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• Go Big or Go Home

  - by Justin Kestelyn

  The Oracle Develop conference (#oracledevelop10), being co-located for the first time ever with JavaOne in San Francisco, is guaranteed to be the ultimate rush for developers this year. Where else can you go to learn about, interact with, and meet fellow devotees of the entire Oracle Development stack (welcome, Oracle Solaris)? This will also be the first time that the community space traditionally located at Oracle OpenWorld - and hosted by Oracle Technology Network, as always - will be present at the "developer" conference during this busy week. So, Oracle OpenWorld's loss is Oracle Develop's gain. And what a community space it will be: nearly 4,000 square feet for meeting space, contests and give-aways, consumption of various beverages, special speakers (Oracle ACEs among them, no doubt), and video-casting. The entire Oracle Technology Network crew will be on hand to "facilitate" your experience, of course. Even better, you can rub shoulders and share war stories with attendees from that "other" conference, JavaOne. (You have access to both conferences as a single package, so you may be having a conversation with yourself.) We call the whole enchilada "The Zone". As time goes on, we'll bring you more news about the activities described above, as well as OTN Night (which proves to be more raucous than ever), technical sessions and keynotes not to be missed, the unconference/open sessions, things to do at night, and more. In the meantime, stay in touch with us via Twitter or Oracle Mix.

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• Google Rolls Out a New and Compact Navigation Bar

  - by Jason Fitzpatrick

  Earlier this spring Google introduced the black navigation bar; now they’ve updated the bar to take up less space and be more useful. Although the black bar is useful in-so-far as it gives you quick access to Google services (useful, of course, only if you use those services) the new navigation bar–seen in the video above–includes an improved layout. Rather than use the bar space to spread out links which the user may or may not use the service links are now tucked into a mouse-over menu accessed by hovering on the Google logo. The majority of the space previously just taken up by links and the black bar itself is now a a search box. If you don’t already see the new interface, look for it to appear in your Google account within the next few days. Hit up the link below to read the official announcement. The Next Stage In Our Redesign [The Official Google Blog] HTG Explains: Understanding Routers, Switches, and Network Hardware How to Use Offline Files in Windows to Cache Your Networked Files Offline How to See What Web Sites Your Computer is Secretly Connecting To

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• Games Localization: Cultural Points

  - by ultan o'broin

  Great article about localization considerations, this times in the games space. Well worth checking out. It's rare to see such all-encompassing articles about localization considerations aimed at designers. That's a shame. The industry assumes all these things are known. The evidence from practice is that they're not and also need constant reinforcement. We're not in the games space in enterprise applications yet. However, there may be a role for them in the training space but also in CRM, building relationships and contacts. Beyond the obvious considerations, check out the cultural aspects of games localization too. For example, Zygna's offerings, which you might have played on Facebook: Zynga, which can lay claim to the two most popular social games on Facebook - FarmVille and CityVille - has recently localized both games for international audiences, and while CityVille has seen only localization for European languages, FarmVille has been localized for China, which involved rebuilding the game from the ground up. This localization process involved taking into account cultural considerations including changing the color palette to be brighter and increasing the size of the farm plots, to appeal to Chinese aesthetics and cultural experience. All the more reason to conduct research in your target markets, worldwide.

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• No "Choose OS" screen after co-installation of Ubuntu 12.04

  - by Léon McGregor

  I don't have any technical knowledge of Ubuntu but wanted to install it on a partition. Step-by-step of what i did. used disk management in windows 7 to clear 50gb of space used a usb live ubuntu 12.04 installer in custom install mode used the installer's built in disk manager to set up 2gb swap space and 48gb ext4 space ran installation, with option to copy over documents and settings from windows 7 restarted after completion. After this, my computer automatically loads ubuntu 12 and skips the option to load windows 7. i know the files are still there, as i can see them in the file manager. When trying to fix with the win7 installer dvd it tries to repair the OS in drive [D:] i.e. it recognises the disc itself as the OS and ignores the [c:] files. I think, after browsing around here, similar problems suggest this is a problem with the boot loader, but if the win7 dvd won't work, then i don't have any way to fix this. does anyone know of a way to force the computer to show a "choose OS" screen?

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• nano syntax highlighting not working for all languages

  - by Dejan

  I have a funny situation where I am unable to add custom highlighting definitions to my nano text editor. The funny thing is that the predefined work like a charm and can be edited. But I have created a new one for js with $ sudo touch js.nanorc $ sudo nano js.nanorc my current js.nanorc looks like this: syntax "JavaScript" "\.js$" color blue "\<[-+]?([1-9][0-9]*|0[0-7]*|0x[0-9a-fA-F]+)([uU][lL]?|[lL][uU]?)?\>" color blue "\<[-+]?([0-9]+\.[0-9]*|[0-9]*\.[0-9]+)([EePp][+-]?[0-9]+)?[fFlL]?" color blue "\<[-+]?([0-9]+[EePp][+-]?[0-9]+)[fFlL]?" color brightblue "[A-Za-z_][A-Za-z0-9_]*[[:space:]]*[(]" color black "[(]" color cyan "\<(break|case|catch|continue|default|delete|do|else|finally)\>" color cyan "\<(for|function|get|if|in|instanceof|new|return|set|switch)\>" color cyan "\<(switch|this|throw|try|typeof|var|void|while|with)\>" color cyan "\<(null|undefined|NaN)\>" color brightcyan "\<(true|false)\>" color green "\<(Array|Boolean|Date|Enumerator|Error|Function|Math)\>" color green "\<(Number|Object|RegExp|String)\>" color red "[-+/*=<>!~%?:&|]" color magenta "/[^*]([^/]|(\\/))*[^\\]/[gim]*" color yellow ""(\\.|[^"])*"|'(\\.|[^'])*'" color magenta "\\[0-7][0-7]?[0-7]?|\\x[0-9a-fA-F]+|\\[bfnrt'"\?\\]" color brightblack "(^|[[:space:]])//.*" color brightblack start="/\*" end="\*/" color brightwhite,cyan "TODO:?" color ,green "[[:space:]]+$" color ,red " +" If anyone can see the problem then please tel me

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• VirtualBox : increase hard disk size of the virtual machine

  - by wim

  I have run out of space on my WinXP virtual machine, which I only gave 10 GB space for when I created it. Is there an easy way to increase it to, say, 20 GB? I can't see any obvious option in VirtualBox settings. edit: the suggestion below gives this error wim@wim-ubuntu:/media/data/winxp_vm$ VBoxManage modifyhd wim.vdi --resize 20000 VBoxManage: error: Cannot register the hard disk '/media/data/winxp_vm/wim.vdi' {46284957-2c09-4e70-8a49-bfbe0f7f681d} because a hard disk '/home/wim/VirtualBox VMs/winxp_vm/wim.vdi' with UUID {46284957-2c09-4e70-8a49-bfbe0f7f681d} already exists VBoxManage: error: Details: code NS_ERROR_INVALID_ARG (0x80070057), component VirtualBox, interface IVirtualBox, callee nsISupports Context: "OpenMedium(Bstr(pszFilenameOrUuid).raw(), enmDevType, AccessMode_ReadWrite, fForceNewUuidOnOpen, pMedium.asOutParam())" at line 210 of file VBoxManageDisk.cpp edit2: removing the .vdi from VirtualBox before calling VBoxManage command, then adding it back in, was successful. But now I can't boot the virtual machine, I get this worrying screen: By the way, it says FATAL: Could not read from the boot medium! System halted. edit3: The vdi must be reattached to the VM after VBoxManage command. Further, the partition will need to be resized from WITHIN windows, because you will have this empty space: I was able to resize the partition easily using a bit of freeware called EASEUS Partition Master 9.1.0 Home Edition.

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• Xna Equivalent of Viewport.Unproject in a draw call as a matrix transformation

  - by Nick Crowther

  I am making a 2D sidescroller and I would like to draw my sprite to world space instead of client space so I do not have to lock it to the center of the screen and when the camera stops the sprite will walk off screen instead of being stuck at the center. In order to do this I wanted to make a transformation matrix that goes in my draw call. I have seen something like this: http://stackoverflow.com/questions/3570192/xna-viewport-projection-and-spritebatch I have seen Matrix.CreateOrthographic() used to go from Worldspace to client space but, how would I go about using it to go from clientspace to worldspace? I was going to try putting my returns from the viewport.unproject method I have into a scale matrix such as: blah = Matrix.CreateScale(unproject.X,unproject.Y,0); however, that doesn't seem to work correctly. Here is what I'm calling in my draw method(where X is the coordinate my camera should follow): Vector3 test = screentoworld(X, graphics); var clienttoworld = Matrix.CreateScale(test.X,test.Y, 0); animationPlayer.Draw(theSpriteBatch, new Vector2(X.X,X.Y),false,false,0,Color.White,new Vector2(1,1),clienttoworld); Here is my code in my unproject method: Vector3 screentoworld(Vector2 some, GraphicsDevice graphics): Vector2 Position =(some.X,some.Y); var project = Matrix.CreateOrthographic(5*graphicsdevice.Viewport.Width, graphicsdevice.Viewport.Height, 0, 1); var viewMatrix = Matrix.CreateLookAt( new Vector3(0, 0, -4.3f), new Vector3(X.X,X.Y,0), Vector3.Up); //I have also tried substituting (cam.Position.X,cam.Position.Y,0) in for the (0,0,-4.3f) Vector3 nearSource = new Vector3(Position, 0f); Vector3 nearPoint = graphicsdevice.Viewport.Unproject(nearSource, project, viewMatrix, Matrix.Identity); return nearPoint;

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• Coarse Collision Detection in highly dynamic environment

  - by Millianz

  I'm currently working a 3D space game with A LOT of dynamic objects that are all moving (there is pretty much no static environment). I have the collision detection and resolution working just fine, but I am now trying to optimize the collision detection (which is currently O(N^2) -- linear search). I thought about multiple options, a bounding volume hierarchy, a Binary Spatial Partitioning tree, an Octree or a Grid. I however need some help with deciding what's best for my situation. A grid seems unfeasible simply due to the space requirements and cache coherence problems. Since everything is so dynamic however, it seems to be that trees aren't ideal either, since they would have to be completely rebuilt every frame. I must admit I never implemented a physics engine that required spatial partitioning, do I indeed need to rebuild the tree every frame (assuming that everything is constantly moving) or can I update the trees after integrating? Advice is much appreciated - to give some more background: You're flying a space ship in an asteroid field, and there are lots and lots of asteroids and some enemy ships, all of which shoot bullets. EDIT: I came across the "Sweep an Prune" algorithm, which seems like the right thing for my purposes. It appears like the right mixture of fast building of the data structures involved and detailed enough partitioning. This is the best resource I can find: http://www.codercorner.com/SAP.pdf If anyone has any suggestions whether or not I'm going in the right direction, please let me know.

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• What happens to remounted data/directories

  - by cauon

  According to suggestions in this post I am trying to improve my system to run better with a Solid State Drive. But regarding to RAMdisks and /etc/fstab usage I have some understanding problems coming up. So let's say I add the following lines to /etc/fstab tmpfs /tmp tmpfs defaults,noatime,nodiratime,mode=1777 0 0 tmpfs /var/spool tmpfs defaults,noatime,nodiratime,mode=1777 0 0 tmpfs /var/tmp tmpfs defaults,noatime,nodiratime,mode=1777 0 0 tmpfs /var/log tmpfs defaults,noatime,nodiratime,mode=0755 0 0 I know that on startup these locations should now get mounted into the RAM (hopefully). But what happens to the physical space that was mounted on those places before? Is it gone? Will it be back when I edit my /etc/fstab back to the Version without tmpfs? Will the space still be allocated on my SSD in a way that I can't use it for any other data? Sometimes it is suggested to add the following line, too: none /var/cache aufs dirs=/tmp:/var/cache=ro 0 0 What does this actually do? I noticed that /var/cache takes almost 1GB of space on my harddisk. So should i clear the directory before activating this line? (this is related to the former question) This causes me some confusions and I hope you can give me some clarifications. UPDATE I've downloaded a image with 600MB in size into /tmp that is mounted with the tmpfs settings above. Now I wanted to compare the RAM usage before and after the download. I expect the RAM usage to be increased by 600MB after the download. But the System Monitoring Tool showed me no changes at all. How can this be? Does tmpfs work other than I actually expect it to?

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• Installer doesn't display partition I want to install to

  - by Aditya

  While performing a Ubuntu 10.10 installation on my laptop, it doesn't show partitions pertaining to the PC. My PC configuration is as follows : HP Pavilion dv6 - 2020AX AMD Turion II Dual Core Mobile Processor M500 4 GB RAM OS Installed : Windows 7 500 GB Hard drive partitioned as follows : C : 227 GB (Free : 142 GB) D : 11.9 GB (Free : 1.98 GB) - Recovery F : 174 GB (Free : 18 GB) G : 50.5 GB (Free : 50.4 GB) So, I want to perform a Dual-boot installation on my PC, so that Ubuntu resides in the free disk space G:. Therefore, I started the Ubuntu 10.10 installation and select the manual partitioning feature in the installation. However, in the 'Allocate Drive Space' section of the installation, following partitions information is displayed: Partition Type Size Used /dev/sda /dev/sda1      1 MB    unknown /dev/sda2    ntfs    208 MB   unknown /dev/sda3   ntfs    244813 MB    168540 MB /dev/sda4    ntfs    255083 MB   3221 MB where /dev/sda - 500 GB So, what exactly is the problem? What is it should I do to install Ubuntu 10.10 in the G: disk space? Why are the partitions not being shown as the way they should be? Any Suggestions. Thank you for the help.

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• can't spot the error. Trying to increment

  - by Kevin Jensen Petersen

  I really can't spot the error, or the misspelling. This script should increase the variable currentTime with 1 every second, as long as i am holding the Space button down. This is Unity C#. using UnityEngine; using System.Collections; public class GameTimer : MonoBehaviour { //Timer private bool isTimeDone; public GUIText counter; public int currentTime; private bool starting; //Each message will be shown random each 20 seconds. public string[] messages; public GUIText msg; //To check if this is the end private bool end; void Update () { counter.guiText.text = currentTime.ToString(); if(Input.GetKey(KeyCode.Space)) { if(starting == false) { starting = true; } if(end == false) { if(isTimeDone) { StartCoroutine(timer()); } } else { msg.guiText.text = "You think you can do better? Press 'R' to Try again!"; if(Input.GetKeyDown(KeyCode.R)) { Application.LoadLevel(Application.loadedLevel); } } } if(!Input.GetKey(KeyCode.Space) & starting) { end = true; } } IEnumerator timer() { isTimeDone = false; yield return new WaitForSeconds(1); currentTime++; isTimeDone = true; } }

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• 3D Vector "End Point" Calculation for procedural Vector Graphics

  - by FrostFlame64

  Alright, So I need some help with some Vector Math. I've developing some game Engines that have Procedural Fractal Generation for Some Graphics, such as using Lindenmayer Systems for generating Trees and Plants. L-Systems, are drawn by using Turtle Graphics, which is a form of Vector graphics. I first created a system to draw in 2D Graphics, which works perfectly fine. But now I want to make a 3D equivalent, and I’ve run into an issue. For my 2D Version, I created a Method for quickly determining the “End Point” of a Vector-like movement. Given a starting point (X, Y), a direction (between 0 and 360 degrees), and a distance, the end point is calculated by these formulas: newX = startX + distance * Sin((PI * direction) / 180) newY = startY + distance * Cos((PI * direction) / 180) Now I need something Similarly Equivalent for performing this Calculation in 3D, But I haven’t been able to Google anything that could show me how to do this. I'm flexible enough to get whatever required information is needed for this method calculation, in any reasonable form (Vector3, Quaternion, ect). To summarize: Given a starting point/vector position in 3D space (X, Y, Z), a Direction in 3D space (Vector3, Quaternion, ect), and a Distance, I need to find the “End Point” in 3D Space. Thank you for your time and help.

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• Videos: Getting Started with Java Embedded

  - by Tori Wieldt

  Are you a Java developer? That means you can write applications for embedded processors! There are new six new videos up on the YouTube/Java channel that you can watch to get more information. To get an overview, watch James Allen of Oracle Global Business Development give OTN a tour of the Oracle booth at ARM Techcon. He also explains the huge opportunity for Java in the embedded space. These videos from Oracle Engineering show you how to leverage your knowledge to seamlessly develop in a space that is really taking off. Java SE Embedded Development Made Easy, Part 1 This video demonstrates how developers already familiar with the Java SE development paradigm can leverage their knowledge to seamlessly develop on very capable embedded processors. Part one of a two-part series. Java SE Embedded Development Made Easy, Part 2 This video demonstrates how developers already familiar with the Java SE development paradigm can leverage their knowledge to seamlessly develop on very capable embedded processors. Part two of a two-part series. Mobile Database Synchronization - Healthcare Demonstration This video demonstrates how a good portion of Oracle's embedded technologies (Java SE-Embedded, Berkeley DB, Database Mobile Server) can be applied to a medical application. Tomcat Micro Cluster See how multiple embedded devices installed with Java Standard Edition HotSpot for Armv5/Linux and Apache Tomcat can be configured as a micro cluster. Java Embedded Partnerships Kevin Smith of Oracle Technical Business Development explains what's new for partners and Java developers in the embedded space. Learn how you can start prototyping for Qualcomm's new Orion board before it's available. (Sorry about the video quality, the booth lights were weird.)   Visit the YouTube/Java channel for other great Java videos. <fade to black>

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• What is the safest way to remove a swap partition?

  - by user212062

  I am running Ubuntu 12.04 on a 64-bit HP laptop with a 16 GB flash drive. I do not have a working hard drive right now. When I installed Ubuntu, I created a 2 GB swap partition on sdb1. I have since learned that swap partitions are generally a bad idea on flash drives, so I would like to use my swap space for my other partitions. You can see my partition scheme in the link below. I have read that I just have to comment sdb1 out of the fstab file, boot from a GParted live CD, select swapoff for sdb1, delete/merge with other partition, and everything's good. But, I've also read that messing with sdb1 can change the UUID of sdb2 or sdb3 and cause problems. Is this true? Does initramfs use swap at all? Also, when I get Ubuntu running on my laptop with an internal hard drive, does the swap partition help that much? I have 6 GB of DDR3. Does the rule of 1.5xActual RAM still apply? It seems like quite a bit to me. Thanks for the help! UPDATE: I have removed swap. The process I followed is: Right click swap partition in GParted and selected swapoff. Used # to comment the swap partition out of fstab. I tried to boot from a live GParted CD, but I kept getting an error, so I ran GParted in Ubuntu. Deleted swap partition in GParted. Unmounted /windows. Expanded /windows to take the remaining space. Mounted /windows. The / and /windows partitions each kept their own names and UUIDs, and everything is running fine. I have never seen any swap space being used before, and I don't intend to use the hibernate function, so I think removing swap was a good idea.

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• 3D zooming technique to maintain the relative position of an object on screen

  - by stark

  Is it possible to zoom to a certain point on screen by modifying the field of view and rotating the view of the camera as to keep that point/object in the same place on screen while zooming ? Changing the camera position is not allowed. I projected the 3D pos of the object on screen and remembered it. Then on each frame I calculate the direction to it in camera space and then I construct a rotation matrix to align this direction to Z axis (in cam space). After this, I calculate the direction from the camera to the object in world space and transform this vector with the matrix I obtained earlier and then use this final vector as the camera's new direction. And it's actually "kinda working", the problem is that it is more/less off than the camera's rotation before starting to zoom depending on the area you are trying to zoom in (larger error on edges/corners). It looks acceptable, but I'm not settling for only this. Any suggestions/resources for doing this technique perfectly? If some of you want to explain the math in detail, be my guest, I can understand these things well.

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• Rendering a big game universe - bitmaps or vector graphics?

  - by user1641923

  I am new to an Android development, though I have much experience with Java, C++, PHP programming and a bit experience with vector graphics too (basic 3d Studio Max, Flash, etc). I am starting to work on an Android game. It is going to be a 2D space shooter/RPG, and I am not going to use any game engines and any 3D party libs. I really want to create a very large game universe, or even pseudo-infinite (without visible borders, as if it were a 2D projection of a sphere). It should include 10-12 clusters of 7-8 planets/other space objects and random amount of single asteroids/comets, which player can interact with and also not interactive background. I am looking for a least complicated aproach to create such a universe. My current ideas are: Simply create bitmaps with space scenery background so that they can be tiled seamlessly repeated and construct my 2D universe of this tiles, then place interactive objects (planets, other spaceships) on it. Using vector graphics. I would have a solid color background, some random background objects and gradients here and there. My problems here: Lack of knowledge of how well vector graphics is integrated in Android. Performance? Memory usage? Does Android manage big bitmaps well? Do all of the bitmaps have to be in memory during all game process? I am interested in technical details regarding each of the ideas and a suggestion, which I should go with.

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• How to view/mount other partitions on your hard drive

  - by Preston Zacharias

  Recently I have installed Ubuntu 12.04 Beta 2 on a USB flash drive and decided to install it on an old external HDD which I have taken out of the casing and succesfully mounted in my desktop computer. There is no other operating system besides the newly install Ubuntu. However, there is about 500gb of data on the drive. This is why i used a partitioning software on my windows 7 netbook to partition the hard drive to set aside 1tb for files, 350gb of space for linux and the remaining 650gb for Vista which i plan on installing soon. But this is where the problem sets in...when installing Ubuntu it does not recognize that the drive is partitioned at all, it's just one big open block of space...so I used the installers built in partitioning feature to set aside 300gb for main Ubuntu install and 50gb for swap space. I set both of these partitions to be created at the "end" so that it wouldn't delete or write over my data. And this is where i am really lost; when booting into Ubuntu i am able to use it perfectly fine, got on internet, etc...but i have NO CLUE as to how i can view files that were previously on the drive (all of my data that i had prior to install). How can I mount/be able to view the other partition so that i can have access to my data? Thank you ahead of time! I REALLY appreciate any help or advice! ~Preston

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• Is there an excuse for short variable names?

  - by KChaloux

  This has become a large frustration with the codebase I'm currently working in; many of our variable names are short and undescriptive. I'm the only developer left on the project, and there isn't documentation as to what most of them do, so I have to spend extra time tracking down what they represent. For example, I was reading over some code that updates the definition of an optical surface. The variables set at the start were as follows: double dR, dCV, dK, dDin, dDout, dRin, dRout dR = Convert.ToDouble(_tblAsphere.Rows[0].ItemArray.GetValue(1)); dCV = convert.ToDouble(_tblAsphere.Rows[1].ItemArray.GetValue(1)); ... and so on Maybe it's just me, but it told me essentially nothing about what they represented, which made understanding the code further down difficult. All I knew was that it was a variable parsed out specific row from a specific table, somewhere. After some searching, I found out what they meant: dR = radius dCV = curvature dK = conic constant dDin = inner aperture dDout = outer aperture dRin = inner radius dRout = outer radius I renamed them to essentially what I have up there. It lengthens some lines, but I feel like that's a fair trade off. This kind of naming scheme is used throughout a lot of the code however. I'm not sure if it's an artifact from developers who learned by working with older systems, or if there's a deeper reason behind it. Is there a good reason to name variables this way, or am I justified in updating them to more descriptive names as I come across them?

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• Is there an excuse for excessively short variable names?

  - by KChaloux

  This has become a large frustration with the codebase I'm currently working in; many of our variable names are short and undescriptive. I'm the only developer left on the project, and there isn't documentation as to what most of them do, so I have to spend extra time tracking down what they represent. For example, I was reading over some code that updates the definition of an optical surface. The variables set at the start were as follows: double dR, dCV, dK, dDin, dDout, dRin, dRout dR = Convert.ToDouble(_tblAsphere.Rows[0].ItemArray.GetValue(1)); dCV = convert.ToDouble(_tblAsphere.Rows[1].ItemArray.GetValue(1)); ... and so on Maybe it's just me, but it told me essentially nothing about what they represented, which made understanding the code further down difficult. All I knew was that it was a variable parsed out specific row from a specific table, somewhere. After some searching, I found out what they meant: dR = radius dCV = curvature dK = conic constant dDin = inner aperture dDout = outer aperture dRin = inner radius dRout = outer radius I renamed them to essentially what I have up there. It lengthens some lines, but I feel like that's a fair trade off. This kind of naming scheme is used throughout a lot of the code however. I'm not sure if it's an artifact from developers who learned by working with older systems, or if there's a deeper reason behind it. Is there a good reason to name variables this way, or am I justified in updating them to more descriptive names as I come across them?

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• Zoom Layer centered on a Sprite

  - by clops

  I am in process of developing a small game where a space-ship travels through a layer (doh!), in some situations the spaceship comes close to an enemy space ship, and the whole layer is zoomed in on the two with the zoom level being dependent on the distance between the ship and the enemy. All of this works fine. The main question, however, is how do I keep the zoom being centered on the center point between the two space-ships and make sure that the two are not off-screen? Currently I control the zooming in the GameLayer object through the update method, here is the code (there is no layer repositioning here yet): -(void) prepareLayerZoomBetweenSpaceship{ CGPoint mainSpaceShipPosition = [mainSpaceShip position]; CGPoint enemySpaceShipPosition = [enemySpaceShip position]; float distance = powf(mainSpaceShipPosition.x - enemySpaceShipPosition.x, 2) + powf(mainSpaceShipPosition.y - enemySpaceShipPosition.y,2); distance = sqrtf(distance); /* Distance > 250 --> no zoom Distance < 100 --> maximum zoom */ float myZoomLevel = 0.5f; if(distance < 100){ //maximum zoom in myZoomLevel = 1.0f; }else if(distance > 250){ myZoomLevel = 0.5f; }else{ myZoomLevel = 1.0f - (distance-100)*0.0033f; } [self zoomTo:myZoomLevel]; } -(void) zoomTo:(float)zoom { if(zoom > 1){ zoom = 1; } // Set the scale. if(self.scale != zoom){ self.scale = zoom; } } Basically my question is: How do I zoom the layer and center it exactly between the two ships? I guess this is like a pinch zoom with two fingers!

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• Why is Desktop Unity using the global application menu?

  - by Kazade

  It was announced in another question that the desktop version of Unity will keep the global menu by default. Here are the facts: The global menu was introduced into UNE to save vertical screen space because at Netbook resolutions the vertical space is limited. On a modern desktop with a high resolution, there is ample vertical space making this unnecessary On the announcement of UNE global menus, Mark Shuttleworth himself said the following: "There are outstanding questions about the usability of a panel-hosted menu on much larger screens, where the window and the menu could be very far apart." The benefits of a global menu don't seem to carry across to a high-resolution desktop and instead seem to bring draw backs (increased mouse travel, large distance between the menu and its associated window). The other worrying factor is that applications seem to be moving away from having a menu bar, and instead of innovating on this and defining new guidelines for moving away from the menu, we are giving it prime place right at the top of the desktop. If applications continue moving away from the desktop we will have an inconsistent experience concerning where to locate application related options/tools depending on which app you are using (e.g. Chrome). Finally, the current global menu bar implementation doesn't work for all apps, and doesn't even work for all apps in the default install. This means that the default desktop implementation will be inconsistent. So, there are a bunch of reasons why moving to a global menu is a bad idea, so we need some pretty convincing arguments for why it is a good idea. What are the reasons for the global menu implementation in the desktop version of Unity?

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• Interesting 3d zooming technique

  - by stark

  Is it possible to zoom to a certain point on screen by modifying the field of view and rotating the camera as to keep that point/object in the same place on screen while zooming ? Changing the camera position is not allowed.. I projected the 3d pos of the object on screen and remembered it. Then on each frame I calculate the direction to it in camera space and then I construct a rotation matrix to align this direction to Z axis (in cam space). After this, I calculate the direction from the camera to the object in world space and transform this vector with the matrix I obtained earlier and then use this final vector as the camera's new direction. And it's actually "kinda working", the problem is that it is more/less off than the camera's rotation before starting to zoom depending on the area you are trying to zoom in (larger error on edges/corners). It looks acceptable, but I'm not settling for only this. Any suggestions/resources for doing this technique perfectly ? If some of you want to explain the math in detail, be my guests, I can understand these things well. Thanks. Edit: I'll check often for responses, I'm really curious about this :D

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• Update fails to Install

  - by FirmTech

  I get the below error when I try to install updates using Software Updater: Not enough free disk space The upgrade needs a total of 81.3 M free space on disk '/boot'. Please free at least an additional 15.9 M of disk space on '/boot'. Empty your trash and remove temporary packages of former installations using 'sudo apt-get clean'. What should I do? firmtechnologies@FirmTechnologies:~$ (ls -l /boot) total 155801 -rw-r--r-- 1 root root 1158016 May 3 01:30 abi-3.13.0-24-generic -rw-r--r-- 1 root root 1161713 May 8 01:31 abi-3.13.0-26-generic -rw-r--r-- 1 root root 1161713 May 15 20:07 abi-3.13.0-27-generic -rw-r--r-- 1 root root 1161764 Jun 4 22:57 abi-3.13.0-29-generic -rw-r--r-- 1 root root 165510 May 3 01:30 config-3.13.0-24-generic -rw-r--r-- 1 root root 165538 May 8 01:31 config-3.13.0-26-generic -rw-r--r-- 1 root root 165521 May 15 20:07 config-3.13.0-27-generic -rw-r--r-- 1 root root 165544 Jun 4 22:57 config-3.13.0-29-generic drwxr-xr-x 5 root root 1024 Jun 6 14:31 grub -rw-r--r-- 1 root root 29091568 May 7 21:31 initrd.img-3.13.0-24-generic -rw-r--r-- 1 root root 29094684 May 12 12:24 initrd.img-3.13.0-26-generic -rw-r--r-- 1 root root 29095678 May 18 10:57 initrd.img-3.13.0-27-generic -rw-r--r-- 1 root root 29093700 Jun 6 14:32 initrd.img-3.13.0-29-generic drwx------ 2 root root 12288 Apr 30 17:11 lost+found -rw-r--r-- 1 root root 176500 Mar 12 13:31 memtest86+.bin -rw-r--r-- 1 root root 178176 Mar 12 13:31 memtest86+.elf -rw-r--r-- 1 root root 178680 Mar 12 13:31 memtest86+_multiboot.bin -rw------- 1 root root 3372643 May 3 01:30 System.map-3.13.0-24-generic -rw------- 1 root root 3377429 May 8 01:31 System.map-3.13.0-26-generic -rw------- 1 root root 3377429 May 15 20:07 System.map-3.13.0-27-generic -rw------- 1 root root 3378267 Jun 4 22:57 System.map-3.13.0-29-generic -rw------- 1 root root 5776416 May 3 01:30 vmlinuz-3.13.0-24-generic -rw------- 1 root root 5790912 May 8 01:30 vmlinuz-3.13.0-26-generic -rw------- 1 root root 5790912 May 15 20:07 vmlinuz-3.13.0-27-generic -rw------- 1 root root 5792544 Jun 4 22:57 vmlinuz-3.13.0-29-generic

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• How often is seq used in Haskell production code?

  - by Giorgio

  I have some experience writing small tools in Haskell and I find it very intuitive to use, especially for writing filters (using interact) that process their standard input and pipe it to standard output. Recently I tried to use one such filter on a file that was about 10 times larger than usual and I got a Stack space overflow error. After doing some reading (e.g. here and here) I have identified two guidelines to save stack space (experienced Haskellers, please correct me if I write something that is not correct): Avoid recursive function calls that are not tail-recursive (this is valid for all functional languages that support tail-call optimization). Introduce seq to force early evaluation of sub-expressions so that expressions do not grow to large before they are reduced (this is specific to Haskell, or at least to languages using lazy evaluation). After introducing five or six seq calls in my code my tool runs smoothly again (also on the larger data). However, I find the original code was a bit more readable. Since I am not an experienced Haskell programmer I wanted to ask if introducing seq in this way is a common practice, and how often one will normally see seq in Haskell production code. Or are there any techniques that allow to avoid using seq too often and still use little stack space?

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• E: Sub-process /usr/bin/dpkg returned an error code (1)

  - by kss

  sudo apt-get install acroread, i got the following output Reading package lists... Done Building dependency tree Reading state information... Done Suggested packages: libldap2 libgnome-speech7 The following NEW packages will be installed: acroread 0 upgraded, 1 newly installed, 0 to remove and 6 not upgraded. 1 not fully installed or removed. Need to get 0 B/60.1 MB of archives. After this operation, 142 MB of additional disk space will be used. (Reading database ... 237901 files and directories currently installed.) Unpacking acroread (from .../acroread_9.5.1-1precise1_i386.deb) ... dpkg: error processing /var/cache/apt/archives/acroread_9.5.1-1precise1_i386.deb (--unpack): failed in write on buffer copy for backend dpkg-deb during `./opt/Adobe/Reader9/Browser/intellinux/nppdf.so': No space left on device No apport report written because MaxReports is reached already dpkg-deb: error: subprocess paste was killed by signal (Broken pipe) Processing triggers for bamfdaemon ... Rebuilding /usr/share/applications/bamf.index... Processing triggers for desktop-file-utils ... Processing triggers for gnome-menus ... Processing triggers for man-db ... /usr/bin/mandb: can't write to /var/cache/man/1645: No space left on device Errors were encountered while processing: /var/cache/apt/archives/acroread_9.5.1-1precise1_i386.deb E: Sub-process /usr/bin/dpkg returned an error code (1)

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