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  • Implementing a "state-machine" logic for methods required by an object in C++

    - by user827992
    What I have: 1 hypothetical object/class + other classes and related methods that gives me functionality. What I want: linking this object to 0 to N methods in realtime on request when an event is triggered Each event is related to a single method or a class, so a single event does not necessarily mean "connect this 1 method only" but can also mean "connect all the methods from that class or a group of methods" Avoiding linked lists because I have to browse the entire list to know what methods are linked, because this does not ensure me that the linked methods are kept in a particular order (let's say an alphabetic order by their names or classes), and also because this involve a massive amount of pointers usage. Example: I have an object Employee Jon, Jon acquires knowledge and forgets things pretty easily, so his skills may vary during a period of time, I'm responsible for what Jon can add or remove from his CV, how can I implement this logic?

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  • Mobile 3D engine renders alpha as full-object transparency

    - by Nils Munch
    I am running a iOS project using the isgl3d framework for showing pod files. I have a stylish car with 0.5 alpha windows, that I wish to render on a camera background, seeking some augmented reality goodness. The alpha on the windows looks okay, but when I add the object, I notice that it renders the entire object transparently, where the windows are. Including interior of the car. Like so (in example, keyboard can be seen through the dashboard, seats and so on. should be solid) The car interior is a seperate object with alpha 1.0. I would rather not show a "ghost car" in my project, but I haven't found a way around this. Have anyone encountered the same issue, and eventually reached a solution ?

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  • Yet Yet Another Way To Create An Object

    - by Ricardo Peres
    Yep, there's still another one: FormatterServices. This one allows one to create an object without running it's constructor... it is used by some of our good friends serializers. Stopwatch watch = new Stopwatch(); for (Int32 i = 0; i Beware, though: because the constructor isn't run (and remember that all fields that are initialized inline are also in fact initialized in the constructor), the object's state may be invalid. Enough object construction for now... SyntaxHighlighter.config.clipboardSwf = 'http://alexgorbatchev.com/pub/sh/2.0.320/scripts/clipboard.swf'; SyntaxHighlighter.brushes.CSharp.aliases = ['c#', 'c-sharp', 'csharp']; SyntaxHighlighter.all();

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  • 2D object-aligned bounding-box intersection test

    - by AshleysBrain
    Hi all, I have two object-aligned bounding boxes (i.e. not axis aligned, they rotate with the object). I'd like to know if two object-aligned boxes overlap. (Edit: note - I'm using an axis-aligned bounding box test to quickly discard distant objects, so it doesn't matter if the quad routine is a little slower.) My boxes are stored as four x,y points. I've searched around for answers, but I can't make sense of the variable names and algorithms in examples to apply them to my particular case. Can someone help show me how this would be done, in a clear and simple way? Thanks. (The particular language isn't important, C-style pseudo code is OK.)

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  • Figuring a max repetitive sub-tree in an object tree

    - by bonomo
    I am trying to solve a problem of finding a max repetitive sub-tree in an object tree. By the object tree I mean a tree where each leaf and node has a name. Each leaf has a type and a value of that type associated with that leaf. Each node has a set of leaves / nodes in certain order. Given an object tree that - we know - has a repetitive sub-tree in it. By repetitive I mean 2 or more sub-trees that are similar in everything (names/types/order of sub-elements) but the values of leaves. No nodes/leaves can be shared between sub-trees. Problem is to identify these sub-trees of the max height. I know that the exhaustive search can do the trick. I am rather looking for more efficient approach.

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  • Resolving an App-Relative URL without a Page Object Reference

    - by Damon
    If you've worked with ASP.NET before then you've almost certainly seen an application-relative URL like ~/SomeFolder/SomePage.aspx.  The tilde at the beginning is a stand in for the application path, and it can easily be resolved using the Page object's ResolveUrl method: string url = Page.ResolveUrl("~/SomeFolder/SomePage.aspx"); There are times, however, when you don't have a page object available and you need to resolve an application relative URL.  Assuming you have an HttpContext object available, the following method will accomplish just that: public static string ResolveAppRelativeUrl(string url) {      return url.Replace("~", System.Web.HttpContext.Current.Request.ApplicationPath); } It just replaces the tilde with the application path, which is essentially all the ResolveUrl method does.

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  • Class as first-class object

    - by mrpyo
    Could a class be a first-class object? If yes, how would the implementation look? I mean, how could syntax for dynamically creating new classes look like? EDIT: I mean what example syntax could look like (I'm sorry, English is not my native language), but still I believe this question makes sense - how you give this functionality while keeping language consistent. For example how you create reference for new type. Do you make reference first-class object too and then use something like this: Reference<newType> r = new Reference<newType>(); r.set(value); Well this could get messy so you may just force user to use Object type references for dynamically created classes, but then you loose type-checking. I think creating concise syntax for this is interesting problem which solving could lead to better language design, maybe language which is metalanguage for itself (I wonder if this is possible).

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  • Finding closest object to a location within a specific perpendicular distance to direction vector

    - by Sniper
    I have a location and a direction vector indicating facing, I want to find the closest object to that location that is within some tolerance distance (perpendicular distance) to the ray formed by the location and direction vector. Basically I want to get the object that is being aimed at. I have thought about finding all objects within a box and then finding the closest object to my vector from them results, but I am sure that there is a more efficient way. The Z axis is optional, the objects are most likely within a few meters of the search vector.

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  • Where is the object browser in VS 2010

    - by Keltari
    I am teaching myself C# and Im using a book that references Visual Studio 2008. However, I am using VS 2010. The book wants me to look at the object browser by choosing View, Other Windows, Object Browser from the menu. However, the object browser is not there. I moused over the icons on the menu and nothing stood out. So, where is it? Also, am I going to run into more problems like this? Is it worth getting an updated book?

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  • Use unnamed object to invoke method or not?

    - by Chen OT
    If I have a class with only only public method. When I use this class, is it good to use unnamed object to invoke its method? normal: TaxFileParser tax_parser(tax_file_name); auto content = tax_parser.get_content(); or unnamed object version: auto content = TaxFileParser(tax_file_name).get_content(); Because I've told that we should avoid temporary as possible. If tax_parser object is used only once, can I call it a temporary and try to eliminate it? Any suggestion will be helpful.

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  • Replaceable parameter syntax meaning

    - by Alexander N.
    Replaceable parameter syntax for the console object in C#. I am taking the O'Reilly C# Course 1 and it is asking for a replaceable parameter syntax and it is not very clear on what that means. Currently I used this: double trouble = 99999.0009; double bubble = 11111.0001; Console.WriteLine(trouble * bubble); Am I missing the meaning of replaceable parameter syntax? Can someone provide an example for what I am looking for? Original question for the quiz: "Create two variables, both doubles, assign them numbers greater than 10,000, and include a decimal component. Output the result of multiplying the numbers together, but use replaceable parameter syntax of the Console object, and multiply the numbers within the call to the Console.WriteLine() method."

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  • Unity: Render 2D textures on a 3D object's face

    - by www.Sillitoy.com
    I am not familiar with 3D graphics and I'd like to know what is the right way to render some 2D figures on different points of a wider face of a 3D object. My 3D object is just a cube representing a poker table. I have 2D png for players placeholders and I'd like to render these figures on the 3D object where needed. An alternative solution would be to render the whole face with a big picture containing all the placeholders figures. However it would be a waste of memory and thus less efficient. What do you suggest me?

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  • Repelling a rigidbody in the direction an object is rotating

    - by ndg
    Working in Unity, I have a game object which I rotate each frame, like so: void Update() { transform.Rotate(new Vector3(0, 1, 0) * speed * Time.deltaTime); } However, I'm running into problems when it comes to applying a force to rigidbodies that collide with this game objects sphere collider. The effect I'm hoping to achieve is that objects which touch the collider are thrown in roughly the same direction as the object is rotating. To do this, I've tried the following: Vector3 force = ((transform.localRotation * Vector3.forward) * 2000) * Time.deltaTime; collision.gameObject.rigidbody.AddForce(force, ForceMode.Impulse); Unfortunately this doesn't always match the rotation of the object. To debug the issue, I wrote a simple OnDrawGizmos script, which (strangely) appears to draw the line correctly oriented to the rotation. void OnDrawGizmos() { Vector3 pos = transform.position + ((transform.localRotation * Vector3.forward) * 2); Debug.DrawLine(transform.position, pos, Color.red); } You can see the result of the OnDrawGizmos function below: What am I doing wrong?

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  • Camera placement sphere for an always fully visible object

    - by BengtR
    Given an object: With the bounds [x, y, z, width, height, depth] And an orthographic projection [left, right, bottom, top, near, far] I want to determine the radius of a sphere which allows me to randomly place my camera on so that: The object is fully visible from all positions on this sphere The sphere radius is the smallest possible value while still satisfying 1. Assume the object is centered around the origin. How can I find this radius? I'm currently using sqrt(width^2 + height^2 + depth^2) but I'm not sure that's the correct value, as it doesn't take the camera into account. Thanks for any advice. I'm sorry for confusing a few things here. My comments below should clarify what I'm trying to do actually.

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  • Render 2D textures on a 3D object's face

    - by www.Sillitoy.com
    I am not familiar with 3D graphics, and I'd like to know the right way to render some 2D figures on different points of a wider face of a 3D object. My 3D object is just a cube representing a poker table. I have a 2D png for players' placeholders, and I'd like to render these figures on the 3D object where needed. An alternative solution would be to render the whole face with a big picture containing all the placeholders figures. However, it would be a waste of memory and thus less efficient. What do you suggest?

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  • In some games, we just let the main() loop be the Player object or Table object?

    - by ????
    I was thinking that let's say if there is a game of Blackjack or MasterMind, then we should have a class called Dealer or ComputerPal, which is how the computer interact with us (as a dealer for Blackjack or as the person giving hints for MasterMind). And then there should be a Player object, and the way to play one game is aPlayer.playGame but I noticed that a book was just using the main() loop to act as the player (or as the Controller of the game), calling the Dealer methods to dealer the cards, ask for player's action, etc... 1) Is this just a lazy way to model all the proper objects? 2) If more objects are to be added, who should call the aDealer.dealCards and then ask for aPlayer.askForAction? (because it is strange to let the Player handle all the logical steps). Should there be a Table object that handle all these logic and then to play one round of game, use aTable.playGame? What is a good object design for such game?

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  • Object Oriented database development jobs

    - by GigaPr
    Hi, i am a software engineering student currently looking for a job as developer. I have been offered a position in a company which implements software using object oriented databases. these are something completely new for me as at university we never worked on it, just some theory. my questions are do you think is a good way to start my career as developer? what is the job market for this type of developemnt? are these skills requested? what markets this technology touches? thanks

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  • How to spread changes in oriented graph?

    - by joseph
    Hello. I have oriented graph. Graph can be strongly connected. Every vertix can have a set of anything, for example letters. The set is user editable. Every vertix makes intersection of sets in previous vertices (only one step back). But now, there is problem: When I update set of one vertex, the change should expand to all vertices and uptate their intersection of sets of previous vertices. How to do every vertex have correct intersection after update of any vertex? Restriction: algorithm must avoid to stick in infinity. Any idea how to solve it?

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  • Difference between Document-oriented-DB and Bigtable clones

    - by chen
    We are looking for a suitable storage engine for our weblog history data. We looked at Bigtable's paper and understand it is suitable to us well. However, I also understand that Document-oriented-DB such as MongoDB seems to provide a little more powerful schema power -- i.e, it can model our data as well. I wonder how nowadays ppl choose a scalable NoSQL DB --- I read enough articles like "we looked at A, B and C, and we decided to use C". But I'd like to see some benchmark number. What I am saying is that if MongoDB and the like can provide same level of performance as Bigtable clones, why don't web companies choose it (preparing to deal with various potentially more complex data problem)? Thanks, By the way, I read an article (which convinced me at the moment) saying Cassandra does not fit the M/R operation, any comments?

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  • How to document object-oriented MATLAB code?

    - by jjkparker
    I'm writing a sizable application using object-oriented MATLAB, and this has gotten me thinking about how to document the code. If this was C, I would use Doxygen. For Java, I'd use JavaDoc. Both have mostly agreed-upon standards for how class and method documentation should look and what it should contain. But what about MATLAB code? The most I've seen in TMW's own classes is a short sentence or two at the top of the class, and I can't find any topics devoted to documenting sizable MATLAB applications. So how do you document your MATLAB classes? Any particular style issues or additional tools?

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  • Developer oriented hardware benchmarks?

    - by Promit
    Perhaps I'm looking in the wrong places, but every hardware benchmark I've found, for nearly any component, is oriented towards gamers and/or workstations (video editing etc). Is there anyone doing benchmarks that are relevant to software developers? For example, take SSDs. I don't care how fast Crysis loads off an SSD -- that is completely worthless information. What I want to know is, which drive yields the quickest build times? What about Intellisense and refactoring operations? What RAID configuration has the biggest benefit? I could probably come up with more examples, but you get the point. Long story short, where are the benchmarks that tell me which hardware will be most effective in helping me be a productive software developer?

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  • Spring Roo and aspect-oriented programming

    - by marcos
    Hello, i've been running some experiments of my own with Spring Roo and it seems to be pretty cool, but i noticed that this tool makes heavy use of AOP on the model layer. I'm thinking about creating a real project using Roo and what i would like to know is: Why AOP is everywhere? Is That ok? What are advantages and disadvantages of this approach? I'm quite new to aspect-oriented programming and some guidance would be greatly appreciated. Thanks in advance!

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  • Aspect Oriented Programming vs List<IAction> To execute methods based on conditions

    - by David Robbins
    I'm new to AOP so bear with me. Consider the following scenario: A state machine is used in a workflow engine, and after the state of the application is changed, a series of commands are executed. Depending on the state, different types of commands should be executed. As I see it, one implementation is to create List<IAction> and have each individual action determine whether it should execute. Would a Aspect Oriented process work as well? That is, could you create an aspect that notifies a class when a property changes, and execute the appropriate processes from that class? Would this help centralize the state specific rules?

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  • Object Oriented PHP Best Practices

    - by user270797
    Say I have a class which represents a person, a variable within that class would be $name. Previously, In my scripts I would create an instance of the object then set the name by just using: $object->name = "x"; However, I was told this was not best practice? That I should have a function set_name() or something similar like this: function set_name($name) { $this->name=$name; } is this correct? If in this example I want to insert a new "person" record into the db, how do I pass all the information about the person ie $name, $age, $address, $phone etc to the class in order to insert it, should I do: function set($data) { $this->name= $data['name']; $this->age = $data['age']; etc etc } Then send it an array? Would this be best practice? or could someone please recommend best practice?

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  • Simple Remote Shared Object with Red5 Flash Server

    - by John Russell
    Hello, I am trying to create a simple chat client using the red5 media server, but I seem to be having a slight hiccup. I am creating a shared object on the server side, and it seems to be creating it successfully. However, when I make changes to the object via the client (type a message), the SYNC event fires, but the content within the shared object remains empty. I suspect I am doing something wrong on the java end, any advice? Console Results: Success! Server Message: clear Server Message: [object Object] Local message: asdf Server Message: change Server Message: [object Object] Local message: fdsa Server Message: change Server Message: [object Object] Local message: fewa Server Message: change Server Message: [object Object] Server Side: package org.red5.core; import java.util.List; import org.red5.server.adapter.ApplicationAdapter; import org.red5.server.api.IConnection; import org.red5.server.api.IScope; import org.red5.server.api.service.ServiceUtils; import org.red5.server.api.so.ISharedObject; // import org.apache.commons.logging.Log; // import org.apache.commons.logging.LogFactory; public class Application extends ApplicationAdapter { private IScope appScope; // private static final Log log = LogFactory.getLog( Application.class ); /** {@inheritDoc} */ @Override public boolean connect(IConnection conn, IScope scope, Object[] params) { appScope = scope; createSharedObject(appScope, "generalChat", false); // Creates general chat shared object return true; } /** {@inheritDoc} */ @Override public void disconnect(IConnection conn, IScope scope) { super.disconnect(conn, scope); } public void updateChat(Object[] params) { ISharedObject so = getSharedObject(appScope, "generalChat"); // Declares and stores general chat data in general chat shared object so.setAttribute("point", params[0].toString()); } } Client Side: package { import flash.display.MovieClip; import flash.events.*; import flash.net.*; // This class is going to handle all data to and from from media server public class SOConnect extends MovieClip { // Variables var nc:NetConnection = null; var so:SharedObject; public function SOConnect():void { } public function connect():void { // Create a NetConnection and connect to red5 nc = new NetConnection(); nc.addEventListener(NetStatusEvent.NET_STATUS, netStatusHandler); nc.connect("rtmp://localhost/testChat"); // Create a StoredObject for general chat so = SharedObject.getRemote("generalChat", nc.uri, false); so.connect(nc); so.addEventListener(SyncEvent.SYNC, receiveChat) } public function sendChat(msg:String) { trace ("Local message: " + msg); nc.call("updateChat", null, msg) } public function receiveChat(e:SyncEvent):void { for (var i in e.changeList) { trace ("Server Message: " + e.changeList[i].code) trace ("Server Message: " + e.changeList[i]) } } // Given result, determine successful connection private function netStatusHandler(e:NetStatusEvent):void { if (e.info.code == "NetConnection.Connect.Success") { trace("Success!"); } else { trace("Failure!\n"); trace(e.info.code); } } } }

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