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• Why appending to a list in Scala should have O(n) time complexity?

  - by Jubbat

  I am learning Scala at the moment and I just read that the execution time of the append operation for a list (:+) grows linearly with the size of the list. Appending to a list seems like a pretty common operation. Why should the idiomatic way to do this be prepending the components and then reversing the list? It can't also be a design failure as implementation could be changed at any point. From my point of view, both prepending and appending should be O(1). Is there any legitimate reason for this?

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• Is there a way to emulate pinch-zoom?

  - by aking1012

  I'm looking for a way to emulate pinch zoom in either an android emulator(android SDK-less desirable) or a (preferred) native Ubuntu web browser that I can resize to a specified size for initial testing of HTML5 applications. This is would be useful for first round testing during cross-platform application development. Note: I'm trying to do this with no real touch-device only a mouse. So the best answer would be something like "Install this chromium plug-in and use this hotkey to set pinch points" or something similar. We already have this for getting dual mouse working(thanks AmithKK). The browser that supports multi-touch is the hard part. Something to note is that I start getting screen artifacts using multiple mice via that guide. They're mild and tolerable, but they are there.

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• What factors influence you to try out a new framework or tool?

  - by VirtuosiMedia

  I'm in the process of putting the final touches on an open-source framework that I hope to release in the next few months. It's something that I'd like to develop a community for and so I'm curious about what factors influence your decision to use a new framework or tool and why. Some of the specific things I'd like to know more about (feel free to add to this): Types of documentation/tutorials/instruction Community support (comments/forum) Updates (blog/social media/feeds) Look and feel of the project website design White papers/testimonials A big feature list Community size Tools Ability to contribute Project test coverage (stability/security) Level of buzz (recommended by friends or around the web) Convincing marketing copy Ideally, I'd like to have all of the above, but what specific features/qualities will carry greater weight in getting programmers to adopt something new? What says, 'This is a professional-grade project,' and what are red flags that keep you from trying it out?

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• Infinite terrain shadows

  - by user35399

  I'm creating an infinite terrain engine, which generates the terrain either with fractals or noise. How can I make dynamic shadows for the sun on this terrain, if I don't know in advance what will be rendered in front of the sun. My terrain: The sun is the only light, it is directional, my terrain is generated on a plane which is positioned before the camera, frustum culled and fits the size of the viewing frustum. It is height mapped with generated noise texture, and using tessellation shaders on it. Video:http://www.youtube.com/watch?v=tk6yFwYusOs Dynamic shadows with the infinite terrain.

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• Resize images to specific height value in ImageMagick?

  - by Jason

  I've looked around for this, and can't find an easily implemented solution. Currently I'm working on an application that deals with panoramas. As they come out of the batch stitch process, the dimensions average 18000x4000. Using ImageMagick, how can I downscale those images to a specific height value while maintaining aspect ratio? According to the manual, the convert operation takes in both height and width to resize to while maintaining the same aspect ratio. What I'd like is to put in 600 and 1000 in my existing resize script function and have both a regular viewable image as well as a reduced size.

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• Largest successful JavaScript project? [closed]

  - by 80x24 console

  A common theme in the GWT community is "I wouldn't want to build a project of THAT size using a pure JavaScript library!" What is the largest project that you have successfully delivered with frontend functionality written in JavaScript? (not Java or GWT) Please provide at least a hand-wavy SLOC estimate of the unique JS code (not including libraries, frameworks, toolkits, test code, generated code, server-side processing such as PHP, etc.) that was in the finished product. Note to GWT advocates: Please read the question carefully before answering. I've heard plenty of stories about JS failures and GWT successes, but I'd like to hear some quantified JS successes. Note to mods: This is primarily a business-of-software question, not a tools question. It factors into a real-world business decision.

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• Google I/O 2012 - Gaming in the Cloud

  Google I/O 2012 - Gaming in the Cloud "Fred Sauer Many games developers are finding the easy development and deployment experience of Google App Engine ideal for building cloud based state-storage, matching making services and collaborations services. When you have a hit game, the last thing you want to do is worry about your server provisioning. App Engine has an always-free tier to get you started and then scales seamlessly to any size of usage. Game developers also use Google Cloud Storage to easily store and quickly deliver media files to clients around the world. For all I/O 2012 sessions, go to developers.google.com From: GoogleDevelopers Views: 1 0 ratings Time: 01:02:17 More in Science & Technology

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• New Exadata and Exalogic public references

  - by Javier Puerta

  The following are new public references for Exadata and Exalogic: Allegis Accelerates HR Processing for 130,000 Contractors  Oracle customer, Allegis, describes how Oracle Exadata and Oracle Exalogic helped consolidate and optimize critical processes running in Oracle's PeopleSoft.  Hyundai Motor Company Document Cuts Repository Management and Access Times Approximately 85%, Saves More Than US$1 Million in Yearly Printing and Paper Costs The company implemented Oracle Exalogic Elastic Cloud, Oracle Exadata Database Machine, Oracle WebLogic, and Oracle WebCenter Content 11g to ensure high performance and stability for its new document-centralization system  University of Minnesota Reduces Data Center Footprint while Enhancing Performance and Manageability with Oracle Exadata Database Machine   Leading Research Institution Consolidates More Than 200 Databases to Approximately 20 while Maximizing Availability for Thousands of Users SThree Prepares to Triple in Size with a Cloud-Based Architecture and a Consolidated, Stable, and Scalable Global Platform  By consolidating 68 databases into a single Oracle Exadata Database Machine, SThree achieved the stability and scalability it needed to support its growth targets. Further enhancements to the organization’s core systems include a planned upgrade for Siebel Contact Center and improved integration with Oracle Fusion Middleware.

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• Bridge made out of blocks at an angle

  - by Pozzuh

  I'm having a bit of trouble with the math behind my project. I want the player to be able to select 2 points (vectors). With these 2 points a floor should be created. When these points are parallel to the x-axis it's easy, just calculate the amount of blocks needed by a simple division, loop through that amount (in x and y) and keep increasing the coordinate by the size of that block. The trouble starts when the 2 vectors aren't parallel to an axis, for example at an angle of 45 degrees. How do I handle the math behind this? If I wasn't completely clear, I made this awesome drawing in paint to demonstrate what I want to achieve. The 2 red dots would be the player selected locations. (The blocks indeed aren't square.) http://i.imgur.com/pzhFMEs.png.

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• Font displays differently in Firefox vs. Chrome

  - by Goro

  It seems that my menu bar is displayed with a different font stretch in Firefox than it is in Chrome. See the following: Here is the CSS applied to this element: font-variant: small-caps; font-size:13px; letter-spacing: 0px; font-family: Arial; font-stretch: normal; text-decoration: none; As far as I can tell everything regarding that font is exactly the same, yet they still display differently (see pic). Any ideas? Thanks,

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• Why is my content database so large?

  - by PeterBrunone

  If your SharePoint site collection hasn't grown, but your content database has, the most likely culprit is versioning.  If a list -- or worse, a library -- has versioning enabled, the default is to keep every single one.  That means that every time someone edits and checks in a document, its storage footprint increases by the size of the document (and probably a little more).The solution?  It could be a bit painful, but you'll need to go back into each library and restrict the number of versions to keep (three is sufficient for most uses, but your needs may vary).  I suggest keeping only major versions as well, since minor versions are really just stopping points on the way to a published document.Of course if you have a real business need to keep all those versions around, then you'll want to look into an archiving solution that will take the old versions out of the content database but still make them available if necessary.

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• Efficient way to check for changes to the contents of folders

  - by MrVimes

  I am creating an application that maintains a database of files of a certain type in a given folder (and all subfolders) Initially the program will recurse the folders and add any file it finds of that type to the database. I want the application to have the ability to re-scan the folder and add any files that were not there the last time the folders were scanned. It can't use the date created property of the file because there is a high chance of a file being added to the folders that isn't a new file. I am wondering what the most efficient way of doing this is, and if there is a way that doesn't involve checking each file is in the database already (which, if there are 5000 files would mean 5000 queries of a list 5000 items in size, or 25 million 'checks' for the sql engine to perform) I suppose a more specific question to acheive the same goal would be - is there a property of a file (in Microsoft Windows) that will reliably tell you when that file arrived in that folder.

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• U1 music shows unknown artist, how can I make it recognize m4a files?

  - by bisi

  Hello all, I am in the process of uploading my music library as a backup to U1, but I figured, why not also enjoy Ubuntu 1 music on my iPhone? With a few difficulties to start, the upload is now in progress, but I've noticed that there is a huge percentage of files in the unknown artist folder, and I believe it is all of my m4a files. They play fine, but without any information. Coming from an iTunes background, and having bought the majority of my music on the iTunes store, I wonder how I could make this work, easily? I am on Maverick (afaik), but About Ubuntu shows 11.04. I use Banshee as my music manager, and I monitor my sync using Ubuntu one preferences, ubuntuone-indicator and magicicada. The total file size of my music folder is 38.9GB. Thank you for your help!! And apologies if I couldn't find a thread where this was already covered...

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• How to handle loading and keeping many bitmaps in an Android 2D game

  - by Lumis

  In an Android 2D game which is using SurfaceView where its onDraw is driven by a loop from a Thread, I use many bitmap sprites (sprite sheets) and two background size bitmaps, which are all loaded into memory at the start. It all works fine, however, when the activity is onPause or after reloading it few times, Android shows a tendency to wipe out the big bitmaps only, probably to free memory. Sometimes this happens even in the middle of loading this very activity. In order to counter this, I made a check in the onDraw method to test if the big bitmaps are still there and reload them if they are forcefully recycled by Android, before drawing them on Canvas. This solution may not be the most stable, and since I know that there are much more accomplished android game programmers here than myself, I hope you can reveal some tricks or secrets or at least provide some good hints, how to overcome this.

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• What algorithms would suit image colour summarization? [on hold]

  - by codecowboy

  I would like to analyse a set of hundreds of thousands of product images (clothing, electronic goods etc) and retrieve the dominant colours in each. I'm only interested in the top 3 or 4 colours. The aim is to achieve a degree of certainty that x image is mostly red or image y is mostly orange and blue. The images are likely to be colour jpegs of reasonable quality and approximately 100kb in size. I would like to use C# and the solution should run on a Linux server, preferably using open source libraries. What image processing algorithms or techniques might help me achieve this?

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• Why are my file selection dialogs so big? How do I make them smaller?

  - by Amanda

  When I use an external monitor, my file selection dialog boxes seem to be huge -- wider than my larger screen. I assume it is a nautilus issue since it happens whether I'm trying to open a file to upload (in firefox) or attach (in thunderbird) or just open it in LibreOffice. See screenshot: The browser window fills my left-hand monitor, the "open" dialog is wider than one screen, and wider than the window that spawned it. It's huge. It didn't used to be huge. Is there some way to force dialog windows to be smaller by default? Whenever I try to open/attach/upload a file I have to re-size the finder dialog before I can see what I'm looking at. I don't understand why it is defaulting to such a huge window.

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• Does SEO optimisation count on the responsive side of a site?

  - by Rick Donohoe

  I'm looking at making some SEO optimisation fixes, and at this point I'm sorting out the heading structure and keywords - H1's, H2's etc We have a site where there are a number of similar blocks, and one is always visible, and one is hidden depending on the screen size. This is our method of making a single site responsive. Firstly, how does this technique affect the SEO, and in general does the responsive side of a site matter at all to search engines? What I mean by this is if the site has different content depending on screen sizes, then which content would the search spider crawl?

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• Lakeside Sunset in the Mountains [Wallpaper]

  - by Asian Angel

  Note: Original image size is 5808*3786 pixels and 13.76 MB when downloaded. Sunset-HDR [DesktopNexus] Latest Features How-To Geek ETC Macs Don’t Make You Creative! So Why Do Artists Really Love Apple? MacX DVD Ripper Pro is Free for How-To Geek Readers (Time Limited!) HTG Explains: What’s a Solid State Drive and What Do I Need to Know? How to Get Amazing Color from Photos in Photoshop, GIMP, and Paint.NET Learn To Adjust Contrast Like a Pro in Photoshop, GIMP, and Paint.NET Have You Ever Wondered How Your Operating System Got Its Name? Lakeside Sunset in the Mountains [Wallpaper] Taskbar Meters Turn Your Taskbar into a System Resource Monitor Create Shortcuts for Your Favorite or Most Used Folders in Ubuntu Create Custom Sized Thumbnail Images with Simple Image Resizer [Cross-Platform] Etch a Circuit Board using a Simple Homemade Mixture Sync Blocker Stops iTunes from Automatically Syncing

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• CSS3 - "connecting" 2 classes animation [closed]

  - by Nave Tseva

  I have this CSS +HTML code: <!DOCTYPE HTML> <html> <head> <meta http-equiv="content-type" content="text/html; charset=UTF-8" /> <title>What</title> <style type="text/css"> #page { width: 900px; padding: 0px; margin: 0 auto; direction: rtl; position: relative; } #box1 { position: relative; width: 500px; border: 1px solid black; box-shadow: -3px 8px 34px #808080; border-radius: 20px; box-shadow: -8px 5px 5px #888888; right: 300px; top: 250px; height: 150px; -webkit-transition: all 1s; font-size: large; color: Black; padding: 10px; background: #D0D0D0; opacity: 0; } @-webkit-keyframes myFirst { 0% { right: 300px; top: 150px; background: #D0D0D0; opacity: 0; } 100% { background: #909090; ; right: 300px; top: 200px; opacity: 1; } } #littlebox1 { top: 200px; position: absolute; display: inline-block; } .littlebox1-sentence { font-size: large; padding-bottom: 15px; padding-top: 15px; padding-left: 25px; padding-right: 10px; background: #D0D0D0; border-radius: 10px; -webkit-transition: background .25s ease-in-out; } #littlebox1:hover ~ #box1 { -webkit-transition: all 0s; background: #909090;; right: 300px; top: 200px; -webkit-animation: myFirst 1s; -webkit-animation-fill-mode: initial; opacity: 1; } .littlebox1-sentence:hover { background: #909090; } .littlebox1-sentence:hover + .triangle { border-right: 50px solid #909090; } .triangle { position: relative; width: 0; height: 0; border-right: 50px solid #D0D0D0; border-top: 24px solid transparent; border-bottom: 24px solid transparent; right: 160px; -webkit-transition: border-right .25s ease-in-out; } .triangle:hover { border-right:50px solid #909090; } </style> <script src="//ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js"></script> <script> $(function() { $('.littlebox1-sentence').hover(function() { $(this).css('background', '#909090'); $('.triangle').css('border-right', '50px solid #909090'); }); </script> <script> $(function() { $('.triangle').hover(function() { $(this).css('border-right', '50px solid #909090'); $('.littlebox1-sentence').css('background', '#909090'); }); </script> </head> <body dir="rtl"> <div id="page"> <div id="littlebox1" class="littlebox1-sentence">put your mouse here</div><div id="littlebox1" class="triangle"> </div> <div id="box1"> </div> </div> </body> </html> Live example you will find here: http://jsfiddle.net/FLe4g/12/ The problem here that something here wrong in the second jquery code. I want that every time that I put the mouse on the box, or on the triangke they both will change ther color together. when I put the mouse on the box it works fine, but when I put the mouse on the triangle it don't work. Any suggestions how to fix this code?

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• How do I get the point coords of a rotated SFML shaperect?

  - by user15498

  I am trying to get collisions of bullets working, and am using SFML. I am using code to get the position of the points of the rectangle for collisions, however I think there's a way to do this without having to get points but by simply getting the points from SFML, since the shape is a rectangle and the points are stored in that way. Is there a way to do that? Through a combination of getPoint() and getGlobalBounds() maybe? While on this topic, is it better to use shapeRects or sprites? I used to only use sprites, however with the addition of textures and more low level stuff I think it would be best to switch to using rectangles and setting their size.

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• Project OpenPTK Release 2.1 Available

  - by Scott Fehrman

  The OpenPTK owners are pleased to announce that release 2.1 is available.  It has been "tagged" in the svn repository. See the download page for details.   This release is an update to version 2.0.  This release contains bug fixes, enhancements to existing capabilities, and new features.  The most notable change in this release is the use of maven, instead of ant, for the build process.  The adoption of maven has made the project more modular, reduced its download size (less bundled jar files) and will enable the future support of Project OpenPTK in a maven repository. For full details, see the OpenPTK version 2.1 Release Notes

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• Launcher icon differences in pixels between monitors usign same resolution

  - by Luis Alvarado

  Today I got to test a Samsung SyncMaster 2043nwx. My normal monitor was a 1080p Soniview TV that supports 1920x1080. I use 1680x1050 (16:10) as my common resolution. My amazed is when I see that the launcher icons looks more to a "correct size" of 32px to what they show in my Soniview where they actually take about 50% more using the same resolution. They are both the same resolution but in the Soniview the launcher icons look 50% bigger than the ones in the Samsung. My question is then, why the difference between both monitors since they are using the same resolution but are showing different launcher icon sizes.

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• 2D game big background images for maps

  - by WhiteCat

  Update: this question is general, not specific to Sprite Kit or a single language/platform. I'm toying with Sprite Kit with an idea to make a 2D side-scroller. Now the backgrounds for the maps are going to be hand-drawn and surely bigger than retina display, so the maps could span more than 1 screen in both axis. I imagine loading such a huge image could mean trouble and I don't plan to use tiling. I'm not sure how Sprite Kit splits images bigger than max texture size, if it does. I could split the images myself and use more sprites for each part of the background. What is the usual way to handle this?

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• How can I simulate a rigid body bounced from a wall in 3D world?

  - by HyperGroups

  How can I simulate a rigid sword bounced from a wall and hit the ground (like in physical world)? I want to use this for a simple animation. I can detect the figure and the size of the sword (maybe needed in doing bounce). Rotation can be controlled by quaternions/matrix/euler angles. It should turn the head and do rotations and fly to the ground. How can I simulate this physical process? Maybe what I need is an equation and some parameters? I need these data, and would combine them into my movie file, I use Mathematica to do the thing that generate the movie file(If I have the data, I can also export it into a 3DSMax script for example).

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• How to determine the right amount of up front design?

  - by Gian

  Software developers occasionally are called upon to write fairly complex bits of software under tight deadlines. Often, it seems like the quickest thing to do is to simply start coding, and solve the problems as they arise. However, this approach can come back to bite you—often costing time or money in the long run! How do we determine the right amount of up front design work? If your work environment actively discourages you from thinking about things up front, how do you handle that? How can we manage risk if we eschew up-front thinking (by choice or under duress) and figure out the problems as they arise? Does the amount of up front design depend entirely on the size or complexity of the task, or is it based on something else?

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