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• Trying to turn an old computer into a server. Where do I start?

  - by Stanton.Sculpture

  My old computer is a mac powerbook g4 that I am considering turning into an Ubuntu Server for my house of eight to share movies and music and whatever. I've never even thought about doing this kind of stuff before so I don't even know where to start. Can someone point me in the right direction? My Concerns: Most of my house mates have macs. Will there be compatibility issues? Can I make it a wireless network? My old powerbook g4 might not have the balls. Money Thanks!

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• A* how make natural look path?

  - by user11177

  I've been reading this: http://theory.stanford.edu/~amitp/GameProgramming/Heuristics.html But there are some things I don't understand, for example the article says to use something like this for pathfinding with diagonal movement: function heuristic(node) = dx = abs(node.x - goal.x) dy = abs(node.y - goal.y) return D * max(dx, dy) I don't know how do set D to get a natural looking path like in the article, I set D to the lowest cost between adjacent squares like it said, and I don't know what they meant by the stuff about the heuristic should be 4*D, that does not seem to change any thing. This is my heuristic function and move function: def heuristic(self, node, goal): D = 10 dx = abs(node.x - goal.x) dy = abs(node.y - goal.y) return D * max(dx, dy) def move_cost(self, current, node): cross = abs(current.x - node.x) == 1 and abs(current.y - node.y) == 1 return 19 if cross else 10 Result: The smooth sailing path we want to happen: The rest of my code: http://pastebin.com/TL2cEkeX

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• How to install again Update Manager after uninstalling it

  - by biezdar

  Ok, the thing is this I tried asking many times on few ubuntu forums how to deal with my non-responsive Update Manager, but all I was getting was the same stuff (run it from the terminal, run some lines, apt-get update blah blah). Nothing was helping. Eventually I went mad Windows style and tried to simply uninstall it and install it again. The problem is - how to install it again? Can't do it through Software Center, can't really build a package (because I'm too stupid to do that). And I seriously want to avoid reinstalling the whole system. I am running a 12.04 verison (Update Manager was unable to update to a newer one) Please help. I am furious with this thing.

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• after login, the desktop remains blank.

  - by MobileDev123

  Hi, I have installed Ubuntu 10 last night and finished all upgrading stuff, in the time when updates are applied I downloaded a torrent file. As soon as download is finished I rebooted my system. As usual at start up it asked my login and I did the same. After a successful login It should show me the desktop, or show an error message in case anything has gone wrong. But what I had is only a cursor and a blank wall paper. Can anybody tell me what is the problem and how to resolve this? Thanks

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• Does FP mess up your OOP skills?

  - by bonomo

  I've been learning functional programming in Haskell and F# for awhile and now when I got some skills it gets harder for me to think in OOP way and program in C# and JavaScript. Everything seems to be ass-backwards there with classes, interfaces, objects and I often stare at the screen trying to think of a better way around without using them. This is something that scares me, because I didn't have problems like that before (not knowing that the same stuff can be done in a different way). So I am concerned as I don't want to loose myself as a OOP developer, because this is what I do for living. Is it a normal thing? Shall I rather stop doing FP? How did you manage to cope with it?

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• Is it bad style to redundantly check a condition?

  - by mcwise

  I often get to positions in my code where I find myself checking a specific condition over and over again. I want to give you a small example: suppose there is a text file which contains lines starting with "a", lines starting with "b" and other lines and I actually only want to work with the first two sort of lines. My code would look something like this (using python, but read it as pseudocode): # ... clear_lines() # removes every other line than those starting with "a" or "b" for line in lines: if (line.startsWith("a")): # do stuff if (line.startsWith("b")): # magic else: # this else is redundant, I already made sure there is no else-case # by using clear_lines() # ... You can imagine I won't only check this condition here, but maybe also in other functions and so on. Do you think of it as noise or does it add some value to my code?

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• Which is the best non-java, dynamic, programming language to build attractive GUIs?

  - by VeeKay

  I am well acquainted with java and groovy but somehow I am not intrigued by the performance or looks of swing based applications that are developed on the same. So I want to learn and know about THE best alternate dynamic programming language (coz I am looking for little bit of luxury while writing code by not willing to fiddle with pointers, memory handling, static typing difficulties etc) to develop attractive cross platform GUIs. To be precise, when I say attractive I mean support for elegant translucent windows and nicer components (not the flashy adobe stuff). Can you please suggest me a programming language that manages to fit into this?

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• Windows 8 Install

  - by Richard Jones

  So did my first Windows 8 install today. Did it on a Macbook Pro (bootcamp partition). Bootcamp partition, needed to be formatted by Windows 8, in-order to proceed. However once done install went smoothly. Installed the Apple Windows Support stuff in compatibility mode; which went well. I tried it first not in compatibility mode and it caused a Blue Screen of death (which now has a :-( icon ) The volume, brightness etc. soft keys work well. I had some trouble joining wireless networks; so hopefully a windows update will resolve. First impression, is that 'its just like Windows 7', but with Metro. We'll see what happens over the next few days.

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• How to name a method that both performs a task and returns a boolean as a status?

  - by Limbo Exile

  If there is a method bool DoStuff() { try { // doing stuff... return true; } catch (Exception ex) { return false; } } should it rather be called IsStuffDone()? Both names could be misinterpreted by the user: If the name is DoStuff() why does it return a boolean? If the name is IsStuffDone() it is not clear whether the method performs a task or only checks its result. Is there a convention for this case? Or an alternative approach, as this one is considered flawed? For example in languages that have output parameters, like C#, a boolean status variable could be passed to the method as one and the method's return type would be void.

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• File system layout for multiple build targets

  - by Yttrill

  I am seeking some ideas for how to build and install software with some parameters. These including target OS, target platform CPU details, debugging variant, etc. Some parts of the install are shared, such as documentation and many platform independent files, others are not, such as 64 and 32 bit libraries when these are separated and not together in a multi-arch library. On big networked platforms one often has multiple computers sharing some large server space, so there is actually cause to have even Windows and Unix binaries on the same disk. My product has already fixed an install philosophy of $INSTALL_ROOT/genericname/version/ so that multiple versions can coexist. The question is: how to manage the layout of all the other stuff?

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• Dev Connections Azure Tutorial

  I am more than a little tardy with this blog post but the link for the tutorial code can be found here: http://www.dasblonde.net/downloads/windowsazureessentialslaunch042010.zip If you had already downloaded the code from the link specified in my tutorial slides, that link (and this one) are both updated with some new stuff. If you attended my similar tutorial in Norway, there are updates to the scripts here that you might be interested in. I created some PowerShell scripts to delete all Windows Azure...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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• Entry level developer career advice [closed]

  - by Evan

  I just got done with college and I have a full time job with a large software company that I have been an intern at for over a year. As an intern I was on the web team doing lots of architecture and developing UI in ExtJS and some Java backend experience. Now as a full time employee I am mainly doing ExtJS applications, which I enjoy a lot, and I want to stay in the web development field, but: Am I limiting my career options with just doing ExtJS stuff? Will experience in ExtJS help or hinder my programming skills? Will I be looked down upon because I'm only gaining experienced with ExtJS?

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• How to make natural-looking paths with A* on a grid?

  - by user11177

  I've been reading this: http://theory.stanford.edu/~amitp/GameProgramming/Heuristics.html But there are some things I don't understand, for example the article says to use something like this for pathfinding with diagonal movement: function heuristic(node) = dx = abs(node.x - goal.x) dy = abs(node.y - goal.y) return D * max(dx, dy) I don't know how do set D to get a natural looking path like in the article, I set D to the lowest cost between adjacent squares like it said, and I don't know what they meant by the stuff about the heuristic should be 4*D, that does not seem to change any thing. This is my heuristic function and move function: def heuristic(self, node, goal): D = 10 dx = abs(node.x - goal.x) dy = abs(node.y - goal.y) return D * max(dx, dy) def move_cost(self, current, node): cross = abs(current.x - node.x) == 1 and abs(current.y - node.y) == 1 return 19 if cross else 10 Result: The smooth sailing path we want to happen: The rest of my code: http://pastebin.com/TL2cEkeX

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• Lua and multi-paradigm programming: scope and capabilities

  - by Ef Es

  Despite having started learning programming with Pascal and C, after the jump to OO (C++, Java) I lost sense of the structured programming paradigm. I have started learning Lua and I have researched many tutorials, but all of them only cover basic operations and language features and capabilities. They feel more like a reference doc than a programmer's guide. Now, when trying to work with day to day tasks, how does one go through most common design patterns like observer, or multithreaded programming, creating UI elements and polling system calls for keyboard or sensors? Is it even feasible in this languages or you have to work with the C binding, libraries and low-level programming to get most stuff done? Do I get the Lua scope wrong?

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• 2D Ragdoll - should it collide with itself?

  - by Axarydax

  Hi, I'm working on a ragdoll fighting game as a hobby project, but I have one dilemma. I am not sure if my ragdoll should collide with itself or not, i.e. if ragdoll's body parts should collide. 2D world is somewhat different than 3D, because there are several layers of stuff implied (for example in Super Mario you jump through a platform above you while going up). The setup I'm currently most satisfied with is when only the parts which are joined by a joint don't collide, so head doesn't collide with neck, neck with chest, chest with upper arm etc, but the head can collide with chest, arms, legs. I've tried every different way, but I'm not content with either. Which way would recommend me to go?

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• What''s easy extensible technique to store game data?

  - by Miro

  I'm looking for library/technique for storing my game resources - levels, object (effects,world info), items(price,effects,...), NPC(visual info, behavior), everything except graphics/audio stuff. I've seen lua used for Awesome WM configuration. protobuf looks good, but it seems to be designed for network communication. I've tried to write my own parser, but as the project grows it's more and more harder to manage it and catch all the bugs. My requiremets: stability easy extension of data without need to convert older versions to newer good(don't have to be the best) performance of loading not much coding not XML!

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• how to apt-get install with only minimal components necessary for an application

  - by ib84

  apt-get is really great. However, when you want to install an application, you often are forced to install a lot of dependencies which I believe are very often optional. For example, I want to install okular and I'm ask to install 97 packages / 233MB ! That is a lot. I particularly dislike that it wants me to install nepomuk and a lot of other stuff that has nothing to do with PDF viewing per se, and which implies demons, and many of which are clearly optional but not necessary. Question: How to do minimal install with apt-get for a given package, with only the necessary componentents to get the thing run? It's ok if some features disabled at first.

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• What's a good open source cloud computing software? [closed]

  - by boy

  In particular, the "cloud" computing that I'm referring to is: I'm going to get some Linux servers. Then I have pretty big computing tasks to do every day. So my goal is to be able to run some shell command to request an "instance" (ie, if a server has 4 CPU, then the computing software will configure that server to have 4 instances, assuming all my tasks are single thread). Ideally, then I can run the following command: ./addjobs somebatchfile where somebatch file contains one command per line ./removejobs all ./listalljobs (ie, everything is done in shell. And the "computing software" can return me the hostname that's available in some environment variable, etc) And that's all I needed. I run into OpenStack.. but it seems too complicated for this purpose (ie, it does all the Imagine sharing stuff, etc).. All I want, is something SIMPLE that manages the Linux boxes for me and I'm just going to run shell commands on them... Is there such open source software? Thanks,

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• Why does the Git community seem to ignore side-by-side diffs

  - by Kyle Heironimus

  I used to use Windows, SVN, Tortoise SVN, and Beyond Compare. It was a great combination for doing code reviews. Now I use OSX and Git. I've managed to kludge together a bash script along with Gitx and DiffMerge to come up with a barely acceptable solution. I've muddled along with this setup, and similar ones, for over a year. I've also tried using the Github diff viewer and the Gitx diff viewer, so it's not like I've not given them a chance. There are so many smart people doing great stuff with Git. Why not the side-by-side diff with the option of seeing the entire file? With people who have used both, I've never heard of anyone that likes the single +/- view better, at least for more than a quick check.

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• Beginner help with compiling a driver into the kernel so my ethernet works

  - by MattC

  I have a Acer Aspire Revo nettop and it seems like it's a common error that Ubuntu doesn't have a driver for the ethernet. Someone recommend following the steps on this page. http://manpages.ubuntu.com/manpages/jaunty/man4/nfe.4freebsd.html The only problem is that I have no clue what to do really. I'm almost like an absolute beginner with linux and was hoping to play with it by doing some apache+php+mysql stuff, however I cannot at the moment. Where is the kernel configuration file? and where is the loader.conf file?

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• Testing HTML5 and javascript code for iPhone and Android devices

  - by Pankaj Upadhyay

  I have developed a simple HTML5 webpage that uses a javascript file. This is a fun learning page so I wanted to know as to how will they show up on mobile devices like iPhone and Android smartphones. The pages are hosted on a server and i have tested the thing on my desktop. But, how can i test the same for these mobile devices. i.e. how the page will look on mobile and stuff. I don't have an iPhone or Android. There is no serious development going in here so i was thinking if there is some free website or tool that acts as a iPhone or android browser. The main aim is just to see how the webpage will show up on an android phone.

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• Failed to load session "ubuntu"

  - by harsh

  I installed CCSM to enable window previews in Unity. But when I went into extras, there was no 'window preview' option. So I tried experimenting with other options in Compiz and now there are no borders in the dialogue boxes (close, minimize, restore buttons are not there, I had enabled some 'flat....' option in Compiz. Later, I uninstalled Compiz and then reinstalled it. Now it says "Failed to load session Ubuntu" I can't even access through the guest account, I am new to Ubuntu.(please explain in detail). All I have access to is the login screen (it still shows my custom wallpaper). Please help, I don't want to lose my stuff.

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• Creating a DrawableGameComponent

  - by Christian Frantz

  If I'm going to draw cubes effectively, I need to get rid of the numerous amounts of draw calls I have and what has been suggested is that I create a "mesh" of my cubes. I already have them being stored in a single vertex buffer, but the issue lies in my draw method where I am still looping through every cube in order to draw them. I thought this was necessary as each cube will have a set position, but it lowers the frame rate incredibly. What's the easiest way to go about this? I have a class CubeChunk that inherits Microsoft.Stuff.DrawableGameComponent, but I don't know what comes next. I suppose I could just use the chunk of cubes created in my cube class, but that would just keep me going in circles and drawing each cube individually. The goal here is to create a draw method that draws my chunk as a whole, and to not draw individual cubes as I've been doing.

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• Is it a bad practice to include all the enums in one file and use it in multiple classes?

  - by Bugster

  I'm an aspiring game developer, I work on occasional indie games, and for a while I've been doing something which seemed like a bad practice at first, but I really want to get an answer from some experienced programmers here. Let's say I have a file called enumList.h where I declare all the enums I want to use in my game: // enumList.h enum materials_t { WOOD, STONE, ETC }; enum entity_t { PLAYER, MONSTER }; enum map_t { 2D, 3D }; // and so on. // Tile.h #include "enumList.h" #include <vector> class tile { // stuff }; The main idea is that I declare all enums in the game in 1 file, and then import that file when I need to use a certain enum from it, rather than declaring it in the file where I need to use it. I do this because it makes things clean, I can access every enum in 1 place rather than having pages openned solely for accessing one enum. Is this a bad practice and can it affect performance in any way?

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• Book Giveaway: 7 Free Copies of Network Your Computers for Our Readers

  - by The Geek

  Our friends over at 7 Tutorials have organized a giveaway exclusively for How-To Geek readers, and you can enter to get your own copy of their book Step by Step: Network Your Computers and Devices, published by Microsoft Press. All you have to do is subscribe to their newsletter and fill out a short form. They’ve got daily or weekly newsletters full of excellent tutorials covering Windows 7 and other topics, so it’s all good stuff. Celebrating 3 Years of 7 Tutorials with How-To Geek Readers How to Use an Xbox 360 Controller On Your Windows PC Download the Official How-To Geek Trivia App for Windows 8 How to Banish Duplicate Photos with VisiPic

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