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• Collision detection of player larger than clipping tile

  - by user1306322

  I want to know how to check for collisions efficiently in case where the player's box is larger than a map tile. On the left is my usual case where I make 8 checks against every surrounding tile, but with the right one it would be much more inefficient. (picture of two cases: on the left is the simple case, on the right is the one I need help with) http://i.stack.imgur.com/k7q0l.png How should I handle the right case?

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• Backlight screen flickering on a Sony Vaio VPCYB15AL

  - by Mario Zavala

  I've just installed Ubuntu 11.10, and everything went just now when the computer got into suspension, when it got back the screen started flickering, specially on the dashboard, it trends to disappear when i turn down the backlight, at first it was fixed by rebooting the system and now, every time that I start Ubuntu as soon as the desktod loads it starts flickering again, please help! I have a Sony VAIO VPCYB15AL AMD Dual Core E350 with an ATI HD 6310.

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• how to reinstall google chrome?

  - by ning

  i already downloaded google-chrome-stable_current_i386.deb after that i type this on terminal sudo apt-get install libcurl3 libnspr4-0d libxss1 cd Downloads sudo dpkg -i google-chrome-stable_current_i386.deb(i got an error every time i run this)? i dunno what happens, but i just see that on internet while im searching google chrome for linux. forgot to say 'this is my first time in ubuntu ^^,expect me here always on askubuntu^^ btw, is there a full tutorial on how to install or basic installation about ubuntus,it will help me much^^ thx

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• Get Free Website Content That is Better Than Your Competitor's

  What most folks are yet to fully appreciate is that the real competition for search engine traffic is for the website that produces the best and most useful content. Should be pretty obvious if you think about what you do every day when searching for information online.

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• [News] Les 60 outils .NET que vous devriez conna?tre

  Le site de blog webdistortion.com publie une liste de 60 outils que tout d?velopper .NET doit conna?tre : "Every good developer knows never to re-invent the wheel, especially if there is software out there that has been tested by others, and has an established track record. As a developer using the .NET framework I?ve found some of these libraries invaluable, so I?m sharing them for some of the other dev?s out there with a brief outline of how to use."

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• Are separate business objects needed when persistent data can be stored in a usable format?

  - by Kylotan

  I have a system where data is stored in a persistent store and read by a server application. Some of this data is only ever seen by the server, but some of it is passed through unaltered to clients. So, there is a big temptation to persist data - whether whole rows/documents or individual fields/sub-documents - in the exact form that the client can use (eg. JSON), as this removes various layers of boilerplate, whether in the form of procedural SQL, an ORM, or any proxy structure which exists just to hold the values before having to re-encode them into a client-suitable form. This form can usually be used on the server too, though business logic may have to live outside of the object, On the other hand, this approach ends up leaking implementation details everywhere. 9 times out of 10 I'm happy just to read a JSON structure out of the DB and send it to the client, but 1 in every 10 times I have to know the details of that implicit structure (and be able to refactor access to it if the stored data ever changes). And this makes me think that maybe I should be pulling this data into separate business objects, so that business logic doesn't have to change when the data schema does. (Though you could argue this just moves the problem rather than solves it.) There is a complicating factor in that our data schema is constantly changing rapidly, to the point where we dropped our previous ORM/RDBMS system in favour of MongoDB and an implicit schema which was much easier to work with. So far I've not decided whether the rapid schema changes make me wish for separate business objects (so that server-side calculations need less refactoring, since all changes are restricted to the persistence layer) or for no separate business objects (because every change to the schema requires the business objects to change to stay in sync, even if the new sub-object or field is never used on the server except to pass verbatim to a client). So my question is whether it is sensible to store objects in the form they are usually going to be used, or if it's better to copy them into intermediate business objects to insulate both sides from each other (even when that isn't strictly necessary)? And I'd like to hear from anybody else who has had experience of a similar situation, perhaps choosing to persist XML or JSON instead of having an explicit schema which has to be assembled into a client format each time.

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• Traditional POS is Dead

  - by David Dorf

  Traditional POS is dead -- I've heard that one before. Here's an excerpt from Joe Skorupa's blog over at RIS where he relayed ten trends that were presented at NRF. 7. Mobile POS signals death of traditional POS. Shoppers don't love self-checkout, but they prefer it to long queues or dealing with associates. Fixed POS is expensive and bulky. Mobile POS frees floor space for other purposes and converts associates from being cashiers to being sales assistants that provide new levels of customer service and incremental basket sales. In addition to unplugging the POS, new alternatives are starting to take hold - thin client, POS as a service, and replacing POS software with e-commerce platforms. I'll grant that in some situations for some retailers there might be an opportunity to to ditch the traditional POS, but for the majority of retailers that's just not practical. Take it from a guy that had to wake up at 3am after every Thanksgiving to monitor POS systems across the US on Black Friday. If a retailer's website goes down on Black Friday, they will take a significant hit. If a retailer's chain-wide POS system goes down on Black Friday, that retailer will cease to exist. Mobile POS works great for Apple because the majority of purchases are one or two big-ticket items that don't involve cash. There's still a traditional POS in every store to fall back on (its just hidden). Try this at home: Choose your favorite e-commerce site and add an item to the cart while timing how long it takes. Now multiply that by 15 to represent the 15 items you might buy at store like Target. The user interface isn't optimized for bulk purchases, and that's how it should be. The webstore and POS are designed for different purposes. Self-checkout is a great addition to POS and so is mobile checkout. But they add capabilities to POS, not replace it. Centralized architectures, even those based in the cloud, are quite viable as long as there's resiliency in the registers. You cannot assume perfect access to the network, so a POS must always be able to sell regardless of connectivity. Clearly the different selling channels should be sharing common functionality. Things like calculating tax, accepting coupons, and processing electronic payments can be shared, usually through a service-oriented architecture. This lowers costs and providers greater consistency, both of which help retailers. On paper these technologies look really good and we should continue to push boundaries, but I'm not ready to call the patient dead just yet.

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• Latest Techniques in Web Development

  Growth and expansion is mandatory for every business entity. In this time period of e-commerce and Internet, having a web portal has become a crucial and essential weapon that is useful in promoting your business entity, products, and services. You need to develop and grow your web portals continuously to get more and more visibility and attention.

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• How Does Microsoft Office 2010 Compare?

  The release of the new Microsoft Office suite isn';t the most exciting thing in the world, the fact that it is used nearly every day on my work computer doesn';t help matters. Nevertheless, I thought i... [Author: Chris Holgate - Computers and Internet - April 14, 2010]

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• Player Movement DirectX

  - by SullY

  I'm reading on a Book that's about Gamedevelopment with C++ and DirectX 9. There is something that interrests me: It says that playermovements are increasing with the power of the CPU. Becouse a faster CPU will move the player with every frame ( better CPU = better FPS ) To bypass it, it says you have just to multiplicate time*movementfactor . I'd like to know is there an another way to bypass it ?

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• How does Google+ embed link works?

  - by Drake

  I am trying to understand how does embed link works in Google+ Stream. I manage a site and usually every post contains some text and at least an image. But when I try to embed the link to a certain article on my blog the embed feature does not show the article text and images, but instead it shows the header image of my site plus some other header text content. Do you know how should I tag or code the article part so that Google+ parser recognize the right thing I want to show?

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• Storing a looong lookup table

  - by inquisitive

  Background The product i am working on has a very long lookup-table. the table contains static data and cannot be auto generated. there are about 500 rows and 10 columns. columns have mostly integers and strings. to complicate the matters, there are actually two such tables. every row in table-1 maps to zero-or-more rows in table-2. we use an SQLite database with two tables. the product installer places the SQLite file in the installation directory. the application is written in dot-net and we use ADO to load the data once on startup. now, the lookup table grows. in each release a month, we add about 10 new entries existing entries are adjusted. every release we fine tune existing entries. The problem a team of (10) developers work on the lookup table. Code goes in the SVN, but the little devil the SQLite does not. this prevents multiple developers to work on it. we do take regular backups of the file, but proper versioning is not possible. we never know who did the breaking change. the worse thing is we dont know if there is any change at all. diff'ing databases is tedious if not impossible. the tables are expected to grow quite large in years to come and we would need developers to work in parallel on it. the data is business critical. we need to be able to audit changes made to it. Question What would be a solution for the problems outlines above? one idea was to transform the whole thing to XML and treat it like just another source file. that way SVN can do the versioning and we can work in parallel. but the data shows relational behavior. with XML we loose the unique and foreign-key constraints. also we cant query it with sql like ease. any help here will be appreciated.

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• After Re-opening Laptop, Programs Blink with Each Keystroke, Ubuntu 12.04, Dell Latitude D620

  - by Calhan

  I'm running Ubuntu version 12.04 on Dell D620 laptop and have been for months. Everything has been working fine until a week ago, when suddenly every time I close the laptop and open it again, the program in use blinks each time I make a keystroke. Only the program blinks, not the whole screen. Rebooting solves the issue until I close the lid again. I have installed all the updates recommended in the package manager. Clues?

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• Learning by doing (and programming by trial and error)

  - by AlexBottoni

  How do you learn a new platform/toolkit while producing working code and keeping your codebase clean? When I know what I can do with the underlying platform and toolkit, I usually do this: I create a new branch (with GIT, in my case) I write a few unit tests (with JUnit, for example) I write my code until it passes my tests So far, so good. The problem is that very often I do not know what I can do with the toolkit because it is brand new to me. I work as a consulant so I cannot have my preferred language/platform/toolkit. I have to cope with whatever the customer uses for the task at hand. Most often, I have to deal (often in a hurry) with a large toolkit that I know very little so I'm forced to "learn by doing" (actually, programming by "trial and error") and this makes me anxious. Please note that, at some point in the learning process, usually I already have: read one or more five-stars books followed one or more web tutorials (writing working code a line at a time) created a couple of small experimental projects with my IDE (IntelliJ IDEA, at the moment. I use Eclipse, Netbeans and others, as well.) Despite all my efforts, at this point usually I can just have a coarse understanding of the platform/toolkit I have to use. I cannot yet grasp each and every detail. This means that each and every new feature that involves some data preparation and some non-trivial algorithm is a pain to implement and requires a lot of trial-and-error. Unfortunately, working by trial-and-error is neither safe nor easy. Actually, this is the phase that makes me most anxious: experimenting with a new toolkit while producing working code and keeping my codebase clean. Usually, at this stage I cannot use the Eclipse Scrapbook because the code I have to write is already too large and complex for this small tool. In the same way, I cannot use any more an indipendent small project for my experiments because I need to try the new code in place. I can just write my code in place and rely on GIT for a safe bail-out. This makes me anxious because this kind of intertwined, half-ripe code can rapidly become incredibly hard to manage. How do you face this phase of the development process? How do you learn-by-doing without making a mess of your codebase? Any tips&tricks, best practice or something like that?

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• How to explain bad software to non-technical people?

  - by mtutty

  In discussing software development with non-technical people (customers, business owners, project sponsors, etc.), I often resort to analogies and metaphors. It's relatively easy and effective to use a "house" or other metaphor for describing the size and complexity of new development. However, we often inherit someone else's code or data, and this approach doesn't seem to hold up as well when trying to explain why we're gutting something that already seems to work. Of course we can point to cycle time and cost to be saved in the future but this generally means nothing to business folks. I know doctors can say "just take this pill," but I'm not sure that software devs have the same authority. Ideas? EDIT: Let me add a bit to the discussion. The specific project I'm talking about has customers that don't realize (or care) about specific aspects of the system we're retiring (i.e., they think it was just fine): The system would save a NEW RECORD every time someone updated a field The system contained tables for reference data. These tables had new records added every day, even though they were duplicates of previous records. And there was no way to tie the reference data used for a particular case at the time it was closed. This is like 99% of the data in the old system. The field NAMES also have spaces, apostrophes and other inappropriate characters in them, making everything harder to work with. In addition to the incredible amount of duplicate data, they have around 1000 XLS files with data they want added to the system. Previously, they would do a spreadsheet for each case in the database, IN ADDITION TO what they typed into the database. Getting rid of this old, unneeded information and piping in the XLS data comprises about 80% of the total project effort, and was not something we could accurately predict. I'm trying to find a concrete way to describe how bad this thing was, mostly so that the customer will understand why the migration process has been so time-consuming. The actual coding was done pretty quickly and the new system works fine, but without the old data they won't be happy. Sorry to get into the weeds, but most of the answers I've seen so far are pretty basic scope/schedule/cost things. I've been doing this for 15 years, so this really is more of a reflective, philosophical question - but without some of the details it can be difficult to really appreciate the awful beauty of this problem.

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• Best SEO Tools For Keyword Research From Google

  Keyword research is undoubtedly the cornerstone of every SEO campaign. This is perhaps one of the few areas in SEO where you simply can't do without SEO tools. Here are 4 most effective keyword research tools from Google to help you succeed with your SEO.

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• Is there a file browser like an ER diagram for viewing website physical path structures?

  - by EASI

  I wish to know if there is a tool like this to replace windows explorer and similar in the work of managing files, specially those web-site structures that sometimes can get very big. I am asking it here because I sincerely do not know what terms to use in Google to find anything like it. It is like a diagram, but showing the tree directory structure and the contents of every folder at the same time, not just the one that is in focus.

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• Ultimate Web Traffic - Avoid These SEO Blunders to Experience That!

  It is the ultimate goal of every website to receive huge numbers of visitors because without that everything else is pointless. To achieve this, websites use the most powerful marketing tools and techniques. It is a known fact that Search Engine Optimization is the best and most widely used method to draw crowds to your website.

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• How to cleanly add after-the-fact commits from the same feature into git tree

  - by Dennis

  I am one of two developers on a system. I make most of the commits at this time period. My current git workflow is as such: there is master branch only (no develop/release) I make a new branch when I want to do a feature, do lots of commits, and then when I'm done, I merge that branch back into master, and usually push it to remote. ...except, I am usually not done. I often come back to alter one thing or another and every time I think it is done, but it can be 3-4 commits before I am really done and move onto something else. Problem The problem I have now is that .. my feature branch tree is merged and pushed into master and remote master, and then I realize that I am not really done with that feature, as in I have finishing touches I want to add, where finishing touches may be cosmetic only, or may be significant, but they still belong to that one feature I just worked on. What I do now Currently, when I have extra after-the-fact commits like this, I solve this problem by rolling back my merge, and re-merging my feature branch into master with my new commits, and I do that so that git tree looks clean. One clean feature branch branched out of master and merged back into it. I then push --force my changes to origin, since my origin doesn't see much traffic at the moment, so I can almost count that things will be safe, or I can even talk to other dev if I have to coordinate. But I know it is not a good way to do this in general, as it rewrites what others may have already pulled, causing potential issues. And it did happen even with my dev, where git had to do an extra weird merge when our trees diverged. Other ways to solve this which I deem to be not so great Next best way is to just make those extra commits to the master branch directly, be it fast-forward merge, or not. It doesn't make the tree look as pretty as in my current way I'm solving this, but then it's not rewriting history. Yet another way is to wait. Maybe wait 24 hours and not push things to origin. That way I can rewrite things as I see fit. The con of this approach is time wasted waiting, when people may be waiting for a fix now. Yet another way is to make a "new" feature branch every time I realize I need to fix something extra. I may end up with things like feature-branch feature-branch-html-fix, feature-branch-checkbox-fix, and so on, kind of polluting the git tree somewhat. Is there a way to manage what I am trying to do without the drawbacks I described? I'm going for clean-looking history here, but maybe I need to drop this goal, if technically it is not a possibility.

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• Unable to download a file using drag&drop

  - by espectalll123

  I've been downloading images from the Internet doing drag&drop while holding the Ctrl key. Using Google Chrome, and of course Nautilus, it used to work fine. But I recently had problems with packages and now every time I do that a warning menu appears showing this message: The specified location is not supported Probably I removed the packaged which allowed me to download content... can anybody help me? Note: Downloading doing right-click works, but I use more drag&drop.

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• How do I toggle the wifi hardware switch for a Dell XPS 17 L702X?

  - by Sparhawk

  Every now and then, I disable my wireless via the menu icon in Ubuntu. Then, when I try to enable the wifi, it tells me that "wireless is disabled" or "wireless is disabled by hardware switch". There is a red icon on the F2 key that looks like a wireless icon, and in Windows, pressing the (red) Fn key and F2 toggles the wifi. This does not work in Ubuntu, leaving me no clear way to turn wifi back on. How can I restart wifi in Ubuntu?

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• Technique to Solve Hard Programming logic

  - by Paresh Mayani

  I have heard about many techniques which are used by developer/software manager to solve hard programming logic or to create flow of an application and this flow will be implemented by developers to create an actual application. Some of the technique which i know, are: Flowchart Screen-Layout Data Flow Diagram E-R Diagram Algorithm of every programs I'd like to know about two facts: (1) Are there any techniques other than this ? (2) Which one is the most suitable to solve hard programming logic and process of application creation?

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• System Settings and Software Center does not pull up after fresh install 11.10 amd64

  - by hydroparadise

  I've had a few install rounds with ubuntu ever since 8.04 and has worked flawlessly every time. However, for some reason, when I try to click either System Settings or Software Center, the icon pulses as if it were working to come up but never does. The same goes for System Settings. I would expect that a password dialog would appear, but nothing shows. Is there bug with 11.10 that didn't exist with 11.04?

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• Windows Security: is Microsoft innocent?

  <b>ZDNet UK:</b> "After all, it has become almost de rigueur in geek circles, especially amongst the non-Windows using Mac and Linux crowd, to blame every security mishap on Microsoft."

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• Preventing Users/Groups from accessing certain Domains

  - by ncphillips

  I have created a Study account which I use when doing anything school related work. It's purpose is to remove the distractions of my normal account, such as social media and news websites. I know /etc/hosts can be edited to block certain domains from being accessed, but this is for all Users, and I don't want to have to switch in and out of Admin to change it every time I want to focus. Is there any way to block these domains for specific Users or Groups?

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