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  • gluLookAt doesn't work

    - by Tyzak
    hi, i'm programming with opengl and i want to change the camera view: ... void RenderScene() //Zeichenfunktion { glClearColor( 1.0, 0.5, 0.0, 0 ); glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT ); glLoadIdentity (); //1.Form: glBegin( GL_POLYGON ); //polygone glColor3f( 1.0f, 0.0f, 0.0f ); //rot glVertex3f( -0.5, -0.5, -0.5 ); //unten links 3 =3 koords, f=float glColor3f( 0.0f, 0.0f, 1.0f ); //blau glVertex3f( 0.5, -0.5, -0.5 ); //unten rechts glVertex3f( 0.5, 0.5, -0.5 );//oben rechts glVertex3f( -0.5, 0.5, -0.5 );//oben links glEnd(); Wuerfel(0.7); //creates cube with length 0.7 gluLookAt ( 0., 0.3, 1.0, 0., 0.7, 0., 0., 1., 0.); glFlush(); //Buffer leeren } ... when i change the parameter of gluLookAt, nothing happens, what do i wrong? thanks

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  • How to hide Thinking at Work so that the Non-Programmers don't suspect Slacking?

    - by stesch
    Better programmers than me can write in essays about walking around with a coffee mug and call it programming. And it's perfectly accepted at a place that knows the business. Or see what Gregory House (TV show "House M.D.") does when he is thinking. But what about the other places where you are the only programmer? If you don't stare at boring stuff on the monitor for 8 hours straight, co-workers suspect you being a slacker. Yes, not the managers who see the output. Only the co-workers who see the process and can't relate to this kind of work. Yesterday I had to explain to a trainee of some other profession that software development is like flying. The explanation from the Hitchhiker's Guide to the Galaxy. I don't think she bought it.

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  • Best Fit Scheduling Algorithim

    - by Teegijee
    I'm writing a scheduling program with a difficult programming problem. There are several events, each with multiple meeting times. I need to find an arrangement of meeting times such that each schedule contains any given event exactly once, using one of each event's multiple meeting times. Obviously I could use brute force, but that's rarely the best solution. I'm guessing this is a relatively basic computer science problem, which I'll learn about once I am able to start taking computer science classes. In the meantime, I'd prefer any links where I could read up on this, or even just a name I could Google.

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  • adding model validation errors in rescue

    - by ash34
    I have the following model with a virtual attribute class Mytimeperiod < ActiveRecord::Base validates presence of :from_dt validates_format_of :from_dt, :with => /\A\d{2}\/\d{2}\/\d{4}\Z/, :message => "format is mm/dd/yyyy" def from_dt self.from_date.strftime("%m/%d/%Y") if !self.from_date.blank? end def from_dt=(from_dt) self.from_date = Date.parse(from_dt) rescue self.errors.add_to_base("invalid from dt") end end I am using <%= f.error_messages %> to display the error messages on the form. I am using from_dt as a virtual attribute (string). The 'presence of' and 'format of' validation errors show up on the form, but when the user enters an invalid date format on the form and Date.Parse raises an exception I have a 'errors.add_to_base' statement in the rescue clause. Can anyone tell me why this error does not show up in the form error messages when I disable the 'format of' validation. thanks.

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  • Iterating over a HashMap with JSTL, always getting last Object

    - by hkansal
    Hello, I have a Map, which I tried to iterate over with JSTL. Somehow I could not accomplish even this basic task. I also referred the questions here and here, but that is what I am already doing, still no success. What I tried to do was: <c:forEach items="${myMap}" var="myEntry"> ${myEntry.key} + ${myEntry.value} </c:forEach> But I always get the last object. Maybe I am missing something trivial, please advise. Thank You

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  • how to set the background image property of a div to a dynamically generated image

    - by tixrus
    I have some divs and each one has its own background image. The base images as stored is just a black silhouette. What I would like to do is use the PHP GD package to modify the color of those images somewhat randomly and have the modified randomly coloured images be the background images of the divs. One way to do it is just create GD images structures from the original files, modify them, save the results as a temp file, pass this filename into the client, and then use jquery to modify the css background image properties of the divs to be the new file. But this is going to leave a lot of files laying around to garbage collect. Is there some way to do it without creating a bunch of files?

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  • "The left hand side of an assignment must be a variable" due to extra parentheses

    - by polygenelubricants
    I know why the following code doesn't compile: public class Main { public static void main(String args[]) { main((null)); // this is fine! (main(null)); // this is NOT! } } What I'm wondering is why my compiler (javac 1.6.0_17, Windows version) is complaining "The left hand side of an assignment must be a variable". I'd expect something like "Don't put parentheses around a method invokation, dummy!", instead. So why is the compiler making a totally unhelpful complaint about something that is blatantly irrelevant? Is this the result of an ambiguity in the grammar? A bug in the compiler? If it's the former, could you design a language such that a compiler would never be so off-base about a syntax error like this?

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  • Turn RSS into array, explode the 'description' and insert words into MySQL table one per row

    - by K.I
    I have only recently gotten into php and MySQL and I want to take an RSS feed, turn it into an array, take only the description part of the XML, explode it and insert it into a table on a MySQL base. I feel like this should be possible, but is a little over my head right now. I tried using magpie as a parser, but if possible I want to do it in simpler php code. The result I am looking for would take a description "This is a cat" and insert it into a table with two fields ID term 1 This 2 is 3 a 4 cat I've been stumped on this for a couple days. Any help would be great.

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  • How to finish a broken data upload to the production Google App Engine server?

    - by WooYek
    I was uploading the data to App Engine (not dev server) through loader class and remote api, and I hit the quota in the middle of a CSV file. Based on logs and progress sqllite db, how can I select remaining portion of data to be uploaded? Going through tens of records to determine which was and which was not transfered, is not appealing task, so I look for some way to limit the number of record I need to check. Here's relevant (IMO) log portion, how to interpret work item numbers? [DEBUG 2010-03-30 03:22:51,757 bulkloader.py] [Thread-2] [1041-1050] Transferred 10 entities in 3.9 seconds [DEBUG 2010-03-30 03:22:51,757 adaptive_thread_pool.py] [Thread-2] Got work item [1071-1080] <cut> [DEBUG 2010-03-30 03:23:09,194 bulkloader.py] [Thread-1] [1141-1150] Transferred 10 entities in 4.6 seconds [DEBUG 2010-03-30 03:23:09,194 adaptive_thread_pool.py] [Thread-1] Got work item [1161-1170] <cut> [DEBUG 2010-03-30 03:23:09,226 bulkloader.py] [Thread-3] [1151-1160] Transferred 10 entities in 4.2 seconds [DEBUG 2010-03-30 03:23:09,226 adaptive_thread_pool.py] [Thread-3] Got work item [1171-1180] [ERROR 2010-03-30 03:23:10,174 bulkloader.py] Retrying on non-fatal HTTP error: 503 Service Unavailable

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  • wm_mousewheel message in WTL

    - by Rushi
    I am trying to handle wm_mousewheel for my application. Code: BEGIN_MSG_MAP(DxWindow) MESSAGE_HANDLER(WM_MOUSEWHEEL, KeyHandler) END_MSG_MAP() . . . LRESULT DxWindow::KeyHandler( UINT uMsg, WPARAM wParam, LPARAM lParam, BOOL &bHandled ) { if(uMsg==wm_mousewheel) { //Perform task. } return 0; } But this code doesn't work.KeyHandler doesn't receive wm_mousewheel message. I am testing this application on vista. If my approach is wrong how to handle wm_mousewheel properly? Do vista is responsible for failure in handling wm_mousewheel message?

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  • Equality and Assigment Operators

    - by Jeremy Smith
    I have a assembly compiled in VB.NET that contains two operators: Public Shared Operator =(quarterA As CalendarQuarter, quarterB As CalendarQuarter) As Boolean Return quarterA.StartDate = quarterB.StartDate AndAlso quarterA.EndDate = quarterB.EndDate AndAlso quarterA.Quarter = quarterB.Quarter End Operator Public Shared Operator <>(quarterA As CalendarQuarter, quarterB As CalendarQuarter) As Boolean Return Not (quarterA = quarterB) End Operator However, when using the assembly in C# to perform equality checks if (qtr != null) I receive the error: Cannot implicity convert type 'object' to 'bool' My original intent with the = operator was only for assignment purposes in VB, so I may be way off base (I don't use custom operators too often). What do I need to do to make the operator behave with both equality and assignment operations?

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  • Frame.Navigate to an embedded resource F#

    - by akaphenom
    I have a 100% silverlight 3.0 / f# 2.0 application I am wrapping my brain around. I have the base application loading correctly - and now I want to add the naigation controls to it. My page is stored as an embedded resource - but the Frame.Navigate takes a URI. I know what I have is wrong but here it is: let nav : Frame = mainGrid ? mainFrame let url = "/page1.xaml" let uri = new System.Uri(url, System.UriKind.Relative) ; nav.Navigate uri Any thoughts?

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  • How can I reverse a stack?

    - by come pollinate me
    I need to write a VB.NET code to reverse the given characters using a stack. Input: 'S','T','A','C','K' So far I have input the letters, but I don't know how to get the console to reverse it. I'm a beginner to programming so please excuse my ignorance. An explanation as to how it's done would also be greatly appreciated. What I got so far. Module Module1 Sub Main() Dim StackObject As New Stack StackObject.Push("S") Console.WriteLine(StackObject.Peek) StackObject.Push("T") Console.WriteLine(StackObject.Peek) StackObject.Push("A") Console.WriteLine(StackObject.Peek) StackObject.Push("C") Console.WriteLine(StackObject.Peek) StackObject.Push("K") Console.WriteLine(StackObject.Peek) End Sub End Module I just need it to be reversed. I got it!! Module Module1 Sub Main() Dim StackObject As New Stack StackObject.Push("S") StackObject.Push("T") StackObject.Push("A") StackObject.Push("C") StackObject.Push("K") For Each cur As String In StackObject Console.WriteLine(cur) Next End Sub End Module That's how it's done.

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  • Terminate long running thread in thread pool that was created using QueueUserWorkItem(win 32/nt5).

    - by Jake
    I am programming in a win32 nt5 environment. I have a function that is going to be called many times. Each call is atomic. I would like to use QueueUserWorkItem to take advantage of multicore processors. The problem I am having is I only want to give the function 3 seconds to complete. If it has not completed in 3 seconds I want to terminate the thread. Currently I am doing something like this: HANDLE newThreadFuncCall= CreateThread(NULL,0,funcCall,&func_params,0,NULL); DWORD result = WaitForSingleObject(newThreadFuncCall, 3000); if(result == WAIT_TIMEOUT) { TerminateThread(newThreadFuncCall,WAIT_TIMEOUT); } I just spawn a single thread and wait for 3 seconds or it to complete. Is there anyway to do something similar to but using QueueUserWorkItem to queue up the work? Thanks!

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  • Why is my NSMutableArray returning nill?

    - by lampShade
    I have a very simple task: add the contents of a textField to an NSMutableArray.The Problem is the array is returning nill. I believe that it has something to do with the fact that the array I'm using is declared as an instance variable. /* IBOutlet NSTextField *textField; IBOutlet NSTabView *tableView; IBOutlet NSButton *button; NSMutableArray *myArray; */ #import "AppController.h" @implementation AppController -(IBAction)addNewItem:(id)sender { NSString *string = [textField stringValue]; NSLog(@"%@",string); [myArray addObject:string]; NSLog(@"%d",[myArray count]);//this outputs 0 why is that? }

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  • javascript callback after loop

    - by RobertPitt
    Hey guys, Iv'e just started a new Wordpress blog and i have started to build the JavaScript base! the issue im having is funnction a fucntion that loops several variables and includes the required JS libraries, what i need to do is execute the callback when the loop is finished! Heres my code! var Utilities = { Log : function(item) { if(console && typeof console.log == 'function') { //Chrome console.log(item); } }, LoadLibraries : function(callback) { $.each(Wordpress.required,function(i,val){ //Load the JS $.getScript(Wordpress.theme_root + '/js/plugins/' + val + '/' + val + '.js',function(){ // %/js/plugins/%/%.js Utilities.Log('library Loaded: ' + val); }); }); callback(); } } And the usage is like so! Utilities.LoadLibraries(function(){ Utilities.Log('All loaded'); }); Above you see the execution of callback() witch is being executed before the files are in the dom! i need this called at the end of every library inclusion!

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  • Advanced Java book in the lines of CLR via c# or C# in Depth?

    - by devoured elysium
    I want to learn about how things work in depth in Java. Coming from a c# background, there were a couple of very good books that go really deep in c# (C# in depth, CLR via c#, just to name the most popular). Is there anything like that in Java? I searched it up on amazon but nothing seemed to go that deep in Java as the two above go in c#. I don't want to know more about specific classes, or how to use this library or that other library, I want to learn how the objects are created on memory, how they get created on the stack, heap, etc. A more fundamental knowledge, let's say. I've read some chapters of Effective Java and The Java Programming Language but they don't seem to go so deep as I'd want them to go. Maybe there are other people that know both c# and Java that have read any of the referred books and know any that might be useful? Thanks

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  • What should every programmer know about security ?

    - by M.H
    I am an IT student and I am now in the 3rd year in university,until now we are studing a lot of subjects related to computer in general (Programming,Algorithms,Computer architecture,maths....etc). But there is a whole world called security we are very far from it ,I mean here security in general(Computers Security,Interner Security,Networks Security,hacking,cracking...etc). I am very sure that nobody can learn every thing about security but sure there is a "minimum" knowledge every programmer or IT student should know about it and my question is what is this minimum knowledge ? can you suggest some E-books or courses or any thing can help to start with this road ?

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  • Regular expression in BASH

    - by Ryan
    Hello everyone, I was hoping someone could answer my quick question as I am going nuts! I have recently started learning regular expressions in my Java programming however am a little confused how to get certain features to work correctly directly in BASH. For example, the following code is not working as I think it should. echo 2222 | grep '2\{2\}' I am expecting it to return: 22 I have tried variations of it including: echo 2222 | grep '2{2}' echo 2222 | grep -P '2\{2\}' echo 2222 | grep -E '2\{2\}' However I am completely out of ideas. I'm sure this is a simple parameter / syntax fix and would love some help! P.S I've done tons of googling and every reference I find does not work in BASH; regex's can run on so many different platforms and engines =/

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  • Reset Java Applet on page reload

    - by tommy-susanto
    I need to quit firefox and restart it in order for the applet to be refreshed... its anoying since i'm still programming it an the class files changes... am i missing some codes which makes it unable to refresh the applet and still take the one from the cache??? So I have a .jar applet in my website, a simulation game that spawns army whenever user clicks on the screen... however whenever I refresh the page, the previous army are still there on the screen.. I want it to be refreshed (as if we're just starting to run the application the first time). I already tried pressing CTRL+f5 but the trick doesn't seem to work I'd basically like to do it automatically using scripts or something, so that it won't require user to manually press some button on the keyboard Any Suggestions? I'd really appreciate it Thank you....

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  • Threading in C#

    - by Lalit Dhake
    Hi, I have console application. In that i have some process that fetch the data from database through different layers ( business and Data access). and generate outputs. This process will execute many times say 10 times. Ok? I want to run simultaneously this process. not one will start, it will finish and then second will start. I want after starting 1'st process, just 2'nd , 3rd....10'th must be start. Means it should be multithreading. how can i achieve this ? is that will give me error while connection with data base open and close ?

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  • Choosing a source control system: logical next steps after VSS

    - by Dave
    I've been using Git for the past few months and love it. I looked into how to host it in a corporate environment. Considering a 10 person team who use Visual SourceSafe, programming in Coldfusion, Powerbuilder, PHP and a bit of .NET, I found, to my surprise, that the Git 'server' tooling is still fairly rudimentary. http://stackoverflow.com/questions/1761054/git-in-a-company-hosting-own-server Question Apart from SVN, what other source control options would be a logical next step after VSS? Paid options are fine. Something with nice tooling, that isn't scary would be great :-)

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  • Using C# and VB.NET in one solution

    - by Younes
    I'm busy on a small project to convert an Access2003 db to .NET. I am trying to integrate my functionality in an excisting project that is being used for Administration of some kind. The code in this project is vb.net. I started by setting up my Data Access Layer, which seems to work fine. I can make new web pages that acces the data I need. However when i start to use class files to set up my Business Logic Layer i can't build my project when using C# instead of VB. I Dislike VB and like to program in C# as i know the syntax alot better etc. Is it possible to program using C# knowing that VB.NET was the language chosen to buold the entire project on? If not, what will be the smartest way to integrate my module into the project using my favorite programming language? (Make a project and reference to the dll?)

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  • Is it worthwhile learning about Emacs? [closed]

    - by dole doug
    Hi there Some time ago, I've heard what a great tool Emacs can be. I've read some papers about it and some watched some video too. I've read that emacs is great not only for developers but for usual users too...so i decided to start learning how to use it and wok with it. The problem is that I'm a MS Windows user and I learn in my spare time PHP and C(I also did some products on those languages, but i still considering myself in learning stage). Another problem is that I learn alone (no friends around to ask/learn from them, programming related stuff). Can you give me some tips about how to use those type of tools(especially those written for gnu/unix) with "poor" GUI but rich features? Do you recommend to use the specific windows written applications only and forget about those which come from GNU?

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  • What is your best programmer joke?

    - by hmason
    When I teach introductory computer science courses, I like to lighten the mood with some humor. Having a sense of fun about the material makes it less frustrating and more memorable, and it's even motivating if the joke requires some technical understanding to 'get it'! I'll start off with a couple of my favorites: Q: How do you tell an introverted computer scientist from an extroverted computer scientist? A: An extroverted computer scientist looks at your shoes when he talks to you. And the classic: Q: Why do programmers always mix up Halloween and Christmas? A: Because Oct 31 == Dec 25! I'm always looking for more of these, and I can't think of a better group of people to ask. What are your best programmer/computer science/programming jokes?

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