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  • Box 2D Collision Question

    - by Farooq Arshed
    I am very new to Box 2D Physics world. I wanted to know how to collide 2 bodies when one is Dynamic and other is Kinematic. The whole Scenario is explained below: I have 3 balls in total. I want to balls to remain in their places and the third ball to be able to move. When the third ball hits the other two balls then they should move according to the speed and direction from which they were hit. My gravity of the world is 0 because I only want z-axis gravity. I would also like some one to point me towards some good tutorials regarding Box 2D basics which is language independent. I hope I have explained my scenario well. Thanks for the help in advance.

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  • Does the EU cookie law apply to an EU site that is hosted outside of the EU?

    - by mickburkejnr
    I have been reading up about this EU cookie law, and have also had in depth conversations with my girlfriend who is a solicitor/lawyer and with colleagues while building websites. While we are now working towards implementing a way to abide by the EU law, I have thought of something which no one really knows the answer to and has caused a few arguments. It's my understanding that any website in the EU must abide by these cookie laws, which is understandable. However, say if I were to have a .co.uk or .eu domain name pointing to a website which is hosted in America for example, do I still need to abide by the EU laws even though the website is hosted outside of the EU? One person I have asked has said that because the domain name is .co.uk or .eu (a European TLD) then the website is still accountable under EU law. Another person I have asked has said because the actual website is held outside of the EU, it doesn't actually have to bother with this law.

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  • Coordinating team code review sessions [closed]

    - by Wade Tandy
    My question has two parts: 1) In your team or organization, do you ever do in-person code reviews with all or part of a team, as opposed to online reviews using some sort of tool? 2) How do you structure these meetings? Do you choose to focus on one person's code in a given meeting? Do you look at everything? Take a random sample? Ask people on the team what they'd like to have looked at of theirs? I'd love to add this practice to my development team, so I'd like to hear how others are doing it.

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  • GRUB is not Booting Correctly

    - by msknapp
    I have a PC with three hard disks. Windows 7 is installed on the first, Ubuntu 14.04 is installed on the third. After I re-booted, it went straight to Windows 7. So I tried explicitly telling my PC to boot using the third hard disk, but that just takes me to the grub rescue prompt. I followed Scott Severence's instructions here to try and recover. Essentially, I updated grub, reinstalled grub, and then updated it again. After re-booting, absolutely nothing had changed. So instead I tried using the boot-repair tool. In the past it had failed for me, saying that I had programs running and it could not unmount drives, when I was running nothing. I never figured out how to solve that problem, but it went away when I bought another hard drive and used that for my Ubuntu installation, I don't know why. In any case, I ran the boot-repair tool and this time it said it was successful. First time for everything right? I re-booted, only to be taken straight to the grub rescue prompt. So I changed my BIOS settings to use the third hard disk for boot start up. That is the same hard drive where I have Ubuntu and grub installed, and the same one that the grub-repair tool told me to use. It still took me straight to the grub rescue prompt. So I went from not being able to boot Ubuntu, to not being able to boot either OS installed on my system. Thanks boot-repair! Boot repair gave me this URL for future troubleshooting: http://paste.ubuntu.com/8131669 When I try to boot from the third hard disk, this is my console: Loading Operating System ... error: attempt to read or write outside of disk 'hd0'. Entering rescue mode... grub rescue> grub rescue> set cmdpath=(hd0) prefix=(hd0,gpt2)/boot/grub root=hd0,gpt2 grub rescue> ls (hd0) (hd0,gpt3) (hd0,gpt2) (hd0,gpt1) (hd1) (hd2) (hd2,gpt2) (hd2,gpt1) (hd3) Those values look correct to me. I have also experimented with changing some of those values, but 'insmod normal' always throws the same error. Somebody please tell me how to fix this. I have tried everything, reinstalling grub, and running boot-repair. =========================== Update: I think the problem might be that the ubuntu installer did not partition my hard disk correctly. I booted from live USB and then launched gparted and looked at how it partitioned things. This is what gparted says: Partition, File System, Size, Used, Unused, Flags /dev/sda1 (!), unknown, 1.00 MiB, ---, ---, bios_grub /dev/sda2, ext4, 2.71 TiB, 47.30 GiB, 2.67 TiB, /dev/sda3, linux-swap, 16.00 GiB, 0.00 B, 16.00 GiB, So that first line looks problematic. It is supposed to be the /boot partition. However, it was given only 1 MiB? I am assuming that MiB is actually supposed to mean megabyte, no idea why that 'i' is there. It also says the file system is unknown. I read the answer by andrew here, and he says he had to do a custom install, explicitly configuring the boot partition. So I think that maybe Ubuntu's installer has a bug in it, where it does not set up the boot partition correctly if you are not installing on the first hard disk in your computer. I am going to try reinstalling with a custom partition scheme. I read elsewhere (askubuntu won't let me post another link) that I don't even need a /boot partition any more. So instead of following Andrew's instructions ver batim, I'm first going to try having just two partitions: one for /, and another for my 16GB swap space. Both as primary partitions. The first will be formatted as ext4. If that doesn't work, I may try again using /boot. ======================== So I did my custom install with no /boot partition, and it did not work. When I rebooted, I had an error message saying that some address did not exist. So for the hundredth time, I booted from the live USB, and ran boot-repair. Now I get this message GPT detected. Please create a BIOS-Boot partition (>1MB, unformatted filesystem, bios_grub flag). This can be performed via tools such as Gparted. Then try again. I feel like I'm running in circles and nobody will help me.

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  • Chargeback and billing across public and private clouds

    - by llaszews
    Had a great conversation today regarding the need for metering, chargeback, and billing of cloud computing resources. The person I spoken with at a Fortune 1000 company increased the scope and magnitude of the issue of billing for cloud computing resources beyond what I had previously considered. I believed that doing any type of chargeback and billing for one public, private or hybrid installation was difficult. This person pointed out that the problem is even bigger in scope. The reality is many companies are using multiple public cloud vendors and have many different private cloud data centers. A customer may use AWS for some smaller public cloud applications, Salesforce.com (SaaS), Rackspace for IaaS, Savvis for colocation and a variety of Iaas and PaaS implementations for the private cloud. How does a company get a consolidated bill for all these different cloud environments? I am not sure their is an answer right now.

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  • Why to let / not let developers test their own work

    - by pyvi
    I want to gather some arguments as to why letting a developer testing his/her own work as the last step before the product goes into production is a bad idea, because unfortunately, my place of work sometimes does this (the last time this came up, the argument boiled down to most people being too busy with other things and not having the time to get another person familiar with that part of the program - it's very specialised software). There are test plans in this case (though not always), but I am very much in favor of making a person who didn't make the changes that are tested actually doing the final testing. So I am asking if you could provide me with a good and solid list of arguments I can bring up the next time this is discussed. Or to provide counter-arguments, in case you think this is perfectly fine especially when there are formal test cases to test.

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  • Can i use aac in an commercial app for free?

    - by Jason123
    I was wondering if i can use the aac codec in my commercial app for free (through lgpl ffmpeg). It says on the wiki: No licenses or payments are required to be able to stream or distribute content in AAC format.[36] This reason alone makes AAC a much more attractive format to distribute content than MP3, particularly for streaming content (such as Internet radio). However, a patent license is required for all manufacturers or developers of AAC codecs. For this reason free and open source software implementations such as FFmpeg and FAAC may be distributed in source form only, in order to avoid patent infringement. (See below under Products that support AAC, Software.) But the xSplit program had to cancel the AAC for free members because they have to pay royalties per person. Is this true (that you have to pay per each person that uses aac)? If you do have to pay, which company do you pay to and how does one apply?

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  • Rollback in Oracle and SQL Server

    - by CatherineRussell
    I have an Oracle background. It was interesting to see how rollback handled in Oracle and SQL Server. There is no begin trans in Oracle.  What oracle does is it will store the data in a temporary area called the rollback segments. Untill your issue the commit command the records will be kept there. You can even rollback your update statement by issuing the rollback command. When you issue the commit command the records in the rollback segments are written to the redo log files. The same logic for insert is also applicable except that there is no mirror image of the record kept.   In SQL Server, if you want to be able to roll back statement, you neet to start your statement with a "begin tran" . Then, you can rollback a transaction, if this is needed. begin tran update Person set FirstName = 'Arthur' where PersonId = 10 -- select firstname from Person rollback

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  • Reasons to Use a VM For Development

    - by George Stocker
    Background: I work at a start-up company, where one team uses Virtual Machines to connect to a remote server to do their development, and another team (the team I'm on) uses local IIS/SQL Server 2005/Visual Studio installations to conduct work. Team VM is located about 1000 miles from Team Non-VM, and the servers the VMs run off of are located near Team VM (Latency, for those that are wondering, is about 50ms). A person high in the company is pushing for Team Non-VM to use virtual machines for programming, development, and testing. The latter point we agree on -- we want Virtual Machines to test configurations and various aspects of the web application in a 'clean' state. The Problem: What we don't agree on is having developers using RDP to connect to a desktop remotely that contains Visual Studio, SQL Server, and IIS to do the same development we could do locally on our laptops. I've tried the VM set-up, and besides the color issue, there is a latency issue that is rather noticeable, not to mention that since we're a start-up, a good number of employees work from home on occasion with our work laptops, and this move would cut off the laptops. They'd be turned in. Reasons to Use Remote VMs for Development (Not Testing!): Here are the stated reasons that this person wants us to use VMs: They work for TeamVM. They keep the source code "safe". If we want to work from home, we could just use our home PCs. Licenses (I don't know what the argument is, only that it's been used). Reasons not to use Remote VMs for Development: Here are the stated reasons why we don't want to use VMs: We like working from home. We get a lot done on our own time. We're not going to use our Home PCs to do work related stuff. The Latency is noticeable. Support for the VMs (if they go down, or if we need a new VM) takes a while. We don't have administrative privileges on the VM, and are unable to change settings as needed. What I'm looking for from the community is this: What reasons would you give for not using VMs for development? Keep in mind these are remote VMs -- this isn't a VM running on a local desktop. It's using the laptop (or a desktop) as a thin client for a remote VM. Also, on the other side of the coin: Is there something we're missing that makes VMs more palatable for development? Edit: I think 'safe' is used in term of corporate espionage, or more correctly if the Laptop gets stolen, the person who stole would have access to our source code. The former (as we've pointed out, is always going to be a possibility -- companies stop that with litigation, there isn't a technical solution (so far as I can see)). The latter point is ( though I don't know its usefulness in a corporate scenario) mitigated by Truecrypt'ing the entire volume.

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  • You probably have enough

    - by BuckWoody
    This a decidedly non-technical post, and even a little preachy. I post it here because you, the technical professional, are the perfect audience for it. I have enough stuff. I never think so, of course, but I do. I don’t consider myself rich, but if you have a comfortable place to sleep,  enough food to eat and you can plan for your future, you are rich. And when we are rich enough to have “enough” stuff, that usually means we have too much stuff. Stuff costs money that could be put to better use, stuff needs painting, cleaning, fueling, feeding, storage and caring for. Stuff is a burden. So I decided a few years back that I had enough stuff. We gave away a lot of things, and we don’t buy any new (meaning we didn’t have one before)  things – only replacement things. We’d rather “do something” than “have something”. But even so, when birthdays, anniversaries and Christmas rolled around, we got more stuff. So I asked all of my friends and relatives to do something for me.   I ask folks that want to give me a gift (for whatever reason) to donate the price they would have paid for the gift to a charity they care about. This does a few things: They have to find a charity to care about The fact that I made it through a calendar year now actually means something Someone else gets the help they need Everybody feels better No, I’m not saying these things so you’ll think I’m a wonderful person - the reason I’m posting this here is that as a technical professional you probably have enough stuff like I do. So I ask you to try this out. Try it for one birthday, or one Holiday, or even for a year. I can promise this: it will change your life, the life of the person who gives the gift, and the person’s life who receives it. If you do try it, I’d love to have a comment here on your thoughts.

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  • MVC 2 Ajax.Beginform passes returned Html + Json to javascript function

    - by Joe
    Hi, I have a small partial Create Person form in a page above a table of results. I want to be able to post the form to the server, which I can do no problem with ajax.Beginform. <% using (Ajax.BeginForm("Create", new AjaxOptions { OnComplete = "ProcessResponse" })) {%> <fieldset> <legend>Fields</legend> <div class="editor-label"> <%=Html.LabelFor(model => model.FirstName)%> </div> <div class="editor-field"> <%=Html.TextBoxFor(model => model.FirstName)%> <%=Html.ValidationMessageFor(model => model.FirstName)%> </div> <div class="editor-label"> <%=Html.LabelFor(model => model.LastName)%> </div> <div class="editor-field"> <%=Html.TextBoxFor(model => model.LastName)%> <%=Html.ValidationMessageFor(model => model.LastName)%> </div> <p> <input type="submit" /> </p> </fieldset> <% } %> Then in my controller I want to be able to post back a partial which is just a table row if the create is successful and append it to the table, which I can do easily with jquery. $('#personTable tr:last').after(data); However, if server validation fails I want to pass back my partial create person form with the validation errors and replace the existing Create Person form. I have tried returning a Json array Controller: return Json(new { Success = true, Html= this.RenderViewToString("PersonSubform",person) }); Javascript: var json_data = response.get_response().get_object(); with a pass/fail flag and the partial rendered as a string using the solition below but that doesnt render the mvc validation controls when the form fails. SO RenderPartialToString So, is there any way I can hand my javascript the out of the box PartialView("PersonForm") as its returned from my ajax.form? Can I pass some addition info as a Json array so I can tell if its pass or fail and maybe add a message? UPDATE I can now pass the HTML of a PartialView to my javascript but I need to pass some additional data pairs like ServerValidation : true/false and ActionMessage : "you have just created a Person Bill". Ideally I would pass a Json array rather than hidden fields in my partial. function ProcessResponse(response) { var html = response.get_data(); $("#campaignSubform").html(html); } Many thanks in advance

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  • How to make transition from one-man to small team successfull

    - by si2w
    I have started a big project 1 1/2 ago. It's time to have some help to face the future challenges. Actually I'm the engineer, the architect, the dba, the sysadmin etc... The transistion is not so simple and it's difficult to find the good person. When we will find this person, what's the best ways to manage him/her to give enough freedom to be happy and productive but have a clean, fast, reuseable, working, ... code ? Is there good books you advice ? Thanks !

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  • Is ignoring clients data during an automatic upgrading acceptable?

    - by A competent translator
    I recently faced a deletion of my calendar and notes data inside a third party application ( Horde ) on my online space. When I told the web hosting provider they replied that they were doing an upgrade to system software (!!) and client third party applications are not within their reach or backup policy. They don't even have a backup of my data. Is this practice acceptable from a web hosting provider, even for an individual clients ? I know that backing up my data is my responsibility but I anticipated that backup copies done by the host would be available when needed.

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  • Jobs asking for web design and development skills, should it be doubling the pay? [closed]

    - by Andy
    Should you demand twice as much money if the job's asking for two different sets of skills such as graphic design and computer programming? Sure you won't be doing 16 hours of work a day, but we all know that so much of the time is spent on communication between designers and developers, and if the designer and the developer is the same person, it would take way less time, and hence I think the pay should be doubled. If not double, how much more should you ask for? How much are employers usually willing to pay for such a polymath position? If you are hiring, would you prefer one polymath person or two specialists at the same cost?

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  • Is it bad SEO to embed an img tag in the middle of a sentence?

    - by Offlein
    I recently received a web mockup that included a sidebar with a short paragraph of narrow text; a quote from a person. At the end of the quote, the mockup had a circular portrait of the person floated to the right, hanging off the edge of the block, with the text flowing around the edge of it. It looked like this, where "TEXT" is the text, and "o" is the portrait TEXTTEXTTEXTTEXTTEX TEXTTEXTTEXTTE TEXTTEXTTEXT ooooo TEXTTEXTTEXT ooooooo TEXTTEXTTEXT ooooooo ooooo The easiest way to do this would be to put the tag for the portrait somewhere in the markup of the text, and float it right. But the HTML will look like, in that case: TEXTTEXTTE<img src="..." style="float: right;">XTTEXTTEXT and I fear this would be bad for SEO. Does anyone know? The other option is putting the at the end, absolutely positioning it, and using manual line breaks -- which sucks for my responsive design.

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  • How do I get around this lambda expression outer variable issue?

    - by panamack
    I'm playing with PropertyDescriptor and ICustomTypeDescriptor (still) trying to bind a WPF DataGrid to an object, for which the data is stored in a Dictionary. Since if you pass WPF DataGrid a list of Dictionary objects it will auto generate columns based on the public properties of a dictionary (Comparer, Count, Keys and Values) my Person subclasses Dictionary and implements ICustomTypeDescriptor. ICustomTypeDescriptor defines a GetProperties method which returns a PropertyDescriptorCollection. PropertyDescriptor is abstract so you have to subclass it, I figured I'd have a constructor that took Func and an Action parameters that delegate the getting and setting of the values in the dictionary. I then create a PersonPropertyDescriptor for each Key in the dictionary like this: foreach (string s in this.Keys) { var descriptor = new PersonPropertyDescriptor( s, new Func<object>(() => { return this[s]; }), new Action<object>(o => { this[s] = o; })); propList.Add(descriptor); } The problem is that each property get's its own Func and Action but they all share the outer variable s so although the DataGrid autogenerates columns for "ID","FirstName","LastName", "Age", "Gender" they all get and set against "Gender" which is the final resting value of s in the foreach loop. How can I ensure that each delegate uses the desired dictionary Key, i.e. the value of s at the time the Func/Action is instantiated? Much obliged. Here's the rest of my idea, I'm just experimenting here these are not 'real' classes... // DataGrid binds to a People instance public class People : List<Person> { public People() { this.Add(new Person()); } } public class Person : Dictionary<string, object>, ICustomTypeDescriptor { private static PropertyDescriptorCollection descriptors; public Person() { this["ID"] = "201203"; this["FirstName"] = "Bud"; this["LastName"] = "Tree"; this["Age"] = 99; this["Gender"] = "M"; } //... other ICustomTypeDescriptor members... public PropertyDescriptorCollection GetProperties() { if (descriptors == null) { var propList = new List<PropertyDescriptor>(); foreach (string s in this.Keys) { var descriptor = new PersonPropertyDescriptor( s, new Func<object>(() => { return this[s]; }), new Action<object>(o => { this[s] = o; })); propList.Add(descriptor); } descriptors = new PropertyDescriptorCollection(propList.ToArray()); } return descriptors; } //... other other ICustomTypeDescriptor members... } public class PersonPropertyDescriptor : PropertyDescriptor { private Func<object> getFunc; private Action<object> setAction; public PersonPropertyDescriptor(string name, Func<object> getFunc, Action<object> setAction) : base(name, null) { this.getFunc = getFunc; this.setAction = setAction; } // other ... PropertyDescriptor members... public override object GetValue(object component) { return getFunc(); } public override void SetValue(object component, object value) { setAction(value); } }

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  • Can exim be configured to send all emails externally?

    - by Tom Brossman
    How do I configure exim4 to route all emails via a third-party SMTP server when the sender's domain, recipient's domain, and server hostname all match? I followed this great answer and have exim4 sending emails to addresses at other domains tested and working from an Ubuntu server. My only issue is that emails where both the sender and recipient share the same domain as the server hostname, they never leave the server (and this is the expected behavior). For example, sending from [email protected] -- [email protected] works fine, but sending from [email protected] -- [email protected] just routes the mail locally to /var/mail/account2, without passing through the third-party SMTP server. I'm using Google Apps at my own domain and want to send emails from [email protected] to [email protected] from a machine with the hostname example.com. I want to route them through Google's SMTP server so I see them in my other email clients. Is this possible? Very similar questions (but for postfix) here and here.

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  • Why can't I view a specific websites?

    - by user79263
    I am a netwrok administrator at a small company (22 PC) and i have a problem, and i don't know which could be the cause. I can't access a specific website from the LAN. I have a server which has 2 NICs(one to ISP and one to LAN). I have installed on the server (Bind DNS server and DHCP server) Debian 6 Server. I want to mention that "nslookup mcel.co.mz", and "dig my_site" is not working perfectly, I can't access the site from inside the LAN. I can't send emails to person that are located in that domain. When I dig mcel.co.mz @8.8.8.8 the domain is resolved. Why can't I view a specific websites? www.mcel.co.mz Why can't send email to person that are on some domains? @mcel.co.mz I don't have any rule configured in Debian Server which wouldn't let me acces the site. I am the only one responsable with the IT department. Lowly,

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