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• Challenge Ends on Friday!

  - by Yolande Poirier

  This is your last chance to win a JavaOne trip. Submit a project video and code for the IoT Developer Challenge by this Friday, May 30.  12 JavaOne trips will be awarded to 3 professional teams and one student team. Members of two student teams will win laptops and certification training vouchers. Ask your last minute questions on the coaching form or the Challenge forum. They will be answered promptly. Your project video should explain how your project works. Any common video format such as mp4, avi, mov is fine. Your project must use Java Embedded - whether it is Java SE Embedded or ME Embedded - with the hardware of your choice, including any devices, boards and IoT technology. The project will be judged based on the project implementation, innovation and business usefulness. More details on the IoT Developer Challenge website  Just for fun! Here is a video of Vinicius Senger giving a tour of his home lab, and showing his boards and gadgets. &lt;span id=&quot;XinhaEditingPostion&quot;&gt;&lt;/span&gt;

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• Wrong resolution for Lightdm/GDM on Ubuntu 13.04 using HDMI

  - by f03lipe

  I've tried all the solution I could find on the matter so far, but the error persists. My problem is that the login screen (both under gdm and lightdm) runs with the wrong resolution, even though all is fine when I log in. The error occurs solely when I have my HDMI cable connected to my other screen. The login screen resolution becomes 1024x768 (for my 1366x768 laptop screen) and mirrored on my screen, which is 1920x1080. I've had this issue on version 12.04 (the last one before I upgraded to 13.04), but I got it fixed by adding the xrandr commands on the begining of the /etc/gdm/Init/Default file. This doesn't seem to work anymore. I've also tried telling lightdm to run a script fixing the resolution with xrandr (by editing /etc/lightdm/lightdm.conf), but lightdm crashes, and I'm forced to log in with low graphic settigs. Hint: when ubuntu is loading, the resolution starts OK, then goes bad right before the login screen is initialized. Does that mean that there's nothing wrong with my graphic cards? What do you think? Cheers!

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• Dedicated server: managed hosting or manage it myself?

  - by ddawber

  We're currently hosting a number of sites on a self-managed dedicated server. Some companies, however, offer a managed dedicated server hosting service. They offer: Roughly the same server spec Ticketing system support Managed daily backups Virtual firewall (but with a limit of 10 IP addresses allowed through at any one time) Now, this managed hosting is at extra expense - somewhere in the region of $500 per month, and the limit on the number of IP addresses they'll manage on the firewall is also a real pain. My thinking is it would be better and cheaper to Stay with the same host since the dedicated box is fine Get an Amazon AWS account and use their server to manage backups; there are a number of good tools that can be used to automate the process Configure iptables so that I have complete control of the firewall I want to know Is a managed virtual firewall likely to be more secure than me configuring iptables? Whether, in your opinion, it's best to let someone else take care of backups? If, from your experience, there's anything else i'm missing that warrants using managed hosting over a DIY service? I think there is some reluctance to not having managed hosting since a managed host in effect takes responsibility for your server, whereas any hardware or security issues with a server that we manage would mean we are forced to hold our hands up when a client site goes down. That said, I personally don't think a managed host does that much in the day to day running of your server (backups are automatic, OS updates are carried out with ease, etc.).

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• Solving &ldquo;XmlSchemaException: The global element '&lt;elementName&gt;' has already been declare

  - by ChrisD

  I recently encountered this error when I attempted to consume a new hosted WCF service.  The service used the Request/Response model and had been properly decorated.  The response and request objects were marked as DataContracts and had a specified namespace.   My WCF service interface was marked as a ServiceContract and shared the namespace attribute value.   Everything should have been fine, right? [ServiceContract(Namespace = "http://schemas.myclient.com/09/12")] public interface IProductActivationService { [OperationContract] ActivateSoftwareResponse ActivateSoftware(ActivateSoftwareRequest request); } well, not exactly.  Apparently the WSDL generator was having an issue: System.Xml.Schema.XmlSchemaException: The global element 'http://schemas.myclient.com/09/12:ActivateSoftwareResponse' has already been declared. After digging I’ve found the problem; the WSDL generator has some reserved suffixes for its entities, including Response, Request, Solicit (see http://msdn.microsoft.com/en-us/library/ms731045.aspx).  The error message is actually the result of a naming conflict.  The WSDL generator uses the namespace of the service to build its reserved types.  The service contract and data contract share a namespace, which coupled with the response/request name suffixes I was using in my class names, resulted in the SchemaException. The Fix: Two options: Rename my data contract entities to use a non-reserved keyword suffix (i.e.  change ActivateSoftwareResponse to ActivateSoftwareResp). or; Change the namespace of the data contracts to differ from the service contract namespace. I chose option 2 and changed all my data contracts to use a “http://schemas.myclient.com/09/12/data” namespace value. This avoided a name collision and I was able to produce my WSDL and consume my service.

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• Javascript Isometric draw optimization

  - by hustlerinc

  I'm having trouble with isometric tiles drawing. At the moment I got an array with the tiles i want to draw. And it all works fine until i increase the size of the array. Since I draw ALL tiles on the map it really affects the game performance (obviously) :D. My problem is I'm no genius when it comes to javascript and I haven't managed to just draw what is in viewport. Should be fairly simple for an expert though because its fixed sizes etc. Canvas is 960x480 pixels, each tile 64x32. This gives 16 tiles on first row, 15 on the next etc. for a total of 16 rows. Tile 0,0 is in the top-right corner. And draws X up to down and Y right to left. Going through the tiles on the first row from left to right as +X -Y. Here is the relevant part of my drawMap() function drawMap(){ var tileW = 64; // Tile Width var tileH = 32; // Tile Height var mapX = 960-32; var mapY = -16; for(i=0;i<map.length;i++){ for(j=0;j<map[i].length;j++){ var drawTile = map[i][j]; var drawObj = objectMap[i][j]; var xpos = (i-j)*tileH + mapX; var ypos = (i+j)*tileH/2 + mapY; // Place the tiles isometric. ctx.drawImage(tileImg[drawTile],xpos,ypos); if(drawObj){ ctx.drawImage(objectImg[drawObj-1],xpos,ypos-(objectImg[drawObj- 1])); } } } } Could anyone please help me how to translate this to just draw the relevant tiles? It would be deeply appreciated.

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• How to make an Actor follow my finger

  - by user48352

  I'm back with another question that may be really simple. I've a texture drawn on my spritebatch and I'm making it move up or down (y-axis only) with Libgdx's Input Handler: touchDown and touchUp. @Override public boolean touchDown(int screenX, int screenY, int pointer, int button) { myWhale.touchDownY = screenY; myWhale.isTouched = true; return true; } @Override public boolean touchUp(int screenX, int screenY, int pointer, int button) { myWhale.isTouched = false; return false; } myWhale is an object from Whale Class where I move my texture position: public void update(float delta) { this.delta = delta; if(isTouched){ dragWhale(); } } public void dragWhale() { if(Gdx.input.getY(0) - touchDownY < 0){ if(Gdx.input.getY(0)<position.y+height/2){ position.y = position.y - velocidad*delta; } } else{ if(Gdx.input.getY(0)>position.y+height/2){ position.y = position.y + velocidad*delta; } } } So the object moves to the center of the position where the person is pressing his/her finger and most of the time it works fine but the object seems to take about half a second to move up or down and sometimes when I press my finger it wont move. Maybe there's another simplier way to do this. I'd highly appreciate if someone points me on the right direction.

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• HP Envy dv6t-7300: Disabled WiFi through button and can't enable it anymore

  - by Mateus B. Cassiano

  Well, I have a HP Envy dv6t-7300 laptop that came with a Ralink RT5390 WiFi card. Everything was working perfectly, and eventually I press the WiFi button in my keyboard to toggle the card on/off. Until today, all worked right: if the wifi was off (wifi LED amber) and I press the wifi button, after a few seconds the LED turn white and everything works. If I repeat the process, the wifi LED turn amber and the card get disabled, but now, I can't turn it on anymore. running sudo rfkill list all I get: 0: phy0: Wireless LAN Soft blocked: no Hard blocked: no 1: hp-wifi: Wireless LAN Soft blocked: no Hard blocked: yes So, I ran sudo rfkill unblock all but nothing changed. As a side note, if I run sudo ifconfig wlan0 up, the indicator LED gets white (indicating that the card was enabled), but Ubuntu still say that the card is blocked by hardware. Extra information: the card works without issues in windows and in Ubuntu installer (booting from a live CD). I'm using the card out-of-box, using the drivers already included in Ubuntu 12.10. The module rt2800pci is loaded and working fine, not blacklisted, etc, etc. The card and the button toggle worked flawlessly until today, when I toggled it off and can't turn it on anymore... The problem is back, but in a different manner: if I don't press the wifi key a few times during the grub loading, in the login screen the wifi button will be ambar (disabled), pressing it will toggle it white (enabled) or ambar (disabled) again, but ubuntu still says that the network card was disabled by hardware and doesn't connect... In other words, if I don't press the WiFi button a few times when Ubuntu is booting, it will be stuck with the "network card was disabled by hardware" message, even if the light is white (enabled). Any clue? Maybe a error in some startup script or config file?

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• keyPressed is not working after adding ActionListener to JButton

  - by Yehonatan

  I have a serious problem while trying to build a menu for my game. I've added two JButton to a main JPanel and added an ActionListener for each of them. The main JPanel also contains the game JPanel which have the keyPressed method inside keyController. That's how it looks - Main -       JPanel -         JButton, JButton,         JPanel which contains the game and keyPressed function inside KeyController class which worked fine before I added the ActionListener for JButton. For some reason after I added an ActionListener for each of the button, the game JPanel is not getting any keyPreseed events nor KeyRealesed. Does anyone know the solution for my situation? Thank you very much! Main window - Scanner in = new Scanner(System.in); JFrame f = new JFrame("Square V.S Circles"); f.setUndecorated(true); f.setResizable(false); f.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE); f.add(new JPanelHandler()); f.pack(); f.setVisible(true); f.setLocationRelativeTo(null); JPanelHandler(main JPanel) - super.setFocusable(true); JButton mybutton = new JButton("Quit"); JButton sayhi = new JButton("Say hi"); sayhi.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent e) { System.out.println("Hi"); } }); mybutton.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent e) { System.exit(0); } }); add(mybutton); add(sayhi); add(new Board(2)); Board KeyController(The code inside is working so it's unnecessary to put it here) - private class KeyController extends KeyAdapter { public KeyController() { ..Code } @Override public void keyPressed(KeyEvent e) { ...Code } @Override public void keyReleased(KeyEvent e){ ...Code } }

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• Pathfinding with MicroPather : costs calculations with sectors and portals

  - by Adan

  Hello, I'm considering using micropather to help me with pathfinding. I'm not using a discrete map : I'm working in 2d with sectors and portales. However, I'm just wondering what is the best way to compute costs with this library in this context. Just to be more clear about geometrical shapes I'm using : sectors are basically convex polygons, and portals are segments that lies on sector's edge. Micropather exposes a pure virtual Graph class that you must inherate and overrides 3 functions. I understand how pathfinding works, so there's no problem in overriding those functions. Right now, my implementation give me results, i.e I'm able to find a path in my map, but I'm not sure I'm using an optimal solution. For the AdjacentCost method : I just take the distance between sector's centers as the cost. I think a better solution should be to use the portal between the two sectors, compute its center, and then the cost should be : distance( sector A center, portal center ) + distance ( sector B center, portal center ). I'm pretty sure the approximation I'm using with just sector's center is enough for most cases, but maybe with thin and long sectors that are perpendicular, this approximation could mislead the A* algorithm. For the LeastCostEstimate method : I just take the midpoint of the two sectors. So, as you understand, I'm always working with sectors' centers, and it's working fine. And I'm pretty sure there's a better way to work. Any suggestions or feedbacks? Thanks in advance!

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• Password protect an alias virtual directory

  - by Jason

  I have a main domain being hosted through CPanel. I also have a sub-domain that I would like to appear as a path under the main domain instead of as a sub-domain. So I have: http://example.com/ pointing to the main hosted file. http://example.com/mydir pointing to the subdomain files. This is achieved by a httpd.conf include from the main domain section to set an alias: alias /mydir /path/to/subdomain/files/ Now, that works fine so far. The problem is that if a .htaccess file under /path/to/the/subdomain/files/ contains an error, the alias is completely skipped, and /mydir goes instead to the main host files. That is kind of surprising to me - I would expect an error to return an error instead. Now the killer: if I try to password protect /path/to/subdomain/files/, then trying to access http://example.com/mydir will again attempt to deliver from under the main hosted files and not from /path/to/subdomain/files/ I am not seeing any errors reported on the .htaccess file in the apache error log, so I am assuming the .htaccess is valid: AuthUserFile /path/to/valid/readable/.htpasswd AuthName "Secure Access" AuthType Basic Require valid-user This kind of behaviour does not seem right to me. Is there something obvious that could be causing it? Or is this just the way it works? Perhaps using an alias is the wrong way to go?

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• How to Assure an Effective Data Model

  As a general rule in my opinion the effectiveness of a data model can be directly related to the accuracy and complexity of a project’s requirements. For example there is no need to work on very detailed data models when the details surrounding a specific data model have not been defined or even clarified. Developing data models when the clarity of project requirements is limited tends to introduce designed issues because the proper details to create an effective data model are not even known. One way to avoid this issue is to create data models that correspond to the complexity of the existing project requirements so that when requirements are updated then new data models can be created based any new discoveries regarding requirements on a fine grain level.  This allows for data models to be composed of general entities to be created initially when a project’s requirements are very vague and then the entities are refined as new and more substantial requirements are defined or redefined. This promotes communication amongst all stakeholders within a project as they go through the process of defining and finalizing project requirements.In addition, here are some general tips that can be applied to projects in regards to data modeling.Initially model all data generally and slowly reactor the data model as new requirements and business constraints are applied to a project.Ensure that data modelers have the proper tools and training they need to design a data model accurately.Create a common location for all project documents so that everyone will be able to review a project’s data models along with any other project documentation.All data models should follow a clear naming schema that tells readers the intended purpose for the data and how it is going to be applied within a project.

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• Weird 302 Redirects in Windows Azure

  - by Your DisplayName here!

  In IdentityServer I don’t use Forms Authentication but the session facility from WIF. That also means that I implemented my own redirect logic to a login page when needed. To achieve that I turned off the built-in authentication (authenticationMode="none") and added an Application_EndRequest handler that checks for 401s and does the redirect to my sign in route. The redirect only happens for web pages and not for web services. This all works fine in local IIS – but in the Azure Compute Emulator and Windows Azure many of my tests are failing and I suddenly see 302 status codes where I expected 401s (the web service calls). After some debugging kung-fu and enabling FREB I found out, that there is still the Forms Authentication module in effect turning 401s into 302s. My EndRequest handler never sees a 401 (despite turning forms auth off in config)! Not sure what’s going on (I suspect some inherited configuration that gets in my way here). Even if it shouldn’t be necessary, an explicit removal of the forms auth module from the module list fixed it, and I now have the same behavior in local IIS and Windows Azure. strange. <modules>   <remove name="FormsAuthentication" /> </modules> HTH Update: Brock ran into the same issue, and found the real reason. Read here.

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• can't get a good install:11.10 server

  - by jack

  I screwed up my partitioning aparently tring to get lvm and raid1 going. the machine is an intel dual core dt with 2 gig of ram and 2 sata drives, one 250g and the other 500g. This a build for my school in n.e. Thailand. we have 20+ clients now, a website, email. Our old server is dying fast and we are going to add another 12 stations next week. I really need some help here! 1. have onboard gigabit ethernet that aparently uses same driver as realtek 811c. I installed a pcie gigabit card also 811c. At several points the eth0 has accessed the internet fine, but the eth1 will not communicate. 2. I saw a "fix" for this online which from root: rmmod r8169. this imediately killed the working onboard card. 3.I tried to re-install 11.10 figuring that would re-install r8169. However I messed something up in my partitioning and can't get a clean boot now. 6. so I think after 12 re-installs or so and 2 days. I can get through it right if I can start over with clean drives, but I can't figure out how to empty them out what with soft raid and lvm partitions. seems like i've had it going well and then trying to fix that one little problem, i go backwards.Please help! please send email.-thanks

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• Ubuntu One has high CPU usage but no syncing

  - by Peter

  over the weekend I updated my computer to Windows 8. So far Ubuntu One was running smoothly, but ever since the update (clean, new install) Ubuntu doesn't sync any more. In Windows 7 it would start to sync at full internet speed as soon as I drop a file. But now in Windows 8, as soon as I drop a new file into the Ubuntu One folder, CPU usage goes up to about 50 % and no network traffic occurs. This stays like that for a couple of minutes, CPU usage goes back to normal and then the client says that all is in sync - which isn't true. Is it too early for Windows 8? Do others have the same problem or is there something I can do about it? I try a couple of different things, and realized that if the file size is 20 MB the files get uploaded. The original file was 1.5 GB. I also didn't work with 200, 100 and 50 MB large files. But even with 20 MB large files, the upload is very slow and not steady. The log give plenty of this error: - twisted - ERROR - Failure: exceptions.TypeError About which I don't know the meaning. By the way, the account works just fine on the Ubuntu 12.04 partition. Any help is greatly appreciated. -Peter

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• Howto run jupiter script as superuser in lubuntu-rc.xml?

  - by KamilKrzes

  I'm trying to bind to my asus eee hotkeys couple of jupiter functions to work as on Windows. The problem is that I have to run those as superuser. Under terminal scripts are working fine so I put in my ~/.config/openbox/lubuntu-rc.xml: <keybind key="XF86Launch6"> <action name="Execute"> <command>sudo /usr/lib/jupiter/scripts/cpu-control</command> </action> </keybind> Aaaaaand... It partially works. Some of files to change with this script was changed and other no. Some of the changed one are locked so sudo probably working. I have no idea how to debug this cause I don't know where to find log of this. I'm lil' bit ashamed but I don't know how exactly sudo works. I don't want to put my password every time to change cpu frequency or toggle touchpad so I don't want to use gksu or other sudo gui.

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• Can't install the wireless driver in HP Pavilion dv2419us

  - by maqtanim

  I've just installed Ubuntu 13.04 in an old HP Pavilion dv2419us. The problem is, Ubuntu doesn't detect the wireless card. But it works fine in Windows 7. The following command returns nothing! lspci -vvnn | grep 14e4 And the lspci output is: 00:00.1 RAM memory: NVIDIA Corporation C51 Memory Controller 0 (rev a2) 00:00.2 RAM memory: NVIDIA Corporation C51 Memory Controller 1 (rev a2) 00:00.3 RAM memory: NVIDIA Corporation C51 Memory Controller 5 (rev a2) 00:00.4 RAM memory: NVIDIA Corporation C51 Memory Controller 4 (rev a2) 00:00.5 RAM memory: NVIDIA Corporation C51 Host Bridge (rev a2) 00:00.6 RAM memory: NVIDIA Corporation C51 Memory Controller 3 (rev a2) 00:00.7 RAM memory: NVIDIA Corporation C51 Memory Controller 2 (rev a2) 00:02.0 PCI bridge: NVIDIA Corporation C51 PCI Express Bridge (rev a1) 00:03.0 PCI bridge: NVIDIA Corporation C51 PCI Express Bridge (rev a1) 00:05.0 VGA compatible controller: NVIDIA Corporation C51 [GeForce Go 6150] (rev a2) 00:09.0 RAM memory: NVIDIA Corporation MCP51 Host Bridge (rev a2) 00:0a.0 ISA bridge: NVIDIA Corporation MCP51 LPC Bridge (rev a3) 00:0a.1 SMBus: NVIDIA Corporation MCP51 SMBus (rev a3) 00:0a.3 Co-processor: NVIDIA Corporation MCP51 PMU (rev a3) 00:0b.0 USB controller: NVIDIA Corporation MCP51 USB Controller (rev a3) 00:0b.1 USB controller: NVIDIA Corporation MCP51 USB Controller (rev a3) 00:0d.0 IDE interface: NVIDIA Corporation MCP51 IDE (rev f1) 00:0e.0 IDE interface: NVIDIA Corporation MCP51 Serial ATA Controller (rev f1) 00:10.0 PCI bridge: NVIDIA Corporation MCP51 PCI Bridge (rev a2) 00:10.1 Audio device: NVIDIA Corporation MCP51 High Definition Audio (rev a2) 00:14.0 Bridge: NVIDIA Corporation MCP51 Ethernet Controller (rev a3) 00:18.0 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] HyperTransport Technology Configuration 00:18.1 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] Address Map 00:18.2 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] DRAM Controller 00:18.3 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] Miscellaneous Control 05:09.0 FireWire (IEEE 1394): Ricoh Co Ltd R5C832 IEEE 1394 Controller 05:09.1 SD Host controller: Ricoh Co Ltd R5C822 SD/SDIO/MMC/MS/MSPro Host Adapter (rev 19) 05:09.2 System peripheral: Ricoh Co Ltd R5C592 Memory Stick Bus Host Adapter (rev 0a) 05:09.3 System peripheral: Ricoh Co Ltd xD-Picture Card Controller (rev 05) The command lspci -nn | grep 0280 gives no output. Any suggestion regarding this?

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• Proper method to update and draw from game loop?

  - by Lost_Soul

  Recently I've took up the challenge for myself to create a basic 2d side scrolling monster truck game for my little brother. Which seems easy enough in theory. After working with XNA it seems strange jumping into Java (which is what I plan to program it in). Inside my game class I created a private class called GameLoop that extends from Runnable, then in the overridden run() method I made a while loop that handles time and such and I implemented a targetFPS for drawing as well. The loop looks like this: @Override public void run() { long fpsTime = 0; gameStart = System.currentTimeMillis(); lastTime = System.currentTimeMillis(); while(game.isGameRunning()) { currentTime = System.currentTimeMillis(); long ellapsedTime = currentTime - lastTime; if(mouseState.leftIsDown) { que.add(new Dot(mouseState.getPosition())); } entities.addAll(que); game.updateGame(ellapsedTime); fpsTime += ellapsedTime; if(fpsTime >= (1000 / targetedFPS)) { game.drawGame(ellapsedTime); } lastTime = currentTime; } The problem I've ran into is adding of entities after a click. I made a class that has another private class that extends MouseListener and MouseMotionListener then on changes I have it set a few booleans to tell me if the mouse is pressed or not which seems to work great but when I add the entity it throws a CME (Concurrent Modification Exception) sometimes. I have all the entities stored in a LinkedList so later I tried adding a que linkedlist where I later add the que to the normal list in the update loop. I think this would work fine if it was just the update method in the gameloop but with the repaint() method (called inside game.drawGame() method) it throws the CME. The only other thing is that I'm currently drawing directly from the overridden paintComponent() method in a custom class that extends JPanel. Maybe there is a better way to go about this? As well as fix my CME? Thanks in advance!!!

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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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• 12.10 no audio via hdmi and video speeds up

  - by jackson

  I have a laptop with an ati radeon 4200, on 12.04 everything worked fine, since upgrading to 12.10 I cannot get sound over the hdmi. When I switch to hdmi audio the video speeds up to about 2x. I can use the speakers in my laptop and watch video via hdmi with no problems. Things I have tried: Various tutorials to install the AMD/ATI drivers, all of which resulted in low graphics mode. Checked that everything is properly set in alsamixer, the sound utility and - installed pavucontrol and checked everything in there. Verified the output from cat /proc/asound/cards looks normal When I initially upgraded there was a plethora of problems which I believe were due to the old proprietary driver still being used but not compatible, after a few hours trying to fix that I decided just to back up and do a fresh install which works great except for the above stated problem. Any help would be greatly appreciated!! Finally hopefully this hasn't already been answered, I have tried a few different searches on the boards and haven't come up with anything. $ aplay -l **** List of PLAYBACK Hardware Devices **** card 0: SB [HDA ATI SB], device 0: ALC269VB Analog [ALC269VB Analog] Subdevices: 1/1 Subdevice #0: subdevice #0 card 1: HDMI [HDA ATI HDMI], device 3: HDMI 0 [HDMI 0] Subdevices: 0/1 Subdevice #0: subdevice #0

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• Flickering problem with world matrix

  - by gnomgrol

  I do have a pretty wierd problem today. As soon as I try to change my translation- or rotationmatrix for an object to something else than (0,0,0), the object starts to flicker (scaling works fine). It rapid and randomly switches between the spot it should be in and a crippled something. I first thought that the problem would be z-fighting, but now Im pretty sure it isn't. I have now clue at all what it could be, here are two screenshots of the two states the plant is switching between. I already used PIX, but could find anything of use (Im not a very good debugger anyway) I would appreciate any help, thanks a lot! Important code: D3DXMatrixIdentity(&World); D3DXVECTOR3 rotaxisX = D3DXVECTOR3(1.0f, 0.0f, 0.0f); D3DXVECTOR3 rotaxisY = D3DXVECTOR3(0.0f, 1.0f, 0.0f); D3DXVECTOR3 rotaxisZ = D3DXVECTOR3(0.0f, 0.0f, 1.0f); D3DXMATRIX temprot1, temprot2, temprot3; D3DXMatrixRotationAxis(&temprot1, &rotaxisX, 0); D3DXMatrixRotationAxis(&temprot2, &rotaxisY, 0); D3DXMatrixRotationAxis(&temprot3, &rotaxisZ, 0); Rotation = temprot1 *temprot2 * temprot3; D3DXMatrixTranslation(&Translation, 0.0f, 10.0f, 0.0f); D3DXMatrixScaling(&Scale, 0.02f, 0.02f, 0.02f); //Set objs world space using the transformations World = Translation * Rotation * Scale; shader: cbuffer cbPerObject { matrix worldMatrix; matrix viewMatrix; matrix projectionMatrix; }; // Change the position vector to be 4 units for proper matrix calculations. input.position.w = 1.0f; // Calculate the position of the vertex against the world, view, and projection matrices. output.position = mul(input.position, worldMatrix); output.position = mul(output.position, viewMatrix); output.position = mul(output.position, projectionMatrix);

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• Creating Gun objects with upgrades?

  - by zardon

  I have a series of guns in my game. I use the Gun class/object like this: (Just an example) @interface Gun : NSObject { NSString *name; // Six-shooter NSNumber *cost; NSNumber *clipPrice; // ie: 700 NSNumber *clipCapacity; // 6 NSNumber *ammoCapacity; // 6 NSNumber *damage; // 0-10 NSNumber *accuracy; // 0-10 NSNumber *fireRate; // 0-10 NSNumber *range; // 0-10 // Not sure if I have all the stats, but this is fine for now } Lets say I want to have 3 upgrades per gun. My problem is I am not sure how to do this. Examples: increase fire-rate increase range increase accuracy silencer double ammo capacity (ie: Drum) double clip capacity (ie: Taped magazine) Thus my question is, I'd like to implement an upgrade system to guns but I am not sure how to do it. Would there be an Upgrade object which is a child to the Gun class, or would it be seperate class altogether. Thanks for your time.

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• Solution for lightweight LAN peer discovering?

  - by DevilWithin

  I built a library for purely cross-platform programming. My games made with it run fine in Android , Pc, Linux, Mac etc. The networking capabilities are provided by ENET library, therefore all communication between my apps is not TCP or UDP compatible, but only in the custom protocol, even tough its based on the UDP ultimately. I don't think its possible to do what i want with ENET, thats why I ask here for help! Lets say I have the same game running in my Android phone, my laptop and my pc. They are all in the same wifi network, and therefore in a LAN, whether its Wifi hotspot(?) or the household router. I need each of those 3 peers to discover the other two in the network. This is meant only to find the IP of alive apps in the LAN network, to be able to host multiplayer games between them. I can only think of one effective way to do this, UDP broadcast, wait responses, but if that is the solution, i need something small, since its the only purpose of the implementation. Other way could be to try to connect to all IPs in the LAN address subrange, but I don't think the OS would be with me on this one :p Sorry for the long question!

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• Ubuntu does not recognize my built-in monitor.

  - by B3tturTh3nU

  I've recently discovered of a boot problem Ubuntu has with my laptop. I have successfully installed Ubuntu on two other computers, and I've never experienced this problem. What happens is, after the live boot CD loads, the screen goes completely blank. Although, I suspected that there was no problem booting, so I loaded with BIOS only, which worked perfectly fine. Of course, not being very proficient with this, I have no idea what needs to be done to fix the problem. I have switchable graphics cards(the ATI Mobility Radeon HD 5650, and some low-end Intel card), and an Intel i5 quad core processor. I was booting with the Ubuntu 10.10 64 bit desktop distribution. If there's any more information you need from me, please let me know. EDIT: I was able to look into this a bit more, thanks to one of the comments provided, and I have some new information. Ubuntu does seem to be able to recognize both of my graphics cards. The problem I found was that, in the Xorg.0 log, it mentions that there were "no screens found." I'm using a notebook, so the screen is built in. Does anyone know of a way to get Ubuntu to recognize the monitor?

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• IRQ Conflicts Causing Video Card and Boot Problems?

  - by sanpatricio

  tl;dr - I have 4 devices sharing 1 IRQ. Is this bad and how do I tell the BIOS to stop it? Background: I have an old Dell GX280 dual Pentium 4 that I (semi) resurrected last weekend with an installation of Ubuntu 12.04. Everything was going fine the first several hours until a problem that plagued me when WinXP was on that machine happened -- it froze. Completely froze. None of the myriad of ways I have found here on askubuntu helped me to regain control except a long-press of the power button to shut it off. Clearly, this wasn't a software/WinXP issue. After much googling, I found that hardware conflicts can often cause this sort of total lock-up and with all the odd blocks of yellow and flecks of color showing on my screen (both WinXP and Ubuntu) I figured my old GeForce 7600 was failing and causing me these odd issues. (A good canned-air dusting of the entire interior fixed the color fleck problem) Again, through much googling and numerous answers found on askubuntu, I somehow stumbled my way onto the lshw command. After going through it, line by line, I found that I have four devices sharing IRQ 16: eth0, wlan0, ide0 (DVD-RW), and my video card. In hindsight, I can recall weird instances of my Ethernet connection to another computer not working when I thought it should. I never full troubleshot those issues so it could be a coincidence. The other thing that has been plaguing me since installing Ubuntu (wasn't there during WinXP) has been periodic moments of my monitor getting no signal from Ubuntu during boot. The first couple days, it would disappear after the Dell boot screen and reappear at Ubuntu login. Now, it disappears after the Dell boot screen and doesn't return at all -- I have to hit F12 where I can load a safe mode version of Ubuntu and get more details like dmesg and lsdev. I also ran memtest86 overnight and woke up to zero errors, so failing RAM is out. Where do I go from here?

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• Presentation Plugin for NetBeans IDE 7.2

  - by Geertjan

  I got some excellent help from Mark Stephens, who is from IDR Solutions, which produces JPedal. Using the LGPL version of JPedal, and code provided by Mark, it's now possible to right-click the node that appears in the Presentation Window: ...after which, using a file browser (to locate a file on disk) or a URL (a very simple check is done, the URL must start with "http" and end with "pdf"), you can now open PDF files as images (thanks to conversion from PDF to images done by JPedal) into NetBeans IDE, typically (I imagine) for presentation purposes: Note that you should consider the plugin in "alpha" state. But, despite that, I've had good results. Try it and use the URL below, as a control test (since it works fine for me), which produces the result shown above: http://edu.netbeans.org/contrib/slides/netbeans-platform/presentation-4-actions.pdf  However, for some PDFs, the plugin doesn't work, and I don't know why yet (trying to figure it out with Mark), resulting in this stack trace: java.lang.ArrayIndexOutOfBoundsException: 8 at org.jpedal.objects.acroforms.formData.SwingData.completeField(Unknown Source) at org.jpedal.objects.acroforms.rendering.DefaultAcroRenderer.createField(Unknown Source) at org.jpedal.objects.acroforms.rendering.DefaultAcroRenderer.createDisplayComponentsForPage(Unknown Source) at org.jpedal.PDFtoImageConvertor.convert(Unknown Source) at org.jpedal.PdfDecoder.getPageAsImage(Unknown Source) at org.jpedal.PdfDecoder.getPageAsImage(Unknown Source) Here's the location of the plugin, install it into NetBeans IDE 7.2; feedback is very welcome: http://plugins.netbeans.org/plugin/44525

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