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• Data migration - dangerous or essential?

  - by MRalwasser

  The software development department of my company is facing with the problem that data migrations are considered as potentially dangerous, especially for my managers. The background is that our customers are using a large amount of data with poor quality. The reasons for this is only partially related to our software quality, but rather to the history of the data: Most of them have been migrated from predecessor systems, some bugs caused (mostly business) inconsistencies in the data records or misentries by accident on the customer's side (which our software allowed by error). The most important counter-arguments from my managers are that faulty data may turn into even worse data, the data troubles may awake some managers at the customer and some processes on the customer's side may not work anymore because their processes somewhat adapted to our system. Personally, I consider data migrations as an integral part of the software development and that data migration can been seen to data what refactoring is to code. I think that data migration is an essential for creating software that evolves. Without it, we would have to create painful software which somewhat works around a bad data structure. I am asking you: What are your thoughts to data migration, especially for the real life cases and not only from a developer's perspecticve? Do you have any arguments against my managers opinions? How does your company deal with data migrations and the difficulties caused by them? Any other interesting thoughts which belongs to this topics?

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• how to choose a web framework and javascript library?

  - by Trylks

  I've been procrastinating learning some framework for web apps w/ some library for AJAX, something like django with prototype, or turbogears with mootools, or zeta components with dojo, grok, jquery, symfony... The point is to spend some of my spare time, have "fun" and create cool stuff that hopefully is some useful. I think maybe I wouldn't like something like GWT or pyjamas because I wouldn't like to "get married" with some technology, I want to keep my freedom to add another javascript library, and so on. I didn't decide even the language yet, but I think I'd prefer python. PHP could be fine if there is some framework that is nice enough. Besides that, I don't even know where to start. I don't feel like learning a framework to then realize there is something that I cannot comfortably do, switch to another framework then find that a third framework has something really cool, etc. And the same goes for javascript libraries. So, some guidance would be really appreciated. I don't really know why are so many options available and what do they aim for, I guess some of them focus on some aspects and some on others, but I just want to make cool and nice apps that I can easily maintain, without spending too much time on coding or learning and avoiding the "trapped in the framework" feeling, when doing something is awfully complicated (or even impossible) with compared with the rest of things or doing that same thing on a different framework. I guess in the end I'll go for django and jquery since they are the most widely used options, afaik, but if I was going for the most widely used options I guess I should choose Java or PHP (I don't really like Java for my spare time, but php is not so bad), so I preferred to ask first. I think the question has to consider both, framework and library, since sometimes they are coupled. I think this is the place to ask this kind of things, sorry if not, and thank you.

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• A Modern Marketing Marvel: Eloqua Experience 2013

  - by kristin.jellison

  Hey there, partners— You’d be hard pressed to find a more convincing example of modern marketing than the one that descended upon San Francisco last week. We’re talking about Eloqua Experience 2013, of course. It is remarkable that a marketing technology conference has become a case study in successful 21st-century marketing practices. Eloqua Experience 2013 (#EE13) was all about customer-focused, targeted messaging, multichannel content, analytics and real-time multiscreen engagement. It made for a busy, yet interactive experience for over 2,000 eager attendees. This year’s event brought together some of the world’s most innovative marketers for three days of immersive sessions covering marketing best practices, customer stories and deep-dive technical classes. With 70 breakout sessions, product announcements, and a special conversation with Vince Gilligan, creator and executive producer of “Breaking Bad,” #EE13 brought a lot of critical marketing news to light. Oracle’s goal: to make sure our partners stay updated. As you know, Eloqua joined Oracle in late 2012, further rounding out our Customer Experience applications platform. Eloqua is a marketing automation solution and marketing cloud centerpiece that partners can use to target the right buyers, easily execute campaigns, bring leads to sales and bring in high ROIs. The resources below will help you stay on top of the industry’s best practices for marketing, plus all the advantages Eloqua can bring to partners. Partner Opportunities and Strategy with Eloqua The latest Eloqua partner strategy. Interview with Oracle Eloqua GM Kevin Akeroyd on Eloqua Experience A short recap of 2013’s Experience. Eloqua Product Announcements John Stetic, VP of Products for Oracle Eloqua, highlights the top product news, including a new profiler app and the ability to integrate display advertising into multichannel campaigns. Eloqua Experience Highlight Reel See what all the bustle was about. Eloqua Experience Session Overviews A quick look at what the keynote and breakout sessions covered, with links to session content. Modern Marketing Essentials Library Tips, blueprints, and strategies for success based on the 5 Tenets of Modern Marketing. Over and out, Your OPN Marketing Allies

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• Just started a job with Scrum. Something seems to be missing. I am new to Scrum

  - by punkouter

  The code is a complete mess of a combination of classic ASP/ASP.NET. The scrum consist of us patching up the big mess or making additions to it. We are all too busy doing that to start a rewrite so I am wondering.. Where is the part in Scrum where the developers can have the power to say that enough is enough and demand that they are given time to start the big rewrite ? We seem in an endless loop of just patching old code with 'Stories'. So things are being run by the non-technical people who seem to have no desire to push for a rewrite because they don't understand how bad the code base has gotten.. So who is in charge of making this big rewrite change happen ? The devs? The scrum master? The current strategy is just find time and do it ourselves without the higher ups involved.. since they are mostly to blame for the current mess we are in.. <-insert rant about non-tech people telling tech people what to do here-

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• Adding complexity by generalising: how far should you go?

  - by marcog

  Reference question: http://stackoverflow.com/questions/4303813/help-with-interview-question The above question asked to solve a problem for an NxN matrix. While there was an easy solution, I gave a more general solution to solve the more general problem for an NxM matrix. A handful of people commented that this generalisation was bad because it made the solution more complex. One such comment is voted +8. Putting aside the hard-to-explain voting effects on SO, there are two types of complexity to be considered here: Runtime complexity, i.e. how fast does the code run Code complexity, i.e. how difficult is the code to read and understand The question of runtime complexity is something that requires a better understanding of the input data today and what it might look like in the future, taking the various growth factors into account where necessary. The question of code complexity is the one I'm interested in here. By generalising the solution, we avoid having to rewrite it in the event that the constraints change. However, at the same time it can often result in complicating the code. In the reference question, the code for NxN is easy to understand for any competent programmer, but the NxM case (unless documented well) could easily confuse someone coming across the code for the first time. So, my question is this: Where should you draw the line between generalising and keeping the code easy to understand?

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• ERP/CRM Systems. Desktop Based ? Web based?

  - by Parhs

  Hello guys... I have seen 2-3 ERPs in action. I am wondering what is better. Desktop based application or webbased displayed on a browser. My first expirience was with a web based ERP when i was 14 years old.. It was web based and terribly slow... For most simple task you had to do lots of clicks... no keyboard support ..... Pages took ages to load. Last year i worked for migrating to a newer computer some old terminal based cobol application. The computer that worked till today and still has no problem was from 1993. The user interface ofcourse was textbased.. The speed that guys placed orders was amazing! just typing the name of the customer , then 5-10 keys to add a product to order.... Comparing to this ERP the page for placing orders Link (click sales orders) seems terribly slow to add a product... No keyboard shortcut works to save what you added and generally i believe you need 4 times more time to place an order compared to the text interface... Having to use both mouse and keyboard for this task is BAD and sadistic... So how can tek heck these people ever use a system like that ??? So in the long run desktop application seems the only way... Ofcourse browsers support shortcuts but the way to overide the defaults that browsers uses isnt cross compatible... That is a hudge problem. Finnaly, if we MUST/forced use cloud in near future what about keyboard shortcuts?? I feel confused... I have seen converters of desktop applications to browser applications but are SLOW as hell... The question is what about user friendliness?What kind of application would you use?

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• What to do when you're the interviewer and you don't like your job?

  - by emcb

  I'm in a sorta strange predicament, and I could use some advice. When I was interviewing for my current job, the job description I was given seemed pretty darn nice to me. Without going into the details, the job hasn't quite turned out the way it was advertised. The company is great and takes care of its employees, but for someone who cares about the code they write and the work they do, it's a bad environment - effectively, we operate between 0.5 and 1.0 on the Joel test, and due to political issues we're not going to move beyond that any time soon. Bitter? Maybe. OK...so I'm in the market for a new job. But that's not where my dilemma is. The problem that I see coming is that I will be participating in interviewing some candidates for a position on my team, and I'm not sure what to do. I've heard through the grapevine that we have some really solid, promising, fresh-out-of-college prospects coming in to interview, and I honestly dread the thought of somebody having their first experience of engineering in this department. So I'm wondering: what should I do if/when the interviewee asks me "Do you like your job?" (no) "What kind of projects would I be working on?" (mostly static HTML/CSS changes) Anything else that would elicit a negative answer if told truthfully Do I tell the truth, to give the candidate a real picture of the job? What if this scares them away, and what if it gets blamed on me? Do I fib or lie, saying we work on exciting projects with lots of flexibility, like the pitch my boss will give when the reality is quite different? Should I feel any kind of moral responsibility to let a promising young developer know that this isn't the job for them, or should I shut up and be loyal 100% to the company? Any approaches or advice is appreciated. I hope I don't come across as overly dramatic - I honestly struggle with this question.

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• HTML5 data-* (custom data attribute)

  - by Renso

  Goal: Store custom data with the data attribute on any DOM element and retrieve it. Previously under HTML4 we used to use classes to store custom data, something to the affect of <input class="account void limit-5000 over-4999" /> and then have to parse the data out of the class In a book published by Peter-Paul Koch in 2007, ppk on JavaScript, he explains why and how to use custom attributes to make data more accessible to JavaScript, using name-value pairs. Accessing a custom attribute account-limit=5000 is much easier and more intuitive than trying to parse it out of a class, Plus, what if the class name for example "color-5" has a representative class definition in a CSS stylesheet that hides it away or worse some JavaScript plugin that automatically adds 5000 to it, or something crazy like that, just because it is a valid class name. As you can see there are quite a few reasons why using classes is a bad design and why it was important to define custom data attributes in HTML5. Syntax: You define the data attribute by simply prefixing any data item you want to store with any HTML element with "data-". For example to store our customers account data with a hidden input element: <input type="hidden" data-account="void" data-limit=5000 data-over=4999  /> How to access the data: account  -     element.dataset.account limit    -     element.dataset.limit You can also access it by using the more traditional get/setAttribute method or if using jQuery $('#element').attr('data-account','void') Browser support: All except for IE. There is an IE hack around this at http://gist.github.com/362081. Special Note: Be AWARE, do not use upper-case when defining your data elements as it is all converted to lower-case when reading it, so: data-myAccount="A1234" will not be found when you read it with: element.dataset.myAccount Use only lowercase when reading so this will work: element.dataset.myaccount

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• How can I prevent seams from showing up on objects using lower mipmap levels?

  - by Shivan Dragon

  Disclaimer: kindly right click on the images and open them separately so that they're at full size, as there are fine details which don't show up otherwise. Thank you. I made a simple Blender model, it's a cylinder with the top cap removed: I've exported the UVs: Then imported them into Photoshop, and painted the inner area in yellow and the outer area in red. I made sure I cover well the UV lines: I then save the image and load it as texture on the model in Blender. Actually, I just reload it as the image where the UVs are exported, and change the viewport view mode to textured. When I look at the mesh up-close, there's yellow everywhere, everything seems fine: However, if I start zooming out, I start seeing red (literally and metaphorically) where the texture edges are: And the more I zoom, the more I see it: Same thing happends in Unity, though the effect seems less pronounced. Up close is fine and yellow: Zoom out and you see red at the seams: Now, obviously, for this simple example a workaround is to spread the yellow well outside the UV margins, and its fine from all distances. However this is an issue when you try making a complex texture that should tile seamlessly at the edges. In this situation I either make a few lines of pixels overlap (in which case it looks bad from upclose and ok from far away), or I leave them seamless and then I have those seams when seeing it from far away. So my question is, is there something I'm missing, or some extra thing I must do to have my texture look seamless from all distances?

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• Is micro-optimisation important when coding?

  - by BozKay

  I recently asked a question on stackoverflow.com to find out why isset() was faster than strlen() in php. This raised questions around the importance of readable code and whether performance improvements of micro-seconds in code were worth even considering. My father is a retired programmer, I showed him the responses and he was absolutely certain that if a coder does not consider performance in their code even at the micro level, they are not good programmers. I'm not so sure - perhaps the increase in computing power means we no longer have to consider these kind of micro-performance improvements? Perhaps this kind of considering is up to the people who write the actual language code? (of php in the above case). The environmental factors could be important - the internet consumes 10% of the worlds energy, I wonder how wasteful a few micro-seconds of code is when replicated trillions of times on millions of websites? I'd like to know answers preferably based on facts about programming. Is micro-optimisation important when coding? EDIT : My personal summary of 25 answers, thanks to all. Sometimes we need to really worry about micro-optimisations, but only in very rare circumstances. Reliability and readability are far more important in the majority of cases. However, considering micro-optimisation from time to time doesn't hurt. A basic understanding can help us not to make obvious bad choices when coding such as if (expensiveFunction() && counter < X) Should be if (counter < X && expensiveFunction()) (example from @zidarsk8) This could be an inexpensive function and therefore changing the code would be micro-optimisation. But, with a basic understanding, you would not have to because you would write it correctly in the first place.

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• How much effort should you put into a junior developer?

  - by Crazy Eddie

  At what point should one give up? I've tried helping them out by having them shadow me. We agree to break a minute, and then they go missing in action for a while...then just go back to their desk. Even when I know they've done this, part of me feels like I shouldn't have to go get them but that they should be showing interest in learning. Frankly, it's a bunch of time I don't have explaining things as I go when I could just do it. Am I expecting too much to expect that if they want to learn they'll make sure I know they're ready and willing? They go to meetings that they where not told they had to, good, but then sit in the corner and sleep...bad. I don't even know what to do with that. Sometimes I give them something small to do and they do it great, so I give them something just a touch harder and they totally fail, hard. Check in things without testing them. Part of me thinks that maybe I should be spending more time with them but at the same time I don't see a lot of interest and I really, honestly don't have time teaching the same things over and over. Sometimes I get asked questions that are really, really easy to answer if you just do a little bit of your own work trying to find out. Other times I'm not asked anything. I'm sure I could be doing better but honestly...I don't really want to anymore.

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• Penne alla MVP

  - by Valter Minute

  I’m sorry for the long silence on this blog and the long delay in replying to the friends that commented on my articles. I’ve been quite busy in the last weeks and I spent a lot of time traveling around Italy (not for pleasure!). In the meantime I’ve been renewed as an MVP on April the 1st (nice date to renew someone with such a bad sense of humor…). I decided to celebrate my MVP award with a new recipe (to be honest, I celebrated by eating the results of this recipe!) and I decided to call it “penne alla MVP”… just because I’m not good in finding nice names for my recipes. Ingredients (for 4 people): 360g pasta (penne or other short pasta) 300g small shrimps 1 cup of whipped cream 2 tablespoons of olive oil 1 small leek 1 glass of beer (I used Hoegaarden dutch white beer… but just because I like it and I finished the rest of the bootle while cooking) Chives Salt, pepper Prepare the pasta by boiling it in salted water, as usual. In the meantime chop the leek in very small bits, heat the oil inside a pan and when the oil is hot, drop the leek chops and let them cook for a few minutes. Add the shrimps and the glass of beer. Let them cook inside beer until they are cooked (if you used pre-cooked shrimps a couple of minutes would be enough to heat them and gave them the flavour of beer). Add the whipped cream and mix it well with the shrimps and the sauce. Dry the pasta and drop the sauce on top of it and then add the chives finely chopped.

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• GWB | Comment Spam On The Rise

  - by Geekswithblogs Administrator

  I don’t know a member on Geekswithblogs.net that is not frustrated with the amount of spam they get. It is a major problem that we have been dealing with for 6+ years and trying to come up with new ways to fight. As spammers get smarter, we have to continue to upgrade the tools we use to combat it. Just like any spam filter, sometimes good comments will get caught up. This has been a huge concern for some bloggers causing us to tame what we call spam and not spam. So this post is here just to state we know the spam problem is like a wave, sometimes it is not so bad, other times it gets worse. Right now it is worse. One measure we will take is a requirement for CAPTCHA soon if it continues since most members don’t clean up their spam via the admin tools (which are not the best tools, I know). Also I want to solicit a better approach from the members, what would you like the spam interface on GWB to be like? Be realistic cause we all want “Zero Spam, Good Comment live”. Related Tags: Geekswithblogs.net, Spam

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• Compiz slow under proprietary nvidia driver

  - by gsedej

  Hi! I am using Ubuntu 10.10 and have problem with proprietary nvidia driver for my GeForce GTS 250. I have issue with poor Compiz performance. And there is also open-source "noueau" driver. Proprietary: I tried many versions but neither works fast on desktop. This means 30 FPS without heavy effects. Currently I am using version 270.18. Even normal desktop use feels bad (moving windows) In games (and 3D benchmark) it is really good! (Unigine Heaven works good!) Open-source "nouveau": Very fast on desktop with heavy effects (blur, ...). I have 300 FPS and more, even in Expo mode. Games were good but not as good as prop. And driver causes xorg to crash even the latest (ppa:xorg-edgers/nouveau), so I switched back to proprietary. I also have computer with Ubuntu 10.04, GeForce 8600GT and drivers around 185.x and Compiz works great there. There is similar question Nvidia proprietary driver performance in 10.10 Which version of nvidia (prop) driver is fast in Compiz in Ubuntu 10.10? How do you install a specific version of nvidia driver? Is it the case that each newer driver works slower on compiz?

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• App installed in ~/usr launches from terminal but not Applications menu (or why does setting ld_library_path in .profile not work as it should)

  - by levesque

  I have built and installed an application under a directory of my choosing, let's say under /home/jim/usr, so files have been put in three-four folders, all under this $HOME/usr folder (e.g., bin, include, lib, share, etc.). I can launch this application from the command line just fine as I added the proper paths to my environement variables PATH and LD_LIBRARY_PATH in ~/.bashrc. I added the same paths to the ~/.profile file, which, if I'm not mistaken, is supposed to be parsed by Ubuntu. Doesn't work. Nothing. Where can I go from there? EDIT: I logged out/in and restarted my computer. Both didn't change a thing. The problem seems to come from the fact that no matter what I do the LD_LIBRARY_PATH environment variable is not properly passed to Ubuntu. Using log files, I found that the application I'm trying to run in this example doesn't find one it's dependencies located in ~/usr/lib. One solution would be to add the /home/jim/usr/lib folder inside a file located in /etc/ld.so.conf.d/, but I don't have admin rights on this machine. Making a wrapper script like this one works: #!/bin/bash export LD_LIBRARY_PATH=$HLOC/usr/lib application &> $HOME/application_messages.log but that would force me to wrap all my home compiled applications with this script. Any ideas? Why does Ubuntu/Gnome remove the LD_LIBRARY_PATH environment variable from my set variables? Is it because trying to do this is bad practice? UPDATE (and solution): As found by Christopher, there is a bug report about this on launchpad. LD_LIBRARY_PATH is unset after parsing of the ~/.profile file. See the bug report. Seems the only solution for now is to make a wrapper script.

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• How do I fix a garbled screen on a Gateway LT3103u?

  - by paracaudex

  I've been having garbled screen problems on a Gateway LT3103u on Ubuntu for a while. I just did a fresh install of Ubuntu 11.10 and continue to have issues. I installed xubuntu-desktop in case the issues had to do with the sophisticated GNOME graphics. The problem is less bad, but it's still there. After a few minutes of using XFCE, the screen gets garbled. I assume this has something to do with the graphics card, but I don't know how to go about troubleshooting something like this. Where should I start? Update: Here is the description of the VGA card from lspci -vvv: 01:05.0 VGA compatible controller: ATI Technologies Inc RS690M [Radeon X1200 Series] (prog-if 00 [VGA controller]) Subsystem: Acer Incorporated [ALI] Device 028c Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx- Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast TAbort- SERR- [disabled] Capabilities: [50] Power Management version 2 Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-) Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME- Capabilities: [80] MSI: Enable- Count=1/1 Maskable- 64bit+ Address: 0000000000000000 Data: 0000 Kernel driver in use: radeon Kernel modules: radeon Update: Setting GRUB_CMDLINE_LINUX="nomodeset" in /etc/default/grub seems to have fixed it in both Ubuntu and xubuntu-desktop. I will test it for a day or so to see if the problems recur and then post more detail with some links to an explanation. Update 2: It is possible to use this fix for Nvidia card (GTX 260) when graphics is defective after 11.10 upgrade/install? First few restarts was graphic ok, then after few restarts begins suddenly be defective and it stay so. I must returned to 11.04 because this problem and I wait for 12.04. So I hope in this fix.

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• Where do I start in regards to making a Gnome/Unity Form Application

  - by JMK

  Ok so I am familiar with developing Form and Console applications on Windows using Visual Studio .Net with C#, but where do I start when it comes to Linux distro's like Ubuntu, is there an equivalent? How would one go about matching what they can do in a Windows environment with .Net and C# in a Linux environment without .Net coding in something like Java or C/C++? I am aware of Eclipse, does eclipse have a form designer or do you have to code the design of any Gnome/Unity forms manually? Can I use eclipse to write the Linux equivalent of a console application, that you just double click on to run? I also know about Mono, but the idea is that I want to learn how to develop software without using anything in the Microsoft stack and am not sure where to start. What is the standard language/framework used to develop these types of applications on Linux? As I become more proficient with Visual Studio, C# and .Net, it has struck me that without these Microsoft tools, I am nothing. I am only capable of developing for the Microsoft OS and this scares me. This isn't some anti Microsoft thing, Microsoft makes some incredible Software/Hardware/Operating Systems/IDE's, but it is generally a bad idea to put all of your eggs in one basket so if I want to learn how to develop Terminal and Gnome/Unity form applications where in the world do I start? I have used Linux on and off for years, but Windows has been my primary OS. However I have watched Linux get better and better and as much as I love Windows 7, I am dubious about Windows 8 (I for one will sorely miss my start menu)! Obviously MS aren't going anywhere anytime soon and I could spend the the next couple of decades developing for .Net without any issues but just because you can get away with something doesn't always mean it's a good idea. Thanks

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• Evaluating a Programmer for Startup

  - by HelpJ

  Hi, I have sorted through the previous questions and couldn't find a specific answer to the following (and thank you in advance): I have fully developed my idea on paper and am looking to move forward with it, create it, and grow it. Since I am non-technical, I am looking to either partner or employ (I would pay for his/her services) for a very talented and well-rounded programmer to help create and develop the project. I am looking for someone that can act as a IT manager/CTO and get the job done while I use my resources to develop and deploy the strategy, deal with the business side of things, raise capital, grow, etc. However, due to my lack of IT knowledge, it is always hard for me to differentiate between a good and bad programmer and therefore only find out if he/she is good or not when it is too late. So my question that I have been asking everyone around me is "How do I assess whether the programmer is good or not if I cannot evaluate them myself?" and "Is there any website that reviews and rates programmers?" I have asked many to refer me to talented programmers but all are either not local (important for me to work side by side with them), happily employed or working on their own startup. I have also asked these programmers to help me find others but none seem to be able to help. Any help would be extremely appreciated. Thank you so much, HelpJ

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• How to explain why design choices are good?

  - by Telastyn

  As I've become a better developer, I find that much of my design skill comes more from intuition than mechanical analysis. This is great. It lets me read code and get a feel for it quicker. It lets me translate designs between languages and abstractions much easier. And it let's me get stuff done faster. The downside is that I find it harder to explain to teammates (and worse, management) why a particular design is advantageous; especially teammates that are behind the times on best practices. "This design is more testable!" or "You should favor composition over inheritance." go right over their heads, and lead into the rabbit hole of me trying to clue everyone in to the last decade of software engineering advances. I'll get better at it with practice of course, but in the mean time it involves a lot of wasted time and/or bad design (that will lead to wasted time fixing it later). How can I better explain why a certain design is superior, when the benefits aren't completely obvious to the audience?

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• Animation API vs frame animation

  - by Max

  I'm pretty far down the road in my game right now, closing in on the end. And I'm adding little tweaks here and there. I used custom frame animation of a single image with many versions of my sprite on it, and controlled which part of the image to show using rectangles. But I'm starting to think that maybe I should've used the Animation API that comes with android instead. Will this effect my performance in a negative way? Can I still use rectangles to draw my bitmap? Could I add effects from the Animation API to my current frame-controlled animation? like the fadeout-effect etc? this would mean I wont have to change my current code. I want some of my animations to fade out, and just noticed that using the Animation API makes things alot easier. But needless to say, I would prefer not having to change all my animation-code. I'm bad at explaining, so Ill show a bit of how I do my animation: private static final int BMP_ROWS = 1; //I use top-view so only need my sprite to have 1 direction private static final int BMP_COLUMNS = 3; public void update(GameControls controls) { if (sprite.isMoving) { currentFrame = ++currentFrame % BMP_COLUMNS; } else { this.setFrame(1); } } public void draw(Canvas canvas, int x, int y, float angle) { this.x=x; this.y=y; canvas.save(); canvas.rotate(angle , x + width / 2, y + height / 2); int srcX = currentFrame * width; int srcY = 0 * height; Rect src = new Rect(srcX, srcY, srcX + width, srcY + height); Rect dst = new Rect(x, y, x + width, y + height); canvas.drawBitmap(bitmap, src, dst, null); canvas.restore(); }

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• A* Start path finding in HTML5 Canvas

  - by gyhgowvi

  I'm trying implement A* Start path finding in my games(which are written with JavaScript, HTML5 Canvas). Library for A* Start found this - http://46dogs.blogspot.com/2009/10/star-pathroute-finding-javascript-code.html and now I'm using this library for path finding. And with this library, I'm trying write a simple test, but stuck with one problem. I'm now done when in HTML5 canvas screen click with mouse show path until my mouse.x and mouse.y. Here is a screenshot - http://oi46.tinypic.com/14qxrl.jpg (Pink square: Player, Orange squares: path until my mouse.x/mouse.y) Code how I'm drawing the orange squares until my mouse.x/mouse.y is: 'http://pastebin.com/bfq74ybc (Sorry I do not understand how upload code in my post) My problem is I do not understand how to move my player until path goal. I've tried: 'http://pastebin.com/nVW3mhUM But with this code my player is not beung drawn.(When I run the code, player.x and player.y are equals to 0 and when I click with the mouse I get the path player blink and disappear) Maybe anyone know how to solve this problem? And I'm very very very sorry for my bad English language. :)

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• Rails: Law of Demeter Confusion

  - by user2158382

  I am reading a book called Rails AntiPatterns and they talk about using delegation to to avoid breaking the Law of Demeter. Here is their prime example: They believe that calling something like this in the controller is bad (and I agree) @street = @invoice.customer.address.street Their proposed solution is to do the following: class Customer has_one :address belongs_to :invoice def street address.street end end class Invoice has_one :customer def customer_street customer.street end end @street = @invoice.customer_street They are stating that since you only use one dot, you are not breaking the Law of Demeter here. I think this is incorrect, because you are still going through customer to go through address to get the invoice's street. I primarily got this idea from a blog post I read: http://www.dan-manges.com/blog/37 In the blog post the prime example is class Wallet attr_accessor :cash end class Customer has_one :wallet # attribute delegation def cash @wallet.cash end end class Paperboy def collect_money(customer, due_amount) if customer.cash < due_ammount raise InsufficientFundsError else customer.cash -= due_amount @collected_amount += due_amount end end end The blog post states that although there is only one dot customer.cash instead of customer.wallet.cash, this code still violates the Law of Demeter. Now in the Paperboy collect_money method, we don't have two dots, we just have one in "customer.cash". Has this delegation solved our problem? Not at all. If we look at the behavior, a paperboy is still reaching directly into a customer's wallet to get cash out. EDIT I completely understand and agree that this is still a violation and I need to create a method in Wallet called withdraw that handles the payment for me and that I should call that method inside the Customer class. What I don't get is that according to this process, my first example still violates the Law of Demeter because Invoice is still reaching directly into Customer to get the street. Can somebody help me clear the confusion. I have been searching for the past 2 days trying to let this topic sink in, but it is still confusing.

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• What is the safest way to remove a swap partition?

  - by user212062

  I am running Ubuntu 12.04 on a 64-bit HP laptop with a 16 GB flash drive. I do not have a working hard drive right now. When I installed Ubuntu, I created a 2 GB swap partition on sdb1. I have since learned that swap partitions are generally a bad idea on flash drives, so I would like to use my swap space for my other partitions. You can see my partition scheme in the link below. I have read that I just have to comment sdb1 out of the fstab file, boot from a GParted live CD, select swapoff for sdb1, delete/merge with other partition, and everything's good. But, I've also read that messing with sdb1 can change the UUID of sdb2 or sdb3 and cause problems. Is this true? Does initramfs use swap at all? Also, when I get Ubuntu running on my laptop with an internal hard drive, does the swap partition help that much? I have 6 GB of DDR3. Does the rule of 1.5xActual RAM still apply? It seems like quite a bit to me. Thanks for the help! UPDATE: I have removed swap. The process I followed is: Right click swap partition in GParted and selected swapoff. Used # to comment the swap partition out of fstab. I tried to boot from a live GParted CD, but I kept getting an error, so I ran GParted in Ubuntu. Deleted swap partition in GParted. Unmounted /windows. Expanded /windows to take the remaining space. Mounted /windows. The / and /windows partitions each kept their own names and UUIDs, and everything is running fine. I have never seen any swap space being used before, and I don't intend to use the hibernate function, so I think removing swap was a good idea.

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• Good 2D Platformer Physics

  - by Joe Wreschnig

  I have a basic character controller set up for a 2D platformer with Box2D, and I'm starting to tweak it to try to make it feel good. Physics engines have a lot of knobs to tweak, and it's not clear to me, writing with a physics engine for the first time, which ones I should use. Should jumping apply a force for several ticks? An impulse? Directly set velocity? How do I stop the avatar from sticking to walls without taking away all its friction (or do I take away all the friction, but only in the air)? Should I model the character as a capsule? A box with rounded corners? A box with two wheels? Just one big wheel? I feel like someone must have done this before! There seem to be very few resources available on the web that are not "baby's first physics", which all cut off where I'm hoping someone has already solved the issues. Most examples of physics engines for platformers have floaty-feeling controls, or in-air jumps, or easily exploitable behavior when temporary penetration is too high, etc. Some examples of what I mean: A short tap of jump jumps a short distance; a long tap jumps higher. Short skidding when stopping or reversing directions at high velocity. Standing stably on inclines (but maybe sliding down them when ducking). Analog speed when using an analog controller. All the other things that separate good platformers from bad platformers. Dare I suggest, stable moving platforms? I'm not really looking for "hey, do this." Obviously, the right thing to do is dependent on what I want in the game. But I'm hoping someone somewhere has gone through the possibilities and said "well technique A does feature X well, technique B does Y well, but that doesn't work with C", or has some worked examples beyond "if (key == space) character.impulse(0, 1)"

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• Ubuntu boot problem/unity failure

  - by Kenny

  So here I am sitting in a big pile of muck...over the last 2 days things have just been going from bad to worse with version of Ubuntu 12.10. So 2 days ago I was fiddling around with kismet and airmon-ng. I had added a bunch of libraries, I remember adding GTK+, Glib, Pango, etc. After restarting the other day my desktop opened fine but my background was changed to the default and none of my files on the desktop were visible and the top bar and side bar were not visible or functioning. The window managers were still working. I then tried reinstalling my nvidia drivers to see if that would change anything, it did not. Then after doing some searching online I found something that suggested I try deleting the file "libgtk-3.so.0". I deleted this and tried to restart the computer. Upon restart, I was greeted by a black screen with some writing saying something about -starting clamAV [OK] -problem with Apache Server could not verify correct...something... - checking battery state [ok]. After it gets to battery state it just stops and sits there indefinitely. So to sum, I cannot login to ubuntu because it just sits at this black screeen. If anyone has any idea as to what is going on and how to fix it please let me know. Thanks!

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