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  • How to make natural-looking paths with A* on a grid?

    - by user11177
    I've been reading this: http://theory.stanford.edu/~amitp/GameProgramming/Heuristics.html But there are some things I don't understand, for example the article says to use something like this for pathfinding with diagonal movement: function heuristic(node) = dx = abs(node.x - goal.x) dy = abs(node.y - goal.y) return D * max(dx, dy) I don't know how do set D to get a natural looking path like in the article, I set D to the lowest cost between adjacent squares like it said, and I don't know what they meant by the stuff about the heuristic should be 4*D, that does not seem to change any thing. This is my heuristic function and move function: def heuristic(self, node, goal): D = 10 dx = abs(node.x - goal.x) dy = abs(node.y - goal.y) return D * max(dx, dy) def move_cost(self, current, node): cross = abs(current.x - node.x) == 1 and abs(current.y - node.y) == 1 return 19 if cross else 10 Result: The smooth sailing path we want to happen: The rest of my code: http://pastebin.com/TL2cEkeX

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  • Webcast: SANS Institute Product Review of Oracle Identity Manager 11gR2

    - by B Shashikumar
    Translating the IT-centric, directory based view of access and authorization into the process-driven concerns of business users inevitably creates unique challenges. Enterprises struggle to determine which users have access to what resources and what they are doing with that access. Enforcing governance controls is critical to reduce the risk that an employee or malicious third party with excessive access will take advantage of that access. Dave Shackleford, SANS analyst, recently reviewed the User Provisioning capabilities of Oracle Identity Manager 11gR2. In this webcast, attendees will hear from Dave and other Oracle and customer experts on: The key challenges associated with implementing self-service user provisioning Oracle’s unique online “shopping cart” model for self-service access request Real world case study of user provisioning Best practices for deployment Register today, for this complimentary webcast, hosted by The SANS Institute. Attendees will be among the first to receive a new SANS Analyst Whitepaper on this subject. When: Thur Sep 27  9am PT/12p ET Where: Register here

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  • Clouds, Clouds, Clouds Everywhere, Not a Drop of Rain!

    - by sxkumar
    At the recently concluded Oracle OpenWorld 2012, the center of discussion was clearly Cloud. Over the five action packed days, I got to meet a large number of customers and most of them had serious interest in all things cloud.  Public Cloud - particularly the Oracle Cloud - clearly got a lot of attention and interest. I think the use cases and the value proposition for public cloud is pretty straight forward. However, when it comes to private cloud, there were some interesting revelations.  Well, I shouldn’t really call them revelations since they are pretty consistent with what I have heard from customers at other conferences as well as during 1:1 interactions. While the interest in enterprise private cloud remains to be very high, only a handful of enterprises have truly embarked on a journey to create what the purists would call true private cloud - with capabilities such as self-service and chargeback/show back. For a large majority, today's reality is simply consolidation and virtualization - and they are quite far off from creating an agile, self-service and transparent IT infrastructure which is what the enterprise cloud is all about.  Even a handful of those who have actually implemented a close-to-real enterprise private cloud have taken an infrastructure centric approach and are seeing only limited business upside. Quite a few were frank enough to admit that chargeback and self-service isn’t something that they see an immediate need for.  This is in quite contrast to the picture being painted by all those surveys out there that show a large number of enterprises having already implemented an enterprise private cloud.  On the face of it, this seems quite contrary to the observations outlined above. So what exactly is the reality? Well, the reality is that there is undoubtedly a huge amount of interest among enterprises about transforming their legacy IT environment - which is often seen as too rigid, too fragmented, and ultimately too expensive - to something more agile, transparent and business-focused. At the same time however, there is a great deal of confusion among CIOs and architects about how to get there. This isn't very surprising given all the buzz and hype surrounding cloud computing. Every IT vendor claims to have the most unique solution and there isn't a single IT product out there that does not have a cloud angle to it. Add to this the chatter on the blogosphere, it will get even a sane mind spinning.  Consequently, most  enterprises are still struggling to fully understand the concept and value of enterprise private cloud.  Even among those who have chosen to move forward relatively early, quite a few have made their decisions more based on vendor influence/preferences rather than what their businesses actually need.  Clearly, there is a disconnect between the promise of the enterprise private cloud and the current adoption trends.  So what is the way forward?  I certainly do not claim to have all the answers. But here is a perspective that many cloud practitioners have found useful and thus worth sharing. To take a step back, the fundamental premise of the enterprise private cloud is IT transformation. It is the quest to create a more agile, transparent and efficient IT infrastructure that is driven more by business needs rather than constrained by operational and procedural inefficiencies. It is the new way of delivering and consuming IT services - where the IT organizations operate more like enablers of  strategic services rather than just being the gatekeepers of IT resources. In an enterprise private cloud environment, IT organizations are expected to empower the end users via self-service access/control and provide the business stakeholders a transparent view of how the resources are being used, what’s the cost of delivering a given service, how well are the customers being served, etc.  But the most important thing to note here is the enterprise private cloud is not just an IT project, rather it is a business initiative to create an IT setup that is more aligned with the needs of today's dynamic and highly competitive business environment. Surprised? You shouldn’t be. Just remember how the business users have been at the forefront of public cloud adoption within enterprises and private cloud is no exception.   Such a broad-based transformation makes cloud more than a technology initiative. It requires people (organizational) and process changes as well, and these changes are as critical as is the choice of right tools and technology. In my next blog,  I will share how essential it is for enterprise cloud technology to go hand-in hand with process re-engineering and organization changes to unlock true value of  enterprise cloud. I am sharing a short video from my session "Managing your private Cloud" at Oracle OpenWorld 2012. More videos from this session will be posted at the recently introduced Zero to Cloud resource page. Many other experts of Oracle enterprise private cloud solution will join me on this blog "Zero to Cloud"  and share best practices , deployment tips and information on how to plan, build, deploy, monitor, manage , meter and optimize the enterprise private cloud. We look forward to your feedback, suggestions and having an engaging conversion with you on this blog.

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  • Free web "caching" services for a web service

    - by Jason Banico
    I have a web service on Google App engine whose data is updated on a daily basis. To minimize bandwidth utilization from mobile clients connecting to it, I'd like to instead have an intermediary site where the clients will be getting their data from, and minimizing hits to my service to once or twice a day only. Is there such a service I can use? I'd like to explore this "pull" option first, before considering "push" options such as publishing to a blog site or a free website host that doesn't have bandwidth caps.

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  • Scripty2 in Action

    <b>PACKT Publishing: </b>"In this article by Jose Argudo, we will explore scripty2 library. We will discuss the core aspects of scripty2 right from how to get started to Scripty2 UI and Scripty2 FX."

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  • Did you download the Office RTM before May 1st?

    - by simonsabin
    If so then you may find the product key you have doesn’t enable all the functionality. Looking at the list of what isn’t enabled its the collaboration stuff like workflow and publishing to libraries. You can read more with the KB article http://support.microsoft.com/default.aspx/kb/983473?p=1...(read more)

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  • How to dynamically generate PDF documents

    - by Thomas
    I want to build a web application for generating stylish PDF documents. The layout should be based on a design templates and the data should come dynamically from the database. Ideally I want to design the template in a "publishing like" tool with placeholders and replace these placeholders by the web application with the data from the database. Think of something like an invoice generator, where a customer could choose from different invoice templates and the invoice data itself coming from the DB. Thanks for your ideas!

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  • SignalR Book

    - by eddraper
    Originally posted on: http://geekswithblogs.net/eddraper/archive/2013/06/30/signalr-book.aspx  Just finished SignalR: Real-time Application Development from Packt Publishing.  It’s a really great read for those wanting a holistic view of SignalR as a true application building block.  In many respects I think that SignalR could end up being a game changer for entirely new classes of both apps and frameworks. I’d love to see the puppy plugged into a rich client side ORM…

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  • Depending on another open source library: copy/paste code or include

    - by user5794
    I'm working on a large class and started implementing new features that need graphics. I started writing the graphics functions myself, but I know that open source libraries exist that can provide me with this functionality without me having to write it myself. The problem is that I prefer the class to be self-sufficient and not dependent on any other library. If I don't write it myself, I would have to ask the user to make sure a graphics library is already installed (less user-friendly). If I write it myself, I do a lot more work than I have to. I could also copy/paste some of the relevant code into my own class, but not sure about the disadvantages of doing this (it's an open source library that matches my license, so I'm not concerned with legality, just programming-wise if there are disadvantages). So what should I do: copy paste code from the external library write the code myself so it's truly self-sufficient ask the user to download and install another library

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  • When failure is a feature

    Warning: this post is going to be slightly off-topic and non-technical. Well, not computer science technical at least. I was reading an article in SciAm this morning about the possibility of a robot uprising. Dont laugh yet, this is a very real, if still quite remote possibility. The main idea that was described was that AI could rise one day to self-awareness and to an ability to improve itself through self-replication beyond human abilities to control it. Sure, thats one possibility, and some...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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  • My Blog is marked as spam because of adBrite

    - by Thala
    I was blogging for over a month. I never thought of publishing ads in my blog until I was recommended to adBrite. I copied the widget code and just added it to my blog. Crap, suddenly I got a message that I was stopped from blogging because it is marked as spam. I never gave up my try, I just kept on sending request to retrieve my blog. How do I get my blogger blog unlocked and not considered spam?

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  • What's the canonical way to acknowledge many FOSS sources in a single project?

    - by boost
    I have a project which uses a large number of LGPL, Artistic and other open-source licensed libraries. What's the canonical (i.e. the "standard") way of acknowledging multiple sources in a single project download? Also, some of the sources I've used are from sites where using the code is okay, but publishing the source isn't. What's the usual manner of attribution in that case, and the usual manner of making the source available in an open-source project?

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  • Where is a Web Development Career fueled by Passion?

    - by JMC Creative
    Quick Background Since learning basic html 5 years ago, I've become completely obsessed with the technology, the logic, and the thrill of solving problems involved with building websites. I am still stuck at a thoroughly non-programming type job, but would really like to move into the field of web programming/design. I have no educational background in the field (was trained as a fine artist and tutor), but in the past few years have progressed fully self-taught (and self-motivated) from html to css to php, mysql, jquery, and am now building rich web applications. The Question How can I prove to a company that even though I have no education, I have a passion to learn whatever is thrown my way? ...That essentially I would come at every issue with not only knowledge, but with a passionate desire to solve it, whether that means tackling a new language or debugging code for hours at a time? p.s. Sorry for the stupid title.

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  • Wall avoidance steering

    - by Vodemki
    I making a small steering simulator using the reynolds boid algorythm. Now I want to add a wall avoidance feature. My walls are in 3D and defined using two points like that: ---------. P2 | | P1 .--------- My agents have a velocity, a position, etc... Could you tell me how to make avoidance with my agents ? Vector2D ReynoldsSteeringModel::repulsionFromWalls() { Vector2D force; vector<Wall *> wallsList = walls(); Point2D pos = self()->position(); Vector2D velocity = self()->velocity(); for (unsigned i=0; i<wallsList.size(); i++) { //TODO } return force; } Then I use all the forces returned by my boid functions and I apply it to my agent. I just need to know how to do that with my walls ? Thanks for your help.

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  • Monday Poll: What is the Key to Successful Projects?

    - by user462779
    The November 2012 issue of Profit features a focus on project management. In this week's LinkedIn poll, we're asking: "What do you think is most important for getting projects done successfully?" Vote and share your insights with the Profit LinkedIn community. In a new feature, debuting in the February 2013 issue of Profit, we'll be publishing key user comments related to the Monday poll in the table of contents of the magazine. So click that link, share you're thoughts on subject could end up in Profit!

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  • What's the best way to acknowledge many FOSS sources in a single project?

    - by boost
    I have a project which uses a large number of LGPL, Artistic and other open-source licensed libraries. What's the canonical (i.e. the "standard") way of acknowledging multiple sources in a single project download? Also, some of the sources I've used are from sites where using the code is okay, but publishing the source isn't. What's the usual manner of attribution in that case, and the usual manner of making the source available in an open-source project?

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  • python factory function best practices

    - by Jason S
    Suppose I have a file foo.py containing a class Foo: class Foo(object): def __init__(self, data): ... Now I want to add a function that creates a Foo object in a certain way from raw source data. Should I put it as a static method in Foo or as another separate function? class Foo(object): def __init__(self, data): ... # option 1: @staticmethod def fromSourceData(sourceData): return Foo(processData(sourceData)) # option 2: def makeFoo(sourceData): return Foo(processData(sourceData)) I don't know whether it's more important to be convenient for users: foo1 = foo.makeFoo(sourceData) or whether it's more important to maintain clear coupling between the method and the class: foo1 = foo.Foo.fromSourceData(sourceData)

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  • Connect players with same phone language settings

    - by Abin George
    I am working on a turn-based multiplayer game using game center. The game also use Spanish localisation. It is enabled by reading the device language settings. Now my requirement is: When i start a turn based match, my opponent should have the same language setting in his/her phone as I am having. How can I make this possible. I use the following code to connect - (void)findTurnBasedMatchWithViewcontroller:(UIViewController *)viewController forDelegate:(id)argDelegate { self.delegate = argDelegate; presentingViewController = viewController; GKMatchRequest *request = [[GKMatchRequest alloc] init]; request.minPlayers = 2; request.maxPlayers = 2; [manager setCurrentGameType:kTurnBased]; GKTurnBasedMatchmakerViewController *mmvc = [[GKTurnBasedMatchmakerViewController alloc] initWithMatchRequest:request]; mmvc.turnBasedMatchmakerDelegate = self; mmvc.showExistingMatches = NO; [presentingViewController presentViewController:mmvc animated:YES completion:^(void) { }]; }

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  • What are good HTML 5 and PHP 5 books to get? [closed]

    - by lardtard
    I am looking for beginner books into PHP 5 (Maybe with a bit into MySQL?) and HTML 5. I started self-teaching myself PHP although it has become a problem as the tutorials online are either outdated or just crap. I also managed to start learning with very little HTML knowledge so I am looking to brush up on my HTML knowledge and get more into PHP. I also am unsure weather I should be looking into XHTML or HTML5, or both so an answer to that would be splendid. I just want to become more self-sufficient and less reliant on other for my programming needs. I've searched Google for books but I'm just not sure which one is the "best" for me and makes for good practice and habits which brings me here.

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  • How to avoid oscillation by async event based systems?

    - by inf3rno
    Imagine a system where there are data sources which need to be kept in sync. A simple example is model - view data binding by MVC. Now I intend to describe these kind of systems with data sources and hubs. Data sources are publishing and subscribing for events and hubs are relaying events to data sources. By handling an event a data source will change it state described in the event. By publishing an event the data source puts its current state to the event, so other data sources can use that information to change their state accordingly. The only problem with this system, that events can be reflected from the hub or from the other data sources, and that can put the system into an infinite oscillation (by async or infinite loop by sync). For example A -- data source B -- data source H -- hub A -> H -> A -- reflection from the hub A -> H -> B -> H -> A -- reflection from another data source By sync it is relatively easy to solve this issue. You can compare the current state with the event, and if they are equal, you don't change the state and raise the same event again. By async I could not find a solution yet. The state comparison does not work by async event handling because there is eventual consistency, and new events can be published in an inconsistent state causing the same oscillation. For example: A(*->x) -> H -> B(y->x) -- can go parallel with B(*->y) -> H -> A(x->y) -- so first A changes to x state while B changes to y state -- then B changes to x state while A changes to y state -- and so on for eternity... What do you think is there an algorithm to solve this problem? If there is a solution, is it possible to extend it to prevent oscillation caused by multiple hubs, multiple different events, etc... ? update: I don't think I can make this work without a lot of effort. I think this problem is just the same as we have by syncing multiple databases in a distributed system. So I think what I really need is constraints if I want to prevent this problem in an automatic way. What constraints do you suggest?

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  • I am now ready to publish my commercial Android/IPhone/Anything application - what disclaimers should I use to protect myself?

    - by corgrath
    I have now written my last line of code and I am ready to publish my application to the Android Market, what disclaimers should I add to protect myself as a developer from customers who purchase my application, to prevent being sued by stupid people? It might be a harsh question, but how does developers protect themselves when publishing their software? Developers or small companies (for example all these iPhone/Android developers) that can't afford hiring a small army of lawyers, what should they do? Any solid text I can use?

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  • Cloud Migration Lifecycle

    - by llaszews
    The first step in migrating to the cloud is the set up phase. This phase includes: 1. Plan Cloud Setup - Create a project plan. 2. Set up infrastructure - The IaaS and PaaS environments need to be installed and configured. This includes databases, network, hardware, disk and application servers. 3. Set up shared components - Are applications, database objects or other components going to be made accessible in the cloud ? These shared components need to be configured and made accessible. 4. Set up self-service portal - Customer self service provisioning, management and monitoring.

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  • What is the correct way to implement hit detection with non-rectangular sprites?

    - by hogni89
    What is the correct way to implement hit or touch detection for non-rectangular sprites in Cocos2d? I am working on a jigsaw puzzle, so our sprites have some strange forms (jigsaw puzzle bricks). As of now, we have implemented the "detection" this way: - (void)selectSpriteForTouch:(CGPoint)touchLocation { CCSprite * newSprite = nil; // Loop array of sprites for (CCSprite *sprite in movableSprites) { // Check if sprite is hit. // TODO: Swap if with something better. if (CGRectContainsPoint(sprite.boundingBox, touchLocation)) { newSprite = sprite; break; } } if (newSprite != selSprite) { // Move along, nothing to see here // Not the problem } } - (BOOL)ccTouchBegan:(UITouch *)touch withEvent:(UIEvent *)event { CGPoint touchLocation = [self convertTouchToNodeSpace:touch]; [self selectSpriteForTouch:touchLocation]; return TRUE; } I know that the problem is in the keyword "sprite.boundingBox". Is there a better way of implementing this, or is it a limitation when using sprites based on .png's? If so, how should I proceed?

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