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• Securely automount encrypted drive at user login

  - by Tom Brossman

  An encrypted /home directory gets mounted automatically for me when I log in. I have a second internal hard drive that I've formatted and encrypted with Disk Utility. I want it to be automatically mounted when I login, just like my encrypted /home directory is. How do I do this? There are several very similar questions here, but the answers don't apply to my situation. It might be best to close/merge my question here and edit the second one below, but I think it may have been abandoned (and therefore never to be marked as accepted). This solution isn't a secure method, it circumvents the encryption. This one requires editing fstab, which necessitates entering an additional password at boot. It's not automatic like mounting /home. This question is very similar, but does not apply to an encrypted drive. The solution won't work for my needs. Here is one but it's for NTFS drives, mine is ext4. I can re-format and re-encrypt the second drive if a solution requires this. I've got all the data backed up elsewhere.

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• How do I check on non-transparent pixels in a bitmapdata?

  - by Opoe

  I'm still working on my window cleaning game from one of my previous questions I marked a contribution as my answer, but after all this time I can't get it to work and I have to many questions about this so I decided to ask some more about it. As a sequel on my mentioned previous question, my question to you is: How can I check whether or not a bitmapData contains non transparent pixels? Subquestion: Is this possible when the masked image is a movieclip? Shouldn't I use graphics instead? Information I have: A dirtywindow movieclip on the bottom layer and a clean window movieclip on layer 2(mc1) on the layer above. To hide the top layer(the dirty window) I assign a mask to it. Code // this creates a mask that hides the movieclip on top var mask_mc:MovieClip = new MovieClip(); addChild(mask_mc) //assign the mask to the movieclip it should 'cover' mc1.mask = mask_mc; With a brush(cursor) the player wipes of the dirt ( actualy setting the fill from the mask to transparent so the clean window appears) //add event listeners for the 'brush' brush_mc.addEventListener(MouseEvent.MOUSE_DOWN,brushDown); brush_mc.addEventListener(MouseEvent.MOUSE_UP,brushUp); //function to drag the brush over the mask function brushDown(dragging:MouseEvent):void{ dragging.currentTarget.startDrag(); MovieClip(dragging.currentTarget).addEventListener(Event.ENTER_FRAME,erase) ; mask_mc.graphics.moveTo(brush_mc.x,brush_mc.y); } //function to stop dragging the brush over the mask function brushUp(dragging:MouseEvent):void{ dragging.currentTarget.stopDrag(); MovieClip(dragging.currentTarget).removeEventListener(Event.ENTER_FRAME,erase); } //fill the mask with transparant pixels so the movieclip turns visible function erase(e:Event):void{ with(mask_mc.graphics){ beginFill(0x000000); drawRect(brush_mc.x,brush_mc.y,brush_mc.width,brush_mc.height); endFill(); } }

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• How can I downgrade a system that accidentally had backports installed?

  - by Glyph

  I installed a fresh Ubuntu system. Somehow - possibly through my own error - the backports repository got enabled. Then I did several upgrades. I noticed that this happened when networking suddenly stopped working, "Network Settings" now has an "(alpha)" in the title bar, "System Settings" ? "Network" now displays an error dialog saying "The system network services are not compatible with this version". Now, I've disabled the backports repository, and I'd like to restore my system to its previously-functional state. My question is twofold: How do I determine which packages were installed from backports? Can I automatically re-install all those packages (and purge their configuration) to get back to a sensible state? If the answer to 2 is "no" I can probably manually purge some things and reinstall, but it would be nice to have it handled automatically. Update: It wasn't an update that broke the network; it was apt-get install indicator-network, which installed something called "connman" and removed network-manager and network-manager-gnome. Nevertheless I am leaving the question up, since I am still interested in how I can purge packages from a particular source after accidentally adding that source, and how I can determine which packages were installed from where.

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• Ubuntu unstable, showing awkward behavior

  - by Christophe De Troyer

  Let me start off by saying that this problem can't be described in such a way that allows me to find other topics, which have some relevance to this problem. That's why I created this question. In case this question might have been asked before, I apologize. So what is the problem: My computer (Intel Core I5 2500K - with HD3000 graphics -, 6 gb DDR, 1 SSD, 3 HDD's and an Asus P8Z68 mobo) runs Windows on the SDD. But I decided to give Ubuntu a chance to be my daily OS for basic needs since it's open source and I find it a handicap of not being able to work with it. I decided to run the windows installer and install Ubuntu 12.04 to my 320 Gb hdd which was not being used in my computer. After installing it and booting it, it worked great! I spent the rest of the day/night using it, and falling for it. Great, today I booted Ubuntu (I had the choice in the bootloader as I expected). It asked me for my login and it started logging in. Now, after a few (literally) minutes of letting it "boot" I tried determining the cause of this. What I've figured out so far: When I left click on my desktop it freezes completely for a few seconds I have something like tearing in the left side menu (in games, you know) when I move my mouse around It runs well when just hovering around with my mouse, but from the point I click on something it freezes. What have I tried? I ran a HD Tune diagnostic on the HDD but the performance seems to be very close to the stock values, so I'm taking it as a good HDD. I'm trying to get to the drivers update panel for Ubuntu, but with the state it's in, it's taking a lot of time.. Could anyone point me in a direction for troubleshooting this? I'm not really a noob at all, just when using Linux.. :) Thanks in advance! Christophe,

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• On what criteria should I evaluate domain registrars?

  - by jdotjdot89

  Though I've been a web developer for a fair amount of time, I am going for the first time to buy a few domain names. I have looked into the domains I'm going to buy and know that they're available, and I've been looking into which sellers to use. After doing a lot of research, the main ones I'm considering are 1&1, Namecheap, and Gandi. The problem is, when continuing to research, I'm not really sure what makes one domain seller distinct from another. I don't need much in the way of services--definitely not hosting, since I plan to use Heroku for that. I mainly only need the domain itself and DNS management, as well as possibly SSL certificates and WHOIS protection. Question: What makes one domain seller different from another? How can I go about evaluating which one is the best for me? Note: This question is not which domain seller is the best, but rather, what criteria can I use to evaluate them and rank one over another. I'm trying to find out what makes one domain seller different from another, since they all seem to be pretty similar to me right now.

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• How to handle multiple effect files in XNA

  - by Adam 'Pi' Burch

  So I'm using ModelMesh and it's built in Effects parameter to draw a mesh with some shaders I'm playing with. I have a simple GUI that lets me change these parameters to my heart's desire. My question is, how do I handle shaders that have unique parameters? For example, I want a 'shiny' parameter that affects shaders with Phong-type specular components, but for an environment mapping shader such a parameter doesn't make a lot of sense. How I have it right now is that every time I call the ModelMesh's Draw() function, I set all the Effect parameters as so foreach (ModelMesh m in model.Meshes) { if (isDrawBunny == true)//Slightly change the way the world matrix is calculated if using the bunny object, since it is not quite centered in object space { world = boneTransforms[m.ParentBone.Index] * Matrix.CreateScale(scale) * rotation * Matrix.CreateTranslation(position + bunnyPositionTransform); } else //If not rendering the bunny, draw normally { world = boneTransforms[m.ParentBone.Index] * Matrix.CreateScale(scale) * rotation * Matrix.CreateTranslation(position); } foreach (Effect e in m.Effects) { Matrix ViewProjection = camera.ViewMatrix * camera.ProjectionMatrix; e.Parameters["ViewProjection"].SetValue(ViewProjection); e.Parameters["World"].SetValue(world); e.Parameters["diffuseLightPosition"].SetValue(lightPositionW); e.Parameters["CameraPosition"].SetValue(camera.Position); e.Parameters["LightColor"].SetValue(lightColor); e.Parameters["MaterialColor"].SetValue(materialColor); e.Parameters["shininess"].SetValue(shininess); //e.Parameters //e.Parameters["normal"] } m.Draw(); Note the prescience of the example! The solutions I've thought of involve preloading all the shaders, and updating the unique parameters as needed. So my question is, is there a best practice I'm missing here? Is there a way to pull the parameters a given Effect needs from that Effect? Thank you all for your time!

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• Implementing the transport layer for a SIP UAC

  - by Jonathan Henson

  I have a somewhat simple, but specific, question about implementing the transport layer for a SIP UAC. Do I expect the response to a request on the same socket that I sent the request on, or do I let the UDP or TCP listener pick up the response and then route it to the correct transaction from there? The RFC does not seem to say anything on the matter. It seems that especially using UDP, which is connection-less, that I should just let the listeners pick up the response, but that seems sort of counter intuitive. Particularly, I have seen plenty of UAC implementations which do not depend on having a Listener in the transport layer. Also, most implementations I have looked at do not have the UAS receiving loop responding on the socket at all. This would tend to indicate that the client should not be expecting a reply on the socket that it sent the request on. For clarification: Suppose my transport layer consists of the following elements: TCPClient (Sends Requests for a UAC via TCP) UDPClient (Sends Requests for a UAC vid UDP) TCPSever (Loop receiving Requests and dispatching to transaction layer via TCP) UDPServer (Loop receiving Requests and dispatching to transaction layer via UDP) Obviously, the *Client sends my Requests. The question is, what receives the Response? The *Client waiting on a recv or recvfrom call on the socket it used to send the request, or the *Server? Conversely, the *Server receives my requests, What sends the Response? The *Client? doesn't this break the roles of each member a bit?

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• ArchBeat Link-o-Rama Top 20 for June 3-9, 2012

  - by Bob Rhubart

  The top twenty most popular links as shared via my social networks for the week of June 3-9, 2012. SOA Analysis within the Department of Defense Architecture Framework (DoDAF) 2.0 – Part II | Dawit Lessanu Driving from Business Architecture to Business Process Services | H. V. Ganesarethinam Book Review: Oracle Application Integration Architecture (AIA) Foundation Pack 11gR1: Essentials | Rajesh Raheja Oracle Enterprise Manager Ops Center 12c: Enterprise Controller High Availability (EC HA)| Anand Akela Integrating OBIEE 11g into Weblogic’s SAML SSO | Andre Correa Introducing Decision Tables in the SOA Suite 11g Business Rule component | Lucas Jellema EJB 3.1: Stateless Session Bean Deployed as .war, Dependency Injection, Asynchronous Methods | Frank Munz Educause Top-Ten IT Issues - the most change in a decade or more | Cole Clark Oracle VM RAC template - what it took | Wim Coekaerts WebCenter Content shared folders for clustering | Kyle Hatlestad CRUD Use Case Implementation and ADF Query Search | @AndrejusB Introducing Oracle Cloud | Larry Ellison Exalogic Webcast Series: Rethink Your Business Application Deployment Strategy BI Architecture Master Class for Partners - Oracle Architecture Unplugged Creating an Oracle Endeca Information Discovery 2.3 Application | Mark Rittman Eclipse DemoCamp - June 2012 - Redwood Shores, CA Oracle Cloud offering - What makes it unique? | Tom Laszewski Virtualization at Oracle - Six Part Series The right way to transform your business via the cloud | David Linthicum Protecting a WebCenter app with OAM 11g | Chris Johnson Thought for the Day "Programming without an overall architecture or design in mind is like exploring a cave with only a flashlight: You don't know where you've been, you don't know where you're going, and you don't know quite where you are." — Danny Thorpe Source: softwarequotes.com

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• Many small scripts, one repository or multiple?

  - by The Jug

  A co-worker and myself have run into an issue that we have multiple opinions on. Currently we have a git repository that we are keeping all of our cronjobs in. There are about 20 crons and they are not really related except for the fact that they are all small python scripts and essential for some activity. We are using a fabric.py file to deploy and a requirements.txt file to manage requirements for all of the scripts. Our issue is basically, do we keep all of these scripts in one git repository or should we be separating them out into their own repositories? By keeping them in one repository it is easier to deploy them onto one server. We can use just one cron file for all the scripts. However this feels wrong, as the 20 cronjobs are not logically related. Additionally, when using one requirements.txt file for all the scripts, it's hard to figure out what the dependencies are for a particular script and they all have to use the same versions of packages. We could separate all of the scripts out into their own repositories but this creates 20 different repositories that need to be remembered and dealt with. Most of these scripts are not very large and that solution seems to be overkill. A related question is, do we use one big crontab file for all cronjobs, or a separate file for each? If each has their own, how does one crontab's installation avoid overwriting the other 19? This also seems like a pain as there would then by 20 different cron files to keep track of. In short, our main question and issue is do we keep them all closely bundled as one repository or do we separate them out into their own repository with their own requirements.txt and fabfile.py? We feel like we're also probably looking over some really simple solution. Is there an easier way to deal with this issue?

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• Grading an algorithm: Readability vs. Compactness

  - by amiregelz

  Consider the following question in a test \ interview: Implement the strcpy() function in C: void strcpy(char *destination, char *source); The strcpy function copies the C string pointed by source into the array pointed by destination, including the terminating null character. Assume that the size of the array pointed by destination is long enough to contain the same C string as source, and does not overlap in memory with source. Say you were the tester, how would you grade the following answers to this question? 1) void strcpy(char *destination, char *source) { while (*source != '\0') { *destination = *source; source++; destionation++; } *destionation = *source; } 2) void strcpy(char *destination, char *source) { while (*(destination++) = *(source++)) ; } The first implementation is straightforward - it is readable and programmer-friendly. The second implementation is shorter (one line of code) but less programmer-friendly; it's not so easy to understand the way this code is working, and if you're not familiar with the priorities in this code then it's a problem. I'm wondering if the first answer would show more complexity and more advanced thinking, in the tester's eyes, even though both algorithms behave the same, and although code readability is considered to be more important than code compactness. It seems to me that since making an algorithm this compact is more difficult to implement, it will show a higher level of thinking as an answer in a test. However, it is also possible that a tester would consider the first answer not good because it's not readable. I would also like to mention that this is not specific to this example, but general for code readability vs. compactness when implementing an algorithm, specifically in tests \ interviews.

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• SQLRally Nordic gets underway

  - by Rob Farley

  PASS is becoming more international, which is great. The SQL Community has always been international – it’s not as if data is only generated in North America. And while it’s easy for organisations to have a North American focus, PASS is taking steps to become international. Regular readers will be aware that I’m one of three advisors to the PASS Board of Directors, with a focus on developing PASS as a more global organisation. With this in mind, it’s great that today is Day 1 of SQLRally Nordic, being hosted in in Sweden – not only a non-American country, but one that doesn’t have English as its major language. The event has been hosted by the amazing Johan Åhlén and Raoul Illyés, two guys who I met earlier this year, but the thing that amazes me is the incredible support that this event has from the SQL Community. It’s been sold out for a long time, and when you see the list of speakers, it’s not surprising. Some of the industry’s biggest names from Microsoft have turned up, including Mark Souza (who is also a PASS Director), Thomas Kejser and Tobias Thernström. Business Intelligence experts such as Jen Stirrup, Chris Webb, Peter Myers, Marco Russo and Alberto Ferrari are there, as are some of the most awarded SQL MVPs such as Itzik Ben-Gan, Aaron Bertrand and Kevin Kline. The sponsor list is also brilliant, with names such as HP, FusionIO, SQL Sentry, Quest and SolidQ complimented by Swedish companies like Cornerstone, Informator, B3IT and Addskills. As someone who is interested in PASS becoming global, I’m really excited to see this event happening, and I hope it’s a launch-pad into many other international events hosted by the SQL community. If you have the opportunity, thank Johan and Raoul for putting this event on, and the speakers and sponsors for helping support it. The noise from Twitter is that everything is going fantastically well, and everyone involved should be thoroughly congratulated! @rob_farley

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• Acceptable placement of the composition root using dependency injection and inversion of control containers

  - by Lumirris

  I've read in several sources including Mark Seemann's 'Ploeh' blog about how the appropriate placement of the composition root of an IoC container is as close as possible to the entry point of an application. In the .NET world, these applications seem to be commonly thought of as Web projects, WPF projects, console applications, things with a typical UI (read: not library projects). Is it really going against this sage advice to place the composition root at the entry point of a library project, when it represents the logical entry point of a group of library projects, and the client of a project group such as this is someone else's work, whose author can't or won't add the composition root to their project (a UI project or yet another library project, even)? I'm familiar with Ninject as an IoC container implementation, but I imagine many others work the same way in that they can scan for a module containing all the necessary binding configurations. This means I could put a binding module in its own library project to compile with my main library project's output, and if the client wanted to change the configuration (an unlikely scenario in my case), they could drop in a replacement dll to replace the library with the binding module. This seems to avoid the most common clients having to deal with dependency injection and composition roots at all, and would make for the cleanest API for the library project group. Yet this seems to fly in the face of conventional wisdom on the issue. Is it just that most of the advice out there makes the assumption that the developer has some coordination with the development of the UI project(s) as well, rather than my case, in which I'm just developing libraries for others to use?

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• Detecting Browser Types?

  - by Mike Schinkel

  My client has asked me to implement a browser detection system for the admin login with the following criteria, allow these: Internet Explorer 8 or newer Firefox 3.6 or newer Safari 5 or newer for Mac only And everything else should be blocked. They want me to implement a page telling the user what browser they need to upgrade/switch to in order to access the CMS. Basically I need to know the best way to detect these browsers with PHP, distinct from any other browsers, and I've read that browser sniffing per se is not a good idea. The CMS is WordPress but this is not a WordPress question (FYI I am a moderator on the WordPress Answers site.) Once I figure out the right technique to detect the browser I'm fully capable to make WordPress react as my client wants, I just need to know what the best ways are with PHP (or worse case jQuery, but I much prefer to do on the server) to figure how what works and what doesn't. Please understand that "Don't do it" is not an acceptable answer for this question. I know this client too well and when they ask me to implement something I need to do it (they are a really good client so I'm happy to do what they ask.) Thanks in advance for your expertise. -Mike

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• YouTube: Chrome Dev Tools Integration with NetBeans IDE!

  - by Geertjan

  Some time ago my colleague David Konecny discussed the question "What works better for you? NetBeans IDE or Chrome Developer Tools?". It's a good read. David highlights the point that it's not a question of either/or but both, since the two tools are like the apple/pear dichotmoy. However, good news! The two worlds are not divided in NetBeans IDE 7.4. Changes you make in Chrome Developer Tools (CDT) are automatically persisted to the related files in NetBeans IDE, as you can see in a new YouTube clip I made today. The new integration of CDT with NetBeans IDE has been mentioned in the NetBeans IDE 7.4 New & Noteworthy, while on Twitter this was sighted yesterday: Watch the movie above and within 5 minutes you too will see the simplicity and power of CDT integration with NetBeans IDE. In other news. I consider the above to be my favorite (though it's a tough choice, since there are so many new features in NetBeans IDE 7.4) new feature, for the article "What is your favorite new NetBeans IDE 7.4 feature?"

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• Delphi Client-Server Application using Firebird 2.5 error

  - by Japie Bosman

  I have got a lengthy question to ask. First of all Im still very new when it comes to Delphi programming and my experience has beem mostly developing small single user database applications using ADO and an Access database. I need to take the transition now to a client server application and this is where the problem starts. I decided to use Firebird 2.5 embeded as my database, as it is open source, and it is can be used with the interbase components in Delphi and that multiple clients can access the database simultanously. So I followed the interbase tutorial in Delphi. I managed to connect the client to the server and see the data in the example (While both are running on my pc), but when i tried to move the client to another pc, keeping the server on mine and running it to see if I can connect to the server it gave me the following error. Exception EIdSocketError in module clientDemo.exe at 0029DCAC. Socket Error # 10061 Connection refused. I understand that this might be because the host is defined as localhost in the client. But here is my first question. In the TSQLConncetion you can set die hostname under Driver-Hostname. The thing I want to know is how do you do this at run time, as I cannot get the property when I try and make an edit box to allow the user to enter the value and then set it via code like for example: SQLConncetion1.Driver.Hostname := edtHost.text; The thing is there is not such property to set, so how do you set the hostname at run time? Im using Delphi XE2 There is still a lot of questions to come especially when it comes to deployment, but I will take this piece by piece and I appreciate the advice.

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• Is the separation of program logic and presentation layer going too far?

  - by Timwi

  In a Drupal programming guide, I noticed this sentence: The theme hook receives the total number of votes and the number of votes for just that item, but the template wants to display a percentage. That kind of work shouldn't be done in a template; instead, the math is performed here. The math necessary to calculate a percentage from a total and a number is (number/total)*100. Is this application of two basic arithmetic operators within a presentation layer already too much? Is the maintenance of the entire system severely compromised by this amount of mathematics? The WPF (Windows Presentation Framework) and its UI mark-up language, XAML, seem to go to similar extremes. If you try to so much as add two numbers in the View (the presentation layer), you have committed a cardinal sin. Consequently, XAML has no operators for any arithmetic whatsoever. Is this ultra-strict separation really the holy grail of programming? What are the significant gains to be had from taking the separation to such extremes?

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• What triggered the popularity of lambda functions in modern mainstream programming languages?

  - by Giorgio

  In the last few years anonymous functions (AKA lambda functions) have become a very popular language construct and almost every major / mainstream programming language has introduced them or is planned to introduce them in an upcoming revision of the standard. Yet, anonymous functions are a very old and very well-known concept in Mathematics and Computer Science (invented by the mathematician Alonzo Church around 1936, and used by the Lisp programming language since 1958, see e.g. here). So why didn't today's mainstream programming languages (many of which originated 15 to 20 years ago) support lambda functions from the very beginning and only introduced them later? And what triggered the massive adoption of anonymous functions in the last few years? Is there some specific event, new requirement or programming technique that started this phenomenon? IMPORTANT NOTE The focus of this question is the introduction of anonymous functions in modern, main-stream (and therefore, maybe with a few exceptions, non functional) languages. Also, note that anonymous functions (blocks) are present in Smalltalk, which is not a functional language, and that normal named functions have been present even in procedural languages like C and Pascal for a long time. Please do not overgeneralize your answers by speaking about "the adoption of the functional paradigm and its benefits", because this is not the topic of the question.

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• Documenting your database with Visual Studio 2012 SSDT tools

  - by krislankford

  The title of this post is interesting and something I am wishing you and your colleagues had a better way to do. I understand as I am asked this question frequently. I couple of weeks ago I was asked the same question by a customer who documents their database using the ApexSQL Doc tools which uses the extended properties on objects to create automated documentation. I thought that was super interesting and went down the path to see how we could could support the creation of this documentation while leveraging the Visual Studio 2012 SSDT Tools. What I found is was rather intriguing. There is a property called “Description” on all objects in the SSDT tools. This property is rather subtle and I am betting overlooked. To be honest, this property has probably been there for a while and I just never discovered it. Adding text to this '”Description” property it allows Visual Studio to create the commands for the extended properties directly to your schema which should be version controlled. As I did more digging there seemed to be extended properties at every level in the SQL database objects. This fills some rather challenging gaps and allows organizations to manage SQL Schema using the Visual Studio SQL database tools while allowing a way to automatically document the database. This will also work in the automation of the creation and alter scripts that can be generated as part f an automated build system. Now we essentially get a way to store, build and document the database in a nice little ALM package. Happy Coding!

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• please help me understand libraries/includes

  - by fiftyeight

  I'm trying to understand how libraries work. for example I downloaded a tarball and extracted it. Now I do "./configure", it searches in pre-defined directories from what I understand for certain library files. What does it do then? it creates a makefile, and the makefile contains the paths to these libraries? than I do "make", it complies the source code and hard-codes the locations of the libraries? am I correct? I do not really understand if libraries are files with pre-defined paths or the OS somehow gives access to the libraries through system calls. another example, I complied something on my computer than moved it to a remote server, the executable needs mysql libraries to work, the server has mysql but for some reason when execute the file it tells me "can't find libmysqlclient.so.16". is there a solution for this? is there a way to know where is tries to locate this file or give it another path? I can't compile it on the server since it has no compiler and I don't have root access to install packages last question is if in the sequence "./configure","make","make install" the "make install" command is the only one that actually puts files outside the directory in which these files reside? if for example the software will be installed in /usr/local/ is the "make install" command the only one that will require "sudo" before it? let me see if I got it correctly: "./configure" creates the Makefile according to the location of various files on your system. "make" compiles the source code according to this makefile. and "make install" moves the files to their appropriate location. I know this has been very long I thank anyone who had the patience to read my question :)

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• OpenGL profiling with AMD PerfStudio 2

  - by Aurus

  I'm rendering just a really small amount of polygons for my UI but however I still tried to increase the FPS. In the end I removed redundant calls which increased the FPS. I really don't want to lose FPS for nothing so I keep looking for more improvements. The first thing I noticed is the "huge" time where no calls are made before SwapBuffer (the black one). Well I know that OpenGL works asynchronous so SwapBuffer has to wait until everything is done. But shouldn't PerfStudio mark this time also as black ? Correct me If I am wrong. The second thing I noticed is that some glUniform2f calls just take longer (the brown ones). I mean they should all upload 2floats to the GPU how can the time be so different from call to call. The program isn't even changed or something like that. I also tried to look at other programs like gDebugger or CodeXL but they often crashed and they show less statistics (only # of calls or redundant calls etc.) EDIT: I also realized that the draw calls also have different durations, which was obvious for me but sometimes drawing more vertices is faster than drawing less vertices.

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• How to read default key value with dconf or gsettings?

  - by Zta

  I would like to know the default value of a dconf/gsettings key. My question is a followup of the question below: Where can I get a list of SCHEMA / PATH / KEY to use with gsettings? What I'm trying to do, so create a script that reads all my personal preferences so I can back them up and restore them. I plan to iterate though all keys, like the script above, see what keys have been changed from their default value, and make a note of these, that can be restored later. I see that the dconf-editor display the keys' default value, but I'd very much like to script this. Also, I don't see how parsing the schemas /usr/share/glib-2.0/schemas/ can be automated. Maybe someone can help? gsettings get-default|list-defaults would be nice =) (Geesh, it was much easier in the old days where you just kept your ~/.somethingrc in subversion ... =\ Based on the answer given below, I've updated the script to print schema, key, key's data type, default value, and actual value: #!/bin/bash for schema in $(gsettings list-schemas | sort); do for key in $(gsettings list-keys $schema | sort); do type="$(gsettings range $schema $key | tr "\n" " ")" default="$(XDG_CONFIG_HOME=/tmp/ gsettings get $schema $key | tr "\n" " ")" value="$(gsettings get $schema $key | tr "\n" " ")" echo "$schema :: $key :: $type :: $default :: $value" done done This workaround basically covers what I need. I'll continue working on the backup scrip from here.

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• We're Subversion Geeks and we want to know the benefits of Mercurial

  - by Matt

  Having read I'm a Subversion geek, why should I consider or not consider Mercurial or Git or any other DVCS. I have a related follow up question. I read that question and read the recommended links and videos and I see the benefits but I don't see the overall mindshift people are talking about. Our team is of 8-10 developers that work on one large code base consisting of 60 projects. We use Subversion and have a main trunk. When a developer starts a new Fogbugz case they create a svn branch, do the work on the branch and when they're done they merge back to the trunk. Occasionally they may stay on the branch for an extended time and merge the trunk to the branch to pick up the changes. When I watched Linus talk about people creating a branch and never doing it again, that's not us at all. We create probably 50-100 branches a week without issue. The biggest challenge is the merging but we've gotten pretty good at that as well. I tend to merge by fogbugz case & checkin rather than the entire root of the branch. We never work remotely and we never make branches off of branches. If you're the only one working in that section of the code base then the merge to the trunk goes smoothly. If someone else had modified the same section of code then the merge can get messy and you might need to do some surgery. Conflicts are conflicts, I don't see how any system could get it right most of the time unless if was smart enough to understand the code. After creating a branch the following checkout of 60k+ files takes some time but that would be an issue with any source control system we'd use. Is there some benefit of any DVCS that we're not seeing that would be of great help to us?

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• Sprite Sheets in PyGame?

  - by Eamonn

  So, I've been doing some googling, and haven't found a good solution to my problem. My problem is that I'm using PyGame, and I want to use a Sprite Sheet for my player. This is all well and good, and it would be too, if I wasn't using a Sprite Sheet strip. Basically, if you don't understand, I have a strip of 32x32 'frames'. These frames are all in an image, along side each other. So, I have 3 frames in 1 image. I'd like to be able to use them as my sprite sheet, and not have to crop them up. I have used an awesome, popular and easy-to-use game framework for Lua called LÖVE. LÖVE has these things called "Quads". They are similar to texture regions in LibGDX, if you know what they are. Basically, quads allow you to get parts of an image. You define how large a quad is, and you define parts of an image that way, or 'regions' of an image. I would like to do something similar to this in PyGame, and use a "for" loop to go through the entire image width and height and mark each 32x32 area (or whatever the user defines as their desired frame width and height) and store that in a list or something for use later on. I'd define an animation speed and stuff, but that's for later on. I've been looking around on the web, and I can't find anything that will do this. I found 1 script on the PyGame website, but it crashed PyGame when I tried to run it. I tried for hours trying to fix it, but no luck. So, is there a way to do this? Is there a way to get regions of an image? Am I going about this the wrong way? Is there a simpler way to do this? Thanks! :-)

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• Is an app that does nothing but link to a web site functional enough to meet Apple's iOS guidelines?

  - by Pointy

  I don't hang out on Programmers enough to know whether this question is "ok", so my apologies if not. I tried to make the title obvious so at least it can be closed quickly :-) The question is simple. My employer wants "home screen presence" (or at least the possibility thereof) on iOS devices (also Android but I'm mostly interested in Apple at the moment). Our actual application will be a pure web-delivered mobile-friendly application, so what we want on the homescreen is basically something that just acts as a link to bring up Safari (or Chrome now I guess; not important). I'm presuming that that's more-or-less possible; if not then that would be interesting too. I know that the Apple guidelines are such that low-functionality apps are generally rejected out of hand. There are a lot of existing apps that seem (to me) less functional than a link to something useful, but I'm not Apple of course. Because this seems like a not-too-weird situation, I'm hoping that somebody knows it's either definitely OK (maybe because there are many such apps) or definitely not OK. Note that I know about things like PhoneGap and I don't want that, at least not at the moment.

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• Ray Tracing concers: Efficient Data Structure and Photon Mapping

  - by Grieverheart

  I'm trying to build a simple ray tracer for specific target scenes. An example of such scene can be seen below. I'm concerned as to what accelerating data structure would be most efficient in this case since all objects are touching but on the other hand, the scene is uniform. The objects in my ray tracer are stored as a collection of triangles, thus I also have access to individual triangles. Also, when trying to find the bounding box of the scene, how should infinite planes be handled? Should one instead use the viewing frustum to calculate the bounding box? A few other questions I have are about photon mapping. I've read the original paper by Jensen and many more material. In the compact data structure for the photon they introduce, they store photon power as 4 chars, which from my understanding is 3 chars for color and 1 for flux. But I don't understand how 1 char is enough to store a flux of the order of 1/n, where n is the number of photons (I'm also a bit confused about flux vs power). The other question about photon mapping is, if it would be more efficient in my case to store photons per object (or even per Object's triangle) instead of using a balanced kd-tree. Also, same question about bounding box of the scene but for photon mapping. How should one find a bounding box from the pov of the light when infinite planes are involved?

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