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  • Vectors with Circles Physics -java

    - by Joe Hearty
    This is a problem I've been having, When making a set number of filled circles at random locations on a JPanel and applying a gravity (a negative change in the y), each of the circles collide. I want them to have collision detection and push in the opposite direction using vectors but i don't know how to apply that to my scenario could someone help? public void drawballs(Graphics g){ g.setColor (Color.white); //displays circles for(int i = 0; i<xlocationofcircles.length-1; i++){ g.fillOval( (int) xlocationofcircles[i], (int) (ylocationofcircles[i]) ,16 ,16 ); ylocationofcircles[i]+=.2; //gravity if(ylocationofcircles[i] > 550) //stops gravity at bottom of screen ylocationofcircles[i]-=.2; //Check distance between circles(i think..) float distance =(xlocationofcircles[i+1]-xlocationofcircles[i]) + (ylocationofcircles[i+1]-xlocationofcircles[i]) ; if( Math.sqrt(distance) <16)

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  • Using mocks to set up object even if you will not be mocking any behavior or verifying any interaction with it?

    - by smp7d
    When building a unit test, is it appropriate to use a mocking tool to assist you in setting up an object even if you will not be mocking any behavior or verifying any interaction with that object? Here is a simple example in pseudo-code: //an object we actually want to mock Object someMockedObject = Mock(Object.class); EqualityChecker checker = new EqualityChecker(someMockedObject); //an object we are mocking only to avoid figuring out how to instantiate or //tying ourselves to some constructor that may be removed in the future ComplicatedObject someObjectThatIsHardToInstantiate = Mock(ComplicatedObject.class); //set the expectation on the mock When(someMockedObject).equals(someObjectThatIsHardToInstantiate).return(false); Assert(equalityChecker.check(someObjectThatIsHardToInstantiate)).isFalse(); //verify that the mock was interacted with properly Verify(someMockedObject).equals(someObjectThatIsHardToInstantiate).oneTime(); Is it appropriate to mock ComplicatedObject in this scenario?

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  • Installing internet explorer and windows media player in ubuntu?

    - by karthick87
    I need to install Internet Explorer and Windows Media Player to check an URL for testing purpose. Could someone post me the exact steps to acheive this task? Note: I have already tried installing IE in Ubuntu 10.10 and later versions (12.04) with Wine. It works fine. But I don't get success installing Windows Media Player. Hope someone will solve my problem. It will be great if someone gives me a neat solution for installing IE and WMP in Ubuntu (10.10 or later).

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  • How to fix “Install-SPSolution: Admin SVC must be running in order to create deployment timer job”

    - by ybbest
    When I try to install a SharePoint Solution using PowerShell, I got the error “How to fix Install-SPSolution: Admin SVC must be running in order to create deployment timer job”. The reason you got error is that SharePoint 2010 Administration is not started, so to fix it you just need to start the services. Problem: Solution: To fix the issues, you need to start the SharePoint 2010 Administration service. 1. Go to services control panel. 2. Start the SharePoint 2010 Administration service. 3. Rerun your PowerShell, it should fix the problem. However, you might get another problem “A deployment or retraction is already under way for the solution “*.wsp”, and only one deployment or retraction at a time is supported”, for this problem you can check my other blog here.

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  • Does the user agent in any regular browser contain 'bot' or 'crawl'?

    - by Echo
    Does the user agent in any regular browser contain 'bot' or 'crawl'? I check the user agent on my site to see if it is coming from a bot or not. If it is, I can do some little optimizations since they don't login. (I don't change the content at all) After adding checks for 30-40+ bots, I'm getting tired of added them. So I was wondering if checking if it just contains 'bot' or 'crawl'. I know that wont get all bots, but it would get a lot of them. But if that could cause any false positives, then it would totally mess up the ability to add to cart, place an order, and login in.

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  • should I create a new class for a specific piece of business logic?

    - by Riz
    I have a Request class based on the same Entity in my Domain. It currently only has property definitions. I'd like to add a method for checking a duplicate Request which I'll call from my controller. Should I add a method called CheckDuplicate in the Request class? Would I be violating the SRP? The method will need to access a database context to check already existing requests. I'm thinking creating another class altogether for this logic that accepts a datacontext as part of its constructor. But creating a whole new class for just one method seems like a waste too. Any advice?

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  • Ask the Readers: How Do You Find Your Next Book?

    - by Jason Fitzpatrick
    It’s never been easier to find book reviews, recommendations, and comparisons; tools which are more necessary than ever thanks to the increasing number of new titles on the market. This week we want to hear all about your techniques for picking your next book. Whether you consult the New York Times best seller list, pore over Amazon book reviews, use a book suggestion engine, or just buy whatever the local book store has on the end-cap display that month, we want to hear about your system for finding new books. Sound off in the comments with your technique (bonus points for including links to any services or sites you use) and then check back on Friday for the What You Said roundup to see how your fellow readers fill their book bags. Secure Yourself by Using Two-Step Verification on These 16 Web Services How to Fix a Stuck Pixel on an LCD Monitor How to Factory Reset Your Android Phone or Tablet When It Won’t Boot

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  • Viewing VMware Counters in PerfMon for SQL Server

    I want to ensure that my SQL Server on a VMware Guest OS is getting the resources it should. This would go a long way towards helping isolate the performance problems we're experiencing. However, our system administrators won't give us access to VirtualCenter or any of the tools they use. Is there anything I can do? Check out this tip to learn more. ‘The Case of the Missing Index’Discover the Top 5 hard-earned lessons of a DBA, presented by The DBA Team. Learn from lesson one now.

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  • Ask the Readers: How Do You Share Your Photos?

    - by Jason Fitzpatrick
    It’s easy to snap away and fill up a memory card, but not quite as easy to share your best pics with your friends and family. How do you get your pics from your camera to your friends’ monitors? This week we’re interested in hearing about your favorite photo sharing tools and techniques. What’s your workflow for getting your photos from your digital camera to the virtual desktops of friends around the globe? Sound off in the comments with your favorite resources, applications, and photo sharing tricks. Make sure to check in on Friday for the What You Said roundup to see how your fellow readers get the job done. 8 Deadly Commands You Should Never Run on Linux 14 Special Google Searches That Show Instant Answers How To Create a Customized Windows 7 Installation Disc With Integrated Updates

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  • Algorithm for determining grid based on variably sized "blocks"?

    - by Lite Byte
    I'm trying to convert a set of "blocks" in to a grid-like layout. The blocks have a width of either 25%, 33%, 50%, 66%, or 75% of their container and each row of the grid should try to fit as many blocks as possible, up to a total width of 100%. I've discovered that trying to do this while leaving no remaining blocks in the original set is very hard. Eventually, I think my solution will be to upgrade/downgrade various block sizes (based on their priority or something) so they all fit in to a row. Either case, before I do that, I thought I'd check if someone has some code (or a paper) demonstrating a solution to this problem already? And bonus points if the solution incorporates varying block heights in to its calculations :) Thanks!

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  • Want A Faster Installation? Use The 3-Step Update

    Heres tip to speed up DXperience installations. Use the Update option when upgrading between minor versions. The process is easier than uninstalling and reinstalling. In fact, there are only 4 screens to click through. Check out the screenshots below from my recent upgrade from the DXperience v2010.1.2 to v2010.1.3 release: Step 1: The installer will detect if you have a previous version installed that can be updated. If an update is possible then youll be presented with one option, Update: ...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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  • UK Data Breaches Up by 10 fold in 10 years.

    - by TATWORTH
    At http://www.v3.co.uk/v3-uk/news/2201863/uk-data-breaches-rocket-by-1-000-percent-over-past-five-years there is an interesting report on the increase in data breaches reported in the UK.A lot of this increase may simply a change in legislation that has made reporting a statutory obligation.Some questions to ask yourself:Are server logs checked for untoward activity?Do you have a reporting policy if something is amiss?Did you design security in for the start of your application design?Do you log for example failed logons?Do you run tools to check for code integrity?Is my defense, a strategy of defense in depth?Do you realise that 60% of hack attacks are internal?Whilst SQL Injection is a problem that affects practically all application code platforms, within Microsoft Applications do you run FXCOP? Do you run any of the other free tools for checking?

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  • Announcing Oracle WebLogic 12c

    - by alexismp
    While this blog is mostly devoted to GlassFish, you may be interested in the Oracle WebLogic Server 12c announcement scheduled for December 1st, 2011. The launch event is called "Introducing Oracle WebLogic Server 12c, the #1 Application Server Across Conventional and Cloud Environments" and will be split into Executive Overview and Developer Deep Dive sessions. The agenda description includes the following (emphasis is mine) : • Optimized to run your solutions for Java Platform, Enterprise Edition (Java EE); Oracle Fusion Middleware; and Oracle Fusion Applications • Enhanced with transformational platforms and technologies such as Java EE 6, Oracle’sActive GridLink for RAC, Oracle Traffic Director, and Oracle Virtual Assembly Builder On a slightly less official note but on that same topic, you should check out Steve Button's blog and twitter stream.

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  • wayfinder, paginator, or breadcrumb?

    - by LOTUSMS
    My question is fairly simple. I've heard one or two people call it a "wayfinder" and I personally call it "breadcrumb", then again "paginator" can also fit the bill. Bottom line is I can't seem to find what I need because I am not coming up with the right term. What I want is the following: I have a site with a multiple-pages form. I want my users to see the steps through the form. I searched for all three terms and nothing I can use has shown. I could build one from scratch but I am interested in what is out there. Someone may have done a better job than I will be doing. Any idea on what to call this and if you have a link I can check out, that will be bonus Thanks

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  • Data structure supporting the following operations

    - by 500865
    I'm looking for a data structure for working with a set of data which is most efficient to do the following : Check whether an item has been categorized or not. (The categorized and uncategorized set are disjoint sets). Get the category of an item. Get all the items in a particular category. Get all the uncategorized items. Remove a particular item from the data set. I was thinking of having a Dictionary<String, Set<String>> to hold all the items in a given category, but that doesn't solve 2.

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  • Designing a single look up entity

    - by altsyset
    In almost every application you have this look up entity that provides a dynamic references. This are things like type, category, etc. These entities will always have id, name, desc So at first I designed different entities for each look up. Like education_type, education_level, degree_type.... But on a second thought I decided to have on entity for each of these kinds of entities. But when I am done with the design and check the relation this entity will be referenced by almost all entities in the system and I don't believe that is appropriate. So What is your take on this? Can you give me some clear pros and cons?

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  • Event Aggregator.. not getting a response, how to determine completion?

    - by Duncan_m
    I'm rewriting a vehicle tracking application, a google maps based thing.. The users are able to search for a vehicle by typing a few characters of the vehicles "callsign". My application is based around a sort of "event bus" within Backbone.. when a search occurs I send a message on the bus saying something like "does anyone match this?".. If a marker matches the search term it responds with a sort of "yes, I match!".. My challenge arises when no-one matches, I get no response.. it feels a little hacky to "wait a little while" and check if a response has been recieved.. The application is based around Backbone.js and using the Event Aggregator pattern described in the answer to this question on Stack Overflow: http://stackoverflow.com/questions/7708195/access-function-in-one-view-from-another-in-backbone-js Is there a well defined design pattern that might assist me here? Sending a request for a response and not getting any responses?

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  • Ask the Readers: What Are Your Must Have Presentation Tools?

    - by Jason Fitzpatrick
    Giving a presentation, be it in front of the Board of Directors or a roomful of students, has come a long way from paper handouts and poster boards. This week we want to hear about your must-have presentation tools. Whether your must-have tool is a piece of hardware, an application, or a web-based tool, we want to hear all about it. Sound off in the comments with your favorite presentation tool and how it helps you present better. Make sure to check back in on Friday for the What You Said roundup to scope out your fellow readers’ tips and tricks. How To Create a Customized Windows 7 Installation Disc With Integrated Updates How to Get Pro Features in Windows Home Versions with Third Party Tools HTG Explains: Is ReadyBoost Worth Using?

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  • How can I design multi-threaded application for larger user base

    - by rokonoid
    Here's my scenario, I need to develop a scalable application. My user base may be over 100K, every user has 10 or more small tasks. Tasks check every minute with a third party application through web services, retrieving data which is written in the database, then the data is forwarded to it's original destination. So here's the processing of a small task: while(true){ Boolean isNewInformationAvailable = checkWhetherInformationIsAvailableOrNot(); If(isNewInformationAvailable ==true){ fetchTheData(); writeToDatabase(); findTheDestination(); deliverTheData(); isAvailable =false; } } As the application is large, how should I approach designing this? I'm going to use Java to write it. Should I use concurrency, and how would you manage the concurrency?

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  • windows are moving slowly on ubuntu 11.10

    - by myildirim
    Video Card : ATI Mobility Radeon HD 3650 Therefore my video card ATI when i check system info Driver : VESA: M86 Experience : Fallback i checked compiz config manager and disable all effects insipite of this windows are moving slowly.It does not for all windows,for example when i use google chrome and scrool up/down there is no effect but when i move window to another position it moves slowly but when i use pdf reader when i scrool up or down it moves slowly.How can i solve this ? i use core 2 duo intel cpu and run ubuntu 11.10. Edit : The Solution : Upgrade kernel and then update all graphic card drivers.Now there is no problem .

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  • localhost .htaccess not working?

    - by diff
    Now i install WordPress then BuddyPress, after the install buddypress i run the site, home page was run, when click the other page link the page was not working. show this error Not Found The requested URL /Repo/website/groups/ was not found on this server. Apache/2.2.17 (Ubuntu) Server at localhost Port 80 After then i check my local htaccess, here is all are ok, but why the problem is showing. Here is my local htaccess .. <Directory /> Options FollowSymLinks AllowOverride all </Directory> <Directory /var/www/> Options Indexes FollowSymLinks MultiViews AllowOverride all Order allow,deny allow from all </Directory> ScriptAlias /cgi-bin/ /usr/lib/cgi-bin/ <Directory "/usr/lib/cgi-bin"> AllowOverride None Options +ExecCGI -MultiViews +SymLinksIfOwnerMatch Order allow,deny Allow from all </Directory>

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  • Everything you need to know about Silverlight 4

    Silvertlight 4 got release this week and with that blogs and social media got a fantastic coverage of the details, hopefully I got the ones that will help you to get started fast. Step 1: Install VS2010 unless you want to keep using the WP7 SDK to write applications, the new release does not include the beta of Windows Phone 7. http://www.microsoft.com/visualstudio/en-us/download Step 1.5: If you developing apps for Window Phone 7 check this link for the information. Step 2: Make sure your...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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  • Silverlight 4 + RIA Services - Ready for Business: Validating Data

      To continue our series lets look at data validation our business applications. Updating data is great, but when you enable data update you often need to check the data to ensure it is valid.  RIA Services as clean, prescriptive pattern for handling this.   First lets look at what you get for free.  The value for any field entered has to be valid for the range of that data type.  For example, you never need to write code to ensure someone didnt type is forty-two into...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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  • IE9

    - by xamlnotes
    Hot dog. IE 9 just hit the download sites this week. I have been running it for a few days and its really sweet. It seems much faster than IE 8 and many other browsers and its got lots of cool features. Some of the ones I really like are: New tab format with one click creation and putting them up top. Cleaner UI Ability to drag a tab off the tab bar and have a new window created Integrated address / search box Support for HTML 5   check out http://www.beautyoftheweb.com/ to see some of the cool features. Pay attention to the HTML 5 samples too. And theres lots more as its just getting off the ground. You can download it from Microsoft. Or you can get the version with hooks into bing and msn. Enjoy.

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  • Great F# getting started online book

    - by MarkPearl
    So I have been battling around with F# for a few weeks and it has been frustrating just getting my brain around the syntax etc. Then someone put a comment on my blog that I should check out the following online book called the F# Survival Guide. I highly recommend those wanting to get into the basics of the language to go through this resource. It is easy to understand, especially for someone coming from a C# background. Give it a read… it gets a two thumbs up from me!

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