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• Java graphic objects as in flashgames

  - by Ryu Kajiya

  How is it possible (with the standard Java2D engine) to use small sprites like graphic objects? For those who don't know what I mean, in all those Flash-games like on Facebook they put small sprites on the screen which react to mouse-over and clicks. I tried to do the same in Java but can't find a good method. Swing components always spread over the whole bitmap, but I only want to get a reaction from the object when the mouse is over a pixel that's not transparent. So basically checking every time if the object below the mouse contains a non-transparent pixel (which i believe could be pretty intense in a gameloop or repaint loop). I have no idea how to implement such a thing efficiently.

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• Framework for interaction between web-page and server-side script

  - by Carrier

  I want to make a web-page that will have several controls elements, among which there are elements like check-boxes, radio-buttons, "range selectors" (one can specify the min and max value, like it is done when you select range for prices in the online markets). The new values shall be sent to the "server-side", once changed (without any Submit buttons etc), and the "server-side" can return something (one or more numbers, etc). Does anyone know a good ajax-like framework that allows (with minimal adaptation / changes) to make such solution in an easy way? It will be good if the server-side of existing solution will be in Perl (not a big deal, but I know it much better than PHP or something else). Set of controls might change and depend on other parameter, so adding one extra element should not cause rewriting the whole thing. P.S.: I haven't working in this area for quite a while, so not aware of existing solutions in this area, and don't want to invent the wheel and write everything from scratch for something that already exist (at least, I hope so). Thanks in advance!

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• Is programming or computer science in general, all about algorithms?

  - by wakandan

  As a grad student, I find it more and more common for prestigious companies (like Google, Facebook, Microsoft,...) to put algorithm questions in their test and interviews. A few startups I applied to also asked about algorithms. I wonder if algorithms fluency is the most important thing for software developer in those companies? If the answer being yes, what are the best method or resources for one to learn & practice about algorithms effectively? I can't seem to get interested in solving seemingly too complicated problems found in most textbook or websites. Though easily understand basic algorithms (like quicksort, bubblesort,...), I find it immensely difficult to remember and reuse them later. Thanks. P/S: If you ask me what I like, it's building good softwares to solve users' problems innovatively. I suppose that does not necessarily mean the software has to be very complicated.

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• Easy Method to Change Color on UI Elements

  - by A13X

  This isn't a language-specific thing as far as I'm concerned. I was wondering what may be a quick way to change the COLOR of a certain on-screen element such as a button and its associated text. I would assume there is a trick to making a graphics engine so maybe individuals pixels or groups of sprites can have their colors easily shifted. A lot of game interface buttons and such have this so you know when an event like a click has occurred. Any pseudo code would be helpful and I am working in Android (not XML fluff), but again, this probably is not a very specific question, just an inquiry on how to go about this.

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• Event Aggregator.. not getting a response, how to determine completion?

  - by Duncan_m

  I'm rewriting a vehicle tracking application, a google maps based thing.. The users are able to search for a vehicle by typing a few characters of the vehicles "callsign". My application is based around a sort of "event bus" within Backbone.. when a search occurs I send a message on the bus saying something like "does anyone match this?".. If a marker matches the search term it responds with a sort of "yes, I match!".. My challenge arises when no-one matches, I get no response.. it feels a little hacky to "wait a little while" and check if a response has been recieved.. The application is based around Backbone.js and using the Event Aggregator pattern described in the answer to this question on Stack Overflow: http://stackoverflow.com/questions/7708195/access-function-in-one-view-from-another-in-backbone-js Is there a well defined design pattern that might assist me here? Sending a request for a response and not getting any responses?

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• How to design an interface, where things need to be called in a specific sequence?

  - by Vorac

  The task is to configure a piece of hardware within the device, according to some input specification. This should be achieved as follows: 1) Collect the configuration information. This can happen at different times and places. For example, module A and module B can both request (at different times) some resources from my module. Those 'resources' are actually what the configuration is. 2) After it is clear that no more requests are going to be realized, a startup command, giving a summary of the requested resources, needs to be sent to the hardware. 3) Only after that, can (and must) detailed configuration of said resources be done. 4) Also, only after 2), can (and must) routing of selected resources to the declared callers be done. A common cause for bugs, even for me, who wrote the thing, is mistaking this order. What naming conventions, designs or mechanisms can I employ to make the interface usable by someone who sees the code for the first time?

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• Advice on approaching a significant rearrangement/refactoring?

  - by Prog

  I'm working on an application (hobby project, solo programmer, small-medium size), and I have recently redesigned a significant part of it. The program already works in it's current state, but I decided to reimplement things to improve the OO design. I'm about to implement this new design by refactoring a big part of the application. Thing is I'm not sure where to start. Obviously, by the nature of a rearrangement, the moment you change one part of the program several other parts (at least temporarily) break. So it's a little 'scary' to rearrange something in a piece of software that already works. I'm asking for advice or some general guidelines: how should I approach a significant refactoring? When you approach rearranging large parts of your application, where do you start? Note that I'm interested only in re-arranging the high-level structure of the app. I have no intention of rewriting local algorithms.

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• All files erased after installing ubuntu 11.04 alpha 3

  - by wifi

  Yeah I know I should have backed up my files before proceeding, I completely forgot. Well, the thing is that I had a dual-boot system with Windows 7 and Ubuntu 10.10. Yesterday, I installed Ubuntu 11.04 alpha 3 (through live USB). I chose that 11.04 would install over 10.10 on the installation wizard, where I have no important files. However, it overwrote Windows too, and its data. Is there some way to recover it? Thanks!

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• Why are the proposed BADSIG (on apt-get update) fixes secure?

  - by EvanED

  I'm running apt-get update, and I see errors like W: GPG error: http://us.archive.ubuntu.com precise Release: The following signatures were invalid: BADSIG 40976EAF437D05B5 Ubuntu Archive Automatic Signing Key <[email protected]> It's not hard to find instructions on how to fix these problems, for instance by asking for the new keys with apt-key adv --recv-keys or rebuilding the cache; so I'm not asking about how to fix these. But why is this the right thing to do? Why is "oh, I need new keys? Cool, go get new keys" not just defeating the purpose of having a signed repository in the first place? Are the keys signed by a master key that apt-key checks? Should we be doing some additional validation to ensure that we're getting legitimate keys?

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• Chinese bots in my forum

  - by TdotThomas

  I have a small community forum that doesn't really get posts or any real traffic. The only thing that happens on the regular is bots with Chinese IPs signing up gibberish usernames. Most bots don't make it past the captcha but some do. I try to stay on top of this by banning IPs and ranges of IPs but it doesn't really seem to help. The bots never post anything so what are they doing? Should I be worried? Should I keep banning IPs or is it futile?

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• Getting Started with 12.04 LTS Problems

  - by mark

  Okay previously I used ubuntu 10.04 in Desktops and Loved it! I bought a newer Toshiba Satellite with an i7 CPU, 8GB Ram, 1TB HD, first thing I tried to do was install Ubuntu 9 on it then I found out it was no longer Supported. (I gave my 10.04 disk away) So I tried installing Windows 7 and experienced SO MANY problems, I am going back to try 12.04. Starting all over again. After installing 12.04 Wireless was Detected yet said it was Disabled by a Hardware Switch. Went read through the Message Boards found Solution which was Sudo rf Kill All. Okay all excited I would finally get my Ubuntu to finally work I rushed back to my laptop from the internet cafe, and went looking for the TERMINAL input on my Ubuntu 12.04, and I cannot find the Terminal. If I can't find the TERMINAL how Can I enter any Sudo Stuff? So I guess the first question is Where is the Terminal Located in 12.04? Thank you.

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• Upgrade from 12.04 to 13.10: Computer won't boot

  - by Christian

  I upgraded from 12.04 to 13.10 and my computer boots to a black screen. I hear the drumroll, but there is no functionality after that. I've downloaded a livecd of 12.04 on my other computer, and I changed the BiOS settings to boot from CD/DVD first, but it still does the same thing. I booted advanced options, edited [ro quick splash] to [ro nomodeset] and it started normally. I rebooted the system and it was back to the same junk. What do I need to do while it is operating to make it reliable with every restart? This seems to be a systemic issues with NUMEROUS Ubuntu upgrades, but I haven't read a solution yet. I need some help, please! Thanks.

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• Wubildr.mbr is missing or corrupted

  - by Matej Kranjec

  I just installed Ubuntu using WUBI. I followed this tutorial and when I select Ubuntu from Windows boot loader, it says wubildr.mbr is missing or corrupted. Then Windows boot manager appears again. I try again. The same error. Then I go to Windows, and checked the wubildr.mbr which is in winboot. It is only 8 kb big. Is that normal? Is it corrupted? And one more thing. When I installed using WUBI, I got that error screenshot on (http://94.140.81.66/error.png)

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• GPU optimization question: pre-computed or procedural?

  - by Jay

  Good morning, I'm learning shader program and need some general direction. I want to add noise to my laser beam (like this). Which is the best way to handle it? I could pre-compute an image and pass it to the shader. I could then use the image to change the opacity and easily animate the smoke by changing the offset of the texture lookup. I could also generate noise in the shader and do the same thing the texture was used for. Is it generally better to avoid I/O to the graphics card or the opposite? Thanks!

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• Adwords: is it possible to automatically copy changes in one campaign to other campaigns?

  - by Richard

  Is it possible to have identical campaigns except for one thing, and whenever changes are made to one campaign, the same changes are automatically made to others? I want to have identical campaigns running for different time zones, but for the campaigns only to run between particular hours of the day in each time zone. If I have a campaign for each time zone, when I make changes to one campaign, such as adding ad groups, or adding keywords, or changing bid amounts, etc, I want those changes to occur to the other campaigns also. Is this possible? Thanks,

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• Games with user-supplied artifical intelligence (AI) engines?

  - by RoboShop

  I remember Microsoft used to have this AI game for the .NET framework which allowed you to program a species and this species could be introduced to an "ecosystem" full of species that other people had programmed and they could interact with each other, etc. I can't remember what it was called, but I remembered thinking it was a pretty good idea. Are there any other similiar sites like that, which allows you to design some sort of AI engine and pit it against other programmer's creations? It could be an ecosystem type thing, or it could be a card or board game.

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• Editing gtk theme (adding a border)

  - by chadgh

  I am using a GTK theme which I love except that it doesn't have borders around the windows. If I am on a web page (for example) with a white background and my wallpaper is white I don't know where the web page starts. What is worse, sometimes that type of thing happens with other windows, where I can't tell where the one window start and the other ends. Is there a way to edit GTK themes? More specifically, is there a way to edit a theme so that it will display a border around windows?

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• What soft can create deb repository with several versions of the same package?

  - by bessarabov

  I want to create my own deb repository to store some packages. I've tried reprepro and it works fine, except one but fundamental feature. Reprepro can't store several versions of the same package in the repository. But the ability to store several versions of the same package is essential to me, so I'm asking what soft can do such a thing. Here is a piece of reprepro FAQ that shows that it can't do it: 3.1) Can I have two versions of a package in the same distribution? ------------------------------------------------------------------- Sorry, this is not possible right now, as reprepro heavily optimizes at only having one version of a package in a suite-type-component-architecture quadruple. You can have different versions in different architectures and/or components within the same suite. (Even different versions of a architecture all package in different architectures of the same suite). But within the same architecture and the same component of a distribution it is not possible.

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• What is the most cross-browser/system compatible option for 3d graphics on a web page?

  - by LachlanB

  I would like to develop a bit of functionality for a web site that involves a bit of 3D - the user can move around objects, rotate them and texture them. So far I've looked into: WebGL (in particular three.js) and it looks great, but it's not supported in IE nor IOS. IOS supports the <canvas> tag, but only 2d. It looks like three.js has an unsupported hack to make a 3d thing use the 2d canvas instead without textures, but this looks like a hack. I also considered resorting to Flash which works on most browsers, but that won't work on IOS. What's my best option for doing 3d web graphics on the vast array of browsers and interfaces? At the moment I'm thinking WebGL for web (and ask people to use chrome or firefox, and take the hit on IE) and then maybe write a native app for IOS, but I am not sure if there are better alternatives available that I don't know of.

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• PowerShell script to find files that are consuming the most disk space

  As you know, SQL Server databases and backup files can take up a lot of disk space. When disk is running low and you need to troubleshoot disk space issues, the first thing to do is to find large files that are consuming disk space. In this article I will show you a PowerShell script that you can use to find large files on your disks. 12 essential tools for database professionalsThe SQL Developer Bundle contains 12 tools designed with the SQL Server developer and DBA in mind. Try it now.

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• How to convince the agile product owner to change their mind? [closed]

  - by Joshiatto

  A friend of a friend ran into a situation recently in which the agile product owner specified features down to exactly what every single user click should look like. The problem is, the dev team has already figured out a way to accomplish the business value in fewer clicks (better UX), but in the past, questioning the product owner has led to career disaster. How do we convince the product owner to change their mind and go along with our recommendation? What can be done within the agile model to fix this situation and how do we accomplish it? On a bigger level: What can be done to make agile product owners better at their job to prevent this kind of thing from happening?

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• SQL Injection: How it Works and How to Thwart it

  This is an extract from the book Tribal SQL. In this article, Kevin Feasel explains SQL injection attacks, how to defend against them, and how to keep your Chief Information Security Officer from appearing on the nightly news. NEW! The DBA Team in The Girl with the Backup TattooPina colada in the disk drives! How could any DBA do such a thing? And can the DBA Team undo the damage? Find out in Part 2 of their new series, 5 Worst Days in a DBA’s Life. Read the new article now.

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• Working on the search

  The one thing I've always like working on and about this site, is the full text search engine and spider. Bascially it goes out and spiders all the major development blogs on the web, and then indexes them. The engine uses Lucene for it's index. Lucene is another open source project and it works really fast. Currently the directory is indexed, and the rss feeds are underway. We're talking about a lot of content, but once it's done you'll be able to pull podcasts, and videos as they get posted to...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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• SSD harddisks & programming

  - by Carra

  SSD harddisks have been on the rise lately. And I've been wondering if it's worth buying one as a programmer. Being able to save five minutes when starting my PC is fun but won't convince my boss. How does it impact a typical visual studio project containing hundreds of files? Compile times, accessing files, waiting for visual studio to do its thing... Are there any benchmarks that checked this? And ideally, how much time would one win each week by upgrading?

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• How do I share common classes between windows forms and web applications using C#?

  - by earthdog

  In our environment we have multiple ERP servers plus data that are coming from multiple sources. I need to create a development roadmap for the coming years as it is obvious that side applications will be needed for many things. The choice is that the development will occur with Microsoft technologies. This means that I will be building either web apps (MVC, web forms e.t.c) or standard windows forms applications. The thing here is that I will be creating classes that will encapsulate the business logic that I want to apply to the different projects. What I thought so far: 1) Create class libraries dlls containing the required logic 2) Reuse these libs in my apps. But what about the web apps? Should I use the dlls directly or I should encapsulate them in web services and consume the web services in web apps? In general I would like to find out how should I build my strategy.

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