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• Specifying force and angle in ApplyImpulse in box2d

  - by Deepak Mahalingam

  I need to apply an impulse on a object with a particular force and at a particular angle in Box2d. If I am right the syntax would be the following: body.GetBody().ApplyImpulse(new b2Vec2(direction, power),body.GetBody().GetWorldCenter()); The problem is my direction is in angles. I found a discussion where it was said that the way we can convert an angle into a vector would be as: new b2Vec2(Math.cos(angle*Math.PI/180),Math.sin(angle*Math.PI/180)); Now I am not sure how to combine these two. In other words, if I wish to apply a force of 30 units at an angle of 30 degrees at the center of the object, how should I do it?

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• Inventory Item Exist checker

  - by Annalyne

  I have a question regarding declaring my inventory. I made it a string named inventory, with a constant number as its max value. The thing is, I want the user to use an item if he / she gains an item. The problem is, I do not know what syntax should I use to determine if the user has an item and use that item. Here's my code I just started: so declaring the inventory: const int MAX_ITEMS = 15; string game_inventory [MAX_ITEMS]; int itemnum = 0; I have some items like potion, antidote, gems and others. I use the: game_inventory[itemnum++] = "Potion" to place items in my inventory. If I want to use the potion, IF I HAVE one, how can i make a function to check whether I have a potion or anything and use it?

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• Factory for arrays of objects in python

  - by Vorac

  Ok, the title might be a little misleading. I have a Window class that draws widgets inside itself in the constructor. The widgets are all of the same type. So I pass a list of dictionaries, which contain the parameters for each widget. This works quite nicely, but I am worried that the interface to callers is obfuscated. That is, in order to use Window, one has to study the class, construct a correct list of dictionaries, and then call the constructor with only one parameter - widgets_params. Is this good or bad design? What alternatives does the python syntax provide?

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• How to work around the home directory changing to /root when using sudo?

  - by Nathanel Titane

  Hello everybody! With Natty coming out soon, I've been at work updating my deployment and self-config script to make my desktop on 11.04 run and look the way I want it to. One bummer is that dbus seems to have changed and does not permit, in the same manner Lucid and Maverick did, the authentication of the current user by terminal call using grep and cat. Ideally, to run the script, I would sudo -s and then launch it as # chmod +x install && ./install Instead of returning my user name.. it now returns root and applies changes to the root profile and aborts whenever paths do not correspond. Here is my script header: #!/bin/bash ON_USER=$(echo ~ | awk -F'/' '{ print $1 $2 $3 }' | sed 's/home//g') export $(grep -v "^#" ~/.dbus/session-bus/`cat /var/lib/dbus/machine-id`-0) if sudo -u $ON_USER test -z "$DBUS_SESSION_BUS_ADDRESS" ; then eval `sudo -u $ON_USER dbus-launch --sh-syntax --exit-with-session` fi RELEASE=$(lsb_release -cs) How could I make it return the actual user now that natty is coming? Thanks for the help

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• Why should I use a web framework's template language over python's templating options?

  - by stariz77

  I'm coming from a python CGI background and was wanting to move into something more contemporary and think I have decided upon web.py as the framework I would like to use. In regards to templating, previously I used formatted strings and the string.Template module to effect most of my templating needs. After reading through a few of the templating options I have heard mentioned, I began wondering what the main benefits of using something like the Django or jinja templating options over "native" Python templating options were? Am I just going to be replacing $tmpl_var with {{ tmpl_var }} and s.substitute(tmpl_var=value) with t.render(s), i.e., alternate syntax? or will I gain additional advantages from using these templating systems?

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• C++ Game Engine Book/Tutorial/Anything recent?

  - by TheNoob

  Before I get flamed, please understand that I have been looking for a while now. Yes, I have found a good amount of game engine tutorials...except filled with errors, out of date syntax, missing crucial information, and so on. Is there anywhere with a recent tutorial, or a book, anything at all? I'm not asking for an opinion in graphics API's, just a point in the right direction to get started on game engine development. I just want to make it clear, I have googled/stacked like crazy. Any help appreciated. Thank you.

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• Starting Game Programming in C++, where to begin for optimal cross-platform development?

  - by Qasim

  I wish to begin learning game development in C++. I have knowledge in syntax and the console using Visual C++ 2010, however I want to begin programming. My only problem is that I want to be able to support many platforms including Windows, Mac OS, and Linux. As I get better, I also hope I can submit games to XBLIG (or XBLA) and Steam, and even the Google Play Store (But that would take some porting and major redesign of controls). I have looked into c++ and SDL but I have no idea how to get started. I have Visual C++ 2010 installed and I hope I can still use that as other C++ IDEs are quit outdated. Because I want to stick with Visual C++ and SDL (unless there is a better library than SDL), there is not much room for debate but rather how to create projects to support cross-platform development.

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• How to run/test JavaScript? [closed]

  - by user702

  I'm reading David Flanagan's "JavaScript: The Definitive Guide, 6th ed". It only actually tells users how to run JS code on page 311, where users are told of the following solutions: "Client-side JavaScript code is embedded within HTML documents in four ways: Inline, between a pair of <script> and </script> tags From an external file specified by the src attribute in a <script> tag In an HTML event handler attribute, such as onclick or onmouseover In a URL that uses the special javascript: protocol." I was wondering what professional JS developers use to write and test their code: Do they use a good text editor with syntax high-lighting + autocompletion, hit F5 in the browser to reload the page every time they make a change, and use some add-on in the browser to investigate errors? Or are there full-fledged IDE's similar to MS VisualStudio for non-web languages?

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• Where to start when digging into an existing J2EE codebase?

  - by Jacob Krustchinsky

  I work for a company that produces enterprise applications to be used by schools and districts to manage all of their tests and standards data. Their existing application is written in J2EE and is very large. I personally am a seasoned PHP and Ruby = RoR developer and I have been asked to attempt to implement easily added but crucial features to an existing J2EE codebase. I am very familiar with Java SE and know the architecture of a web application well. What I am asking for is, will this suffice for the task ahead and what tips can you give me in digging into the code base and actually efficiently adding these new features? Is there anything important I need to know before beginning and what can I expect in terms of problems and issues coming from a Java SE, PHP, RoR background? Time isn't too much of an issue, I should have plenty of time to familiarize myself with J2EE.Please also note, syntax will not be a problem here.

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• How to install Syngen?

  - by inLoveWithPython

  I'm using Ubuntu 12.04. I found out that there is a near-obsolete program based on the obsolete Caml Special Light by someone at INRIA ( ftp.inria.fr, directory lang/caml-light ). The program is called Syngen. I need it to create Syntax diagrams. But i am not able to run the binaries that come with it, and i'm not able to compile the source because it needs a compiler called cmlc. Somebody help, i find REALLY less documentation about this in internet.

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• More complex learning source for C# .NET [closed]

  - by Leron

  By complex I don't mean more difficult but including a larger area of possibilities cover. I've started a few years ago with PHP and the transition from learning the syntax of the language and the basic logical structures to working with databases, including JavaScript and so on was very short. And now I'm more interested in studying working with languages like Java/C#. Recently I spend a lot of time reading and writing some simple console applications, I've read almost 2K pages for C# programming and still don't know how to connect to database for example. Just for info I'm interested in web development, socket programing and live streaming, don't know if I'm exceeding myself too much writing that but despite that I want to find some books/internet sources where I can extend my current knowledge of C#/.NET, start using database queries, maybe try something more complicated webwise.

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• How can I run everything as root

  - by Hermione

  I have dual booted to lubuntu (with Windows XP) and everytime and then I'm getting asked for my password. How do I run everything as root and not ask a password again? Ideally I wanted to run nginx but it has permission denied issues: apathetic@ubuntu:~$ service nginx start Starting nginx: nginx: [alert] could not open error log file: open() "/var/log/nginx/error.log" failed (13: Permission denied) 2012/08/03 20:06:25 [warn] 4762#0: the "user" directive makes sense only if the master process runs with super-user privileges, ignored in /etc/nginx/nginx.conf:1 nginx: the configuration file /etc/nginx/nginx.conf syntax is ok 2012/08/03 20:06:25 [emerg] 4762#0: open() "/var/run/nginx.pid" failed (13: Permission denied) nginx: configuration file /etc/nginx/nginx.conf test failed

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• Great F# getting started online book

  - by MarkPearl

  So I have been battling around with F# for a few weeks and it has been frustrating just getting my brain around the syntax etc. Then someone put a comment on my blog that I should check out the following online book called the F# Survival Guide. I highly recommend those wanting to get into the basics of the language to go through this resource. It is easy to understand, especially for someone coming from a C# background. Give it a read… it gets a two thumbs up from me!

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• How to replace avconv with (the real) ffmpeg and have it work right?

  - by u2n

  Anyone know how to install the real, current ffmpeg (not the older version by avconv that comes w/ Ubuntu) without having the problems mentioned here? Reasons: Everything works (or so many have written), Use the new syntax, and After some research -- and without getting into the controversy -- I simply believe the packagers made a mistake going with avconv. This is a fix. Apparently this isn't as easy as it should be due to versioning conflicts, and that avconv and ffmpeg can't coexist on the same machine (noted in the above post). Though at least one guide mentions installing ffmpeg locally (~) to achieve coexistence. My release is Precise 12.04.3 LTS, but it appears this would apply to newer ones also.

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• I cannot log in after theme change

  - by sssuizaaa

  After changing the gtk-theme in the gnome tweak took I was taken out of the session to the login screen and now I cannot log in. I can only log in using the guest account. So in the grub menu I selected the recovery mode and in the resulting menu I selected root-drop to root shell prompt. Once there I did a couple of things I've found in several pages and in the forums. 1.gsettings reset org.gnome.desktop.interface gtk-theme This is what I got: (process:642):WARNING: Command line 'dbus-launch –autolunch=4438d024dd45ef7fb2d3f4ab0000000f –binary-syntax --close-stderr' exited with non-zero exit status 1: Autolaunch error: X11 initialization failed.\n and nothing changes 2.gconftool-2 --type=string -s /desktop/gnome/interface/gtk_theme Radiance with this I was trying to change the gtk theme to the Radiance one. No strange message this time but it did not work either. I still cannot log in. Any ideas please?? sssuizaaa

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• If timestamp is deprecated, why do none of the current db tools support rowversion?

  Perhaps the title of this blog post will suffice, but I just wanted to highlight this problem. If you were to look up the timestamp data type in the SQL Server 2008 documentation, this is waht you will find within the topic article: The timestamp syntax is deprecated. This feature will be removed in a future version of Microsoft SQL Server. Avoid using this feature in new development work, and plan to modify applications that currently use this feature. Its been there for quite some time. The...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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• Listing SQL Columns

  - by Bunch

  When I am writing up stored procedures in SSMS sometimes I need to know what column types are used in a table. For instance I will know the table name but I might not remember exactly the length of a varchar column or if a column stored the data as an integer or varchar. And I may not want to scroll through all the tables in Object Explorer to find the one I want. A lot of times it is easier if I can just write a quick query to pull up the information I need. The syntax to do something like this is pretty easy. SELECT COLUMN_NAME, DATA_TYPE, CHARACTER_MAXIMUM_LENGTH FROM yourdbname.information_schema.columns WHERE TABLE_NAME = ‘yourtablename’ After running that you will get a listing in the Results pane just like any other query with the column name, data type and length (if any). Technorati Tags: SQL

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• Detect rotated rectangle collision

  - by handyface

  I'm trying to implement a script that detects whether two rotated rectangles collide for my game. I used the method explained in the following article for my implementation in Google Dart. 2D Rotated Rectangle Collision I tried to implement this code into my game. Basically from what I understood was that I have two rectangles, these two rectangles can produce four axis (two per rectangle) by subtracting adjacent corner coordinates. Then all the corners from both rectangles need to be projected onto each axis, then multiplying the coordinates of the projection by the axis coordinates (point.x*axis.x+point.y*axis.y) to make a scalar value and checking whether the range of both the rectangle's projections overlap. When all the axis have overlapping projections, there's a collision. First of all, I'm wondering whether my comprehension about this algorithm is correct. If so I'd like to get some pointers in where my implementation (written in Dart, which is very readable for people comfortable with C-syntax) goes wrong. Thanks!

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• Limitation of high level languages? [closed]

  - by user1705796

  My question may look bit philosophical and nonsense! But I need to know kind of instructions those are not well suitable in high level languages even in c? Or rarely use in the development of software? Like read/write content of CPU registers may useful in debugging programs. And access to cache memory required when developing OS (maybe I am wrong at this point). Is this kind of instruction available languages like Java, Python, C? I also have a second question: And Why all high level languages not having same uniform syntax; at-least same standard library interface name? In python there is and. Or operator is almost same as && and ||. I think Python is developed after C but space indentation is compulsory in Python. Why Python does not use brackets {}. I already know this question going to be highly down-voted.

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• C# 5 - asynch method callback with Task.ContinueWIth? [migrated]

  - by user1142433

  I have a method that pulls some HTML via the HttpClient like so: public static HttpClient web = new HttpClient(); public static async Task<string> GetHTMLDataAsync(string url) { string responseBodyAsText = ""; try { HttpResponseMessage response = await web.GetAsync(url); response.EnsureSuccessStatusCode(); responseBodyAsText = await response.Content.ReadAsStringAsync(); } catch (Exception e) { // Error handling } return responseBodyAsText; } I have another method that looks like so: private void HtmlReadComplete(string data) { // do something with the data } I would like to be able to call GetHTMLDataAsync and then have it call HtmlReadComplete on the UI thread when the html has been read. I naively thought this could somehow be done with something that looks like GetHTMLDataAsync(url).ContinueWith(HtmlReadComplete); But, I can't get the syntax correct, nor am I even sure that's the appropriate way to handle it. Thanks in advance!

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• Java - learning with a simple project

  - by phodu_insaan

  I remember when I learnt PHP, it was suggested that I code a simple blog or a forum after reading the language fundamentals and syntax. I was told/read that this would cover everything that I would learn about PHP in a beginners book. This advice was out there in a number of places, and after following and working with PHP it seems quite good advice. I am now learning Java, and reading the book Thinking in Java by Bruce Eckel. I wonder if there is any such set of similar, small projects that I could take up, that would cover all the essentials and most of what is covered in the book. Thanks.

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• How do you manage all of the information you have learned and found? [closed]

  - by B Seven

  Possible Duplicate: How do you manage your knowledge base? What do you use for personal note taking to keep track of everything you learn? Are you always Googling or searching StackOverflow to answer the same questions? Or searching for and copying and pasting existing code? I feel like I have a poor memory, especially remembering things like syntax. Are there any knowledge management systems that would work well for a programming language or operating system? It would be great if there were a way to save everything I learn in an easy to search system. Does such a thing exist? Maybe you would be able to search by question (How to sort an array?, How to set static IP?), or by tag (sort, array, enumeration, iterator, IP). I know it would be easy to develop my own system, but I thought it would be great to learn what works for other people.

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• What do you need to master a language and its technology? [closed]

  - by LongTTH

  Possible Duplicate: how to really master a programming language Let say about Java(just a sample, you can talk about C#, PHP, C++ ... it's just similar) and 10 (ten) levels, 1 is newbie and 10 is master. How can you identify someone at which level based on his knowledge? I do not tend to compare languages, I do tend to know what indicate a master or a newbie in a language and its (language's) based technology. Yeah, I know there aren't on earth a language stand alone, it always come with a technology with it. Let say in Java, you can memorize all of its keyword and syntax in just few days, but to know it (I mean do something with it effectively), you must read the Oracle (Sun) javadoc many many times (I'm not mention the 3rd party product yet).

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• How can I avoid the engineering mistakes of PDT?

  - by ashy_32bit

  As a developer with enough experience to evaluate a tool, I may say that PDT is very huge in size and slow in performance for a PHP IDE. It gets bigger by release and exponentially slower by the size of the projects. Add some extra syntax coloring rules and it literally crawls, code completion works randomly and building workspace takes like forever. Java black magic (-Xmx etc) eases the pain a little but that's it. So my questions are: Why is PDT like this? What design or engineering factors led to its poor performance? How can I avoid making these same mistakes in my own products?

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• Does GPG allow encryption of multiple files using a wild card like *filename*? [on hold]

  - by user47427

  I am trying to automate the encryption of files on a windows server using a .bat file I created. As long as the filename is hardcoded in the .bat file this works. I want to encrypt numerous files using this .bat file but files are not encrypted when I use wildcards in the filename like filename.txt. I've been trying various version of the following command at the DOS prompt to no avail. All attempts have returned syntax for usage. C:\gpg -v --batch -- yes --always-trust -e -r <encryption-key> *part-of-the-file-name* usage: gpg [options] --encrypt [filename] I received the same usage message with this command: C:\gpg -v --batch -- yes --always-trust -e -r --encrypt part-of-the-file-name I tried without the -v and some of the other options and I still received the same message. I have spent hours today searching the internet for an answer and I can't find one anywhere? Please help.

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