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• Testing of visualization projects

  - by paxRoman

  We develop small to large visualization projects for different tasks and industries and sometimes while rewriting them a couple of times in the process we hit walls because we discover that we need to add a lot of code to support new requirements. Now we have established a design process that seems to work well (at least we reduced the development time for each new project quite a bit), but we're still left scratching our heads around this question: what exactly should we test when testing visualizations? If everything that we want to explore is on the screen (bounded visualizations)? If the data is ok - if data is valid (that's one of the nice things about visualizations you can spot errors in your datasets)? Usability? User interaction? Code quality? I can tell you for sure that a simple check of the code quality is certainly not enough! Is there a classic paper / book about how to test visualizations? Also do you happen to know about classic design patterns for visualizations (except the obvious ones like Pub-Sub)?

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• techniques for displaying vehicle damage

  - by norca

  I wonder how I can displaying vehicle damage. I am talking about an good way to show damage on screen. Witch kind of model are common in games and what are the benefits of them. What is state of the art? One way i can imagine is to save a set of textures (normal/color/lightmaps, etc) to a state of the car (normal, damage, burnt out) and switch or blending them. But is this really good without changing the model? Another way i was thinking about is preparing animations for different locations on my car, something like damage on the front, on the leftside/rightside or on the back. And start blending the specific animation. But is this working with good textures? Whats about physik engines? Is it usefull to use it for deforming vertexdata? i think losing parts of my car (doors, sirens, weapons) can looks really nice. my game is a kind of rts in a top down view. vehicles are not the really most importend units (its no racing game), but i have quite a lot in. thx for help

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• Why would my mouse pointer be jerky when it can't get a signal from my router?

  - by izb

  I've got a fairly new PC but when moving the mouse across the screen, the pointer jerks as if the PC is freezing momentarily every second or so. Strangely, this only seems to happen if the signal from the wifi router is bad. If I move the PC closer to the router to get a full signal, it's fine. It also seems to affect the keyboard; Opening notepad and holding down a key shows the same momentary freezes. -- Update: It's a logitech wireless mouse, and a wired USB logitech keyboard.

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• Remove enemy when bullet hits enemy

  - by jordi12100

  For my education I have to make a basic game in HTML5 canvas. The game is a shooter game. When you can move left - right and space is shoot. When I shoot the bullets will move up. The enemy moves down. When the bullet hits the enemy the enemy has to dissapear and it will gain +1 score. But the enemy will dissapear after it comes up the screen. Demo: http://jordikroon.nl/test.html space = shoot + enemy shows up This is my code: for (i=0;i<enemyX.length;i++) { if(enemyX[i] > canvas.height) { enemyY.splice(i,1); enemyX.splice(i,1); } else { enemyY[i] += 5; moveEnemy(enemyX[i],enemyY[i]); } } for (i=0;i<bulletX.length;i++) { if(bulletY[i] < 0) { bulletY.splice(i,1); bulletX.splice(i,1); } else { bulletY[i] -= 5; moveBullet(bulletX[i],bulletY[i]); for (ib=0;ib<enemyX.length;ib++) { if(bulletX[i] + 50 < enemyX[ib] || enemyX[ib] + 50 < bulletX[i] || bulletY[i] + 50 < enemyY[ib] || enemyY[ib] + 50 < bulletY[i]) { ++score; enemyY.splice(i,1); enemyX.splice(i,1); } } } } Objects: function moveBullet(posX,posY) { //console.log(posY); ctx.arc(posX, (posY-150), 10, 0 , 2 * Math.PI, false); } function moveEnemy(posX,posY) { ctx.rect(posX, posY, 50, 50); ctx.fillStyle = '#ffffff'; ctx.fill(); }

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• ProStar gaming laptop, which had Ubuntu 10.10, won't boot past Grub. Thoughts?

  - by Richard Zak

  At work we have some high-end gaming laptops we use for their dual GPUs. The machines have second generation i7 CPUs, and came with Windows 7. On most of them I installed Ubuntu 10.10, and all was fine. There were two laptops that I wanted to repurpose and wanted to reinstall the OS. It boots the CD (burned Ubuntu installation CD, I've tried 10.10, 11.10, and 12.04, as well as CentOS 6), and when Grub tried to boot the kernel, I just get a cursor blinking in the upper left corner of the screen. I tried the disabling of ACPI and the other items in the advanced menu, but nothing works. I could still boot to the current Linux installation though. I was able to install Windows 7 again, and use WUBI, but I think that works because it uses the Windows bootloader and not Grub. How could it have worked before and not now? I have confirmed that the CD is fine, as are the hard drive and CD drive. I also had the same problem with Debian, and had to boot through Windows 7 to install it.

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• Fast determination of whether objects are onscreen in 2D

  - by Ben Ezard

  So currently, I have this in each object's renderer's update method: float a = transform.position.x * Main.scale; float b = transform.position.y * Main.scale; float c = Camera.main.transform.position.x * Main.scale; float d = Camera.main.transform.position.y * Main.scale; onscreen = a + width - c > 0 && a - c < GameView.width && b + height - d > 0 && b - d < GameView.height; transform.position is a 2D vector containing the game engine's definition of where the object is - this is then multiplied by Main.scale to translate that coordinate into actual screen space Similarly, Camera.main.transform.position is the in-engine representation of where the main camera is, and this is also multiplied by Main.scale The problem is, as my game is tile-based, thousands of these updates get called every frame, just to determine whether or not each object should be drawn - how can I improve this please?

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• Nifty default controls prevent the rest of my game from rendering

  - by zergylord

  I've been trying to add a basic HUD to my 2D LWJGL game using nifty gui, and while I've been successful in rendering panels and static text on top of the game, using the built-in nifty controls (e.g. an editable text field) causes the rest of my game to not render. The strange part is that I don't even have to render the gui control, merely declaring it appears to cause this problem. I'm truly lost here, so even the vaguest glimmer of hope would be appreciated :-) Some code showing the basic layout of the problem: display setup: // load default styles nifty.loadStyleFile("nifty-default-styles.xml"); // load standard controls nifty.loadControlFile("nifty-default-controls.xml"); screen = new ScreenBuilder("start") {{ layer(new LayerBuilder("baseLayer") {{ childLayoutHorizontal(); //next line causes the problem control(new TextFieldBuilder("input","asdf") {{ width("200px"); }}); }}); }}.build(nifty); nifty.gotoScreen("start"); rendering glMatrixMode(GL_PROJECTION); glLoadIdentity(); GLU.gluOrtho2D(0f,WINDOW_DIMENSIONS[0],WINDOW_DIMENSIONS[1],0f); //I can remove the 2 nifty lines, and the game still won't render nifty.render(true); nifty.update(); glMatrixMode(GL_PROJECTION); glLoadIdentity(); GLU.gluOrtho2D(0f,(float)VIEWPORT_DIMENSIONS[0],0f,(float)VIEWPORT_DIMENSIONS[1]); glTranslatef(translation[0],translation[1],0); for (Bubble bubble:bubbles){ bubble.draw(); } for (Wall wall:walls){ wall.draw(); } for(Missile missile:missiles){ missile.draw(); } for(Mob mob:mobs){ mob.draw(); } agent.draw();

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• Is it possible to use WebMatrix with pure IIS?

  - by Mike Christensen

  I'd like to check out WebMatrix for publishing our site to IIS automatically (right now, I have to zip it up, copy it out, Remote Desktop into the server, unzip it, etc). However, every example I can find on how to setup WebMatrix involves Azure, or using a .publishsettings file that you'd get from your hosting provider. I'm curious if I can publish to a normal, every day IIS server running on Windows Server 2008. So far, all I've done to the IIS server is install Web Deploy, which I believe is the protocol that WebMatrix uses to publish. When I enter the Remote Site Settings screen, I select Enter settings. I select Web Deploy as the protocol, type in my NT domain credentials (I'm an Admin on that server). I put in the site URL for the Site Name and Destination URL. When I click Validate Connection, I get: Am I doing something wrong, or is this just not possible to do?

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• Massive Xubuntu desktop malfunction

  - by viktiglemma

  I'm using Xubuntu 11.04. Before everything worked fine, but when booting today the following happened: 1) Window focus does not leave the first-opened program. This means that if I keep Firefox open, and open a terminal, window focus will never be transferred to the terminal. (EDIT: if I open a terminal first, and then open Firefox, Firefox steals focus) 2) Window menus have disappeared. The maximize, minimize, etc., buttons and menu are gone. 3) In Xfce Settings Manager, the "Window Manager" settings window is empty. There is just a gray screen there, so I cannot modify any window settings. 4) The keyboard shortcuts I had previously defined using the Settings Manager do no longer work. Further, ALT-TAB no longer works for cycling between windows. 5) The mouse pointer does not show when I first log in. I have to log out and log in again (with an invisible pointer) before the mouse shows itself. EDIT: 6) I cannot resize or move the Thunderbird window, but I can move the Firefox window What can I do to troubleshoot this?

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• Xorg becomes unkillable at 3AM

  - by chew socks

  Most nights, some time in the hour of 3AM my xorg process will increase to 100% cpu and gpu load will also increase to 100%. The process also becomes unkillable. I cannot sudo kill -9 it or get back control with sudo service lightdm restart. I also cannot switch to to a tty screen with ctrl + alt + f1. To reboot I have to log in with ssh, but this is not perfect because if I reboot while it is doing this my ZFS pool will fail to mount when it comes back up ( that is where my /home is ). Does anyone have any ideas as to why I can't stop and restart xorg, or even better, know why this is happening? Thanks NOTE: For anyone who comes looking for the same problem. I disabled catalyst AI and made it through the night. I've been up for 1 day 3 hours now. My record for this month is 2 days and 19 hours without a problem. My all time record is 6 days without a crash. I'll post here if it crashes again or I'm able to set a new record.

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• Reporting Solution in PHP / CodeIgniter - Server side logic vs client side

  - by dot

  I'm building a report for an end user. They would like to see a list of all widgets... but then also like to see widgets with missing attributes, like missing names, or missing size. So i was thinking of creating one method that returns json data containing all widgets... and then using javascript to let them filter the data for missing data, instead of requerying the database. Ultimately, they need to be able to save all "reports" (filtered versions of data) inside a csv file. These are the two options I'm mulling over: Design 1 Create 3 separate methods in my controller/model like: get_all_data() get_records_with_missing_names() get_records_with_missing_size() And then when these methods are called, I would display the data on screen and give them a button to save to csv file. Design 2 Create one method called get_all_data() and then somehow, give them tools in the view to filter the json data using tables etc... and then letting them save subsets of the data. The reality is, in order to display all data, I still need to massage the data, and therefore, I know which records are missing attributes. So i'd rather not create separate methods by each filter. I'm not sure how I would do that just yet but at this point, i would like to know some pros/cons of each method. Thanks.

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• Cannot use second display with 12.04 and Intel 2000/3000

  - by Carolyn Marenger

  I am unable to get anything to display on my second monitor, or even get the system to recognize that there is a second screen. I am running Ubuntu 12.04 on a Gigabyte GA-H61M-S2PV, revision 2.0 box. The integrated chipset is an Intel 2000/3000, and there are both a D-Dub and a DVI-D display ports on the MB. This is the first operating system I have installed on this system. I have a second monitor plugged into the DVI-D port via a DVI-D to D-Sub adapter. I cannot verify that the motherboard or adapter were/are working, short of installing windows to test the theory. When I go into the "System Settings - Displays" control window, it shows one display. I have rebooted with the second monitor attached, and I have perused the BIOS settings in case it might have been disabled. So far, I have had no indication that the second monitor is recognized, not even a flicker at power on. If I swap monitors and cables between the DVI-D and D-Dub ports, the other monitor lights up, so I know the monitor and video cable are not the issue. Any suggestions would be appreciated. Thanks, Carolyn

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• Simple multi-seat

  - by Oli

  I've asked about multiseat before. The answer (for 10.04) involved doing it the proper way (eg through gdm, multiple server layouts). The problem was that gdm needs to be patched or reverted to 2.20 for multiseat. It's an ugly hack that, worse than anything, will hold up future updates. As a result, I didn't do anything. I still have a spare video card. I still have the monitor, keyboard and mouse all sitting waiting to jump into action. And I still want to be able to turn that into a simple desktop. My needs don't seem complicated. I have a second video card, a USB hub and anything connected to that USB hub that I want to be dedicated to another X server. I don't need a login screen (I'm happy hard-coding in a auto-login and I'd be happy with the user starting the X server if that's possible). This is so simple in my head that I only need two questions: How can I explicitly start an X server from the command line on an unused video adapter (by passing it whatever configuration I need to)? Can I have this new X session load a desktop environment on load? This seems like something you should be able to write in a little upstart script within 10 minutes. That would be perfect for me as then I'd have a nice start/stop control over the secondary desktop from the main desktop (that I want to leave unscathed!) I'm thinking something as simple as this for the payload: su -u other_user -c "startx -- localhost hardware-information" And use .xinitrc to load openbox or something...

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• Problem with installing Nvidia display drivers on Ubuntu 13.10

  - by Pascal

  Hello everyone and thank you for taking a look at this topic! I'm currently trying out Ubuntu 13.10 but I keep hitting a wall when it comes to installing a driver. I've tried: sudo apt-get install nvidia-current This resulted in a un-bootable system. The screen just stayed black and the cursor displayed as an 'X'. After that I did had to re-install Ubuntu. The computer I'm using is an Acer-Aspire-V3 with a build in Nvidia geforce GT 630M and also with a Intel HD graphics chip-set (not sure if chip-set is the right word here). "lspci | grep VGA" output: pascal@pascal-Aspire-V3-571G:~$ lspci | grep VGA 00:02.0 VGA compatible controller: Intel Corporation 3rd Gen Core processor Graphics Controller (rev 09) 01:00.0 VGA compatible controller: NVIDIA Corporation GF108M [GeForce GT 630M] (rev a1) I've searched a bit here and there and found out that it would be wise to mention that this laptop is using (or so I think) Nvidia Optimus, not sure if it will add anything to the subject but at least I'll mention it just to be sure. Now to the questions: Q1 How is this caused and how can I fix it? Q2 What additional information could I provide to help you help me?

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• 13.10 doesn't boot on Vaio Pro 13

  - by vaioonbuntu

  I just installed Ubuntu 13.10 on my new Vaio Pro 13, disabled safe mode, but used UEFI and not legacy mode. I did an encrypted LVM installation and erased the complete SSD. It booted just fine from USB, but after installation it doesn't boot. The Vaio failed boot screen appears. I then tried this advice here: 13.10 on vaio pro with UEFI sadly it fails for me with "/usr/sbin/grub-probe: error: failed to get canonical path of /cow." I then tried mounted the encrypted partition with Nautilus and tried this: Cannot update grub with paramters on live USB With /dev/sda2 and then to install GRUB to /dev/sda. Didn't succeed and warned me that the "GPT partition label contains no BIOS Boot Partition; embedding won't be possible" What do i have to do, go fix GRUB and be able to boot my finished install? Here's my Boot Repair Log: http://paste.ubuntu.com/6386598/ I would really appreciate any help, I'm so happy to finally be able to ditch my big fat Macbook Pro and use Ubuntu on my new, light Vaio Pro, if only I could fix GRUB. best, x

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• How do I recover files from a corrupt VDI file?

  - by Eric P

  Is it possible to repair a corrupt VDI file? The OS on the VDI (XP) doesn't boot at all, it just hangs at a black screen. I was getting file errors before on its last boot, but now its not working at all. Sector viewer shows 'Invalid partition table Error loading operating system Missing operating system'. I tried mounting the file from the host OS, but it just says that the drive isn't formatted. I don't need to be able to run the VDI, but I do need some files that are on it. Is there any way to recover files from the corrupt VDI file?

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• how to get to accounts menu of Messaging on Windows Mobile 6.1?

  - by user13743

  I'm trying to delete an email account from the Messaging app in Windows Mobile 6.1 . I foud this website http://dsaxman.com/mobile/how-to-delete-an-email-account-on-windows-mobile-6-1/ that explains it, but the step where they go from the Home screen to the list of accounts on Messaging I'm getting stuck at. Instead of seeing the list of accounts ( The image under "3. Once you are in the messaging application:" ), I see a list of emails from specific accounts. How do I get to this menu?

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• xrander detect only one display

  - by cupakob

  Hi all, i have a problem, to get a picture on my tv over VGA (and also over S-Video to SCART). I've tried it first over xorg, but without success. After that i tried xrand, but xrander detect only my laptop display, here the output bufka [~] $ xrandr -q Screen 0: minimum 1680 x 1050, current 1680 x 1050, maximum 1680 x 1050 default connected 1680x1050+0+0 0mm x 0mm 1680x1050 50.0* 51.0 52.0 Any suggestions, how to solve the problem? My video card is Nvidia Geforce 8600M GT, TV is LG M227WPD and OS Ubuntu Lucid...

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• Reboot loop after Windows XP Service Pack 3 update

  - by espais

  Recently I upgraded to Service Pack 3, and now it seems that something has gone terribly wrong with the update. After logging in, my computer will blue screen after about 5 minutes and then go into a reboot loop (I don't have the exact error message handy). I have a Sager NP2092 notebook, running an Intel chipset. I'd rather avoid having to reformat my XP, especially with my copy of Windows 7 arriving right around the corner. After doing some Googling, I came across this article: Does your AMD-based computer boot after installing XP SP3? However, it deals with the AMD chips, and specifically states not to use its fix on Intel based systems. EDIT After killing the reboot, this is the error that pops up: STOP: 0x000000F4 (0x00000003, 0x8A187118, 0x8A18728C, 0x80604438) EDIT2 I have run Memtest86, and it reported 0 errors.

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• Windows 7- New Windows Are Not Displayed

  - by Peter

  I am running an up-to-date and OEM version of Windows 7. I have been experiencing an annoying problem for the past few weeks where new windows are not displayed 70-80% of the time. For example, when I launch notepad, the notepad window is not displayed or when I select save from the file menu, the save dialog is not displayed. The window is there, but it is not being displayed; the screen is not refreshed. The way to work around this problem is to force a system-wide refresh by pressing CTRL+SHIFT+DEL and then cancelling hiding all windows using "show desktop" then displaying the window needed via taskbar Can anyone please point me in the right direction to solving this problem? What could be causing this?

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• jBullet Collision/Physics not working as expected

  - by Kenneth Bray

  Below is the code for one of my objects in the game I am creating (yes although this is a cube, I am not making anything remotely like MineCraft), and my issue is I while the cube will display and is does follow the physics if the cube falls, it does not interact with any other objects in the game. If I was to have multiple cubes in screen at once they all just sit there, or shoot off in all directions never stopping. Anyway, I am new to jBullet, and any help would be appreciated. // Constructor public Cube(float pX, float pY, float pZ, float pSize) { posX = pX; posY = pY; posZ = pZ; size = pSize; rotX = 0; rotY = 0; rotZ = 0; // physics stuff fallMotionState = new DefaultMotionState(new Transform(new Matrix4f(new Quat4f(0, 0, 0, 1), new Vector3f(posX, posY, posZ), 1))); fallRigidBodyCI = new RigidBodyConstructionInfo(mass, fallMotionState, fallShape, fallInertia); fallRigidBody = new RigidBody(fallRigidBodyCI); }

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• Windows bios fails to boot up, keeps resetting

  - by Dwayne Diamond

  When I turn the computer on this error always happens wher jus after it starts up this screen pops up wher it says F1 to enter BIOS setup or F2 to start Windows Normally and if I press F2 it goes into Windows but freezez then I hav 2 turn the pc off, Problem is the BIOS + Date and Time keeps resetting itself somehow and it's not the battery because I put a new one in so when I manage 2 load default settings and get it working after some struggle and I shut down the pc the next day I switch the pc on and does the whole process again... What could this problem be and how can I fix it??? Thank you

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• How do I separate model positions from view positions in MVC?

  - by tieTYT

  Using MVC in games (as opposed to web apps) always confuses me when it comes to the view. How am I supposed to keep the model agnostic of how the view is presenting things? I always end up giving the Model a position that holds x and y but invariably, these values end up being in units of pixels and that feels wrong. I can see the advantage* of avoiding that but how am I supposed to? This idea was suggested: Don't think of it in units of pixels, think of them in arbitrary distance units that just happen map to pixels at a 1:1 ratio. Oh, the resolution is half of what it was? We are now taking the x/y coordinates at 50% value for screen display, and your spells casting range is still 300 units long, which now is 150 pixels. But those numbers conveniently work out. What do I do if the numbers divide in such a way that I get decimal places? Floating points are unsafe. I think allowing decimal places would eventually cause really weird bugs in my game. *It'd let me write the model once and write different views depending on the device.

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• Missing launcher after 12.04 upgrade

  - by Preston Zacharias

  I recently upgraded to ubuntu 12.04 and after doing some updates and such my application launcher and title bars (for window dialogues) are missing. Basically the entire unity GUI is missing! Not sure what happened so I installed gnome 3 and it was missing a launcher too, but did have title bars. In addition the bar found at the top that lets you know what's open and allows gnome extensions to be displayed is not interactive. I can't click, right click, alt + click (right or left), alt + super click (right or left) anywhere! I even installed an application menu from the gnome site and it is not interactive either. However, since there is no way to launch applications i have to use terminal and if i minimize an app it will disappear completely. Then i decided to try unity 2D and it is incredibly messed up. Black background, launcher is there but icons and top bar while on desktop are completely distorted. They're not just pixalated; they're all sorts of funky colors and when i open something from unity 2d launcher it will show it's opened in the launcher but nothing appears on my screen. When trying to view videos on youtube the video is distorted and looks just as unity 2d does. Strange enough: the audio works fine, just not videos. Pictures loads, but not ads that stream video. Any suggestions to get my launcher and the unity GUI back? I tried reinstalling gnome, unity 3d, and unity 2d from terminal. no change. also reinstalled unity desktop and tried resetting it: nothing happened.

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• Shortcut Keys for external monitor with XP

  - by Rhys

  Last night my laptop (samsung nc20 running XP) fell off the table and the screen cracked leaving me unable to see anything. I have arranged for a it to be repaired but want to make a back up of several folders before it gets sent away. I was planning to use my parents LG LCD tv as an external monitor so I can see what I am doing when copying things to but after plugging it in nothing seems to happen (works instantly on another laptop running vista) and hotkeys seem to be of no use at all. Does anyone know the series of shortcut keys I will need to do to get XP to use an external monitor? Thanks in advance

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