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  • GPL'ing code of a third party?

    - by Mark
    I am facing the following dilemma at the moment. I am using code from a scientific paper in a commercial project. So basically I copied and pasted the code from the paper's pdf into my code editor and use it in my own code. The code in the paper does not have any copy restrictions or license(like the GPL) so I thought I would be ok using it in a commercial project. However, I have seen several gpl licensed open source projects that use the exact same code from the paper to the point of having the same variable names like in the paper. So what happened here is that a gpl license was put on a third parties non gpl'ed code. Are these open source projects in violation of the gpl or would I be in violation of the gpl because I use code which has been gpl'ed? My common sense tells me it is not allowed to gpl somebody elses non-gpl'ed (like in this case from the paper) code but I though I would ask anyway.

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  • Is there a way to check if redistributed code has been altered?

    - by onlineapplab.com
    I would like to redistribute my app (PHP) in a way that the user gets the front end (presentation) layer which is using the API on my server through a web service. I want the user to be able to alter his part of the app but at the same time exclude such altered app from the normal support and offer support on pay by the hour basis. Is there a way to check if the source code was altered? Only solution I can think of would be to get check sums of all the files then send it through my API and compare them with the original app. Is there any more secure way to do it so it would be harder for the user to break such protection?

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  • "// ..." comments at end of code block after } - good or bad?

    - by gablin
    I've often seen such comments be used: function foo() { ... } // foo while (...) { ... } // while if (...) { ... } // if and sometimes even as far as if (condition) { ... } // if (condition) I've never understood this practice and thus never applied it. If your code is so long that you need to know what this ending } is then perhaps you should consider splitting it up into separate functions. Also, most developers tools are able to jump to the matching bracket. And finally the last is, for me, a clear violation to the DRY principle; if you change the condition you would have to remember to change the comment as well (or else it could get messy for the maintainer, or even for you). So why do people use this? Should we use it, or is it bad practice?

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  • Who owns the code, who owns the algorithm, who owns the idea?

    - by Vorac
    This question got me thinking what products of the programming effort belong to the employer, and what don't. The two extremes are (0) the code - it apparently belongs to the employer and (1) the learned personal and technical skills. But what is in between? Who owns the pseudocode/algorithm? Who owns the general idea of the algorithm? Who owns the know-how that such an algorithm may serve some useful purpose (e.g. on this site questions are values, as well as answers)? Also: Who owns an idea on the web?

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  • "// ..." comments at end of code block after } - good or bad?

    - by gablin
    I've often seen such comments be used: function foo() { ... } // foo while (...) { ... } // while if (...) { ... } // if and sometimes even as far as if (condition) { ... } // if (condition) I've never understood this practice and thus never applied it. If your code is so long that you need to know what this ending } is then perhaps you should consider splitting it up into separate functions. Also, most developers tools are able to jump to the matching bracket. And finally the last is, for me, a clear violation to the DRY principle; if you change the condition you would have to remember to change the comment as well (or else it could get messy for the maintainer, or even for you). So why do people use this? Should we use it, or is it bad practice?

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  • MVC: model of type Nullable<T>

    - by Fyodor Soikin
    I have a partial view that inherits from ViewUserControl<Guid?> - i.e. it's model is of type Nullable<Guid>. Very simple view, nothing special, but that's not the point. Somewhere else, I do Html.RenderPartial( "MyView", someGuid ), where someGuid is of type Nullable<Guid>. Everything's perfectly legal, should work OK, right? But here's the gotcha: the second argument of Html.RenderPartial is of type object, and therefore, Nullable<Guid> being a value type, it must be boxed. But nullable types are somehow special in the CLR, so that when you box one of those, you actually get either a boxed value of type T (Nullable's argument), or a null if the nullable didn't have a value to begin with. And that last case is actually interesting. Turns out, sometimes, I do have a situation when someGuid.HasValue == false. And in those cases, I effectively get a call Html.RenderPartial( "MyView", null ). And what does the HtmlHelper do when the model is null? Believe it or not, it just goes ahead and takes the parent view's model. Regardless of it's type. So, naturally, in those cases, I get an exception saying: "The model item passed into the dictionary is of type 'Parent.View.Model.Type', but this dictionary requires a model item of type 'System.Guid?'" So the question is: how do I make MVC correctly pass new Nullable<Guid> { HasValue = false } instead of trying to grab the parent's model? Note: I did consider wrapping my Guid? in an object of another type, specifically created for this occasion, but this seems completely ridiculous. Don't want to do that as long as there's another way. Note 2: now that I've wrote all this, I've realized that the question may be reduced to how to pass a null for model without ending up with parent's model?

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  • rails Creating a model instance automatically when another is created

    - by bob
    Hello I have a user model and a ratings model. Whenever a new user is created I want to create a new feedback model with it automatically. Each user model has one feedback model and each feedback model has many ratings. My Classes class User < ActiveRecord::Base end class Feedback < ActiveRecord::Base belongs_to :user has_many :ratings end class Rating < ActiveRecord::Base belongs_to :feedback end My database tables -user doesn't have anything special -feedback has user_id. This user_id should be the same as the user that has just been created. For example, user_id of 1 is created, then a feedback model should be created that belongs to user_id of 1. So the user_id column in the feedback database will also be 1. - Rating has a feedback_id and a user_id the user_id in this case is the id of the person who submitted the rating. I am having it assigned through the build command. I believe my process is correct here. The Goal The goal is to have each user have a feedback table that has many ratings from other users. So if someone goes to the feedback page, they will see all the ratings given and by who. Is there a better way to approach this? How do you create a model of feedback with the same id as the user being created right when a new user is created. The idea is that when a user is created a feedback is created associated with that user so people can then go to http://localhost:3000/users/1/feedback/ and submit new ratings. I'm trying to bypass having a user rate another user with just a ratings model because I'm not sure how to do it.

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  • Cannot redeclare class error when generating PHPUnit code coverage report

    - by Cobby
    Starting a project with Zend Framework 1.10 and Doctrine 2 (Beta1). I am using namespaces in my own library code. When generating code coverage reports I get a Fatal Error about Redeclaring a class. To provide more info, I've commented out the xdebug_disable() call in my phpunit executable so you can see the function trace (disabled local variables output because there was too much output). Here's my Terminal output: $ phpunit PHPUnit 3.4.12 by Sebastian Bergmann. ........ Time: 4 seconds, Memory: 16.50Mb OK (8 tests, 14 assertions) Generating code coverage report, this may take a moment.PHP Fatal error: Cannot redeclare class Cob\Application\Resource\HelperBroker in /Users/Cobby/Sites/project/trunk/code/library/Cob/Application/Resource/HelperBroker.php on line 93 PHP Stack trace: PHP 1. {main}() /usr/local/zend/bin/phpunit:0 PHP 2. PHPUnit_TextUI_Command::main() /usr/local/zend/bin/phpunit:54 PHP 3. PHPUnit_TextUI_Command-run() /usr/local/zend/share/pear/PHPUnit/TextUI/Command.php:146 PHP 4. PHPUnit_TextUI_TestRunner-doRun() /usr/local/zend/share/pear/PHPUnit/TextUI/Command.php:213 PHP 5. PHPUnit_Util_Report::render() /usr/local/zend/share/pear/PHPUnit/TextUI/TestRunner.php:478 PHP 6. PHPUnit_Framework_TestResult-getCodeCoverageInformation() /usr/local/zend/share/pear/PHPUnit/Util/Report.php:97 PHP 7. PHPUnit_Util_Filter::getFilteredCodeCoverage() /usr/local/zend/share/pear/PHPUnit/Framework/TestResult.php:623 Fatal error: Cannot redeclare class Cob\Application\Resource\HelperBroker in /Users/Cobby/Sites/project/trunk/code/library/Cob/Application/Resource/HelperBroker.php on line 93 Call Stack: 0.0004 322888 1. {main}() /usr/local/zend/bin/phpunit:0 0.0816 4114628 2. PHPUnit_TextUI_Command::main() /usr/local/zend/bin/phpunit:54 0.0817 4114964 3. PHPUnit_TextUI_Command-run() /usr/local/zend/share/pear/PHPUnit/TextUI/Command.php:146 0.1151 5435528 4. PHPUnit_TextUI_TestRunner-doRun() /usr/local/zend/share/pear/PHPUnit/TextUI/Command.php:213 4.2931 16690760 5. PHPUnit_Util_Report::render() /usr/local/zend/share/pear/PHPUnit/TextUI/TestRunner.php:478 4.2931 16691120 6. PHPUnit_Framework_TestResult-getCodeCoverageInformation() /usr/local/zend/share/pear/PHPUnit/Util/Report.php:97 4.2931 16691148 7. PHPUnit_Util_Filter::getFilteredCodeCoverage() /usr/local/zend/share/pear/PHPUnit/Framework/TestResult.php:623 (I have no idea why it shows the error twice...?) And here is my phpunit.xml: <phpunit bootstrap="./code/tests/application/bootstrap.php" colors="true"> <!-- bootstrap.php changes directory to trunk/code/tests, all paths below are relative to this directory. --> <testsuite name="My Promotions"> <directory>./</directory> </testsuite> <filter> <whitelist> <directory suffix=".php">../application</directory> <directory suffix=".php">../library/Cob</directory> <exclude> <!-- By adding the below line I can remove the error --> <file>../library/Cob/Application/Resource/HelperBroker.php</file> <directory suffix=".phtml">../application</directory> <directory suffix=".php">../application/doctrine</directory> <file>../application/Bootstrap.php</file> <directory suffix=".php">../library/Cob/Tools</directory> </exclude> </whitelist> </filter> <logging> <log type="junit" target="../../build/reports/tests/report.xml" /> <log type="coverage-html" target="../../build/reports/coverage" charset="UTF-8" yui="true" highlight="true" lowUpperBound="50" highLowerBound="80" /> </logging> </phpunit> I have added a tag inside the which seams to hide this problem. I do have another application resource but it doesn't seam to have a problem (the other one is a Doctrine 2 resource). I'm not sure why it is specific to this class, my entire library is autoloaded so their isn't any include/require calls anywhere. I guess it should be noted that HelperBroker is the first file in the filesystem stemming out from library/Cob I am on Snow Leopard with the latest/recent versions of all software (Zend Server, Zend Framework, Doctrine 2 Beta1, Phing, PHPUnit, PEAR).

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  • Java MVC project - either I can't update the drawing, or I can't see it

    - by user1881164
    I've got a project based around the Model-View-Controller paradigm, and I've been having a lot of trouble with getting it to work properly. The program has 4 panels, which are supposed to allow me to modify an oval drawn on the screen in various ways. These seem to work fine, and after considerable trouble I was able to get them to display in the JFrame which holds the whole shebang. I've managed to get them to display by breaking away from the provided instructions, but when I do that, I can't seem to get the oval to update. However, if I follow the directions to the letter, I only ever see an empty frame. The project had pretty specific directions, which I followed up to a point, but some of the documentation was unclear. I think what I'm missing must be something simple, since nothing is jumping out at me as not making sense. I have to admit though that my Java experience is limited and my experience with GUI design/paradigms is even more so. Anyway, I've been searching the web and this site extensively trying to figure out what's wrong, but this is a somewhat specific example and honestly I just don't know enough about this to generalize any of the answers I've found online and figure out what's missing. I've been poring over this code for far too long now so I'm really hoping someone can help me out. public class Model { private Controller controller; private View view; private MvcFrame mvcFrame; private int radius = 44; private Color color = Color.BLUE; private boolean solid = true; //bunch of mutators and accessors for the above variables public Model() { controller = new Controller(this); view = new View(this); mvcFrame = new MvcFrame(this); } } Here's the model class. This seems to be fairly simple. I think my understanding of what's going on here is solid, and nothing seems to be wrong. Included mostly for context. public class Controller extends JPanel{ private Model model; public Controller(Model model) { this.model = model; setBorder(BorderFactory.createLineBorder(Color.GREEN)); setLayout(new GridLayout(4,1)); add(new RadiusPanel(model)); add(new ColorPanel(model)); add(new SolidPanel(model)); add(new TitlePanel(model)); } } This is the Controller class. As far as I can tell, the setBorder, setLayout, and series of adds do nothing here. I had them commented out, but this is the way that the instructions told me to do things, so either there's a mistake there or something about my setup is wrong. However, when I did it this way, I would get an empty window (JFrame) but none of the panels would show up in it. What I did to fix this is put those add functions in the mvcFrame class: public class MvcFrame extends JFrame { private Model model; public MvcFrame(Model model){ this.model = model; //setLayout(new GridLayout(4,1)); //add(new RadiusPanel(model)); //add(new ColorPanel(model)); //add(new SolidPanel(model)); //add(new TitlePanel(model)); //add(new View(model)); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); setLocationRelativeTo(null); setSize(800,600); setVisible(true); } } So here's where things kind of started getting weird. The first block of commented out code is the same as what's in the Controller class. The reason I have it commented out is because that was just a lucky guess - it's not supposed to be like that according to the instructions. However, this did work for getting the panels to show up - but at that point I was still tearing my hair out trying to get the oval to display. The other commented line ( add(new View(model)); ) was a different attempt at making things work. In this case, I put those add functions in the View class (see commented out code below). This actually worked to display both the oval and the panels, but that method wouldn't allow me to update the oval. Also, though I just had the oval displaying, I can't seem to figure out what exactly made that happen, and I can't seem to make it come back. public class View extends JPanel{ private Model model; public View(Model model) { this.model = model; //setLayout(new GridLayout(4,1)); //add(new RadiusPanel(model)); //add(new ColorPanel(model)); //add(new SolidPanel(model)); //add(new TitlePanel(model)); repaint(); } @Override protected void paintComponent(Graphics g){ super.paintComponent(g); //center of view panel, in pixels: int xCenter = getWidth()/2; int yCenter = getHeight()/2; int radius = model.getRadius(); int xStart = xCenter - radius; int yStart = yCenter - radius; int xWidth = 2 * radius; int yHeight = 2 * radius; g.setColor(model.getColor()); g.clearRect(0, 0, getWidth(), getHeight()); if (model.isSolid()){ g.fillOval(xStart, yStart, xWidth, yHeight); } else { g.drawOval(xStart, yStart, xWidth, yHeight); } } } Kinda same idea as before - the commented out code is stuff I added to try to get things working, but is not based on the provided directions. In the case where that stuff was uncommented, I had the add(new View(model)); line from the mvcFrame line uncommented as well. The various panel classes (SolidPanel, ColorPanel, etc) simply extend a class called ControlPanel which extends JPanel. These all seem to work as expected, not having much issue with them. There is also a driver which launches the GUI. This also seems to work as expected. The main problem I'm having is that I can't get the oval to show up, and the one time I could make it show up, none of the options for changing it seemed to work. I feel like I'm close but I'm just at a loss for other things to try out at this point. Anyone who can help will have my sincerest gratitude.

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  • How to play a embedded code in lightbox type popup

    - by Fero
    Hi all How to play a embedded code in lightbox type pop up? Here is the whole code <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en"> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /> <meta http-equiv="imagetoolbar" content="no" /> <title>FancyBox 1.3.1 | Demonstration</title> <script type="text/javascript" src="http://code.jquery.com/jquery-1.4.2.min.js"></script> <script type="text/javascript" src="./fancybox/jquery.mousewheel-3.0.2.pack.js"></script> <script type="text/javascript" src="./fancybox/jquery.fancybox-1.3.1.js"></script> <link rel="stylesheet" type="text/css" href="./fancybox/jquery.fancybox-1.3.1.css" media="screen" /> <link rel="stylesheet" href="style.css" /> <script type="text/javascript"> $(document).ready(function() { /* * Examples - images */ $("a#example1").fancybox({ 'titleShow' : false }); $("a#example2").fancybox({ 'titleShow' : false, 'transitionIn' : 'elastic', 'transitionOut' : 'elastic' }); $("a#example3").fancybox({ 'titleShow' : false, 'transitionIn' : 'none', 'transitionOut' : 'none' }); $("a#example4").fancybox(); $("a#example5").fancybox({ 'titlePosition' : 'inside' }); $("a#example6").fancybox({ 'titlePosition' : 'over' }); $("a[rel=example_group]").fancybox({ 'transitionIn' : 'none', 'transitionOut' : 'none', 'titlePosition' : 'over', 'titleFormat' : function(title, currentArray, currentIndex, currentOpts) { return '<span id="fancybox-title-over">Image ' + (currentIndex + 1) + ' / ' + currentArray.length + (title.length ? ' &nbsp; ' + title : '') + '</span>'; } }); /* * Examples - various */ $("#various1").fancybox({ 'titlePosition' : 'inside', 'transitionIn' : 'none', 'transitionOut' : 'none' }); $("#various2").fancybox(); $("#various3").fancybox({ 'width' : '75%', 'height' : '75%', 'autoScale' : false, 'transitionIn' : 'none', 'transitionOut' : 'none', 'type' : 'iframe' }); $("#various4").fancybox({ 'padding' : 0, 'autoScale' : false, 'transitionIn' : 'none', 'transitionOut' : 'none' }); }); </script> </head> <body> <div id="content"> <p> <a id="example1" href="./example/1_b.jpg"><img alt="example1" src="./example/1_s.jpg" /></a> <a id="example2" href="./example/2_b.jpg"><img alt="example2" src="./example/2_s.jpg" /></a> <a id="example3" href="./example/3_b.jpg"><img alt="example3" src="./example/3_s.jpg" /></a> </p> </div> <div><p>&nbsp;</p></div> </body> </html> This above code working for image perfectly. But how shall i play the embedded code instead of image. Here is the sample embedded code. <object width="480" height="385"><param name="movie" value="http://www.youtube.com/v/WUW5g-sL8pU&hl=en_US&fs=1&"></param><param name="allowFullScreen" value="true"></param><param name="allowscriptaccess" value="always"></param><embed src="http://www.youtube.com/v/WUW5g-sL8pU&hl=en_US&fs=1&" type="application/x-shockwave-flash" allowscriptaccess="always" allowfullscreen="true" width="480" height="385"></embed></object> thanks in advance...

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  • How would the 'Model' in a Rails-type webapp be implemented in a functional programming langauge?

    - by ceptorial
    In MVC web development frameworks such as Ruby on Rails, Django, and CakePHP, HTTP requests are routed to controllers, which fetch objects which are usually persisted to a backend database store. These objects represent things like users, blog posts, etc., and often contain logic within their methods for permissions, fetching and/or mutating other objects, validation, etc. These frameworks are all very much object oriented. I've been reading up recently on functional programming and it seems to tout tremendous benefits such as testability, conciseness, modularity, etc. However most of the examples I've seen for functional programming implement trivial functionality like quicksort or the fibonnacci sequence, not complex webapps. I've looked at a few 'functional' web frameworks, and they all seem to implement the view and controller just fine, but largely skip over the whole 'model' and 'persistence' part. (I'm talking more about frameworks like Compojure which are supposed to be purely functional, versus something Lift which conveniently seems to use the OO part of Scala for the model -- but correct me if I'm wrong here.) I haven't seen a good explanation of how functional programming can be used to provide the metaphor that OO programming provides, i.e. tables map to objects, and objects can have methods which provide powerful, encapsulated logic such as permissioning and validation. Also the whole concept of using SQL queries to persist data seems to violate the whole 'side effects' concept. Could someone provide an explanation of how the 'model' layer would be implemented in a functionally programmed web framework?

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  • What does this model error says in asp.net mvc?

    - by Pandiya Chendur
    My Html action link takes me to a view where i can see the details.. For Ex:http://localhost:1985/Materials/Details/4 But it shows error, The model item passed into the dictionary is of type 'System.Data.Linq.DataQuery`1[CrMVC.Models.ConstructionRepository+Materials]' but this dictionary requires a model item of type 'CrMVC.Models.ConstructionRepository+Materials'. And my model is... public IQueryable<Materials> GetMaterial(int id) { return from m in db.Materials join Mt in db.MeasurementTypes on m.MeasurementTypeId equals Mt.Id where m.Mat_id == id select new Materials() { Id = Convert.ToInt64(m.Mat_id), Mat_Name = m.Mat_Name, Mes_Name = Mt.Name, }; } public class Materials { private Int64 id; public string mat_Name; public string mes_Name; public Int64 Id { get { return id; } set { id = value; } } public string Mat_Name { get { return mat_Name; } set { mat_Name = value; } } public string Mes_Name { get { return mes_Name; } set { mes_Name = value; } } } } and my controller method... public ActionResult Details(int id) { var material = consRepository.GetMaterial(id).AsQueryable(); return View("Details", material); } Any suggestion what am i missing here?

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  • Should I put actors in the Domain-Model/Class-Diagram?

    - by devoured elysium
    When designing both the domain-model and class-diagrams I am having some trouble understanding what to put in them. I'll give an example of what I mean: I am doing a vacations scheduler program, that has an Administrator and End-Users. The Administrator does a couple of things like registering End-Users in the program, changing their previleges, etc. The End-User can choose his vacations days, etc. I initially defined an Administrator and End-User as concepts in the domain-model, and later as classes in the class-diagram. In the class-diagram, both classes ended up having a couple of methods like Administrator.RegisterNewUser(); Administrator.UnregisterUser(int id); etc. Only after some time I realised that actually both Administrator and End-User are actors, and maybe I got this design totally wrong. Instead of filling Administrator and End-User classes with methods to do what my Use-Cases request, I could define other classes from the domain to do them, and have controllers handle the Use-Cases(actually, I decided to do one for each Use-Case). I could have a UserDatabase.RegisterNewUser() and UserDatabase.UnregisterUser(int id);, for example, instead of having those methods on the Administrator class. The idea would be to try to think of the whole vacation-scheduler as a "closed-program" that has a set of features and doesn't bother with things such as authentication, that should be internal/protected, being that the only public things I'd let the outside world see would be its controllers. Is this the right approach? Or am I getting this totally wrong? Is it generally bad idea to put Actors in the domain-model/class-diagrams? What are good rules of thumb for this? My lecturer is following Applying UML and Patterns, which I find awful, so I'd like to know where I could look up more info on this described actor-models situation. I'm still a bit confused about all of this, as this new approach is radically different from anything I've done before.

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  • MVC 3, View Model for user registration process. Password validation not working properly

    - by sec_goat
    I am trying to create a user registration page using MVC 3, so that I can better understand the process of how it works, what's going on behind the scenes etc. I am running into some issues when trying to use [Compare] to check to see that the user entered the same password twice. I tried adding the ComparePassword field to my user model first, and found that would not work the way I wanted as I did not have the field in the database, so the obvious answer was to create a View Model using the same information including the ComparePassword field. So I now have created a User model and a RegistrationViewModel, however it appears that the [Compare] on the password is not returning anything, for instance no matter what I put in the two boxes, when I click create it gives no error, which seems to me to mean it was successfully validated. I am not sure what I am doing or not doing to make this work properly. I have tried updating the jQuery.Validate to the newest version as there were some bugs reported in older version, this has not helped my efforts. Below is a wall of code, that is what I am working with. } public class RegistrationViewModel { [Required] [StringLength(15, MinimumLength = 3)] [Display(Name = "User Name")] [RegularExpression(@"(\S)+", ErrorMessage = " White Space is not allowed in User Names")] [ScaffoldColumn(false)] public String Username { get; set; } [Required] [StringLength(15, MinimumLength = 3)] [Display(Name = "First Name")] public String firstName { get; set; } [Required] [StringLength(15, MinimumLength = 3)] [Display(Name = "Last Name")] public String lastName { get; set; } [Required] [Display(Name = "Email")] public String email { get; set; } [Required] [Display(Name = "Password")] [DataType(DataType.Password)] public String password { get; set; } [Required] [DataType(DataType.Password)] [Display(Name = "Re-enter Password")] [Compare("Password", ErrorMessage = "Passwords do not match.")] public String comparePassword { get; set; } }

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  • Create bullet physics rigid body along the vertices of a blender model

    - by Krishnabhadra
    I am working on my first 3D game, for iphone, and I am using Blender to create models, Cocos3D game engine and Bullet for physics simulation. I am trying to learn the use of physics engine. What I have done I have created a small model in blender which contains a Cube (default blender cube) at the origin and a UVSphere hovering exactly on top of this cube (without touching the cube) I saved the file to get MyModel.blend. Then I used File -> Export -> PVRGeoPOD (.pod/.h/.cpp) in Blender to export the model to .pod format to use along with Cocos3D. In the coding side, I added necessary bullet files to my Cocos3D template project in XCode. I am also using a bullet objective C wrapper. -(void) initializeScene { _physicsWorld = [[CC3PhysicsWorld alloc] init]; [_physicsWorld setGravity:0 y:-9.8 z:0]; /*Setup camera, lamp etc.*/ .......... ........... /*Add models created in blender to scene*/ [self addContentFromPODFile: @"MyModel.pod"]; /*Create OpenGL ES buffers*/ [self createGLBuffers]; /*get models*/ CC3MeshNode* cubeNode = (CC3MeshNode*)[self getNodeNamed:@"Cube"]; CC3MeshNode* sphereNode = (CC3MeshNode*)[self getNodeNamed:@"Sphere"]; /*Those boring grey colors..*/ [cubeNode setColor:ccc3(255, 255, 0)]; [sphereNode setColor:ccc3(255, 0, 0)]; float *cVertexData = (float*)((CC3VertexArrayMesh*)cubeNode.mesh).vertexLocations.vertices; int cVertexCount = (CC3VertexArrayMesh*)cubeNode.mesh).vertexLocations.vertexCount; btTriangleMesh* cTriangleMesh = new btTriangleMesh(); // for (int i = 0; i < cVertexCount * 3; i+=3) { // printf("\n%f", cVertexData[i]); // printf("\n%f", cVertexData[i+1]); // printf("\n%f", cVertexData[i+2]); // } /*Trying to create a triangle mesh that curresponds the cube in 3D space.*/ int offset = 0; for (int i = 0; i < (cVertexCount / 3); i++){ unsigned int index1 = offset; unsigned int index2 = offset+6; unsigned int index3 = offset+12; cTriangleMesh->addTriangle( btVector3(cVertexData[index1], cVertexData[index1+1], cVertexData[index1+2] ), btVector3(cVertexData[index2], cVertexData[index2+1], cVertexData[index2+2] ), btVector3(cVertexData[index3], cVertexData[index3+1], cVertexData[index3+2] )); offset += 18; } [self releaseRedundantData]; /*Create a collision shape from triangle mesh*/ btBvhTriangleMeshShape* cTriMeshShape = new btBvhTriangleMeshShape(cTriangleMesh,true); btCollisionShape *sphereShape = new btSphereShape(1); /*Create physics objects*/ gTriMeshObject = [_physicsWorld createPhysicsObjectTrimesh:cubeNode shape:cTriMeshShape mass:0 restitution:1.0 position:cubeNode.location]; sphereObject = [_physicsWorld createPhysicsObject:sphereNode shape:sphereShape mass:1 restitution:0.1 position:sphereNode.location]; sphereObject.rigidBody->setDamping(0.1,0.8); } When I run the sphere and cube shows up fine. I expect the sphere object to fall directly on top of the cube, since I have given it a mass of 1 and the physics world gravity is given as -9.8 in y direction. But What is happening the spere rotates around cube three or times and then just jumps out of the scene. Then I know I have some basic misunderstanding about the whole process. So my question is, how can I create a physics collision shape which corresponds to the shape of a particular mesh model. I may need complex shapes than cube and sphere, but before going into them I want to understand the concepts.

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  • Collocation in Code

    - by Dan McGrath
    Quite some time ago I remember reading an article from 'Joel on Software' that mentioned collocation of information in code was important. By collocation, I mean that relevant information about the code is present when the code is. I'm currently writing an article that has a small bit in it about collocation so I went searching for sources and found the quote in the article 'Making Wrong Code Look Wrong' In order to make code really, really robust, when you code-review it, you need to have coding conventions that allow collocation. In other words, the more information about what code is doing is located right in front of your eyes, the better a job you’ll do at finding the mistakes. When you have code that says For me, collocation isn't just about the code itself, but the tool used to view the code. If it can help with the 'collocation factor' (term coined by me?) I believe it can help with the programmers productivity. Take for example the modern IDEs that show you the variables type by hovering over it. Are their any other articles written about collocation in code and/or are their other terms that this is known by?

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  • Static classes and/or singletons -- How many does it take to become a code smell?

    - by Earlz
    In my projects I use quite a lot of static classes. These are usually classes that naturally seem to fit into a single-instance type of thing. Many times I use static classes and recently I've started using some singletons. How many of these does it take to become a code smell? For instance, in my recent project which has a lot of static classes is an Authentication library for ASP.Net. I use a static class for a helper class that fixes ASP.Net error codes so it can be used like CustomErrorsFixer.Fix(Context); Or my authentication class itself is a static class //in global.asax's begin_application Authentication.SomeState="blah"; Authentication.SomeOption=true; //etc //in global.asax's begin_request Authentication.Authenticate(); When are static or singleton classes bad to use? Am I doing it wrong, or am I just in a project that by definition has very little per-instance state associated with it? The only per-instance state I have is stored in HttpContext.Current.Items like so: /// <summary> /// The current user logged in for the HTTP request. If there is not a user logged in, this will be null. /// </summary> public static UserData CurrentUser{ get{ return HttpContext.Current.Items["fscauth_currentuser"] as UserData; //use HttpContext.Current as a little place to persist static data for this request } private set{ HttpContext.Current.Items["fscauth_currentuser"]=value; } }

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  • Models, collections...and then what? Processes?

    - by Dan
    I'm a LAMP-stack dev who's been more on the JavaScript side the last few years and really enjoying the Model + Collection approach to data entities that BackboneJS, etc. uses. It's helped me organize my code in such a way that it is extremely portable, keeping all my properties and methods in the scope (model, collection, etc.) in which they apply. One thing that keeps bugging me though is how to organize the next level up, the 'process layer' as you might call it, that can potentially operate on instances of either models or collections or whatever else. Where should methods like find() (which returns a collection) and create() (which returns a model) reside? I know some people would put a create() in the Collection prototype, but while a collection operates on models I don't think it's exactly right to create them. And while a find() would return a collection I don't think it correct to have that action within the collection prototype itself (it should be a layer up). Can anyone offer some examples of any patterns that employ some kind of OOP-friendly 'process' layer? I'm sorry if this is a fairly well-known discussion but I'm afraid I can't seem to find the terminology to search for.

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  • Using separate model methods to manage transactions

    - by DCrystal
    If i’ve got 2(or more) model methods which do (for example, in billing system) enrolling/withdrawing, and one controller’s method that calls 2(or more) of these model methods. Is it a good way(maybe, any suggestions how to do it better) to write/use 2model methods like these: public function start_transaction(){ $this->db->trans_start(); } public function end_transaction(){ $this->db->trans_complete(); } And call in controller’s method: public function smth(){ //something $this->model->start_transaction(); $this->model->enroll(); //something else $this->model->withdraw(); $this->model->end_transaction(); } Will transaction be reversed, if model's withdraw() method fails? Thanks.

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  • ASP.Net MVC 2: How to keep values in the model between posts

    - by Andreas
    I have an edit view that is displaying some model properties as plain text and other model properties as input fields. My problem is that the model properties displayed as plain text are null when the model is returned to the view after a validation error. How do I retain the model values when I don't have input fields for all properties? What is best practice? My first thought is to keep the values of these properties in hidden input elements. <%= Html.HiddenFor(model => model.CustomerName) %> Is this considered a correct solution? Thanks Andreas

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  • Code Golf: Countdown Number Game

    - by Noldorin
    Challenge Here is the task, inspired by the well-known British TV game show Countdown. The challenge should be pretty clear even without any knowledge of the game, but feel free to ask for clarifications. And if you fancy seeing a clip of this game in action, check out this YouTube clip. It features the wonderful late Richard Whitely in 1997. You are given 6 numbers, chosen at random from the set {1, 2, 3, 4, 5, 6, 8, 9, 10, 25, 50, 75, 100}, and a random target number between 100 and 999. The aim is to make use the six given numbers and the four common arithmetic operations (addition, subtraction, multiplication, division; all over the rational numbers) to generate the target - or as close as possible either side. Each number may only be used once at most, while each arithmetic operator may be used any number of times (including zero.) Note that it does not matter how many numbers are used. Write a function that takes the target number and set of 6 numbers (can be represented as list/collection/array/sequence) and returns the solution in any standard numerical notation (e.g. infix, prefix, postfix). The function must always return the closest-possible result to the target, and must run in at most 1 minute on a standard PC. Note that in the case where more than one solution exists, any single solution is sufficient. Examples: {50, 100, 4, 2, 2, 4}, target 203 e.g. 100 * 2 + 2 + (4 / 4) e.g. (100 + 50) * 4 * 2 / (4 + 2) {25, 4, 9, 2, 3, 10}, target 465 e.g. (25 + 10 - 4) * (9 * 2 - 3) {9, 8, 10, 5, 9, 7), target 241 e.g. ((10 + 9) * 9 * 7) + 8) / 5 Rules Other than mentioned in the problem statement, there are no further restrictions. You may write the function in any standard language (standard I/O is not necessary). The aim as always is to solve the task with the smallest number of characters of code. Saying that, I may not simply accept the answer with the shortest code. I'll also be looking at elegance of the code and time complexity of the algorithm! My Solution I'm attempting an F# solution when I find the free time - will post it here when I have something! Format Please post all answers in the following format for the purpose of easy comparison: Language Number of characters: ??? Fully obfuscated function: (code here) Clear (ideally commented) function: (code here) Any notes on the algorithm/clever shortcuts it takes.

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  • Entity Framework 4 Hiding Underlying Resolver Tables when model is generated from database

    - by grrrrrrrrrrrrr
    When creating an entity framework model from scratch it is possible to specify a Many to Many relationship in the model. e.g Entity1 * ----- * Entity2 When a database is then generated from this, a resolver table is then created automatically between the two entities, this is hidden in the code model, allowing direct access to each of the entities via properties. e.g. Entity1 ----* ResolverEntity *----- Entity2 My question is, when a model is generated from an existing database, which contains resolver tables, is it possible to create the same effect so the resolver tables do not appear in the generated object model? When I have attempted this, the entity framework appears to create entities in the model for the resolver tables with no obvious way of hiding them in the object model. Thanks.

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  • Advice Needed: Developers blocked by waiting on code to merge from another branch using GitFlow

    - by fogwolf
    Our team just made the switch from FogBugz & Kiln/Mercurial to Jira & Stash/Git. We are using the Git Flow model for branching, adding subtask branches off of feature branches (relating to Jira subtasks of Jira features). We are using Stash to assign a reviewer when we create a pull request to merge back into the parent branch (usually develop but for subtasks back into the feature branch). The problem we're finding is that even with the best planning and breakdown of feature cases, when multiple developers are working together on the same feature, say on the front-end and back-end, if they are working on interdependent code that is in separate branches one developer ends up blocking the other. We've tried pulling between each others' branches as we develop. We've also tried creating local integration branches each developer can pull from multiple branches to test the integration as they develop. Finally, and this seems to work possibly the best for us so far, though with a bit more overhead, we have tried creating an integration branch off of the feature branch right off the bat. When a subtask branch (off of the feature branch) is ready for a pull request and code review, we also manually merge those change sets into this feature integration branch. Then all interested developers are able to pull from that integration branch into other dependent subtask branches. This prevents anyone from waiting for any branch they are dependent upon to pass code review. I know this isn't necessarily a Git issue - it has to do with working on interdependent code in multiple branches, mixed with our own work process and culture. If we didn't have the strict code-review policy for develop (true integration branch) then developer 1 could merge to develop for developer 2 to pull from. Another complication is that we are also required to do some preliminary testing as part of the code review process before handing the feature off to QA.This means that even if front-end developer 1 is pulling directly from back-end developer 2's branch as they go, if back-end developer 2 finishes and his/her pull request is sitting in code review for a week, then front-end developer 2 technically can't create his pull request/code review because his/her code reviewer can't test because back-end developer 2's code hasn't been merged into develop yet. Bottom line is we're finding ourselves in a much more serial rather than parallel approach in these instance, depending on which route we go, and would like to find a process to use to avoid this. Last thing I'll mention is we realize by sharing code across branches that haven't been code reviewed and finalized yet we are in essence using the beta code of others. To a certain extent I don't think we can avoid that and are willing to accept that to a degree. Anyway, any ideas, input, etc... greatly appreciated. Thanks!

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  • Fixing the #mvvmlight code snippets in Visual Studio 11

    - by Laurent Bugnion
    If you installed the latest MVVM Light version for Windows 8, you may encounter an issue where code snippets are not displayed correctly in the Intellisense popup. I am working on a fix, but for now here is how you can solve the issue manually. The code snippets MVVM Light, when installed correctly, will install a set of code snippets that are very useful to allow you to type less code. As I use to say, code is where bugs are, so you want to type as little of that as possible ;) With code snippets, you can easily auto-insert segments of code and easily replace the keywords where needed. For instance, every coder who uses MVVM as his favorite UI pattern for XAML based development is used to the INotifyPropertyChanged implementation, and how boring it can be to type these “observable properties”. Obviously a good fix would be something like an “Observable” attribute, but that is not supported in the language or the framework for the moment. Another fix involves “IL weaving”, which is a post-build operation modifying the generate IL code and inserting the “RaisePropertyChanged” instruction. I admire the invention of those who developed that, but it feels a bit too much like magic to me. I prefer more “down to earth” solutions, and thus I use the code snippets. Fixing the issue Normally, you should see the code snippets in Intellisense when you position your cursor in a C# file and type mvvm. All MVVM Light snippets start with these 4 letters. Normal MVVM Light code snippets However, in Windows 8 CP, there is an issue that prevents them to appear correctly, so you won’t see them in the Intellisense windows. To restore that, follow the steps: In Visual Studio 11, open the menu Tools, Code Snippets Manager. In the combobox, select Visual C#. Press Add… Navigate to C:\Program Files (x86)\Laurent Bugnion (GalaSoft)\Mvvm Light Toolkit\SnippetsWin8 and select the CSharp folder. Press Select Folder. Press OK to close the Code Snippets Manager. Now if you type mvvm in a C# file, you should see the snippets in your Intellisense window. Cheers Laurent   Laurent Bugnion (GalaSoft) Subscribe | Twitter | Facebook | Flickr | LinkedIn

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  • What source code organization approach helps improve modularity and API/Implementation separation?

    - by Berin Loritsch
    Few languages are as restrictive as Java with file naming standards and project structure. In that language, the file name must match the public class declared in the file, and the file must live in a directory structure matching the class package. I have mixed feelings about that approach. While I never have to guess where a file lives, there's still a lot of empty directories and artificial constraints. There's several languages that define everything about a class in one file, at least by convention. C#, Python (I think), Ruby, Erlang, etc. The commonality in most these languages is that they are object oriented, although that statement can probably be rebuffed (there is one non-OO language in the list already). Finally, there's quite a few languages mostly in the C family that have a separate header and implementation file. For C I think this makes sense, because it is one of the few ways to separate the API interface from implementations. With C it seems that feature is used to promote modularity. Yet, with C++ the way header and implementation files are split seems rather forced. You don't get the same clean API separation that you do with C, and you are forced to include some private details in the header you would rather keep only in the implementation. There's quite a few languages that have a concept that overlaps with interfaces like Java, C#, Go, etc. Some languages use what feels like a hack to provide the same concept like C# using pure virtual abstract classes. Still others don't really have an interface concept and rely on "duck" typing--for example Ruby. Ruby has modules, but those are more along the lines of mixing in behaviors to a class than they are for defining how to interact with a class. In OO terms, interfaces are a powerful way to provide separation between an API client and an API implementation. So to hurry up and ask the question, from a personal experience point of view: Does separation of header and implementation help you write more modular code, or does it get in the way? (it helps to specify the language you are referring to) Does the strict file name to class name scheme of Java help maintainability, or is it unnecessary structure for structure's sake? What would you propose to promote good API/Implementation separation and project maintenance, how would you prefer to do it?

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