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• Video capture Performance

  - by volting

  I have noticed high CPU utilization in a number of applications (except mplayer) which read from the embedded webcam on my laptop. Bizarrely CPU utilization varies proportionately to the level of illumination present. I know that that high CPU usage has nothing to do with rendering the video, as I have written a simple app using the OpenCV library to simply grab frames from the webcam, and cpu usage is still high. I think that mplayer might be using my GPU (and the other apps aren't), but since its not an issue with rendering, I dont think this explains anything. Cheese Low light --- ~12% CPU Bright Light ---- ~63% CPU Camorama Low light --- ~7% CPU Bright Light ---- ~30% CPU Opencv C++ library, (display in a single highgui window) Low light --- ~13% CPU Bright Light ---- ~40% CPU (same test on windows 7, 4-9%) Mplayer No problem, 1-2% regardless of light levels Note: If all I want't to do is capture a feed from my webcam I would use mplayer and forget about it, but I'm developing an application which uses the OpenCV to capture a video feed among other things, performance is important.

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• Rotating an object about a point (2D) using box2d

  - by noob

  i just started developing using box2d on flixel and i realise the pivot point of the rotation of an object in box2d is set to the center of an object. i had read on forums and i found out that SetAsBox can change the pivot point of the object, however, i cannot seem to get it work to rotate about a point. what i would like to achieve is to rotate an object about a point like earth revolving around the sun. any one can help me with it? really thanks a lot and sorry for the bad english

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• Online & Offline in Web Chat Application

  - by Mohammed Safeer

  I stuck amidst developing a chat web application using php for client side app. I used comet for chat application. And use technique of updating database when someone logout. Thus display offline on other side user. My problem is if someone close browser without logout, how the other side user know the person goes offline. How can i set online and offline icon in a php webchat application, when someone close chat window without logout? Is web sockets in php solve this problem? welcome all suggestions.

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• Using JPA 2.0 with WebLogic Server 10.3.4 and Eclipse

  - by greg.stachnick

  Beginning in Oracle Enterprise Pack for Eclipse (OEPE) 11.1.1.6.1, we introduced a new feature for WebLogic Server configuration called Server Extensions. Similar in concept to project facets, Server Extensions allow us to install additional technologies, libraries, configurations, etc into an existing server runtime. WebLogic Server 10.3.4 introduces new support for Java Persistence 2.0, the new JEE 6 standard entity access. In order to start developing JPA 2.0 applications with WebLogic Server 10.3.4, a SmartUpdate patch must be applied to add and configure the EclipseLink libraries. More information on the manual EclipseLink installation and configuration can be found here. OEPE provides a Server Extension for JPA 2.0, making the addition and configuration of JPA 2.0 and EclipseLink much easier. When defining a new WebLogic Server 10.3.4 configuration, simply click the Install link for Java Persistence 2.0 and OEPE will take care of the WebLogic Server enablement for JPA 2.0.  

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• Where to advertise small open-source projects

  - by Saif Bechan

  I am searching for a good recourse where I can advertise my open source project. I have made a web-development framework which I want to make available to download, and I want to target a large audience. It is an open source project so I make no money off of it, so I do not really want to pay for advertisement. I already pay for the server where the website runs, and I have spent a lot of time developing it. I opened account on various search engines webmaster tools, so people can find it on there. I have also made a video-sharing account where I uploaded a few tutorials. This can accumulate some traffic also. Can someone recommend any more places to get your work spread.

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• Permissions and MVC

  - by not-rightfold

  I’m in the progress of developing a web application. This web application is mostly a CRUD interface, although some users are only allowed to perform some actions and see only some parts of views. What would be a reasonable way to handle user permissions, given that some parts of views are not available to users? I was thinking of having a function hasPermission(permission) that returns true iff the current user has the given permission, although it would require conditionals around all parts of views that are only visible to some users. For example: {% if has_permission('view_location') %} {{ product.location }} {% endif %} I’m fearing this will become an ugly and unreadable mess, especially since these permissions can get kind of complicated. How is this problem commonly solved in web applications? I’m considering using Haskell with Happstack or Python with Django.

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• What tools should I consider if my aim is to make a game available to as many platforms as possible?

  - by Kenji Kina

  We're planning on developing a 2D, grid-based puzzle game, and although it's still very early in the planning stages, we'd like to make our decisions well from the beginning. Our strategy will be to make the game available to as many platforms as possible, for example PCs (Windows, Mac and/or Linux), mobile phones (iPhone and/or Android based phones), game consoles (XBLA and/or PSN) PC will have an emphasis, but I believe that's the most flexible platform so that shouldn't be a problem. So, what programming language, game engine, frameworks and all around tools would be best suited for our goal? P.S.: I'm betting a set of tools won't cover ALL of them, and that there will still be some kind of "translating" effort for some platforms, but we'd like to know what the most far reaching are.

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• Collision detection with heightmap based terrain

  - by Truman's world

  I am developing a 2D tank game. The terrain is generated by Midpoint Displacement Algorithm, so the terrain is represented by an array: index ---> height of terrain [0] ---> 5 [1] ---> 8 [2] ---> 4 [3] ---> 6 [4] ---> 8 [5] ---> 9 ... ... The rendered mountain looks like this: * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * 0 1 2 3 4 5 ... I want tanks to be able to move smoothly on the terrain (I mean tanks can rotate according to the height when they move), but the surface of the terrain is not flat, it is polygonal. Can anyone give me some help with collision detection in this situation? Thanks in advance.

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• Why are part-time jobs in programming an anomality?

  - by Mikle

  I've recently quit my full time developing job at mega-corp, and I decided that I'll look for a part time job. Since then I've talked to half a dozen potential employers, and every one of them had the same reaction when I said the magic words "part-time" - they all closed up and became suspicious. Now, I understand that it might just be me, so as control I asked every one of them what if I were willing to work full time, and they all said I would probably get an offer. My question is two fold: Why, as an employer, would you give up a competent, even great, developer, simply because he wants to work 3 days a week and not 5? How do I sell the story of part time job better? I usually just list my reasons which are that I prefer that balance currently in my life and that I want to work on my own projects, but it leaves them even more suspicious - am I going to start something myself and quit? Am I just lazy?

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• JavaOne 2012 session slides: "Dev Berkeley DB & DB Mobile Server for Java Embedded Tech"

  - by hinkmond

  The latest JavaOne 2012 slides are available on the Web. Here's the presentation that Eric Jensen and I did on "Developing Berkeley DB & DB Mobile Server for Java Embedded Technology". Enjoy! See: Click here for the slides in a new window It was fun to present this talk at JavaOne 2012 with Eric. We had some good questions from the audience. Let me know in the Comments if you have any further questions. I'll pass all the good questions to Eric and keep the bad questions for myself. Hinkmond

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• Philly GiveCamp 2010

  - by wulfers

  Spent the weekend helping out several non-profits doing what we like to do best...  Designing, developing and making people very happy with their new websites, systems, applications and features.  Form what I saw at this GiveCamp about 75 percent of the non-profits needed updated or new websites supporting CMS features and the ability for staff members to update the content on their websites.... Some cool apps were designed and developed..... A centralized system for distribution of daily schedules and task assistance to autistic clients was a show stopper with an awesome central management interface, IPhone and in the future windows phone support for tactile, auditory and visual cues. SharePoint was upgraded and forms were automated for a volunteer fire company that desperately needed some automation to help the fireman do their primary job. Many cool sites for non-profits that had ether an outdated or non existent web presence.

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• null values vs "empty" singleton for optional fields

  - by Uko

  First of all I'm developing a parser for an XML-based format for 3D graphics called XGL. But this question can be applied to any situation when you have fields in your class that are optional i.e. the value of this field can be missing. As I was taking a Scala course on coursera there was an interesting pattern when you create an abstract class with all the methods you need and then create a normal fully functional subclass and an "empty" singleton subclass that always returns false for isEmpty method and throws exceptions for the other ones. So my question is: is it better to just assign null if the optional field's value is missing or make a hierarchy described above and assign it an empty singleton implementation?

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• Collisions between moving ball and polygons

  - by miguelSantirso

  I know this is a very typical problem and that there area a lot of similar questions, but I have been looking for a while and I have not found anything that fits what I want. I am developing a 2D game in which I need to perform collisions between a ball and simple polygons. The polygons are defined as an array of vertices. I have implemented the collisions with the bounding boxes of the polygons (that was easy) and I need to refine that collision in the cases where the ball collides with the bounding box. The ball can move quite fast and the polygons are not too big so I need to perform continuous collisions. I am looking for a method that allows me to detect if the ball collides with a polygon and, at the same time, calculate the new direction for the ball after bouncing in the polygon. (I am using XNA, in case that helps)

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• Conditions for a traditional friends system vs. open following system

  - by Dan

  I'm just curious for everyone who is developing social sites out there. When you build a method for connecting users, do you prefer to use a following-style system (follow me, you can see all of my information and I can just choose to follow you back), or instead do you choose to have a friends-style system (I have to allow you see all of my information on your homepage, even if it is open to the public, vise versa). Why and under what circumstances do you use each? How do you manage privacy between your users? Have you use another way to connect your users? Examples of what methods you've choose and how you manage the user's privacy (private by default vs open to the web) are awesome; it could show correlation and provides an actual look.

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• Creating practically solvable 15 puzzle inputs

  - by Ashwin

  I am now developing a 15 puzzle game. I know the method to detect unsolvable puzzles. But unlike 8-puzzle, solution for 15-puzzle takes quite long time for some input states and can be solved within 5 seconds some other set of input states. Now the problem is that I cannot give the user(the player), a problem for which the solution takes more than 10 seconds(if he/she chooses to see the solution). So what I want is that when I initially shuffle the puzzle, I want to only present those puzzles which can be solved within 10 seconds. There must be some way to determine the hardness of the puzzle. I tried searching the net but could not find it. Does anyone know a way of determining the hardness of a puzzle? NOTE : I am using A* algorithm to find out the solution on a computer with 3GB RAM and 2.27GHZ processor.

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• Transiltion from maintenance programing to design

  - by andrew wang

  What to do guys do develop a design for a s/w for a given set of requirements? I like many people joined a Semiconductor MNC and got stuck in maintenance for quite a couple of years. My work was usually changing a lines of code for windows drivers supplied by my company or a couple of small script (style like) C programs for validating h/w. As a result I developed the bad habit of 'programming by coincidence'. I have not developed the ability for designing tools/programs from scratch. I was the only s/w member of the local team and thus some grunt work from the well established other site of the company came to be done by me. Now I have moved to a different company and thus finding developing from scratch very difficult. How do I unlearn my bad habit and develop this ability of designing s/w and then coding it ?

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• Design virtual resolution for 2D development in Unity

  - by djzmo

  I came to Unity with Cocos2D experience in mind. In Cocos2D, I can choose a "virtual" screen resolution size to rely on the entire game during development and the game will automatically adapt to different screen sizes in various devices. Now that I'm migrating to Unity and has access to 4.3 beta which has a native 2D workflow, is there a similar mechanism that will automate this? After playing around a bit with Unity, I also found out that Unity uses a neutral coordinate unit that can translate to pixels flexibly (CMIIW). But when developing a 2D game, I need them in pixels. Thank you.

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• SQLite with two python processes accessing it: one reading, one writing

  - by BBnyc

  I'm developing a small system with two components: one polls data from an internet resource and translates it into sql data to persist it locally; the second one reads that sql data from the local instance and serves it via json and a restful api. I was originally planning to persist the data with postgresql, but because the application will have a very low-volume of data to store and traffic to serve, I thought that was overkill. Is SQLite up to the job? I love the idea of the small footprint and no need to maintain yet another sql server for this one task, but am concerned about concurrency. It seems that with write ahead logging enabled, concurrently reading and writing a SQLite database can happen without locking either process out of the database. Can a single SQLite instance sustain two concurrent processes accessing it, if only one reads and the other writes? I started writing the code but was wondering if this is a misapplication of SQLite.

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• Forbes Article on Big Data and Java Embedded Technology

  - by hinkmond

  Whoa, cool! Forbes magazine has an online article about what I've been blogging about all this time: Big Data and Java Embedded Technology, tying it all together with a big bow, connecting small devices to the data center. See: Billions of Java Embedded Devices Here's a quote: By the end of the decade we could see tens of billions of new Internet-connected devices... with billions of Internet- connected devices generating Big Data, are the next big thing. ... That’s why Oracle has put together an ecosystem of solutions for this new, Big Data-oriented device-to-data center world: secure, powerful, and adaptable embedded Java for intelligent devices, integrated middleware... This is the next big thing. Java SE Embedded Technology is something to watch for in the new year. Start developing for it now to get a head-start... Hinkmond

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• Web-based CMS for mobile app

  - by JWood

  I'm just about to start developing a mobile app which needs to be fed from a CMS. I started designing the tables when I thought there must be something out there which could save me a load of time and let me concentrate on the mobile side of things. So, I'm looking for a CMS that will let me create hierarchical "pages" which will just be 4-5 database fields with a simple front-end to allow to edit and update them. I don't mind having to write some code to layout the database and forms etc, any saving on starting from scratch would be good. The only requirement is that I be able to access the data via some sort of web service, REST, JSON, XML, anything really... Can anyone suggest anything that might help? Thanks, J

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• Career in Game Development

  - by cantbereached

  Hello, I currently study computer engineering and I want to lead my career towards game industry which I always want to be a part of. But I am not sure where to start. I applied some of the companies in the industry for internship and so but most of them wants experience and some work in game developing. Many asks whether I developed a simple game or something similar which I haven't done so far. I am proficient at C, C++, Java, JS, HTML etc. Any tips from people experienced in the industry on where to start ?

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• Telesharp: An application metadata repository that enables true agility in enterprise .NET applications.

  - by Vishal

  Tellago Studios proudly announces its newest product, a third one within a year of time : TELESHARP .NET Configuration Management has always been a nightmare for any enterprise. TeleSharp is an innovative product that addresses the most common challenges of .NET applications in the enterprise. After years of struggle developing and managing large .NET applications, we decided to create a tool that makes .NET applications truly agile. You can read more about Telesharp and what difference it can make into your enterprise. Also if you want to see Telesharp in action, check the videos about it. Click here to get more information about TeleSharp trial version! Click here to register for the TeleSharp webinar on July 6th from 2PM - 3PM EST.   -Vishal

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• OTN Virtual Developer Day: WebLogic and Coherence

  - by Tori Wieldt

  Who: Java Developers What: This OTN Virtual Developer Day will guide you through tooling and best practices around developing applications with WebLogic and Coherence. You'll also explore ways to improve your your build, deploy, and ongoing management processes in your application's life cycle. When: Tuesday, November 5, 9am to 1pm PDT / 12pm to 4pm EDT / 1pm to 5pm BRT Where: Your Desk Why: Many Java developers utilize open source and/or free tooling to develop their projects, but ultimately deploy production applications to commercial, mission-critical application servers. There are sessions utilizing common developer tools such as Eclipse, Maven, Chef, and Puppet to create, deploy and manage applications with WebLogic Server and Coherence as target platforms. Don't miss the session Exploring ADF 12C and Java EE Development in Eclipse. Register now, it's free!  

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• Windows CE support forums

  - by Valter Minute

  As you may already know, microsoft is moving its communities to a new platform, based on web forums. The “old” USENET newsgroups are going to be replaced by web forums organized by categories. One for low-level platform development (for the guys working with Platform Builder), another one for native application development (for people writing their real-time applications in C/C++ or people using Silverlight for Windows Embedded) and, last but not least, a forum dedicated to managed application development (for people that are quickly developing their applications with the .NET Compact Framework). You can find the new forums here: http://social.msdn.microsoft.com/Forums/en-US/category/windowsembeddedcompact Read the “welcome” message to choose the best forum for your question and never forget that to have a good answer you should ask your question in a good way. Here you can find some suggestions about how you can ask questions (in newsgroup or forums): http://guruce.com/blogpost/howtoaskquestionsonnewsgroups (Thanks to Michel Verhagen for the article)

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• Casing of COM-Interop registered components

  - by Marko Apfel

  During a refactoring i realized that renaming of components, which will be registered for COM-Interop, must be done carefully. In my case i changed the casing of XyzToolbar to XyzToolBar. At the developing machine everything works fine. But after installing the modified stuff at the production machine, the toolbar was not visible. Using regasm with the new assemblies helped. So this was the hint: we use WIX to build the setup. And during setup-development the heat-tool extracted the needed registry-keys. And in these keys still was the old name XyzToolbar. Refreshing the names corrected the problem.

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