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• XNA C# Platformer - physics engine or tile based?

  - by Hugh

  I would like to get some opinions on whether i should develop my game using a physics engine (farseer physics seems to be the best option) or follow the traditional tile-based method. Quick background: - its a college project, my first game, but have 4 years academic programming experience - Just want a basic platformer with a few levels, nothing fancy - want a shooting mechanic, run and gun, just like contra or metal slug for example - possibly some simple puzzles I have made a basic prototype with farseer, the level is hardcoded with collisions and not really tiled, more like big full-screen sized tiles, with collision bodies drawn manually along the ground and walls etc. My main problem is i want a simple retro feel to the jumping and physics but because its a physics simulation engine its going to be realistic, whereas typical in air controllable physics for platformers arent realistic. I have to make a box with wheel body fixture under it to have this effect and its glitchy and doesnt feel right. I chose to use a physics engine because i tried the tile method initially and found it very hard to understand, the engine took care of alot things to save me time, mainly being able to do slopes easily was nice and the freedom to draw collision bounds wherever i liked, rather then restricted to a grid, which gave me more freedom for art design also. In conclusion i don't know which method to pick, i want to use a method which will be the most straight forward way to implement and wont give me a headache later on, preferably a method which has an abundance of tutorials and resources so i dont get "stuck" doing something which has been done a million times before! Let me know i haven't provided enough information for you to help me! Thanks in advance, Hugh.

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• ASP.NET variable scope

  - by c11ada

  hey all, im really new to ASP.Net and still havnt got my head round most of the concepts, im really having problems with variable, when creating a desktop application, any variable created in code for example int n = 10; this variable will be there until the program is running right. but in asp iv created variables which are supposed to last until the user gets of that page, so for example say i have a page which takes the users value ( call this variable n say the user type in 10) and every time the user presses the next button the code add 10 to this value. so the first time the user presses the next button n= n + 10; what i have found is no matter how many times i press the next button n will always equal 20, because the previous value is not saved !! these values are populated the first time the user enters that page, once the user clicks the next button the content of these values disappear! how can stop this from happening ?? hope this makes sense !! thanks

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• Overriding as_json has no effect?

  - by Ola Tuvesson

  I'm trying to override as_json in one of my models, partly to include data from another model, partly to strip out some unnecessary fields. From what I've read this is the preferred approach in Rails 3. To keep it simple, let's say I've got something like: class Country < ActiveRecord::Base def as_json(options={}) super( :only => [:id,:name] ) end end and in my controller simply def show respond_to do |format| format.json { render :json => @country } end end Yet whatever i try, the output always contains the full data, the fields are not filtered by the ":only" clause. Basically, my override doesn't seem to kick in, though if I change it to, say... class Country < ActiveRecord::Base def as_json(options={}) {foo: "bar"} end end ...I do indeed get the expected JSON output. Have I simply got the syntax wrong?

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• ubuntu 12.10 installation failure

  - by Eidelmaim

  Here i am asking this question again because someone deemed it a duplicate to another topic which i over looked and NOTHING AT ALL in that topic pertained to my problem. If your going to close a topic believing it is a duplicate at least do somke reasearch into WHY you think its a duplicate and provide a like to a better source. How do i get past this installation username and password issue? I downloaded ubuntu 12.10 directly from Ubuntu.com and created a bootable USB with linuxlive. after loading the boot drive and ubuntu begins, it goes directly from the purple ubuntu startup screen directly to a black DOS like prompt asking for a ubuntu login. this is COMPLETLY before any installation -begins. i need some help with this. FYI : this is what it is saying after it goes to the login area in the DOS (Full black screen) like screen. Ubuntu 12.10 ubuntu tty1 ubuntu login: now i will provide a few images of the problem i am having. and because i DONT HAVE ANY OS on the computer BECAUSE ubuntu WONT go PAST this... i have to snap these pictuires with a cell phone and upload on another PC. these links are in chronological order from time of pressing power button to time i am presented with log in screen : image 1 image 2 can only post 2 links in messages... will post additional links in comments So, again... how do i get past this ? this is entireley before ubuntu is installed on my system. my PC specs... Homebuilt computer: Motherboard is a Asus Sabertooth x58 with a intel core i7 processor. Mushkin memory @ 12gbs. 4ea. Seagate 150gb hard drives. nvidia GTX 260 graphics card. i initially attempted to install to raid 5. failed. i broke down the raid and attempted to install to a single drive with all other drives disconnected from the PC. again, thanks in advanced for any assistance.

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• viewing the updated data in a file

  - by benjamin button

  If i have file for eg: a log file created by any background process on unix, how do i view the data that getting updated each and every time. i know that i can use tail command to see the file.but let's say i have used tail -10 file.txt it will give the last 10 lines.but if lets say at one time 10 lines got added and at the next instance it has been added 2 lines. now from the tail command i can see previous 8 lines also.i don't want this.i want only those two lines which were added. In short i want to view only those lines which were appended.how can i do this?

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• VC7.1 C1204 internal compiler error

  - by Nathan Ernst

  I'm working on modifying Firaxis' Civilization 4 core game DLL. The host application is built using VC7, hence the constraint (source not provided for the host EXE). I've been working on rewriting a large chunk of the code (focusing on low-hanging performance issues & memory leaks). I recently ran into an internal compiler error when trying to mod the code to use an array class instead of dynamically allocated 2-d arrays, I was going to use matrices from the boost lib (Civ4 is already using boost, so why not?). Basically, the issue comes down to: if I include "boost/numeric/ublas/matrix.hpp", I run into an internal compiler error C1204. MSDN has this to say: MSDN C1204 KB has this to say: KB 883655 So, I'm curious, is it possible to solve this error without a KB/SP being applied and dramatically reducing the complexity of the code? Additionally, as VC7 is no longer "supported", does anyone have a valid (supported) link for a VC7 service pack?

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• Java Array Comparison

  - by BlairHippo

  Working within Java, let's say I have two objects that, thanks to obj.getClass().isArray(), I know are both arrays. Let's further say that I want to compare those two arrays to each other -- possibly by using Arrays.equals. Is there a graceful way to do this without resorting to a big exhaustive if/else tree to figure out which flavor of Arrays.equals needs to be used? I'm looking for something that's less of an eyesore than this: if (obj1 instanceof byte[] && obj2 instanceof byte[]) { return Arrays.equals((byte[])obj1, (byte[])obj2); } else if (obj1 instanceof boolean[] && obj2 instanceof boolean[]) { ...

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• What every javascript programmer should know?

  - by gath

  Is there a set of things that every javascript programmer should know to be able to say "I know Javascript"

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• DurandalJS vs AngularJS?

  - by Zach

  I'm looking for a JS framework to build an SPA and found DurandalJS and AngularJS. Can anyone compare these two frameworks? I did find many articles that compares AngularJS and KnockoutJS, and they say AngularJS is more than data binding, so I think DurandalJS may be the one to compare. I did a little research on AngularJS, it is good but one thing is bad: the $ prefix does not work when minified, although there is an ugly workaround. And someone said Twitter Bootstrap does not work well with it (I didn't check). For DurandalJS, I still cannot find the samples (http://durandaljs.com/documentation/Understanding-the-Samples/), so it's hard to say. PS: are they working well with TypeScript? Best regards, Zach

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• Apache, Rewrite Rule and Directories

  - by milo5b

  my sites-available/ file looks something like the following: <VirtualHost *:80> ServerAdmin webmaster@mysite ServerName mysite.co.uk ServerAlias www.mysite.co.uk DocumentRoot /home/mysite.co.uk/htdocs/ <Directory /home/mysite.co.uk/htdocs/> Options -Indexes FollowSymlinks MultiViews AllowOverride All Order allow,deny allow from all </Directory> ErrorLog ${APACHE_LOG_DIR}/mysite.co.uk/error.log LogLevel warn CustomLog ${APACHE_LOG_DIR}/mysite.co.uk/access.log combined </VirtualHost> In .htaccess (in the htdocs/), I have (amongst others) the following rewrite rule: RewriteRule ^enquiries$ /enquiries.php Somehow I have also a directory named "enquiries" (/home/mysite.co.uk/htdocs/enquiries/), and when I hit the url "www.mysite.co.uk/enquiries" I get: HTTP/1.1 301 Moved Permanently Date: Mon, 10 Dec 2012 18:53:37 GMT Server: Apache/2.2.16 (Debian) Location: http://www.mysite.co.uk/enquiries/ Vary: Accept-Encoding Content-Type: text/html; charset=iso-8859-1 And a Browser would display the directory's content. Now, I could easily rename the folder and get it sorted, but I would like to understand what's going on here. What would be the correct way to configure Apache in a way that it wont behave this way, and instead would listen to the Rewrite Rule? If I did not explain myself clearly, please feel free to ask more questions, I'd be happy to answer them. Thanks!

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• What is the length of time to send a list of 200,000 integers from a client's browser to an internet

  - by indiehacker

  Over the connections that most people in the USA have in their homes, what is the approximate length of time to send a list of 200,000 integers from a client's browser to an internet sever (say Google app engine)? Does it change much if the data is sent from an iPhone? How does the length of time increase as the size of the integer list increases (say with a list of a million integers) ? Context: I wasn't sure if I should write code to do some simple computations and sorting of such lists for the browser in javascript or for the server in python, so I wanted to explore this issue of how long it takes to send the output data from a browser to a server over the web in order to help me decide where (client's browser or app engine server) is the best place for such computations to be processed.

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• Left Join 3 Tables and Show True or False on Empty Cells

  - by Jason Shultz

  Ok, this may be confusing so I hope I explain it correctly. I have 4 tables: business photos video category I want to display "featured" businesses on the home page (or elsewhere) and I want to show a Yes or No in the table row based upon whether or not there are photos or videos for that business. Example: Joes Crab Shack has no videos or photos but is featured. So, when his row is echoed out it will show the Business Name and Business Owner but there will be no data in the photo or video cells thus in the video and photos column it will say No. Otherwise, if the opposite was true, it would say Yes. Here's my pastebin

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• When do you learn from your mistakes?

  - by smayers81

  When are you supposed to learn from your mistakes in coding / design? Is it something you take with you to the next project or do you learn in the middle of your current one, sacrificing consistency for cleaner, more well-informed code? For example, my application can be distinctly demarcated down two lines of business -- say one side is for sales and the other is for marketing. Both are somewhat tied together, but as far as the team structure, use cases, developers, etc. the app consists of the Sales code and the Marketing Code. Now, say the Sales code went in first and while good-intentioned, made some bad mistakes. Should the Marketing Code follow suit and make the same mistakes for the sake of consistency or should Marketing architects and designers instead learn from the mistakes that Sales made and developer a cleaner codebase, even though Sales and Marketing are in the exact same system? Basically, do you learn from your mistakes while in a project or do you continue to pile crap on top of crap?

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• Rendering large and high poly meshes

  - by Aurus

  Consider an huge terrain that has a lot polygons, to render this terrain I thought of following techniques: Using height-map instead of raw meshes: Yes, but I want to create a lot of caves and stuff that simply wont work with height-maps. Using voxels: Yes, but I think that this would be to much since I don't even want to support changing terrain.. Split into multiple chunks and do some sort of LOD with the mesh: Yes, but how would I do that? Tessellation usually creates more detail not less. Precompute the same mesh in lower poly version (like Mudbox does) and depending on the distance it renders one of these meshes: Graphic memory is limited and uploading only the chunks won't solve that problem since the traffic would be too high. IMO the last one sounds really good, but imagine the following process: Upload and render the chunks depending on the current player position. [No problem] Player will walk straight forward Now we maybe have to change on of the low poly chunk with the high poly one So, Remove the low poly chunk and load the high poly chunk [Already to much traffic here, I think] I am not very experienced in graphic programming and maybe the upper process is totally okay but somehow I think it is too much. And how about the disk space it would require.. I think 3 kind of levels would be fine but isn't that also too much? (I am using OpenGL but I don't think that this is important)

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• Getting the starting shortcut in c#

  - by Flores

  Lets say that I have an executable and when it is started I want to know how it's started. I.e. I would like to know if it is started with a shortcut or directly. With this: string test = Environment.GetCommandLineArgs()[0]; I can get the path of the executable, but this is always the same, even if it's started by a shortcut. Lets say my executable is named c:\text.exe and I start it directly, then test = 'c:\test.exe' If I create a shortcut i.e. c:\shortcut.lnk (with target c:\test.exe) I want test to be 'c:\shortcut.exe' but it is 'c:\test.exe' I strongly suspect this to be impossible because the OS handles the shortcut part and the executable never can see the difference, but maybe someone has a creative idea?

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• HOW TO MAKE localization?

  - by hatemGamil

  hi all I have a question about localization how can i do localization lets say that i have a dropdown list that holds the available languages: English,french and arabic and I have a label which get it says "good morning",so i want to change the lang. according to selected lang. in drop down list so when the user chooses french label will say "bonjour" and when the user slect arabic the label will hold "???? ?????" AND MOVE IT FROM THE LEFT OF THE PAGE TO THE RIGHT BECAUSE ARABIC IS WRITTEN FROM RIGHT TO LEFT ,, ANY HELP WILL BE HIGHLY APPERCAITED THNX IN ADVACE

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• Parsing xml with dom4j or jdom or anyhow

  - by c0mrade

  Hello, I wanna read feed entries and I'm just stuck now. Take this for example : http://stackoverflow.com/feeds/question/2084883 lets say I wanna read all the summary node value inside each entry node in document. How do I do that? I've changed many variations of code this one is closest to what I want to achieve I think : Element entryPoint = document.getRootElement(); Element elem; for(Iterator iter = entryPoint.elements().iterator(); iter.hasNext();){ elem = (Element)iter.next(); System.out.println(elem.getName()); } It goes trough all nodes in xml file and writes their name. Now what I wanted to do next is if(elem.getName() == "entry") to get only the entry nodes, how do I get elements of the entry nodes, and how to get let say summary and its value? tnx

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• MS Environment: How to force link a static library to another using .vsprops, if possible?

  - by msbuildnewbie

  Environment: VS 2008 in Windows. Problem: A static library, say first.lib is not linked to, say second.lib, if first.lib is specified in .vsprops file and none of its functions is referenced in the second.lib. If, however, first.lib is removed from the .vsprops file and placed instead in the appropriate project options dialog(1), it is linked, even if its functions remain unreferenced. (1) Project - Properties - Configuration Properties - Linker - Input. Our solution uses .vsprops exclusively and to somehow be able to specify first.lib in such a file with additional tweaking of some settings would be considered a more elegant solution. Using a dummy function to pull in unused functions of first.lib is not an option. Thanks in advance.

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• Returning unique values of a multi-dimensional array with CodeIgniter PHP

  - by Michael Bradley

  Hi - I'm developing a property rentals website. The search results page will contain a list of property results. It is my intention to redefine the results, say by town, country, property type etc. So let's say for example the user searches 'France'. All of the relative properties will be returned and displayed in a list. However, I also need to reuse this array, to display only unique town names from the search results array. e.g. Montpellier, Lyon, Rennes, Nice etc. The idea is when use user click on 'Nice', only the 'Nice' properties would return. I would also like to display how many properties are in that town. The closest example as to what I want to achieve. http://www.miaandmaggie.com/dog-collars-leashes.html Any ideas how I can use my search array to display the unique towns of the search? Many thanks! M

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• How to upgrade ruby and rails in mac os snow leopard

  - by devlim

  I want to upgrade my Mac Snow Leopard ruby from 1.8.7 to 1.9.1 version, anyone know the painless and best way to upgrade? because i read some forum/post/blog/discussion say that is it not good to override the ruby that ship by apple and what the best way to upgrade rails from version 2.2.2 to 2.3.8? because all the information that i find either is for leopard/tiger only & few complicate article for snow leopard. and they also say is it not good to override the rails that ship by apple. anyone can help me? Thank.

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• Please for efficient query

  - by user278618

  I want to have efficient query to get some rows from my table. Here is I think the best presentation of my table. -Somedate is not duplicated - it is date of modifiedon -a,b,c are parent ids, let say countryCode -1,2,3,4 are subparent, let say citycode -guids are id of rows -true, false are values of rows - one can name this column - freshAir a 1 GUID somedate true a 1 GUID somedate true a 2 GUID somedate false a 2 GUID somedate false b 3 GUID somedate false b 3 GUID somedate false b 3 GUID somedate false b 4 GUID somedate false c 5 GUID somedate true c 6 GUID somedate true c 6 GUID somedate false c 6 GUID somedate false c 7 GUID somedate false I want the most recent rows MAX(modifiedon) grouped by countrycode and citycode and in this groups I need elements which have another values (true, false). And in result I want: a 1 GUID somedate true a 2 GUID somedate false c 5 GUID somedate true c 6 GUID somedate false c 7 GUID somedate false Look that in result I don't want to have records with "b", because all rows have the same value (false). Best regards

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• Ooutsourcing design/programming (taxes!)

  - by alexeypro

  Hello, I have a full time job, but I also have some ideas in mind -- and I want to outsource some code development and design to Russia. I have friends there who help me to do that -- they'll do the development, provide me invoice (which is just description of our terms, because we decided on flat rate monthly fee), and I need to wire them money. So, I do not have business entity. If I'll pay them, am I am required to pay taxes? Or do I deduct my business expenses (say $30K/year) from my earnings (say $50K/year), and pay taxes only on what's left ($20K to be precise)? Any rules on that? Am I limited with something here? Thanks!

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• Remove another program's frame/window/border (the Aero bit) using VB.NET

  - by Jonathan

  Is there a way to remove the border/frame (the Aero bit) of another application's window (say notepad) from a VB.NET program?

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• Searches (and general querying) with HBase and/or Cassandra (best practices?)

  - by alexeypro

  I have User model object with quite few fields (properties, if you wish) in it. Say "firstname", "lastname", "city" and "year-of-birth". Each user also gets "unique id". I want to be able to search by them. How do I do that properly? How to do that at all? My understanding (will work for pretty much any key-value storage -- first goes key, then value) u:123456789 = serialized_json_object ("u" as a simple prefix for user's keys, 123456789 is "unique id"). Now, thinking that I want to be able to search by firstname and lastname, I can save in: f:Steve = u:384734807,u:2398248764,u:23276263 f:Alex = u:12324355,u:121324334 so key is "f" - which is prefix for firstnames, and "Steve" is actual firstname. For "u:Steve" we save as value all user id's who are "Steve's". That makes every search very-very easy. Querying by few fields (properties) -- say by firstname (i.e. "Steve") and lastname (i.e. "l:Anything") is still easy - first get list of user ids from "f:Steve", then list from "l:Anything", find crossing user ids, an here you go. Problems (and there are quite a few): Saving, updating, deleting user is a pain. It has to be atomic and consistent operation. Also, if we have size of value limited to some value - then we are in (potential) trouble. And really not of an answer here. Only zipping the list of user ids? Not too cool, though. What id we want to add new field to search by. Eventually. Say by "city". We certainly can do the same way "c:Los Angeles" = ..., "c:Chicago" = ..., but if we didn't foresee all those "search choices" from the very beginning, then we will have to be able to create some night job or something to go by all existing User records and update those "c:CITY" for them... Quite a big job! Problems with locking. User "u:123" updates his name "Alex", and user "u:456" updates his name "Alex". They both have to update "f:Alex" with their id's. That means either we get into overwriting problem, or one update will wait for another (and imaging if there are many of them?!). What's the best way of doing that? Keeping in mind that I want to search by many fields? P.S. Please, the question is about HBase/Cassandra/NoSQL/Key-Value storages. Please please - no advices to use MySQL and "read about" SELECTs; and worry about scaling problems "later". There is a reason why I asked MY question exactly the way I did. :-)

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• Stuck at enemy movement

  - by Syed

  I am making a TD game in unity, Initially I made all of my enemy movements frame rate dependent say: I had a grid point1 at -22.65 and other at -21.1, diagrammatically: (-22.65) _________(-21.1)_______(-21.1+1.55) ...... so the distance on x axis between two points is 1.55, divided it by 25 jumps with each enemy jump of 0.062 of each frame. On reaching on next point of grid the enemy find again its path. All went fine until I have requirement of FastForward and Pause feature. I used timeScale property of unity but it wont work as they are frame dependent. I also tried double speed of enemy on clicking fast forward button at any time, it has some issues that enemy jumps are now less and it fails to reach on next grid point. Could someone suggest me solution to my problem. Do I need to change the enemy movement code to make it frame independent ?? I need the enemy to reach on the grid specific point I also need later to slow down any one enemy's speed when tower fires on it. Thnx

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