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• Resolution independent physics

  - by user46877

  I'm making a game like Doodlejump but don't know how to make the physics scale on multiple resolutions. I also can't find anything related to this on Google. Right now I'm scaling the game using letterboxing and tested scaling the jump height with this code: gravity = graphics.getHeight() * 0.001f; jumpVel = graphics.getHeight() * -0.04f; ... velY += gravity; y += velY; But if I test this on my smartphone or emulator with different resolutions, I always get a slightly different jump height. I know that Farseer is resolution independent. How can I replicate this in my game? Thanks in advance.

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• Resources for improving your comprehension of recursion?

  - by Andrew M

  I know what recursion is (when a patten reoccurs within itself, typically a function that calls itself on one of its lines, after a breakout conditional... right?), and I can understand recursive functions if I study them closely. My problem is, when I see new examples, I'm always initially confused. If I see a loop, or a mapping, zipping, nesting, polymorphic calling, and so on, I know what's going just by looking at it. When I see recursive code, my thought process is usually 'wtf is this?' followed by 'oh it's recursive' followed by 'I guess it must work, if they say it does.' So do you have any tips/plans/resources for building up your skills in this area? Recursion is kind of a wierd concept so I'm thinking the way to tackle it may be equally wierd and inobvious.

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• Most underestimated programming tool

  - by Anto

  We have many great tools which helps a lot when programming, such as good programmers text editors, IDEs, debuggers, version control systems etc. Some of the tools are more or less "must have" tools for getting the job done (e.g. compilers). There are still always tools which do help a lot, but still don't get so much attention, for various reasons, for instance, when they were released, they were ahead of their time and now are more or less forgotten. What type of programming tool do you think is the most underestimated one? Motivate your answer.

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• Custom per domain CSS in Internet Explorer

  - by Damiqib

  We have an old web app, which would be much more usable if it could be visually tweaked a bit. Being in a corporate environment - IE (always using the latest version) is all I can use. Also app in question being 3rd-party - there's no way to change it's own CSS files. Is there a way to use per domain injected custom CSS in internet Explorer. Let's say I want to change the background-color of domain http://oldapp.localintranet/ - is there any way to make this happen? Place to put a custom.css-file? With an add-on/extension?

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• Google I/O 2010 - Tips and tricks for Google Earth API and KML

  Google I/O 2010 - Tips and tricks for Google Earth API and KML Google I/O 2010 - Mapping in 3D: Tips and tricks for Google Earth API and KML Geo 201 Josh Livni, Mano Marks Google Earth and the Earth API can handle a tremendous amount of data. But you always have more. We will talk about integrating large datasets efficiently, coding for optimal performance, and taking advantage of advanced features in KML and the Earth API. For all I/O 2010 sessions, please go to code.google.com From: GoogleDevelopers Views: 14 0 ratings Time: 01:01:18 More in Science & Technology

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• Printing multiple pages per sheet doesn't work

  - by Ricky Robinson

  In Ubuntu 12.04, I added a network printer which I had previously used without any problems on a different machine (with the same release of Ubuntu). Now, with the default generic driver installed, printing multiple pages per sheet from evince doesn't work properly. If I select 2 per sheet, be it long or short edge, it always prints 4. Why is this? It used to happen with non-pdf documents in the past, like from a browser. My workaround was to print to pdf file and then print the pdf itself. Now I'm clueless... Edit: the same happens with a different network printer, in which I installed the driver specific to its particular model.

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• Designing Algorithm Flowchart Application

  - by l46kok

  I need to develop an GUI application in C# where users can freely add conditional/statement blocks on the algorithm flowchart like the one shown below. By freely, I mean users can add a block on wherever the arrows are. I'm having some problems brainstorming how to approach this problem, especially what to choose for my datastructure to store the blocks. I was thinking LinkedList since everything follows a linear fashion and every node always has a head and tail, but the If/Else block (ba) has two branches (heads) to store, so this complicates things a little bit. How would a smart one approach problems like this? My apologies if this question isn't suited for Programmers stackexchange, but this is more of a conceptual problem rather than implementation problem so I figured this place was appropriate for the question.

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• What's the best practice for async APIs that return futures on Scala?

  - by Maurício Linhares

  I have started a project to write an async PostgreSQL driver on Scala and to be async, I need to accept callbacks and use futures, but then accepting a callback and a future makes the code cumbersome because you always have to send a callback even if it is useless. Here's a test: "insert a row in the database" in { withHandler { (handler, future) => future.get(5, TimeUnit.SECONDS) handler.sendQuery( this.create ){ query => }.get( 5, TimeUnit.SECONDS ) handler.sendQuery( this.insert ){ query => }.get( 5, TimeUnit.SECONDS ).rowsAffected === 1 } } Sending the empty callback is horrible but I couldn't find a way to make it optional or anything like that, so right now I don't have a lot of ideas on how this external API should look like. It could be something like: handler.sendQuery( this.create ).addListener { query => println(query) } But then again, I'm not sure how people are organizing API's in this regard. Providing examples in other projects would also be great.

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• Where can I get a cheap database, no web hosting needed

  - by PhilipK

  I'm building an application which requires a fairly small online MySQL database. I don't need any web hosting. What are some cheap options for an online database? *Edit(a bit more about what I'll be using it for) The database itself is very small it contains market statistics for 5 weeks of time. Once a week the data will be updated, so that it always contains the most recent 5 weeks. Then I will use the data in that to create an XML file which is generated with PHP. The XML file will need to be accessed hundreds-thousands of times per month.*

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• Download Speed is 0.12 Mbps when tested with servers in U.S, but it is 0.76 Mbps when tested with local servers, normal? [closed]

  - by Graviton

  Feeling that my ISP is cheating my money ( My subscription package is 1 Mbps), I did a speed test on my internet connection using www.speedtest.net. I tried to test the connection speed on two servers, one local ( Malaysia), another in U.S. I found that while the upload speed remain constant, but the download speed is different; 0.76 Mbps for servers in Malaysia, and 0.12 Mbps for servers in U.S. I called the ISP, and they blamed it on the intercontinental signal lost. But how can it be that the speed differs by that much? If it really differs by that much than we should always take a grain of salt of what is advertised as the broadband speed because the advertised speed is not the speed we are getting. No?

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• Buying a parked domain if the contact email bounces

  - by Mala

  I'm trying to buy a domain which is parked, but the contact email address listed on the page itself bounces. I looked up the WHOIS data and there are no email addresses or phone numbers listed. There are way too many hits on facebook / linkedin to try just searching for the name. What recourses do I have to try to get into contact with the owner? UPDATE: Hosted on the same IP are 206 identical "parked" pages, whose sole difference is the domain and the email address (always "info@[domain].it"): http://www.bing.com/search?q=ip%3A151.1.48.220 Whois info shows contact information for none (that I sampled) but all with different names o_O

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• Bitdefender Safebox Offers 2GB Free Storage for Android Users

  - by Jason Fitzpatrick

  Android: If you’re always on the lookout for new–and free!–cloud storage solutions, security company BitDefender has a new cloud service for Android uers. Safebox accounts come with a free 2GB storage to get you started. For those of you in the “You can never have enough backups!” camp, Bitdefender’s Safebox is a new offering (currently only available for PC/Android setups) on the remote-storage market. Free personal accounts come with 2GB of storage which is on par with other cloud storage providers. If you’re looking for cloud storage with the maximum number of features and heavy third-party support you’ll want to stick with a well established player like Dropbox. If you’re just looking for some extra storage for overflow media or some redundancy for your current backup solution, Safebox is a viable storage solution. Bitdefender Safebox [via Addicted Tips] Make Your Own Windows 8 Start Button with Zero Memory Usage Reader Request: How To Repair Blurry Photos HTG Explains: What Can You Find in an Email Header?

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• Solid principles vs YAGNI

  - by KeesDijk

  When do the SOLID principles become YAGNI. As programmers we make trade-off's all the time, between complexity, maintainabillity, time to build and so forth.Amongst others. two of the smartest guidelines for making choices are in my mind the SOLID principles and YAGNI. If you don't need it, dont build it and keep it clean. Now for example when i watch the dimecast series on SOLID I see it start out as a fairly simple programm and ending up prettty complex (end yes complexity is also in the eye of the beholder) but it still makes me wonder, when do SOLID principles turn into something you don't need. All solid principles are ways of working that enable use te make changes at a later stage. But what if the problem to solve is a pretty simple one and it's a through away application, than what ? Or are the SOLID principles something that apply always ?

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• Single database, multiple system dependency

  - by davenewza

  Consider an environment where we have a single, core database, with many separate systems using this one database. This leads to all of these systems have a common dependency, which ultimately introduces coupling between them. This means that we cannot always evolve systems independently of each other. Structural changes to the database (even if only intended for one, particular system), requires a full sweep test of ALL systems, and may require that other systems be 'patched' and subsequently released. This is especially tricky when you want to have separate teams working on different projects. What is a good 'pattern' to help in avoiding such coupling? I would imagine that a database should be exclusively depended on by one system. If other systems require data for whatever reason, they should request such from an API service of some kind. A drawback of this approach which comes to mind is performance: routing data between high-throughput systems through service calls is much slower than through a database connection.

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• Fan control on Acer Aspire One D255 netbook

  - by AdamB

  I have Ubuntu netbook edition on my Acer Aspire One D255 netbook and I notice that I always hear the fan working at 100% despite the actual temperature. I run the sensors command its only at 13c, theres no reason why the fan needs to be running this hard at that temp. root@adam-netbook:~# sensors acpitz-virtual-0 Adapter: Virtual device temp1: +13.0°C (crit = +100.0°C) I'm guessing I may need some drivers in order to interact with the fan? Does anyone have any experience with this? It also seems that "sensors" may not be all that accurate, the temperature never seems to fluctuate.

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• JS and CSS caching issue: possibly .htaccess related

  - by adamturtle

  I've been using the HTML5 Boilerplate for some web projects for a while now and have noticed the following issue cropping up on some sites. My CSS and JS files, when loaded by the browser, are being renamed to things like: ce.52b8fd529e8142bdb6c4f9e7f55aaec0.modernizr-1,o7,omin,l.js …in the case of modernizr-1.7.min.js The pattern always seems to add ce. or cc. in front of the filename. I'm not sure what's causing this, and it's frustrating since when I make updates to those files, the same old cached file is being loaded. I have to explicitly call modernizr-1.7.min.js?v=2 or something similar to get it to re-cache. I'd like to scrap it altogether but it still happens even when .htaccess is empty. Any ideas? Is anyone else experiencing this issue?

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• Bash does not remember programs with non 0 exit status in history

  - by Amigable Clark Kant

  I enter a command. It fails. I press arrow up, modify something and enter it again ... hold it right there. It used to work like that. Now it's more like: I enter a command. It fails. I press arrow up, get the last command which didn't fail, likely "ls" or something useless and I type the whole thing again back by hand. What happened? It wasn't always like this. But it's quite some time since this behavior changed, I'll give you that. Some years ago, at least. How do I put some sanity back into my bash prompt?

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• Security of logging people in automatically from another app?

  - by Simon

  I have 2 apps. They both have accounts, and each account has users. These apps are going to share the same users and accounts and they will always be in sync. I want to be able to login automatically from one app to the other. So my solution is to generate a login_key, for example: 2sa7439e-a570-ac21-a2ao-z1qia9ca6g25 once a day. And provide a automated login link to the other app... for example if the user clicks on: https://account_name.securityhole.io/login/2sa7439e-a570-ac21-a2ao-z1qia9ca6g25/user/123 They are logged in automatically, session created. So here we have 3 things that a intruder has to get right in order to gain access; account name, login key, and the user id. Bad idea? Or should I can down the path of making one app an oauth provider? Or is there a better way?

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• Anti-aliasing changed after update (or something...)

  - by Mussnoon

  The anti-aliasing of my system (of GTK?) has gone weird after I did one of two things - do a system update, and install gimp 2.7 beta. See images: Before: After: Before: After: Here's the current rendering comparison between Chromium, Firefox and Opera (in that order): Does anyone know how I can get the old anti-aliasing back? As far as I can tell, I never did anything special to achieve that before. It has always been on the default settings since I installed Lucid few months ago. Update: I have tried different settings (even though I knew they were already at the "best" settings) in appearance fonts ( details) but, as expected, any change there only makes things worse.

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• OpenGL-ES: clearing the alpha of the FrameBufferObject

  - by MrDatabase

  This question is a follow-up to Texture artifacts on iPad How does one "clear the alpha of the render texture frameBufferObject"? I've searched around here, StackOverflow and various search engines but no luck. I've tried a few things... for example calling GlClear(GL_COLOR_BUFFER_BIT) at the beginning of my render loop... but it doesn't seem to make a difference. Any help is appreciated since I'm still new to OpenGL. Cheers! p.s. I read on SO and in Apple's documentation that GlClear should always be called at the beginning of the renderLoop. Agree? Disagree? Here's where I read this: http://stackoverflow.com/questions/2538662/how-does-glclear-improve-performance

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• FISL 12, Sao Jose Do Rio Preto, Brasilia, DFJUG, Goiania, and The Developers Conference, Sao Paolo

  - by arungupta

  Java EE 6/7 and GlassFish are visiting multiple cities in Brazil: Jun 26 - Jul 2 FISL 12, Porto Alegre Jul 3 Sao Jose Do Rio Preto JUG Jul 4 - 5 DFJUG Taguatinga, Brasilia and other venues Jul 6 - 7 Goiania JUG and other venues Jul 8 - 9 The Developers Conference, Sao Paolo Even though my main focus will be Java EE 6/7 and GlassFish but feel free to ask any question. There are several speakers from Oracle at FISL so stop by at the booth and talk to us. @paulojeronimo, with the help of the local community, organized a 10k run on the morning of Jul 5th. So please feel free to run along, should be fun. @raphaeladrien mentioned about some nice parks near my hotel in Goiania so you'll find me running there as well. There will be interesting discussions around different Web frameworks in Goiania. And then there are always 4 things to not miss in Brazil - Churrascaria, Guarana, Coffee, Caipirinha. Where will I see you ?

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• FISL 12, Sao Jose Do Rio Preto, Brasilia, DFJUG, Goiania, and The Developers Conference, Sao Paolo

  - by arungupta

  Java EE 6/7 and GlassFish are visiting multiple cities in Brazil: Jun 26 - Jul 2 FISL 12, Porto Alegre Jul 3 Sao Jose Do Rio Preto JUG Jul 4 - 5 DFJUG Taguatinga, Brasilia and other venues Jul 6 - 7 Goiania JUG and other venues Jul 8 - 9 The Developers Conference, Sao Paolo Even though my main focus will be Java EE 6/7 and GlassFish but feel free to ask any question. There are several speakers from Oracle at FISL so stop by at the booth and talk to us. @paulojeronimo, with the help of the local community, organized a 10k run on the morning of Jul 5th. So please feel free to run along, should be fun. @raphaeladrien mentioned about some nice parks near my hotel in Goiania so you'll find me running there as well. There will be interesting discussions around different Web frameworks in Goiania. And then there are always 4 things to not miss in Brazil - Churrascaria, Guarana, Coffee, Caipirinha. Where will I see you ?

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• Why partners should visit the new AutoVue Knowledge Zone

  - by [email protected]

  Learn more about AutoVue and connect with your peers to distinguish your offerings, seize opportunities, and to increase your sales! Explore the latest releases, integration solution offerings, marketing assets, partner enablement tools, events and latest partner initiatives by clicking through the tabs - Why Partner, Develop, Sell, and Connect. Knowledge Zones are designed to accelerate the partner's knowledge about Oracle solutions, as well as provide new opportunities to collaborate with the entire Oracle partner ecosystem. The AutoVue Knowledge Zone, launched in March 2010, is continuously being updated with the latest information to better equip and enable our partners to sell AutoVue solutions. Get all the information you always wanted to convert your sales opportunities into wins. Check out and bookmark the AutoVue Knowledge Zone now!

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• Is there a language between C and C++?

  - by Robert Martin

  I really like the simple and transparent nature of C: when I write C code I feel unencumbered by "leaky abstractions" and can almost always make a shrewd guess as to the assembly I'm producing. I also like the simple, familiar syntax for C. However, C doesn't have these simple, helpful doodads that C++ offers like classes, simplified non-cstring handling, etc. I know that it's all possible to implement in C using jump tables and the like, but that's a bit wordy at times, and not very type-safe for various reasons. I'm not a fan of the over-emphasis on objects in C++, though, and I'm gun shy of the 'new' operator and the like. C++ seems to have just a few too many hiccups to, for instance, be used as a system programming language. Does there exist a language that sits between C and C++ on the scale of widgets and doodads? Disclaimer: I mean this as purely a factual question. I do not intend to anger you because I don't share your view that C{,++} is good enough to do whatever I'm planning.

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• ADF Sessions at RMOUG this week

  - by shay.shmeltzer

  If you are attending the RMOUG conference this week, you might be interested in checking out some of the sessions we are doing about Oracle ADF:Lynn is delivering:The Fusion Development Platform - Wed at 9:00 (404)Put Your Good Taste Into Action: How to Skin ADF Faces Rich Client Applications - Wed 5:00 (4 c/d)Shay is delivering:From SQL to Rich Web Data Visualization - The Fast Route - Thu at 9:00 (404)Adding Mobile and Web 2.0 UIs to Existing Applications - The Fusion Way - Thu at 10:15 (404)There are also lots of ADF related sessions delivered by customers and partners including:Drinking the Kool-Aid - My Journey to Becoming an ADF BelieverCase Study: Performance Tuning New ADF Applications Using Oracle Application Testing Suite (ATS)Oracle ADF & JDeveloper: Coming of AgeHello Worldwide Web: Your First JSF in JDeveloperMore details see the schedule here.If you are using ADF already, please drop by and let us know what you think. We are always looking for user feedback.

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