these two papers after a couple of days of refining my search terms and learning new ones relevant to the exact kind of techniques I was looking for. :) I have just about reached the end of my personal Google creativity, which is why I am finally here! Thanks for the help. P.S.2: I couldn't find good tags for this question. If some relevant ones exist, @mods please add them. P.S.3: I do not know if this is a better fit for cstheory.stackexchange (or even cs.stackexchange). I looked but cstheory seems more appropriate for intricate algorithmic discussions than a broad question like this. Also, I couldn't find any relevant tags there either! But please do move if appropriate.

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• How to Create a DotNetNuke Skin Object from an OWS Configuration - 2 Videos

  In this tutorial we walk you through how to create and place Open Web Studio skin objects directly into your DotNetNuke skin. We cover how to create an OWS menu and feedback form and how to convert those modules into DNN Skin Objects. The videos contain: Video 1 - Building the New OWS Configuration and Creating the Menu System Video 2 - Placing the OWS Skin Object within the Skin File and Creating a Feedback Skin Object Total Time Length: 18minsDid you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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• Remote Object Lifetime in .NET

  In this article I will explain you about Remote Object Lifetime.

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• HP p410i array controller - what happens if i add memory?

  - by James

  I have a p410i array controller that only has 256ram. We want to create a raid 5 so we have procured a 512 write back cache module. If we install the write back cache, will this erase the existing raid information. The server currently has 2 disks in raid 1. 6 are spare waiting for an upgrade to create a raid 5. the concern is if we replace/upgrade the memory for the controller, we will wipe the existing production raid 1 array. Thanks in advance.

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• Read a Sharepoint List using Object Model

  In this article we will see how to read from a sharepoint list using sharepoint object model.

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• Linux 3.10 améliore la mise en cache pour les SSD et offre de meilleures performances pour le CPU et le GPU, la version stable disponible

  Linux 3.10 améliore la mise en cache pour les SSD et offre de meilleures performances pour le CPU et le GPU, la version stable disponibleComme il est de coutume, Linus Torvalds a annoncé la publication de la version stable du noyau Linux 3.10.Cette nouvelle mouture, qui sort pratiquement deux mois après son prédécesseur, se distingue essentiellement par une meilleure prise en charge des disques SSD, le support de Radeon et des améliorations pour le CPU et GPU.Développée pendant plus d'un an, la technologie de mise en cache SSD « block layer cache » (Bcache) a été intégrée à Linux 3.10. Cette fonctionnalité peut être utilisée pour configurer un disque comme mémoire cache pour un autre disque pl...

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• Get and set accessors do they protect different instances of a variable?

  - by Chris Halcrow

  The standard method of implementing get and set accessors in C# and VB.NET is to use a public property to set and retrieve the value of a corresponding private variable. Am I right in saying that this has no effect of different instances of a variable? By this I mean, if there are different instantiations of an object, then those instances and their properties are completely independent right? So I think my understanding is correct that setting a private variable is just a construct to be able to implement the get and set pattern? Never been 100% sure about this.

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• What makes C so popular in the age of OOP?

  - by GradGuy

  I code a lot both in C and C++ but did not expect C to be the second popular language, slightly behind Java! http://www.tiobe.com/index.php/content/paperinfo/tpci/index.html I'm curious as why, in this age of OOP, C is still all that popular? Note that 4 out of top 5 popular languages are all "modern" object-oriented capable languages. Now I agree that you can do OOP in C to some extend, but that's sort of painful and not quite elegant! (well at least compared to C++ I guess) So what makes C this popular? efficiency? being low-level? or the vast majority of libraries that already exist? ... or something else?

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