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  • What if we run out of stack space in C# or Python?

    - by dotneteer
    Supposing we are running a recursive algorithm on a very large data set that requires, say, 1 million recursive calls. Normally, one would solve such a large problem by converting recursion to a loop and a stack, but what if we do not want to or cannot rewrite the algorithm? Python has the sys.setrecursionlimit(int) method to set the number of recursions. However, this is only part of the story; the program can still run our of stack space. C# does not have a equivalent method. Fortunately, both C# and Python have option to set the stack space when creating a thread. In C#, there is an overloaded constructor for the Thread class that accepts a parameter for the stack size: Thread t = new Thread(work, stackSize); In Python, we can set the stack size by calling: threading.stack_size(67108864) We can then run our work under a new thread with increased stack size.

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  • How can I selectively update XNA GameComponents?

    - by Bill
    I have a small 2D game I'm working on in XNA. So far, I have a player-controlled ship that operates on vector thrust and is terribly fun to spin around in circles. I've implemented this as a DrawableGameComponent and registered it with the game using game.Components.Add(this) in the Ship object constructor. How can I implement features like pausing and a menu system with my current implementation? Is it possible to set certain GameComponents to not update? Is this something for which I should even be using a DrawableGameComponent? If not, what are more appropriate uses for this?

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  • Open Source Errors on Apple Cruch

    - by BluFire
    I've been looking around and I finally got the full source code called Apple-Crunch from google code. But when I put it into my project, the source code included so many errors in the class files such as: cannot be resolved into a type the constructor is undefined the method method() is undefined for the type Sprite class.java I downloaded the source directly from the command-line and noticed errors popping up on my project. Since i couldn't figure out how to import the actual folder into my workspace(it wouldn't show up on existing projects) I decided to copy and overwrite the folders into the project. The Errors were still there so I looked at the class files and noticed that the classes with errors extended from 'RokonActivity'. I then proceeded to add to the libs folder the rokon library in hopes to fix the errors. Sadly it didn't work and now I don't what to do to fix the errors. How do i fix the errors without having to manually change the code? The source code should be fully functional so why is there errors?

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  • creating a pre-menu level select screen

    - by Ephiras
    Hi I am working on creating a tower Defence java applet game and have come to a road block about implementing a title screen that i can select the level and difficulty of the rest of the game. my title screen class is called Menu. from this menu class i need to pass in many different variables into my Main class. i have used different classes before and know how to run them and such. but if both classes extend applet and each has its individual graphics method how can i run things from Main even though it was created in Menu. what i essentially want to do is run the Menu class withits action listeners and graphics until a Difficulty button has been selected, run the main class (which 100% works without having to have the Menu class) and pretty much terminate Menu so that i cannot go back to it, do not see its buttons or graphics menus. can i run one applet annd when i choose a button close that one and launch the other one? IF you would like to download the full project you can find it here, i had to comment out all the code that wasn't working my Menu class import java.awt.*; import java.awt.event.*; import java.applet.*; public class Menu extends Applet implements ActionListener{ Button bEasy,bMed,bHard; Main m; public void init(){ bEasy= new Button("Easy"); bEasy.setBounds(140,200,100,50); add(bEasy); bMed = new Button("Medium");bMed.setBounds(280,200,100,50); add(bMed); bHard= new Button("Hard");bHard.setBounds(420,200,100,50); add(bHard); setLayout(null); } public void actionPerformed(ActionEvent e){ Main m = new Main(20,10,3000,mapMed);//break; switch (e.getSource()){ case bEasy: Main m = new Main(6000,20,"levels/levelEasy.png");break;//enimies tower money world case bMed: Main m = new Main(4000,15,"levels/levelMed.png");break; case bHard: Main m = new Main(2000,10,"levels/levelEasy.png");break; default: break; } } public void paint(){ //m.draw(g) } } and here is my main class initialising code. import java.awt.*; import java.awt.event.*; import java.applet.*; import java.io.IOException; public class Main extends Applet implements Runnable, MouseListener, MouseMotionListener, ActionListener{ Button startButton, UpgRange, UpgDamage; //set up the buttons Color roadCol,startCol,finCol,selGrass,selRoad; //set up the colors Enemy e[][]; Tower t[]; Image towerpic,backpic,roadpic,levelPic; private Image i; private Graphics doubleG; //here is the world 0=grass 1=road 2=start 3=end int world[][],eStartX,eStartY; boolean drawMouse,gameEnd; static boolean start=false; static int gridLength=15; static int round=0; int Mx,My,timer=1500; static int sqrSize=31; int towers=0,towerSelected=-10; static int castleHealth=2000; String levelPath; //choose the level Easy Med or Hard int maxEnemy[] = {5,7,12,20,30,15,50,30,40,60};//number of enimies per round int maxTowers=15;//maximum number of towers allowed static int money =2000,damPrice=600,ranPrice=350,towerPrice=700; //money = the intial ammount of money you start of with //damPrice is the price to increase the damage of a tower //ranPrice is the price to increase the range of a tower public void main(int cH,int mT,int mo,int dP,int rP,int tP,String path,int[] mE)//constructor 1 castleHealth=cH; maxTowers=mT; money=mo; damPrice=dP; ranPrice=rP; towerPrice=tP; String levelPath=path; maxEnemy = mE; buildLevel(); } public void main(int cH,int mT,String path)//basic constructor castleHealth=cH; maxTowers=mT; String levelPath=path; maxEnemy = mE; buildLevel(); } public void init(){ setSize(sqrSize*15+200,sqrSize*15);//set the size of the screen roadCol = new Color(255,216,0);//set the colors for the different objects startCol = new Color(0,38,255); finCol = new Color(255,0,0); selRoad = new Color(242,204,155);//selColor is the color of something when your mouse hovers over it selGrass = new Color(0,190,0); roadpic = getImage(getDocumentBase(),"images/road.jpg"); towerpic = getImage(getDocumentBase(),"images/tower.png"); backpic = getImage(getDocumentBase(),"images/grass.jpg"); levelPic = getImage(getDocumentBase(),"images/level.jpg"); e= new Enemy[maxEnemy.length][];//activates all of the enimies for (int r=0;r<e.length;r++) e[r] = new Enemy[maxEnemy[r]]; t= new Tower[maxTowers]; for (int i=0;i<t.length;i++) t[i]= new Tower();//activates all the towers for (int i=0;i<e.length; i++)//sets all of the enimies starting co ordinates for (int j=0;j<e[i].length;j++) e[i][j] = new Enemy(eStartX,eStartY,world); initButtons();//initialise all the buttons addMouseMotionListener(this); addMouseListener(this); }

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  • Designing an API on top with Java RMI and Rest APIs

    - by user1303881
    I'm working on the backend of a java web application. We have a document repository (Fedora Commons specifically) where we house xml files. I want to abstract the API of the repository internally so that we aren't tightly coupled to one product. I'd also like to give the flexibility of connecting to to a repository via Java RMI or REST APIs. I was hoping to get advice or resources on how to implement something like this. My thought it that I'd have some abstract repository class that had methods like getRecord, updateRecord, and deleteRecord. In the constructor I would pass the URI for the repository and the API method and port. This would allow some flexibility in the future so that if the REST api became more practical, but allow the flexibility or using RMI which could (should?) have better performance. Am I over thinking this or am I on the right path?

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  • How can I determine if a cube is adjacent to another cube, and optimize its buffers if so?

    - by Christian Frantz
    I'm trying to optimize the rendering of a collection of cubes, (based on an answer I was given to another question I asked). I understand the logic behind occlusion culling, but I'm having trouble with the code. When I create a cube, I want to determine if that cube is touching another existing cube, and if so I don't want to generate the redundant data in my vertex or index buffers. I'm planning on making a method that I call from my cube constructor so that everytime I create a cube, these checks are made, and neither occluded face is ever drawn. How would I go about this?

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  • Is having a class have a handleAction(type) method bad practice?

    - by zhenka
    My web application became a little too complicated to do everything in a controller so I had to build large wrapper classes for ORM models. The possible actions a user can trigger are all similar and after a certain point I realized that the best way to go would be to just have constructor method receive action type as a parameter to take care of the small differences internally, as opposed to either passing many arguments or doing a lot of things in the controller. Is this a good practice? I can't really give details for privacy issues.

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  • How do I fix these compiler errors in Apple Crunch?

    - by BluFire
    I've been looking around and I finally got the full source code for a game called Apple-Crunch from Google Code. But when I put it into my project, the source code included so many errors in the class files such as: cannot be resolved into a type the constructor is undefined the method method() is undefined for the type Sprite class.java I downloaded the source directly from the command-line and noticed errors popping up on my project. Since I couldn't figure out how to import the actual folder into my workspace (it wouldn't show up on existing projects) I decided to copy and overwrite the folders into the project. The errors were still there so I looked at the class files and noticed that the classes with errors extended from RokonActivity. I then proceeded to add to the libs folder the Rokon library in hopes to fix the errors. Sadly it didn't work and now I don't what to do to fix the errors. How do I fix the errors without having to manually change the code? The source code should be fully functional so why are there errors?

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  • Why use sealed instead of static on a class?

    - by sq33G
    Our system has several utility classes. Some people on our team use (A) a class with all-static methods and a private constructor. Others use (B) a class with all-static methods (these the juniors). On code analysis, (A) and (B) raise warning CA1052, which recommends marking the class as sealed. Included in the MSDN documentation there is the following advice: If you are targeting .NET Framework 2.0 or earlier, a better approach is to mark the type as static. Why does this make any sense? I would have thought the opposite; AFAIK, previous to 2.0 there was no way to mark a class as static.

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  • creating object parameters in {}?

    - by RealityDysfunction
    I am trying to decode a piece of code from a book: List<Person> people = new List<Person>() { new Person {FirstName="Homer",LastName="Simpson",Age=47}, new Person {FirstName="Marge",LastName="Simpson",Age=45} }; Person is just a simple class they made, with a bunch of fields: Name, Last Name, etc... What I don't understand is, don't we send parameters to a constructor of Person in non-curly brackets? I tried replicating this code, but it doesn't seem to fly, any takers? Thanks for input.

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  • How do I ensure that a JPanel Shrinks when the parent frame is resized?

    - by dah
    I have a basic notes panel that I'm looking to shrink the width of when the parent jframe is resized but it isn't happening. I'm using nested gridbaglayouts. package com.protocase.notes.views; import com.protocase.notes.controller.NotesController; import com.protocase.notes.model.Subject; import com.protocase.notes.model.Note; import com.protocase.notes.model.database.PMSNotesAdapter; import java.awt.Color; import java.awt.GridBagConstraints; import java.awt.GridBagLayout; import javax.swing.BorderFactory; import javax.swing.JButton; import javax.swing.JLabel; import javax.swing.JPanel; import javax.swing.JScrollPane; /** * @author DavidH */ public class NotesViewer extends JPanel { // <editor-fold defaultstate="collapsed" desc="Attributes"> private Subject subject; private NotesController controller; //</editor-fold> // <editor-fold defaultstate="collapsed" desc="Getters N' Setters"> /** * Gets back the current subject. * @return */ public Subject getSubject() { return subject; } public NotesController getController() { return controller; } public void setController(NotesController controller) { this.controller = controller; } /** * Should clear the panel of the current subject and load the details for * the other object. * @param subject */ public void setSubject(Subject subject) { this.subject = subject; } //</editor-fold> // <editor-fold defaultstate="collapsed" desc="Constructor"> /** * -- Sets up a note viewer with a subject and a controller. Likely this * would be the constructor used if you were passing off from another * NoteViewer or something else that used a notes adapter or controller. * @param subject * @param controller */ public NotesViewer(Subject subject, NotesController controller) { this.subject = subject; this.controller = controller; initComponents(); } /** * -- Sets up a note view with a subject and creates a new controller. This * would be the constructor typically chosen if choosing notes was * infrequent and only one or two notes needs to be displayed. * @param subject */ public NotesViewer(Subject subject) { this(subject, new NotesController(new PMSNotesAdapter())); } /** * -- Sets up a note view without a subject and creates a new controller. * This would be for a note viewer without any notes, perhaps populating * as you choose values in another form. * @param subject */ public NotesViewer() { this(null); } //</editor-fold> // <editor-fold defaultstate="collapsed" desc="initComponents()"> /** * Sets up the view for the NotesViewer */ private void initComponents() { // -- Make a new panel for the header JPanel panel = new JPanel(); panel.setLayout(new GridBagLayout()); GridBagConstraints c = new GridBagConstraints(); c.gridx = 0; c.fill = GridBagConstraints.HORIZONTAL; c.gridy = 0; c.weightx = .5; //c.anchor = GridBagConstraints.NORTHWEST; JLabel label = new JLabel("Viewing Notes for [Subject]"); label.setAlignmentX(JLabel.LEFT_ALIGNMENT); label.setBorder(BorderFactory.createLineBorder(Color.YELLOW)); panel.add(label); JButton newNoteButton = new JButton("New"); c = new GridBagConstraints(); // c.fill = GridBagConstraints.HORIZONTAL; c.gridx = 1; c.gridy = 0; c.weightx = .5; c.anchor = GridBagConstraints.EAST; panel.add(newNoteButton, c); // -- NotePanels c = new GridBagConstraints(); c.fill = GridBagConstraints.HORIZONTAL; c.weightx = 1; c.weighty = 1; c.gridx = 0; c.gridwidth = 2; int y = 1; for (Note n : subject.getNotes()) { c.gridy = y++; panel.add(new NotesPanel(n, controller), c); } this.setLayout(new GridBagLayout()); GridBagConstraints pc = new GridBagConstraints(); pc.gridx = 0; pc.gridy = 0; pc.weightx = 1; pc.weighty = 1; pc.fill = GridBagConstraints.BOTH; panel.setBackground(Color.blue); JScrollPane scroll = new JScrollPane(); scroll.setViewportView(panel); //scroll.setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_NEVER); this.add(scroll, pc); //this.add(panel, pc); // -- Add it all to the layout } //</editor-fold> // <editor-fold defaultstate="collapsed" desc="private methods"> //</editor-fold> } package com.protocase.notes.views; import com.protocase.notes.controller.NotesController; import com.protocase.notes.model.Note; import java.awt.CardLayout; import java.awt.Color; import java.awt.Component; import java.awt.Dimension; import java.awt.GridBagConstraints; import java.awt.GridBagLayout; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.text.DateFormat; import java.text.SimpleDateFormat; import javax.swing.BorderFactory; import javax.swing.JButton; import javax.swing.JLabel; import javax.swing.JPanel; import javax.swing.JScrollPane; import javax.swing.JTextArea; import javax.swing.JTextField; import javax.swing.border.BevelBorder; import javax.swing.border.Border; import javax.swing.border.MatteBorder; /** * @author dah01 */ public class NotesPanel extends JPanel { // <editor-fold defaultstate="collapsed" desc="Attributes"> private Note note; private NotesController controller; private CardLayout cardLayout; private JTextArea viewTextArea; private JTextArea editTextArea; //</editor-fold> // <editor-fold defaultstate="collapsed" desc="Getters N' Setters"> public NotesController getController() { return controller; } public void setController(NotesController controller) { this.controller = controller; } public Note getNote() { return note; } public void setNote(Note note) { this.note = note; } //</editor-fold> // <editor-fold defaultstate="collapsed" desc="Constructor"> /** * Sets up a note panel that shows everything about the note. * @param note */ public NotesPanel(Note note, NotesController controller) { this.note = note; cardLayout = new CardLayout(); this.setLayout(cardLayout); // -- Setup the layout manager. this.setBackground(new Color(199, 187, 192)); this.setBorder(new BevelBorder(BevelBorder.RAISED)); // -- ViewPanel this.add("ViewPanel", initViewPanel()); this.add("EditPanel", initEditPanel()); } //</editor-fold> // <editor-fold defaultstate="collapsed" desc="EditPanel"> private JPanel initEditPanel() { JPanel editPanel = new JPanel(); editPanel.setLayout(new GridBagLayout()); GridBagConstraints c = new GridBagConstraints(); c.fill = GridBagConstraints.HORIZONTAL; c.gridy = 0; c.weightx = 1; c.weighty = 0.3; editPanel.add(initCreatorLabel(), c); c.gridy++; editPanel.add(initEditTextScroll(), c); c.gridy++; c.anchor = GridBagConstraints.WEST; c.fill = GridBagConstraints.NONE; editPanel.add(initEditorLabel(), c); c.gridx++; c.anchor = GridBagConstraints.EAST; editPanel.add(initSaveButton(), c); return editPanel; } private JScrollPane initEditTextScroll() { this.editTextArea = new JTextArea(note.getContents()); editTextArea.setLineWrap(true); editTextArea.setWrapStyleWord(true); JScrollPane scrollPane = new JScrollPane(editTextArea); scrollPane.setAlignmentX(JScrollPane.LEFT_ALIGNMENT); Border b = scrollPane.getViewportBorder(); MatteBorder mb = BorderFactory.createMatteBorder(2, 2, 2, 2, Color.BLUE); scrollPane.setBorder(mb); return scrollPane; } private JButton initSaveButton() { final CardLayout l = this.cardLayout; final JPanel p = this; final NotesController c = this.controller; final Note n = this.note; final JTextArea noteText = this.viewTextArea; final JTextArea textToSubmit = this.editTextArea; ActionListener al = new ActionListener() { @Override public void actionPerformed(ActionEvent e) { //controller.saveNote(n); noteText.setText(textToSubmit.getText()); l.next(p); } }; JButton saveButton = new JButton("Save"); saveButton.addActionListener(al); saveButton.setPreferredSize(new Dimension(62, 26)); return saveButton; } //</editor-fold> // <editor-fold defaultstate="collapsed" desc="ViewPanel"> private JPanel initViewPanel() { JPanel viewPanel = new JPanel(); viewPanel.setLayout(new GridBagLayout()); GridBagConstraints c = new GridBagConstraints(); c.fill = GridBagConstraints.HORIZONTAL ; c.gridy = 0; c.weightx = 1; c.weighty = 0.3; viewPanel.add(initCreatorLabel(), c); c.gridy++; viewPanel.add(this.initNoteTextArea(), c); c.fill = GridBagConstraints.NONE; c.anchor = GridBagConstraints.WEST; c.gridy++; viewPanel.add(initEditorLabel(), c); c.gridx++; c.anchor = GridBagConstraints.EAST; viewPanel.add(initEditButton(), c); return viewPanel; } private JLabel initCreatorLabel() { DateFormat formatter = new SimpleDateFormat("yyyy-MM-dd"); if (note != null) { String noteBy = "Note by " + note.getCreator(); String noteCreated = formatter.format(note.getDateCreated()); JLabel creatorLabel = new JLabel(noteBy + " @ " + noteCreated); creatorLabel.setAlignmentX(JLabel.LEFT_ALIGNMENT); return creatorLabel; } else { System.out.println("NOTE IS NULL"); return null; } } private JScrollPane initNoteTextArea() { // -- Setup the notes area. this.viewTextArea = new JTextArea(note.getContents()); viewTextArea.setEditable(false); viewTextArea.setLineWrap(true); viewTextArea.setWrapStyleWord(true); JScrollPane scrollPane = new JScrollPane(viewTextArea); scrollPane.setAlignmentX(JScrollPane.LEFT_ALIGNMENT); return scrollPane; } private JLabel initEditorLabel() { // -- Setup the edited by label. JLabel editorLabel = new JLabel(" -- Last edited by " + note.getLastEdited() + " at " + note.getDateModified()); editorLabel.setAlignmentX(Component.LEFT_ALIGNMENT); return editorLabel; } private JButton initEditButton() { final CardLayout l = this.cardLayout; final JPanel p = this; ActionListener ar = new ActionListener() { @Override public void actionPerformed(ActionEvent e) { l.next(p); } }; JButton editButton = new JButton("Edit"); editButton.setPreferredSize(new Dimension(62,26)); editButton.addActionListener(ar); return editButton; } //</editor-fold> // <editor-fold defaultstate="collapsed" desc="Grow Width When Resized"> @Override public Dimension getPreferredSize() { int fw = this.getParent().getSize().width; int fh = super.getPreferredSize().height; return new Dimension(fw,fh); } //</editor-fold> }

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  • Constraints while designing the Java generics

    - by Andrea
    Java generics look quite different from those available in Scala, although both were designed by Martin Odersky. From my point of view, the design of generics in Java is worse, for instance: there is no possibility to specify variance one can get around the previous limitation by using wildcards, but this means the burden of specifying variance goes on the caller instead of the library designer one cannot use a type constructor in generics What were the constraints in Java that forced Odersky to design this mechanism for generics instead of the more flexible one he devised for Scala? Was he just savvier a few years later or there were actual limitations due to Java?

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  • XNA - Am I screwing up the LoadContent for Texture2D?

    - by Bombcode
    I've read forum threads and questions and I done just about everything. I need to know what am I screwing up here. Here's the code in the constructor. Content.RootDirectory = "GameStateContent"; //Content.RootDirectory = "Content"; And this is in the LoadContent method menu = this.Content.Load<Texture2D>("mainmenu"); And here's the image screen shot of the folder structure. http://i.imgur.com/HnndE.png Any helps on this? Thanks.

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  • DDD and validation of aggregate root

    - by Mik378
    Suppose an aggregate root : MailConfiguration (wrapping an AddressPart object). The AddressPart object is a simple immutable value object with some fields like senderAdress, recipentAddress (to make example simple). As being an invariant object, AddressPart should logically wrap its own Validator (by the way of external a kind of AddressValidator for respecting Single Responsibility Principle) I read some articles that claimed an aggregateRoot must validate its 'children'. However, if we follow this principle, one could create an AddressPart with an uncohesive/invalid state. What are your opinion? Should I move the collaborator AddressValidator(used in constructor so in order to validate immediately the cohesion of an AddressPart) from AddressPart and assign it to aggregateRoot (MailConfiguration) ?

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  • Castle Windsor Dependency Injection with MVC4

    - by Renso
    Problem:Installed MVC4 on my local and ran a MVC3 app and got an error where Castle Windsor was unable to resolve any controllers' constructor injections. It failed with "No component for supporting the service....".As soon as I uninstall MVC4 beta, the problem vanishes like magic?!I also tried to upgrade to NHibernate 3 and Castle and Castle Windsor to version 3 (from version 2), but since I use Rhino Commons, that is not possible as the Rhino Commons project looks like is no longer supported and requests to upgrade it to work with NHibernate version 3 two years ago has gone unanswered. The problem is that Rhino Commons (the older version) references a method in Castle version 2 that has been depreciated in version 3: "CreateContainer("windsor.boo")' threw an exception of type 'System.MissingMethodException."Hope this helps anyone else who runs into this issue. Btw I used NuGet package manager to install the correct packages so I know that is not the issue.

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  • Of which bad practice is require calling functions in order a sign?

    - by stijn
    Sometimes I find myself writing comments on class methods like this: class A : public Base { public: /** * Sets variable; * should be called before ImplementsInterfaceMtehod(), * else has no effect. */ void SetSomeVariable( var_type value ); virtual void ImplementsInterfaceMethod(); } The callers of Base::ImplementsInterfaceMethod obviously do not know about the variable, and should not. But the users of A should set the variable if they want it to take effect. It is not required to set the variable (else it could be a parameter for the constructor), so I cannot throw exceptions in ImplementsInterfaceMethod if it is not set. Is this a sign of some typical bad practice? Is there a better way than writing a comment as shown to deal with this?

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  • Is it bad practice to use the same name for arguments and members?

    - by stijn
    Sometimes I write constructor code like class X { public: X( const int numberOfThingsToDo ) : numberOfThingsToDo( numberOfThingsToDo ) { } private: int numberOfThingsToDo; }; or in C# class X { public X( int numberOfThingsToDo ) { this.numberOfThingsToDo = numberOfThingsToDo; } private int numberOfThingsToDo; } I think the main reason is that when I come up with a suitable member name, I see no reason to use a different one for the argument initializing it, and since I'm also no fan of using underscores the easiest is just to pick the same name. After all it's suitable. Is this considered bad practice however? Any drawbacks (apart from shooting yourself in the foot when forgetting the this in C#)?

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  • Handling array passed to object at creation

    - by cecilli0n
    When creating my object I pass it an array of a row from my database. (everything in the array we will need, disregarding unnecessary elements at sql query level) When I need to access certain array elements from within my class, I do so like $this->row['element'] However, As I continue development, I sometimes forget what exactly is in this passed array.(this itself doesn't seem good) I am wondering if their is a professional approach to dealing with this, Or am I the only one who has these "I wonder whats in the array" thoughts. One approach to tackling this could be that when we originally pass the array, in the constructor, we assign each element of the array to its own variable, but is this considered professional practice? Additionally by doing this, we could make those variables constants, in a attempt at immutability. Overall I am trying to adhere to good software craftsmanship. Regards.

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  • In C++, is it a reflection of poor software design if objects are deleted manually?

    - by grokus
    With the advent of smart pointers, is it a sign of poor design if I see objects are deleted? I'm seeing some software components in our product that people are still doing this. This practice strikes me as un-idiomatic, but I need to be sure this is the industry consensus. I'm not starting a crusade but it'd be nice to be prepared theory wise. Edit: legit uses of delete, Klaim mentioned the object pool use case. I agree. Bad examples of using delete, I am seeing many new's in constructor or start() and corresponding delete's in the destructor or stop(), why not use scoped_ptr? It makes the code cleaner.

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  • How can I access bitmaps created in another activity?

    - by user22241
    I am currently loading my game bitmaps when the user presses 'start' in my animated splash screen activity (the first / launch activity) and the app progresses from my this activity to the main game activity, This is causing choppy animation in the splashscreen while it loads/creates the bitmaps for the new activity. I've been told that I should load all my bitmaps in one go at the very beginning. However, I can't work out how to do this - could anyone please point me in the right direction? I have 2 activities, a splash screen and the main game. Each consist of a class that extends activity and a class that extends SurfaceView (with an inner class for the rendering / logic updating). So, for example at the moment I am creating my bitmaps in the constructor of my SurfaceView class like so: public class OptionsScreen extends SurfaceView implements SurfaceHolder.Callback { //Create variables here public OptionsScreen(Context context) { Create bitmaps here } public void intialise(){ //This method is called from onCreate() of corresponding application context // Create scaled bitmaps here (from bitmaps previously created) }

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  • How should I write new code when the old codebase and the environment uses lots of globals in PHP

    - by Nicola Peluchetti
    I'm working in the Wordpress environment which itself heavily relies on globals and the codebase I'm maintaining introduces some more. I want this to change and so I'm trying to think how should I handle this. For the globals our code has introduced I think I will set them as dependencies in the constructor or in getter / setter so that I don't rely on them being globals and then refactor the old codebase little by little so that we have no globals. With Wordpress globals I was thinking to wrap all WP globals inside a Wrapper class and hide them in there. Like this class WpGlobals { public static function getDb() { global $wpdb; return $wpdb; } } Would this be of any help? The idea is that I centralize all globals in one class and do not scatter them through the code, so that if Wordpress kills one of them I need to modify code only in one place. What would you do?

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  • Navigation in a #WP7 application with MVVM Light

    - by Laurent Bugnion
    In MVVM applications, it can be a bit of a challenge to send instructions to the view (for example a page) from a viewmodel. Thankfully, we have good tools at our disposal to help with that. In his excellent series “MVVM Light Toolkit soup to nuts”, Jesse Liberty proposes one approach using the MVVM Light messaging infrastructure. While this works fine, I would like to show here another approach using what I call a “view service”, i.e. an abstracted service that is invoked from the viewmodel, and implemented on the view. Multiple kinds of view services In fact, I use view services quite often, and even started standardizing them for the Windows Phone 7 applications I work on. If there is interest, I will be happy to show other such view services, for example Animation services, responsible to start/stop animations on the view. Dialog service, in charge of displaying messages to the user and gathering feedback. Navigation service, in charge of navigating to a given page directly from the viewmodel. In this article, I will concentrate on the navigation service. The INavigationService interface In most WP7 apps, the navigation service is used in quite a straightforward way. We want to: Navigate to a given URI. Go back. Be notified when a navigation is taking place, and be able to cancel. The INavigationService interface is quite simple indeed: public interface INavigationService { event NavigatingCancelEventHandler Navigating; void NavigateTo(Uri pageUri); void GoBack(); } Obviously, this interface can be extended if necessary, but in most of the apps I worked on, I found that this covers my needs. The NavigationService class It is possible to nicely pack the navigation service into its own class. To do this, we need to remember that all the PhoneApplicationPage instances use the same instance of the navigation service, exposed through their NavigationService property. In fact, in a WP7 application, it is the main frame (RootFrame, of type PhoneApplicationFrame) that is responsible for this task. So, our implementation of the NavigationService class can leverage this. First the class will grab the PhoneApplicationFrame and store a reference to it. Also, it registers a handler for the Navigating event, and forwards the event to the listening viewmodels (if any). Then, the NavigateTo and the GoBack methods are implemented. They are quite simple, because they are in fact just a gateway to the PhoneApplicationFrame. The whole class is as follows: public class NavigationService : INavigationService { private PhoneApplicationFrame _mainFrame; public event NavigatingCancelEventHandler Navigating; public void NavigateTo(Uri pageUri) { if (EnsureMainFrame()) { _mainFrame.Navigate(pageUri); } } public void GoBack() { if (EnsureMainFrame() && _mainFrame.CanGoBack) { _mainFrame.GoBack(); } } private bool EnsureMainFrame() { if (_mainFrame != null) { return true; } _mainFrame = Application.Current.RootVisual as PhoneApplicationFrame; if (_mainFrame != null) { // Could be null if the app runs inside a design tool _mainFrame.Navigating += (s, e) => { if (Navigating != null) { Navigating(s, e); } }; return true; } return false; } } Exposing URIs I find that it is a good practice to expose each page’s URI as a constant. In MVVM Light applications, a good place to do that is the ViewModelLocator, which already acts like a central point of setup for the views and their viewmodels. Note that in some cases, it is necessary to expose the URL as a string, for instance when a query string needs to be passed to the view. So for example we could have: public static readonly Uri MainPageUri = new Uri("/MainPage.xaml", UriKind.Relative); public const string AnotherPageUrl = "/AnotherPage.xaml?param1={0}&param2={1}"; Creating and using the NavigationService Normally, we only need one instance of the NavigationService class. In cases where you use an IOC container, it is easy to simply register a singleton instance. For example, I am using a modified version of a super simple IOC container, and so I can register the navigation service as follows: SimpleIoc.Register<INavigationService, NavigationService>(); Then, it can be resolved where needed with: SimpleIoc.Resolve<INavigationService>(); Or (more frequently), I simply declare a parameter on the viewmodel constructor of type INavigationService and let the IOC container do its magic and inject the instance of the NavigationService when the viewmodel is created. On supported platforms (for example Silverlight 4), it is also possible to use MEF. Or, of course, we can simply instantiate the NavigationService in the ViewModelLocator, and pass this instance as a parameter of the viewmodels’ constructor, injected as a property, etc… Once the instance has been passed to the viewmodel, it can be used, for example with: NavigationService.NavigateTo(ViewModelLocator.ComparisonPageUri); Testing Thanks to the INavigationService interface, navigation can be mocked and tested when the viewmodel is put under unit test. Simply implement and inject a mock class, and assert that the methods are called as they should by the viewmodel. Conclusion As usual, there are multiple ways to code a solution answering your needs. I find that view services are a really neat way to delegate view-specific responsibilities such as animation, dialogs and of course navigation to other classes through an abstracted interface. In some cases, such as the NavigationService class exposed here, it is even possible to standardize the implementation and pack it in a class library for reuse. I hope that this sample is useful! Happy coding. Laurent   Laurent Bugnion (GalaSoft) Subscribe | Twitter | Facebook | Flickr | LinkedIn

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  • Texture not drawing on cubes

    - by Christian Frantz
    I can draw the cubes fine but they are just solid black besides the occasional lighting that goes on. The basic effect is being set for each cube also. public void Draw(BasicEffect effect) { foreach (EffectPass pass in effect.CurrentTechnique.Passes) { pass.Apply(); device.SetVertexBuffer(vertexBuffer); device.Indices = indexBuffer; device.DrawIndexedPrimitives(PrimitiveType.TriangleList, 0, 0, 8, 0, 12); } } The cubes draw method. TextureEnabled is set to true in my main draw method. My texture is also loading fine. public Cube(GraphicsDevice graphicsDevice, Vector3 Position, Texture2D Texture) { device = graphicsDevice; texture = Texture; cubePosition = Position; effect = new BasicEffect(device); } The constructor seems fine too. Could this be caused by the Vector2's of my VertexPositionNormalTexture? Even if they were out of order something should still be drawn other than a black cube

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  • Should I use the factory design pattern for every class?

    - by Frog
    I've been writing a website in PHP. As the code becomes more complex, I keep finding problems that can be solved using the factory design pattern. For example: I've a got a class Page which has subclasses HTMLPage, XMLPage, etc. Depending on some input I need to return an object of either one of these classes. I use the factory design pattern to do this. But as I encounter this problem in more classes, I keep having to change code which still initiates an object using its constructor. So now I'm wondering: is it a good idea to change all code so that it uses the factory design pattern? Or are there big drawbacks? I'm currently in a position to change this, so your answers would be really helpful.

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  • Loading assets in Monogame

    - by Matebu
    I'm creating a MonoGame application on Visual Studio 2012, yet when trying to load a texture I get the following problem: Could not load Menu/btnPlay asset! I have set content directory: Content.RootDirectory = "Assets"; Also the file btnPlay.png has properties set: Build Action: Content and Copy to Output directory: Copy if newer. My constructor and LoadContent functions are totally empty, but have a look yourself: public WizardGame() { Window.Title = "Just another Wizard game"; _graphics = new GraphicsDeviceManager(this); Content.RootDirectory = "Assets"; } protected override void LoadContent() { // Create a new SpriteBatch, which can be used to draw textures. _spriteBatch = new SpriteBatch(GraphicsDevice); Texture2D texture = Content.Load<Texture2D>("Menu/btnPlay"); _graphics.IsFullScreen = true; _graphics.ApplyChanges(); } How do I properly load a texture?

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