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  • How to implement physical effect, perspective effect on Android

    - by asedra_le
    I'm researching about 2D game for Android to implement an Android Game Project. My project looks nearly like PaperToss. Instance of throwing a page, my game will throw a coin. Suppose that I have a coin put in three-dimensional that have coordinates at A(x,y,z). I throw that point ahead, after 1/100 second, that coin move from A(x,y,z) to A'(x',y',z'). By this way, I have two problems need to solve. Determine the formulas can be used to compute the coordinates of the coin at time t. This problem is under-researching. I have no idea to solve this problem. Mapping three-dimensional points to a two-dimensional and use those new coordinates (a two-dimensional coordinates) to draw our coin on screen. I have found two solutions for this problem: Orthographic projection & Perspective projection However, my old friend said that OpenGL supports to solve problems like my problems. Any body have experiences about my problems? Help me please :) Thank for reading my question.

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  • install qutecom cannot find msg722.so file, how to solve the problem?

    - by weixi
    I build the qutecom-3.0 on ubuntu 11.04, during install process, It shows: CMake Error at /home/student/qutecom-3.0/build/qutecom/src/presentation/qt/cmake_install.cmake:122 (FILE): file INSTALL cannot find "/home/student/qutecom-3.0/build/bin/plugins/mediastreamer2/msg722.so". Call Stack (most recent call first): /home/student/qutecom-3.0/build/qutecom/src/cmake_install.cmake:37 (INCLUDE) /home/student/qutecom-3.0/build/qutecom/cmake_install.cmake:38 (INCLUDE) cmake_install.cmake:49 (INCLUDE) make: *** [install] Error 1

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  • When is the right time to join open source project for programmer?

    - by Mahesh
    Most of the newcomers in programming start with basic projects to start with programming. Most of the C++ progammers spend some time with puzzles and contests but this is not always helpful. Sometimes you've to spend some time on real projects. Starting your own open source project could be a problem in self-learning for newbie cause of lack of mentors and peers who can't look at your code and give suggestions. Open source projects can solve this problem, some projects could be best suited for new programmers. Besides everybody is newbie at some point. So i'll try and make this question a bit from beginners perspective. I tried few questions on stack overflow before asking this like How do i join & Bare minimum you need and how to get involved with open source and what level of programming etc. But this is not helping me when it comes to self-evaluating with skills. How to find that out ? How can i check what it takes to join open source project and am i really that comfortable with huge source code etc. My question is when to consider yourself comfortable joining open source programming ? I mean how will you test yourself that you're ready to take burden of big/small projects of open source ? how will you test yourself to see if you could work with version control/other programmers/tight schedule etc ?

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  • Farseer Physics: Ways to create a Body?

    - by EdgarT
    I want to create something similar to this using farsser and Kinect: https://vimeo.com/33500649 This is my implementation until now: http://www.youtube.com/watch?v=GlIvJRhco4U I have the outline vertices and the triangulation of the user. And following the Texture to Polygonmsample i used this line to create the shape, where farseerObject is a list of vertices of the triangles: _compound = BodyFactory.CreateCompoundPolygon(World, farseerObject, 1f, BodyType.Dynamic); But I have to update the body each frame (like 30 fps) and this is very slow. I get just 2 or 3 fps. There's another (faster) way to create the Body from a list of triangles or the contour vertices?

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  • What is the best plan to handle server fault for google app engine [closed]

    - by lucemia
    I used google-appengine without preparing much backup plans before, but it looks like not a good idea anymore.... Since google app engine is quite hard to find a backup replacement, I plan to just add a "server error" page which will show while server fault. Currently I am thinking to: Use the cdn cloudfare in front of google app engine. It will also handle the NAME server for me. Prepare some static version of webpages (such as "Oops! the server fault") in another hosting platform While google app engine failed, I will switch the destination from google app engine to the static page by change the CNAME records on cloudfare. Is there any other recommand way to solve this situation?

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  • Thread locking issue with FileHelpers between calling engine.ReadNext() method and readign engine.Li

    - by Rad
    I use producer/consumer pattern with FileHelpers library to import data from one file (which can be huge) using multiple threads. Each thread is supposed to import a chunk of that file and I would like to use LineNumber property of the FileHelperAsyncEngine instance that is reading the file as primary key for imported rows. FileHelperAsyncEngine internally has an IEnumerator IEnumerable.GetEnumerator(); which is iterated over using engine.ReadNext() method. That internally sets LineNumber property (which seems is not thread safe). Consumers will have Producers assiciated with them that will supply DataTables to Consumers which will consume them via SqlBulkLoad class which will use IDataReader implementation which will iterate over a collection of DataTables which are internal to a Consumer instance. Each instance of will have one SqlBulkCopy instance associate with it. I have thread locking issue. Below is how I create multiple Producer threads. I start each thread afterwords. Produce method on a producer instance will be called determining which chunk of input file will be processed. It seems that engine.LineNumber is not thread safe and I doesn't import a proper LineNumber in the database. It seems that by the time engine.LineNumber is read some other thread called engine.ReadNext() and changed engine.LineNumber property. I don't want to lock the loop that is supposed to process a chunk of input file because I loose parallelism. How to reorganize the code to solve this threading issue? Thanks Rad for (int i = 0; i < numberOfProducerThreads; i++) DataConsumer consumer = dataConsumers[i]; //create a new producer DataProducer producer = new DataProducer(); //consumer has already being created consumer.Subscribe(producer); FileHelperAsyncEngine orderDetailEngine = new FileHelperAsyncEngine(recordType); orderDetailEngine.Options.RecordCondition.Condition = RecordCondition.ExcludeIfBegins; orderDetailEngine.Options.RecordCondition.Selector = STR_ORDR; int skipLines = i * numberOfBufferTablesToProcess * DataBuffer.MaxBufferRowCount; Thread newThread = new Thread(() => { producer.Produce(consumer, inputFilePath, lineNumberFieldName, dict, orderDetailEngine, skipLines, numberOfBufferTablesToProcess); consumer.SetEndOfData(producer); }); producerThreads.Add(newThread); thread.Start();} public void Produce(DataConsumer consumer, string inputFilePath, string lineNumberFieldName, Dictionary<string, object> dict, FileHelperAsyncEngine engine, int skipLines, int numberOfBufferTablesToProcess) { lock (this) { engine.Options.IgnoreFirstLines = skipLines; engine.BeginReadFile(inputFilePath); } int rowCount = 1; DataTable buffer = consumer.BufferDataTable; while (engine.ReadNext() != null) { lock (this) { dict[lineNumberFieldName] = engine.LineNumber; buffer.Rows.Add(ObjectFieldsDataRowMapper.MapObjectFieldsToDataRow(engine.LastRecord, dict, buffer)); if (rowCount % DataBuffer.MaxBufferRowCount == 0) { consumer.AddBufferDataTable(buffer); buffer = consumer.BufferDataTable; } if (rowCount % (numberOfBufferTablesToProcess * DataBuffer.MaxBufferRowCount) == 0) { break; } rowCount++; } } if (buffer.Rows.Count > 0) { consumer.AddBufferDataTable(buffer); } engine.Close(); }

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  • How does one escape the GPL?

    - by tehtros
    DISCLAIMER I don't pretend to know anything about licensing. In fact, everything I say below may be completely false! Backstory: Recently, I've been looking for a decent game engine, and I think I've found one that I really like, Cafu Engine. However, they have a dual licensing plan, where everything you make with the engine is forced under GPL, unless you pay for a commercial license. I'm not saying that it's a bad engine, they even say that they are very relaxed about the licensing fees. However, the fact that it even involves the GPL scares me. So my question is basicly, how does one escape the GPL. Here's an example: The id Tech engine, also known as the Quake engine, or the Doom engine, was the base for the popular Source engine. However, the id Tech engine has been released under the GPL, and the Source engine is proprietary. Did Valve get a different license? Or did they do something to escape the GPL? Is there a way to escape the GPL? Or, if you use GPL'd source code as a base for another project, are you forced to use the GPL, and make your source code available to the world. Could some random person take the id Tech engine, modify it past the point of recognition, then use it as a proprietary engine for commercial products? Or are they required to make it open source. One last thing, I generally have no problem what-so-ever with open source. However I feel that open source has it's place, but that is not in the bushiness world.

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  • Small projects using the cathedral model: does open-source lower security?

    - by Anto
    We know of Linus' law: With enough eyeballs all bugs are shallow In general, people seem to say that open-source software is more secure because of that very thing, but... There are many small OSS projects with just 1 or 2 developers (the cathedral model, as described by ESR). For these projects, does releasing the source-code actually lower the security? For projects like the Linux kernel there are thousands of developers and security vulnerabilities are quite likely going to be found, but when just some few people look through the source code, while allowing crackers (black hat hackers) to see the source as well, is the security lowered instead of increased? I know that the security advantage closed-source software has over OSS is security through obscurity, which isn't good (at all), but it could help to some degree, at least by giving those few devs some more time (security through obscurity doesn't help with the if but with the when). EDIT: The question isn't whether OSS is more secure than non-OSS software but if the advantages for crackers are greater than the advantages for the developers who want to prevent security vulnerabilities from being exploited.

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  • How can I patch a PPA and then upload the patched source to my PPA?

    - by user318938
    I'm trying to do something very simple but I'm having a lot of problems. I am trying to have a patched wine PPA. I want to download the wine1.7 ppa source from the ubuntu team ppa, apply 1 patch file, and upload the patched source to my PPA to be built. I'm getting the source with apt-get source wine1.7. That part is fine. I have tried using quilt, but that doesn't help. My PPA builds fine. The problem is, it never has my patch applied to the binaries. How can I patch a PPA and upload the patched source to my PPA to be built? Thanks

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  • As a young student aspiring to have a career as a programmer, how should I feel about open source software?

    - by Matt
    Every once in a while on some technology websites a headline like this will pop up: http://www.osor.eu/news/nl-moving-to-open-source-would-save-government-one-to-four-billion My initial thought about government and organizations moving to open source software is that tons of programmers would lose their jobs and the industry would shrink. At the same time the proliferation and use of open source software seems to be greatly encouraged in many programming communities. Is my thinking that the full embrace of open source software everywhere will hurt the software industry a misconception? If it is not, then why do so many programmers love open source software?

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  • How do I get the source code from a Google Code game project?

    - by BluFire
    I'm trying to get the Hedgewars source code. When I went to the downloads tab, it doesn't specify which is the actual game. I tried downloading it using the SVN Checkout on Tortoise, but it seems like it doesn't work on the browse section of Source. (Hgproject_filesAndroid_buildSDL-android-project) I then proceeded to the wiki but I got stuck at step two because I don't know anything about Mercurial. Some other things I don't know from the wiki is "FreePascal" "Android NDK" and "Tar" files. They are new to me so I am really confused. So my question is, how can I download the source code from Hedge Wars for Android without having to browse the source code inside the source tab?

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  • What is the difference between industrial development and open source development?

    - by Ida
    Intuitively, I think open source development should be much more "casual" than industrial development process (like in Microsoft). Because for OSS development: Duty separation is not that strict than in big companies (maybe developers == testers in open source development?) People come in and out of the open source community, much more frequently than in big companies However, above are just my guesses. I really want to know more about the major difference between the open source and industrial development. Is their division of duty totally different (e.g., is there a leader/manager-like role in open source development?)? Maybe it is their communication style that differs a lot? Or their workflow? Please share your opinions. Thanks a lot!

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  • Can I require a large donation ($499) in order for a company to receive an extended version of my open source project? [closed]

    - by Damian
    I want to make my project open source but some of its more advanced features are targeted to companies so I would like to require a donation before I send the source code to the donating company. It will be something like that: "If you want to use the extended features of XXXXXXX, please make a donation of $499 and you will receive the source code and the jar with the extended features. You will also receive personalized support by email." Is it legal and acceptable to do something like that? Can the companies donate an amount like that to an open source project? I mean, is it easy for them in terms of their accounting, tax, etc. to donate $499 dollars to an open source project. I know it is not a matter whether they will have money or not but more of a paying procedure matter.

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  • What made you contribute to that open source project? [closed]

    - by Ermin
    I'm interested in real experience and personal answers not just those standard worn out "benefits of contributing to open source" that we all memorized by heart by now. I've met many people who contribute to open source project and almost never did this topic come up: why did they contribute to this open source project. So, if you've contributed to an open source project before in any way, can you please pause for a second and try to remember what really made you decide to contribute to that particular project. Was it a random decision, was it because you were bored, was it because the company you worked for was already using it and you contributed as part of your job, was it because the project was too big you wanted to get contracts, or the project was too small you wanted to build it, or because your prof or co-worker asked you to help with his open source project, or..... To substantiate your reasons, please mention the project name and rate your involvement (heavy, occasional, light, once).

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  • Pros & Cons of Google App Engine

    - by Rishi
    Pros & Cons of Google App Engine [An Updated List 21st Aug 09] Help me Compile a List of all the Advantages & Disadvantages of Building an Application on the Google App Engine Pros: 1) No Need to buy Servers or Server Space (no maintenance). 2) Makes solving the problem of scaling much easier. Cons: 1) Locked into Google App Engine ?? 2)Developers have read-only access to the filesystem on App Engine. 3)App Engine can only execute code called from an HTTP request (except for scheduled background tasks). 4)Users may upload arbitrary Python modules, but only if they are pure-Python; C and Pyrex modules are not supported. 5)App Engine limits the maximum rows returned from an entity get to 1000 rows per Datastore call. 6)Java applications may only use a subset (The JRE Class White List) of the classes from the JRE standard edition. 7)Java applications cannot create new threads. Known Issues!! http://code.google.com/p/googleappengine/issues/list Hard limits Apps per developer - 10 Time per request - 30 sec Files per app - 3,000 HTTP response size - 10 MB Datastore item size - 1 MB Application code size - 150 MB Pro or Con? App Engine's infrastructure removes many of the system administration and development challenges of building applications to scale to millions of hits. Google handles deploying code to a cluster, monitoring, failover, and launching application instances as necessary. While other services let users install and configure nearly any *NIX compatible software, App Engine requires developers to use Python or Java as the programming language and a limited set of APIs. Current APIs allow storing and retrieving data from a BigTable non-relational database; making HTTP requests; sending e-mail; manipulating images; and caching. Most existing Web applications can't run on App Engine without modification, because they require a relational database.

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  • Android: "Edit Source Lookup Path...".

    - by user307480
    I am developing on a Mac with Eclipse and have the skeleton for an app that implements the standard framework callbacks (onCreate, onDestroy, onPause, etc..). When I set breakpoints in the callbacks the debugger stops and displays a tab that says "ActivityThread.performLaunchActivity(ActivityThread $ActivityRecord,Intent)line:2477" and in the tab page body there is some red text that says "Source not found" and a button that says "Edit Source Lookup Path...". I have tried adding several paths via "Edit Source Lookup Path..." but can't see to find the one Eclipse is looking for. Can anyone point me in the right direction?

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  • pluto or jetspeed on google app engine?

    - by Patrick Cornelissen
    I am trying to build something "portlet server"-ish on the google app engine. (as open source) I'd like to use the JSR168/286 standards, but I think that the restrictions of the app engine will make it somewhere between tricky and impossible. Has anyone tried to run jetspeed or an application that uses pluto internally on the google app engine? Based on my current knowledge of portlets and the google app engine I'm anticipating these problems: A war file with portlets is from the deployment standpoint more or less a complete webapp (yes, I know that it doesn't really work without a portal server). The war file may contain it's own web.xml etc. This makes deployment on the app engine rather difficult, because the apps are not visible to each other, so all portlet containing archives need to be included in the war file of the deployed "app engine based portal server". The "portlets" are (at least in liferay) started as permanent servlet processes, based on their portlet.xmls and web.xmls which is located in the same spot for every portlet archive that is loaded. I think this may be problematic in the app engine, because everything is in one big "web app", so it may be tricky to access the portlet.xmls from each archive. This prevents a 100% compatibility in my opinion. Is here anyone who has any experience with the combination of portlets and the app engine? Do you think it's feasible to modify jetspeed, pluto or any other portlet container to be able to run it on the app engine?

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  • Netbean Cannot update Google App Engine server to appengine-java-sdk-1.3.2

    - by sy
    I am using Netbean 6.7.1 I just update my google app engine plugin in netbean with Netbean auto update. I found out there is new app engine SDK. So i want to update my google app engine server to point to appengine-java-sdk-1.3.2 After I download appengine-java-sdk-1.3.2.zip. I unzip it. Then at Netbean: I already have a Google App Engine server under Services - Server. I can't find anyway to point it to the newly installed sdk folder. So I deleted the existing "Google App Engine" server & try to add a new one. Server - Add Server - Google App Engine - at "Installation Location", I point it to google app engine folder, which is "C:\appengine-java-sdk-1.3.2", it show this message at bottom "C:\appengine-java-sdk-1.3.2" & don't allow me to continue. May I know how to solve this? thanks!

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  • Can i make money with my Android Engine or should I focus on game-making?

    - by Roger Travis
    I have dedicated past few month to developing my own android 2d engine. You can see its description, demo and tutorials here http://www.aboxengine.com/ ( jar files will be up in a day or two ). While working on the engine I believed it to be better then most available alternatives ( such as andengine, etc. ) and that people would love to use it in their games and, hopefully, would give me some royalties. Yet as I started posting about my engine on other forums, it start looking like people are only interested in free/opensource engines. Based on your experience, what do you think, is there some way for me to make money with that engine or should I forget about selling it and more focus on making games with it myself? Thanks!

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  • Is it a good idea to simplify an character -driven game engine to the point it's unnecessary to learn scripting/programming ?

    - by jokoon
    I remember, and I still think, that one cannot even make a prototyped 3D game to test just simple behaviors without using gigantic tools like unity or knowing extensive C++ programming, design pattern, a decent or basic 3D engine, etc. Now I'm wondering, since I know programming, that I'm still more lucky that the ones who need to learn programming prior to know how to make something: even scripted engines such as unity are not for kids, and to my sense they tend to dictate their ways of doing things, which is not the case with engine like ogre or irrlicht. I remember toying a little with the blender game engine, it was possible to link states or something I don't remember very well. Now I'm thinking that character driven games occupies a big part of the game market. Do you think it is a good idea to make a character-controlled oriented game engine which allows only to build AI instead of anything else ?

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  • What are the pros/cons of using a 3d engine for 2d games?

    - by mrohlf
    What pros or cons should a beginner be aware of when deciding between a 2d game engine (like Slick2D/Flixel/FlashPunk) and a 3d engine (like Unity) for 2d game development? I am just getting started in indie game development, though I have dabbled a bit with Game Maker, Flash, and XNA in the past. I've heard a lot of positive things about Unity, and its cross-platform nature makes it appealing, but as I understand, it's a 3d engine at its core. For a strictly 2d game, are there any compelling reasons to work with a 3d engine like Unity? Or would it just add unneeded complexity to my initial learning experience?

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