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• PHP city-sim castle layout

  - by Gert

  I am currently contemplating the layout system for my php based game but i've run into a couple of worries. So my idea is a 9X9 grid where the center 3X3 are inner castle. The inner castle will be 6X6 if you enter it(click on it). and with the option to expand the inner castle converting one of the 9X9 tiles to a 4X4 inner castle tile. So here is my question: What is the best way to tackle this type of layout? my original idea was a 18X18 grid and saving it in the db as (idCastle, Y, X) where X is a string of 18 numbers long telling me if the tile is an inner/outer tile or a inner/outer building. but i am not really fond of this idea and would like to hear some other ideas on how to tackle this. Thanks in Advance, Gert

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• how to make Chromium-browser start on vnc display?

  - by Oleksandr Dudchenko

  I have started Tightvncserver on Lubuntu 12.04 via the command $ tightvncserver -geometry 800x600 -depth 16 :2 VNC server successfully started and I got message like follows. New 'X' desktop is gateway:2 Starting applications specified in /home/dolv/.vnc/xstartup Log file is /home/dolv/.vnc/gateway:2.log Then I've successfully loged in from remote PC using realvncclient. Trying to start Chromium-browser from menu... no luck. There was one more attempt: I opened the LXTerminal from menu. Trying to start is from terminal with the command /usr/bim/chromium-browser & it returned the message like follows: Xlib: extention "RANDR" missing on desktop :2 I have also discovered that after my two attampts the chromium-browser has created 2 new windows on the host on which was session running on display :0 The Question: How to make the browser start on that display from which it was called (in my occasion from vnc session display)?

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• Developing an online email service [closed]

  - by Richard Stokes

  I am interested in developing an online email service (e.g. Gmail, Hotmail, but on a much smaller scale) allowing people to sign up for free email addresses on my domain. The domain in question is already purchased, but I have no idea how to even start. I was hoping to code this using a Ruby framework such as Rails or Sinatra. Firstly, are there any libraries/pre-made solutions to this problem that exist already that would be easy enough to just plug-in to my own site? Secondly, if there are no real pre-made solutions, what are the general steps I need to take to accomplish this task?

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• How to get scripted programs governing game entities run in parallel with a game loop?

  - by Jim

  I recently discovered Crobot which is (briefly) a game where each player codes a virtual robot in a pseudo-C language. Each robot is then put in an arena where it fights against other robots. A robots' source code has this shape : /* Beginning file robot.r */ main() { while (1) { /* Do whatever you want */ ... move(); ... fire(); } } /* End file robot.r */ You can see that : The code is totally independent from any library/include Some predefined functions are available (move, fire, etc…) The program has its own game loop, and consequently is not called every frame My question is: How to achieve a similar result using scripted languages in collaboration with a C/C++ main program ? I found a possible approach using Python, multi-threading and shared memory, although I am not sure yet that it is possible this way. TCP/IP seems a bit too complicated for this kind of application.

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• Google's process for publishing/modifying pages [closed]

  - by Glenn Dayton

  I'm assuming that a group of people at Google have control of certain sections of google.com, but how does Google make sure that employees don't accidentally or intentionally sabotage the website? Does Google use Adobe Contribute or some similar product for sharing/publishing the website. Do employees use WebDAV, FTP, SFTP, or SSH to publish the site. Since Google has hundreds of thousands of servers it probably takes some time for its servers to update. Do they transmit the new copy of the website to all servers before publishing at once? This question does not apply to Google editing a database and having a page reflect the database's changes. It applies to employees editing the source code and/ or back end of the site.

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• Is it possible to remove a particular host key from known_hosts?

  - by Kaustubh P

  I usually end up deleting the entire known_hosts file, which I have no problems for. But just out of curiosity, Is it possible to remove just a single entry? I opened the known_hosts file, and other han understanding that the file contains fingerprints for a given machine, I ddnt understand anything. Below is the message I faced, which led me to ask this question. Add correct host key in /home/wissen16/.ssh/known_hosts to get rid of this message. Offending key in /home/wissen16/.ssh/known_hosts:1 RSA host key for foo.com has changed and you have requested strict checking. Host key verification failed. Thanks.

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• Independent projects as a student to show off abilities

  - by tufcat

  I'm an inexperienced student (having learned up to data structures and algorithms through various online resources) of computer science, and I'm hoping to get a job as a developer some time after I've gotten a few independent projects done. My question is, how should I choose which projects to work on? I've been looking around stackoverflow-- people usually say to pick whatever you're interested in, but I don't have enough experience to even know what specifically I'm interested in, and possibly more importantly, I don't know what some common beginner project types are. Essentially, I'm at the gap between course work (and the projects entailed in those classes) and real programming, and I don't quite know how to start. If any of you have any ideas, I'd really appreciate it.

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• College for Game Development [closed]

  - by Cole Adams

  I am currently a Freshman Computer Science Major at Samford University, but I am realizing that the actual field I want to get into is Game Development. I go to all of these classes that are supposed to make you well rounded that have nothing to do with what I want to do and frankly, after 18 years of schooling, I am sick of having to be in classes like that. I want to go to a Game Design/Development school where that is the priority and I am not overburdened with useless classes. At this point I am so tired of the Samford classes already that I am heavily considering taking next semester off and just getting a job and focusing on learning programming on my own or something like that. My question is what would be some good schools to apply to for enrollment in 2013 and what does it take to get into these schools? Thanks in advanced.

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• Do delegates defy OOP

  - by Dave Rook

  I'm trying to understand OOP so I can write better OOP code and one thing which keeps coming up is this concept of a delegate (using .NET). I could have an object, which is totally self contained (encapsulated); it knows nothing of the outside world... but then I attach a delegate to it. In my head, this is still quite well separated as the delegate only knows what to reference, but this by itself means it has to know about something else outside it's world! That a method exists within another class! Have I got myself it total muddle here, or is this a grey area, or is this actually down to interpretation (and if so, sorry as that will be off topic I'm sure). My question is, do delegates defy/muddy the OOP pattern?

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• What the different hardware temperatures listed in psensor, sensor viewer etc reffer to?

  - by cipricus

  I have installed psensor and see a list of temperatures, but listed as ”Temperature 1”, 2, 3 etc . I can only guess where the processor is: but who's who for sure? The same question stands for Sensors Viewer. I can also type sensors in Terminal but I get no more than that acpi -t gives Thermal 0: ok, 65.0 degrees C Thermal 1: ok, 37.9 degrees C Thermal 2: ok, 56.0 degrees C Thermal 3: active, 71.0 degrees C Considering psensor, I know for a fact that: - the temperature that varies most depending on the CPU use is Temp1 and it is one of the two highest - the other high temperature is Temp4 and it goes to the ceiling when using youtube/flash - Temp2 is very stable at a medium level of 50-60 degrees Celsius - Temp3 is by far the lowest and most imobile So, I guess Temp1 is the CPU temperature, and Temp4 is the GPU temperature. Temp2 and 3 must be the motherboard and the hdd. Does anybody know for sure?

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• How can I reply to email by sending a delivery failure message?

  - by wau

  Occasionally, I receive unwanted emails, particularly low-volume spam, or email messages falsely addressed to me (possibly due to typos). I don't want to spend the energy to write a personal message, but I do want to let the sender know that the message never arrived at its destination, and that resending it will be useless. In my opinion, a delivery error message to the sender will fill that need. So, the question is if there is an easy way to send error messages back to the sender. Is there any email client out there which supports sending delivery failure messages as a reply to incoming email -- ideally in one click? (Or, which can be configured to do so?) Alternatively, what is the best way to set up an environment that allows me to send delivery failure messages without too much effort per message sent?

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• multi-clients web application,should I use custom user controls or a common user control

  - by ValidfroM

  Say my company is going to build a complicated asp.net web form education system. One of the module is web based registration. To make it flexiable, we decide to use user control(ascx) with rule-engine (work flow) regulating all business logic behide them. Thus in future,for different clients, we can simply config basic existing rules or adding new rules.(Rules stored in db or XML per client). Now the question is how to deal with the user controls (ascx)? My opinion is for different client build diffrent user control from scratch. other voice is like reuse existing user controls.

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• ATI graphics card, with gnome shell on Ubuntu 11.10, screen flickers

  - by bioShark

  After installing gnome shell, without any problem, after log in the fonts are missing and it looks like crap...nothing is readable. Don't want to make it a double post, because my issue is similar to the one from this question but for me the problems have not been solved properly. After running the commands from that post, and installing the latest AMD 11.10 driver, the Gnome shell display issues have been solved. But each time I move the mouse in the upper left corner, to bring up the applications...my entire screen flickers. Without the applications been displayed, everything looks fine. Hardware: ATI HD4870, Intel Q6600.

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• phpBB3 antispam: mod for "patrolling" the forum?

  - by STATUS_ACCESS_DENIED

  I've been working on various antispam measure in a phpBB3-based forum I host. Now I was thinking of an extension/mod that ties in with editing of posts (and later perhaps signatures/profiles) in that new text or edited text defaults to something like "not patrolled" and moderators could then in a special queue review text that contains links or similar item (based on heuristics). Now the question: does such a mod exist (I didn't find one)? If it does exist and anyone has used it (or them), please include your experiences with it in the answer.

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• How can you predict the time it will take for two processes in two different machines in a cluster to communicate?

  - by Dokkat

  I am trying to develop a computing application which needs a lot of memory (500gb). Buying a single machine for that is overly expensive. I can, though, buy ~100 small instances on Digital Ocean or similar, divide the memory in blocks and use TCP to emulate shared memory between the instances. Now, my question is: how can I measure/predict the time it will take for two processes in two different machines like that to share information, in comparison to IPC and shared memory? Are there rules of thumb? I don't want exact values, but knowing more or less how much faster one is would be very helpful in visualising the feasibility of this approach.

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• Functions returning pointers

  - by fg nu

  C++ noob here. I have a very basic question about a construct I found in the C++ book I am reading. // class declaration class CStr { char sData[256]; public: char* get(void); }; // implementation of the function char* CStr::get(void) { return sData; } So the Cstr::get function is obviously meant to return a character pointer, but the function is passing what looks like the value (return sData). Does C++ know to return the address of the returned object? My guess would have been that the function definition would be return &sData.

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• After executing a command in the terminal, I sometimes can't execute another

  - by jreed121

  First off sorry for the noob question, I'm sure it's been asked before but I have no idea how to phrase it eloquently... Sometimes when I open/run/execute (unsure of proper term) an application (?lol) from the terminal like geany ie: geany filename.php or maybe run a node.js script: node server.js The command will execute fine, but I'm then left without the ability to execute any other commands unless I open another terminal. my root@pcname:~$ is gone and when I try typing in something else and hitting Enter it just breaks to the next line. I've noticed that sometimes I can hit CTRL+D and it'll give me my prompt back (sorry is prompt even the right name for it?) So could someone please explain why this is happening and how I can get back to the prompt without opening another terminal. Thanks, and sorry again for my noobery.

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• Trim on encrypted SSD--Urandom first?

  - by cb474

  My understanding (I'm not sure I'm getting this all right) is that if one uses Trim on an encrypted SSD, it defeats some of the security benefits, because the drive will write zeros to empty space (as files are deleted). See: http://www.askubuntu.com/questions/115823/trim-on-an-encrypted-ssd And: http://asalor.blogspot.com/2011/08/trim-dm-crypt-problems.html My question is: From the perspective of the performance of the SSD and the functioning of Trim, would it therefore be better to simply zero out the SSD, before setting up an encrypted system, rather than writing random data to the drive, with urandom, as one usually does? Would this basically leave one with the same level of security anyway? And more importantly, would it better enable the Trim functionality to work as intended, with the encrypted SSD?

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• Learn a NoSQL or become a badass with traditional RDMS - Where is/will the work be?

  - by beck

  I'm half way through my MSc and am thinking about my dissertation which I get 3 months to work on full time. Im very comfortable with the traditional Relational Database, the question is should I work on a project where I get a good understanding of something like Cassandra, or should I really push my RDMS knowledge to the limit. Getting great at something like MySQL is a solid safe option, will there really be much work for me with Cassandra in my tool belt? I would love to do either.... Thanks for your opinions and advice.

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• How can I inform search engines that the usefulness of some content on my site has a limited shelf life?

  - by Tim Post

  Let's say that I run a forum dedicated to computer hardware. Naturally, people are going to ask questions like: What is the best laptop for running [os] Or What is the best video card for under [amount] These may be perfectly fine discussions, but the content loses usefulness over time. An answer to either question asked in 2007 might still be relevant in 2008, but definitely not in 2012. Is there a way that I can tell search engines that certain pages might not give visitors what they're looking for after a certain date, and perhaps hint to a page on my site that would provide good information? Perhaps something I could set in HTTP response headers, meta tags or even a site map?

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• Web technologies on GUI apps

  - by Apalala

  I developed many GUI applications for the Windows platform during my early professional career, and saw several GUI frameworks come, have whole magazines devoted to them, and then fade away. MFC is iconic. Tasked with writing yet another GUI application, I starter researching cross-platform frameworks like Qt and WxWindows. I found the same steep learning curves I knew from before, and tooling doesn't help much in building a functional and elegant user interface because its clumsy and complicated. But people are building beautiful and functional UIs on the Web all the time (look at this site!). The standards, the libraries, and the tools are certainly there. My thought and my question: Why not write a GUI in which most of the UI is handled by an embedded browser? I already know that the Qt widgets support a large part of CSS and JavaScript, and programmers with good knowledge about web development are relatively easy to find, ..., so... Have you done something like that before? What's your experience/advise?

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• graphical interface when using assembly language

  - by Hellbent

  Im looking to use assembly language to make a great game, not just an average game but a really great game. I want to learn a framework to use in assembly. I know thats not possible without learning the framework in c first. So im thinking of learning sdl in c and then learn, teach myself, how to interpret the program and run it as assembly language code which shouldnt be that hard. Then i will have a window and some graphics routines to display the game while using assembly to code everything in. I need to spend some time learning sdl and then some more time learning how to code all those statements using assembly while calling c functions and knowing what registers returned calls use and what they leave etc. My question is , Is this a good way to go or is there something better to get a graphical window display using assembly language? Regards HellBent

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• Behavior tree implementation details

  - by angryInsomniac

  I have been looking around for implementation details of behavior trees, the best descriptions I found were by Alex Champarand and some of Damian Isla's talk about AI in Halo 2 (the video of which is locked up in the GDC vault sadly). However, both descriptions fall short of helping one actually create a BT, one particular question has been bugging me for a while. When is the tree in a behavior tree evaluated? Furthermore: If the tree is in the middle of executing a sequence of actions (patrolling waypoints) and a higher priority impulse comes in (distraction sound) , how to switch to that side of the tree seamlessly without resorting to a state machine like system and if it is decided that the impulse was irrelevant (the distraction is too far away to affect this guard), how to go back to the last thing that the guard was doing ? I have quite a few questions like this and I don't wish to flood the board with separate queries so if you know of any resource where questions like these can be answered I would be very grateful.

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• Need to know best way to utilize LVM to backup Ubuntu

  - by William Leininger

  So I've had issues with Windows which forced me to install and learn Ubuntu as I'm fed up with MSFT. So now I need to know the most efficient/best way to image Ubuntu so that if I messed something up in one point in time I could always come back to the healthy point in time. During the install I saw an option for LVM and read what it is though I don't know how to utilize it to prevent a situation where I have to reinstall everything. Help? Note: I found on the right hand side of this Ask A Question area an area titled Similar Questions giving me Setting up LVM Snapshot as a backup/restore point in ubuntu This is pretty in depth and a bit complex, though completely doable, is it possible to just use LVM out of the box after a complete HDD wipe and normal Ubuntu install? :Fingers crossed and rabbits foot in hand:

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• Is there an open source alternative to "Adobe Digital Editions"?

  - by soulsource

  For the moment I run Adobe Digital Editions under Wine to download ebooks burdened with ditigal restriction management. I only use it to open .acsm files supplied by ebook-shops, which contain authentication information required to download the actual DRM'ed ebook files, which I then transfer to my reader-device with calibre. My question is, if there exist open source alternatives to Adobe Digital Editions. They don't need much functionality. I just want to put the .acsm-file in and get the .epub out (no, I don't want to remove the drm, that'd be illegal afaik).

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