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  • Graduated transition from Green - Yellow - Red

    - by GoldBishop
    I have am having algorithm mental block in designing a way to transition from Green to Red, as smoothly as possible with a, potentially, unknown length of time to transition. For testing purposes, i will be using 300 as my model timespan but the methodology algorithm design needs to be flexible enough to account for larger or even smaller timespans. Figured using RGB would probably be the best to transition with, but open to other color creation types, assuming its native to .Net (VB/C#). Currently i have: t = 300 x = t/2 z = 0 low = Green (0, 255, 0) mid = Yellow (255, 255, 0) high = Red (255, 0, 0) Lastly, sort of an optional piece, is to account for the possibility of the low, mid, and high color's to be flexible as well. I assume that there would need to be a check to make sure that someone isnt putting in low = (255,0,0), mid=(254,0,0), and high=(253,0,0). Outside of this anomaly, which i will handle myself based on the best approach to evaluate a color. Question: What would be the best approach to do the transition from low to mid and then from mid to high? What would be some potential pitfalls of implementing this type of design, if any?

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  • Why is my root filesystem always scanned at boot?

    - by luri
    I always have a pause at boot saying my filesystems are being checked (with a "press C to cancel" note, too). Actually (seeing boot.log) I think it's the / fs, which is located at /dev/sdb5 Several questions altoghether, here (hope this does not break any rule): Is this normal? Can I (or even should I) prevent this anyhow? According to boot.log (below) the fs does not seem to be 'clean', or, at least, it's in an state or condition that makes fsck always can it for errors for a while (just a few seconds). How can I fix it? Edit: This is my boot.log: fsck desde util-linux-ng 2.17.2 udevd[515]: can not read '/etc/udev/rules.d/z80_user.rules' /dev/sdb5: 249045/32841728 ficheros (0.3% no contiguos), 20488485/131338752 bloques init: ureadahead-other main process (1111) terminated with status 4 init: ureadahead-other main process (1116) terminated with status 4 Password: * Starting AppArmor profiles [160G Skipping profile in /etc/apparmor.d/disable: usr.bin.firefox [154G[ OK ] * Setting sensors limits [160G [154G[ OK ] And this is dumpe2fs results for the filesystem being checked (well, the relevant part of the log): Filesystem volume name: <none> Last mounted on: / Filesystem UUID: 42509bf9-f3e6-460a-8947-ec0f5c1fbcc8 Filesystem magic number: 0xEF53 Filesystem revision #: 1 (dynamic) Filesystem features: has_journal ext_attr resize_inode dir_index filetype needs_recovery extent flex_bg sparse_super large_file huge_file uninit_bg dir_nlink extra_isize Filesystem flags: signed_directory_hash Default mount options: (none) Filesystem state: clean Errors behavior: Continue Filesystem OS type: Linux Inode count: 32841728 Block count: 131338752 Reserved block count: 6566937 Free blocks: 110850356 Free inodes: 32592701 First block: 0 Block size: 4096 Fragment size: 4096 Reserved GDT blocks: 992 Blocks per group: 32768 Fragments per group: 32768 Inodes per group: 8192 Inode blocks per group: 512 Flex block group size: 16 Filesystem created: Fri Dec 10 19:44:15 2010 Last mount time: Mon Feb 14 17:00:02 2011 Last write time: Mon Feb 14 16:59:45 2011 Mount count: 1 Maximum mount count: 33 Last checked: Mon Feb 14 16:59:45 2011 Check interval: 15552000 (6 months) Next check after: Sat Aug 13 17:59:45 2011 Lifetime writes: 331 GB Reserved blocks uid: 0 (user root) Reserved blocks gid: 0 (group root) First inode: 11 Inode size: 256 Required extra isize: 28 Desired extra isize: 28 Journal inode: 8 First orphan inode: 28049496 Default directory hash: half_md4 Directory Hash Seed: d3d24459-514b-4413-b840-e970b766095b Journal backup: inode blocks Journal features: journal_incompat_revoke Tamaño de fichero de transacciones: 128M Journal length: 32768 Journal sequence: 0x0005e0c4 Journal start: 1 This is the relevant (at least I think this is the fs being checked) line in fstab: #Entry for /dev/sdb5 : UUID=42509bf9-f3e6-460a-8947-ec0f5c1fbcc8 / ext4 errors=remount-ro 0 1

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  • Can't install Ubuntu on Asus Eee 1015pem

    - by Peter
    I'm having trouble to install Ubuntu. I use a ASUS Eee 1015pem netbook. Recently, I my netbook got wet. I had it inside my backback and all my things got wet. The netbook boots up fine but it will not load the OS. I downloaded ubuntu onto my external hard drive and changed the settings in my Bios to boot from a removable device. Nothing happens. When I plug in my external hard drive I'm not able to get to the boot icon. I have to unplug it the external hard drive. Set my boot settings I tried both Removable and CD-Rom. Than I plug my external drive back in and nothing happens on either settings. My Asus never came with a recovery disk and suppose to have a build in recovery by pressing F9 in the Bios. Also I need to disable Boot Booster in Bios and Boot Booster is not even an opition in Bios. My friend told me try installing Ubuntu but now I'm having no luck with Ubuntu. Any suggestions?

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  • Grub loading unknown file system grub rescue

    - by Ashish Kumar
    I am new to Linux. I had Windows 7 installed in my laptop. Yesterday I installed Ubuntu 9.0 from a free CD I got. I choose the option "Install side by side with Windows 7 loader (something like that..)". Everything went fine & I installed Ubuntu. When I restarted, I could easily boot from both Windows 7 & Ubuntu. But later when I booted from Windows 7, I did a disk management by right clicking "my Computer" & choosing the option "Manage". Actually I deleted a drive & added that empty volume in another drive. Now when I start my system it shows the following error: Grub loading Unknown file system grub rescue> I have no clue what to do now. Please help me at urgent. Any solution in layman's language is greatly appreciated. P.S. I want all my files on both Windows 7 & Ubuntu.

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  • Dividing up spritesheet in Javascript

    - by hustlerinc
    I would like to implement an object for my spritesheets in Javascript. I'm very new to this language and game-developement so I dont really know how to do it. My guess is I set spritesize to 16, use that to divide as many times as it fits on the spritesheet and store this value as "spritesheet". Then a for(i=0;i<spritesheet.length;i++) loop running over the coordinates. Then tile = new Image(); and tile.src = spritesheet[i] to store the individual sprites based on their coordinates on the spritesheet. My problem is how could I loop trough the spritesheet and make an array of that? The result should be similar to: var tile = Array( "img/ground.png", "img/crate.png" ); If possible this would be done with one single object that i only access once, and the tile array would be stored for later reference. I couldn't find anything similar searching for "javascript spritesheet". Edit: I made a small prototype of what I'm after: function Sprite(){ this.size = 16; this.spritesheet = new Image(); this.spritesheet.src = 'img/spritesheet.png'; this.countX = this.spritesheet.width / 16; this.countY = this.spritesheet.height / 16; this.spriteCount = this.countX * this.countY; this.divide = function(){ for(i=0;i<this.spriteCount;i++){ // define spritesheet coordinates and store as tile[i] } } } Am I on the right track?

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  • How to update MDS ?

    - by harsh.singla
    The other question that comes to mind is how to update and existing file or creates a new file in MDS. It's really simple. We already have setup done for this in Foundation Pack. Here are the steps you need to do to update or create a new file in MDS 1) Browse to AIA_HOME/AIAMetaData 2) Place your file(it may be new file or modified existing file) at the desired location. The same hierarchy will appear in MDS starting from AIAMetaData. 3) Edit UpdateMetaDataDeploymentPlan.xml in aia_instances/AIA_INSTANCE_NAME/config. 4) In the tag, mention the files which you have modified or added new. You can add a file or directory as required. 5) Browse to AIA_HOME/Infrastructure/Install/scripts 6) Run ant -f UpdateMetaData.xml Here is the same UpdateMetaData Deployment Plan. UpdateMetaDataDP.xml There are some things that you may want to take care while updating MDS 1) The path in "fileset" tag can be anywhere on the disk. 2) The path in "include" tag has to be relative to what is given in "fileset" tag 3) The path is MDS will appear what you have given in "include" tag. The path in this tag will automatically appended to /apps/AIAMetaData/.

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  • Problems installing Ubuntu on a vaio with SSD, GRUB installation failure

    - by Alberto
    I have installed and used Ubuntu in several computers. But now I have a problem that I don't know how to solve. I have a Vaio (Product name: vpcz13c5e), it has a SSD 128gb. I decided to install Ubuntu (12.04, but I have tried older versions as well). Firstly, I tested with live USB, and everything was fine, so I decided go for the complete installation. Then everything went as follows: I chose to use the whole disk (first option, formatting everything). I got a message Executing 'grub-install' /deb/sdb failed. This is a fatal error After clicking ok I got another window with 3 options: the first offers different devices to install the bootloader on (I tried all of them and none works). Second option: Continue without a bootloader. In that case I got You will need to manually install a bootloader in order to start Ubuntu The third option is Cancel the installation. So, I chose Continue without a bootloader. Then I restart the computer (with the Live cd) and in a terminal type sudo fdisk -l but I obtain fdisk: unable to seek on /dev/sda: Invalid argument What can I do? any help will be appreciated.

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  • How do I prevent my filesystems from being mounted read-only after suspending?

    - by Chas. Owens
    I have Ubuntu 12.04 installed on an SDHC card (only one ext2 partition, no swap). When I suspend using pm-suspend, my root filesystem is mounted read-only. I am currently "fixing" this with the following file: /etc/pm/sleep.d/99_make_disk_rw: #!/bin/sh mount -o remount,rw / But the disk is marked as needing an fsck on reboot. How can I prevent the filesystem from being mounted read-only or whatever is going wrong here. Update: It looks like it is getting mounted read-only because an error occurred. I have changed the mount options for / in /etc/fstab to noatime,nodiratime,errors=continue and it no longer mounts the SDHC card as read-only after it resumes. So the problem is happening when it suspends, not when it resumes as I had thought. I checked /sys/bus/usb/devices/1-4/power/persist and it is set to 1. So the SDHC card shouldn't appear disconnected to the OS (or more accurately it should recover from the disconnection without error). Here seems to be the relevant section of the syslog Sep 10 10:34:23 iubit kernel: [ 748.246226] sd 4:0:0:0: [sdb] Media Changed Sep 10 10:34:23 iubit kernel: [ 748.246234] sd 4:0:0:0: [sdb] Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE Sep 10 10:34:23 iubit kernel: [ 748.246243] sd 4:0:0:0: [sdb] Sense Key : Unit Attention [current] Sep 10 10:34:23 iubit kernel: [ 748.246253] Info fld=0x0 Sep 10 10:34:23 iubit kernel: [ 748.246258] sd 4:0:0:0: [sdb] Add. Sense: Not ready to ready change, medium may have changed Sep 10 10:34:23 iubit kernel: [ 748.246271] sd 4:0:0:0: [sdb] CDB: Read(10): 28 00 00 5d 3e f0 00 00 08 00 Sep 10 10:34:23 iubit kernel: [ 748.246291] end_request: I/O error, dev sdb, sector 6110960 Sep 10 10:34:23 iubit kernel: [ 748.247027] EXT2-fs (sdb1): error: ext2_fsync: detected IO error when writing metadata buffers Sep 10 10:34:23 iubit anacron[6954]: Anacron 2.3 started on 2012-09-10 Sep 10 10:34:23 iubit anacron[6954]: Normal exit (0 jobs run) Sep 10 10:34:24 iubit laptop-mode: Laptop mode Sep 10 10:34:24 iubit laptop-mode: enabled, not active Sep 10 10:34:24 iubit kernel: [ 749.055376] sd 4:0:0:0: [sdb] No Caching mode page present Sep 10 10:34:24 iubit kernel: [ 749.055387] sd 4:0:0:0: [sdb] Assuming drive cache: write through Sep 10 10:34:25 iubit anacron[7555]: Anacron 2.3 started on 2012-09-10 Sep 10 10:34:25 iubit anacron[7555]: Normal exit (0 jobs run) Sep 10 10:34:31 iubit kernel: [ 756.090861] EXT2-fs (sdb1): previous I/O error to superblock detected

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  • unable to install postgres for ubuntu

    - by ramya
    I am trying to install postgresql on ubuntu. I tried installing postgresql using apt-get install postgresql Reading package lists... Done Building dependency tree Reading state information... Done The following NEW packages will be installed: postgresql 0 upgraded, 1 newly installed, 0 to remove and 48 not upgraded. Need to get 0B/23.2kB of archives. After this operation, 57.3kB of additional disk space will be used. debconf: delaying package configuration, since apt-utils is not installed Selecting previously deselected package postgresql. (Reading database ... 42866 files and directories currently installed.) Unpacking postgresql (from .../postgresql_8.4.9-0ubuntu0.10.04_all.deb) ... Setting up postgresql (8.4.9-0ubuntu0.10.04) ... But postgresql is not installed properly. I tried purging and reinstalling it .But I am not able to find a solution. Please help we with this. Thanks, Ramya.

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  • Canon MG6100 series USB Printer not mounting

    - by user35201
    Printer MP6150 driver installed itself upon plugging in the printer. Printer is recognized (lsusb shows it) but does not mount. If the printer is recognized, the driver must be working (or?), but something is blocking the system from mounting the printer. Tried the usual things: power of printer, restart Ubuntu etc. Listed below result of lsusb and fstab: hans@kontor-linux:~$ lsusb Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 006 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 007 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 001 Device 004: ID 04a9:174a Canon, Inc. Bus 002 Device 002: ID 1058:1001 Western Digital Technologies, Inc. External Hard Disk [Elements] Bus 004 Device 002: ID 046d:c517 Logitech, Inc. LX710 Cordless Desktop Laser hans@kontor-linux:~$ sudo cat /etc/fstab [sudo] password for hans: # /etc/fstab: static file system information. # # Use 'blkid' to print the universally unique identifier for a # device; this may be used with UUID= as a more robust way to name devices # that works even if disks are added and removed. See fstab(5). # # <file system> <mount point> <type> <options> <dump> <pass> proc /proc proc nodev,noexec,nosuid 0 0 # / was on /dev/sda6 during installation UUID=eaf3b38d-1c81-4de9-98d4-3834d674ff6e / ext4 errors=remount-ro 0 1 # swap was on /dev/sda5 during installation UUID=93a667d3-6132-45b5-ad51-1f8a46c5b437 none swap sw 0 0

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  • Returning Value of Radio Button Jquery [migrated]

    - by Jerry Walker
    I am trying to figure out why, when I run this code, I am getting undefined for my correct answers. $(document).ready (function () { // var answers = [["Fee","Fi","Fo"], ["La","Dee","Da"]], questions = ["Fee-ing?", "La-ing?"], corAns = ["Fee", "La"]; var counter = 0; var $facts = $('#main_ .facts_div'), $question = $facts.find('.question'), $ul = $facts.find('ul'), $btn = $('.myBtn'); $btn.on('click', function() { if (counter < questions.length) { $question.text(questions[counter]); var ansstring = $.map(answers[counter], function(value) { return '<li><input type="radio" name="ans" value="0"/>' + value + '</li>'}).join(''); $ul.html(ansstring); var currentAnswers = $('input[name="ans"]:checked').map(function() { return this.val(); }).get(); var correct = 0; if (currentAnswers[counter]==corAns[counter]) { correct++; } } else { $facts.text('You are done with the quiz ' + correct); $(this).hide(); } counter++; }); // }); It is quite long and I'm sorry about that, but I don't really know how tostrip it down. I also realize this isn't the most elegant way to do this, but I just want to know why I can't seem to get my radio values. I will add the markup as well if anyone wants.

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  • JavaOne 2012 Conference Preview

    - by Janice J. Heiss
    A new article, by noted freelancer Steve Meloan, now up on otn/java, titled “JavaOne 2012 Conference Preview,” looks ahead to the fast approaching JavaOne 2012 Conference, scheduled for September 30-October 4 in San Francisco. The Conference will celebrate and highlight one of the world’s leading technologies. As Meloan states, “With 9 million Java developers worldwide, 5 billion Java cards in use, 3 billion mobile phones running Java, 1 billion Java downloads each year, and 100 percent of Blu-ray disk players and 97 percent of enterprise desktops running Java, Java is a technology that literally permeates our world.”The 2012 JavaOne is organized under seven technical tracks:* Core Java Platform* Development Tools and Techniques* Emerging Languages on the JVM* Enterprise Service Architectures and the Cloud* Java EE Web Profile and Platform Technologies* Java ME, Java Card, Embedded, and Devices* JavaFX and Rich User ExperiencesConference keynotes will lay out the Java roadmap. For the Sunday keynote, such Oracle luminaries as Cameron Purdy, Vice President of Development; Nandini Ramani, Vice President of Engineering, Java Client and Mobile Platforms; Richard Bair, Chief Architect, Client Java Platform; and Mark Reinhold, Chief Architect, Java Platform will be presenting.For the Thursday IBM keynote, Jason McGee, Distinguished Engineer and Chief Architect for IBM PureApplication System, and John Duimovich, Java CTO and IBM Distinguished Engineer, will explore Java and IBM's cloud-based initiatives.All in all, the JavaOne 2012 Conference should be as exciting as ever.Link to the article here. Originally published on blogs.oracle.com/javaone.

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  • JavaOne 2012 Conference Preview

    - by Janice J. Heiss
    A new article, by noted freelancer Steve Meloan, now up on otn/java, titled “JavaOne 2012 Conference Preview,” looks ahead to the fast approaching JavaOne 2012 Conference, scheduled for September 30-October 4 in San Francisco. The Conference will celebrate and highlight one of the world’s leading technologies. As Meloan states, “With 9 million Java developers worldwide, 5 billion Java cards in use, 3 billion mobile phones running Java, 1 billion Java downloads each year, and 100 percent of Blu-ray disk players and 97 percent of enterprise desktops running Java, Java is a technology that literally permeates our world.” The 2012 JavaOne is organized under seven technical tracks: * Core Java Platform* Development Tools and Techniques* Emerging Languages on the JVM* Enterprise Service Architectures and the Cloud* Java EE Web Profile and Platform Technologies* Java ME, Java Card, Embedded, and Devices* JavaFX and Rich User Experiences Conference keynotes will lay out the Java roadmap. For the Sunday keynote, such Oracle luminaries as Cameron Purdy, Vice President of Development; Nandini Ramani, Vice President of Engineering, Java Client and Mobile Platforms; Richard Bair, Chief Architect, Client Java Platform; and Mark Reinhold, Chief Architect, Java Platform will be presenting. For the Thursday IBM keynote, Jason McGee, Distinguished Engineer and Chief Architect for IBM PureApplication System, and John Duimovich, Java CTO and IBM Distinguished Engineer, will explore Java and IBM's cloud-based initiatives.All in all, the JavaOne 2012 Conference should be as exciting as ever. Link to the article here.

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  • Will BIOS boot mode Ubuntu install be able to boot when firmware "Fast Boot" is "Ultra Fast"?

    - by Pro Backup
    I have an AsRock mainboard with UEFI BIOS P1.50 02/14/2014. The firmware "Fast Boot" option is set to "Fast", Boot Option #1 is set to "AHCI P4: OCZ-VERT...": this is BIOS not UEFI boot. This boot disk has an MBR partitioning scheme (# parted -l | grep Partition\ Table:). Therefore Ubuntu 14.04 is installed in BIOS/CMS (Grub-PC) mode. The Ubuntu boot process ends in a text console (no GUI). There is no external graphics card in use. The stock Ubuntu kernel is replaced with Ubuntu supplied mainline 3.16.0-031600rc6-generic. dmesg outputs lines containing BIOS, like: SMBIOS 2.7 present Calgary: detecting Calgary via BIOS EBDA area Calgary: Unable to locate Rio Grande table in EBDA - bailing! [Firmware Bug]: ACPI: BIOS _OSI(Linux) query ignored BIOS EDD facility v0.16 2004-Jun-25, 0 devices found The ASRock BIOS it selves display this help text for "Ultra Fast - Fast Boot": Ultra Fast mode is only supported by Windows 8 and the VBIOS must support UEFI GOP if you are using an external graphics card. Please notice that Ultra Fast mode will boot so fast that the only way to enter this UEFI Setup Utility is to Clear CMOS or run the Restart to UEFI utility in Windows. Assumptions: I suspect after changing UEFI setting "Fast Boot" to "Ultra Fast" that the machine will no longer boot into Ubuntu's console. I expect when first exchanging "Grub-pc" with "Grub-efi", that the machine will still be able to boot to a grub menu (thus allowing to change the "Fast Boot" setting back to "Fast" without clearing CMOS). Are these two "Fast Boot" assumptions correct, and/or, may I expect Ubuntu 14.04 running mainline kernel 3.16rc6 and Grub-efi to still boot to console after enabling UEFI Ultra Fast Boot?

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  • Friday Tips #5

    - by Chris Kawalek
    Happy Friday, everyone! Following up on yesterday's post about Oracle VM VirtualBox being selected as the best virtualization solution for 2012 by the readers of Linux Journal, our Friday tip is about that very cool piece of software: Question: How do I move a VM from one machine to another with Oracle VM VirtualBox? Answer by Andy Hall, Product Management Director, Oracle Desktop Virtualization: There are a number of ways to do this, with pros and cons for each. The most reliable approach is to Export and Import virtual machines: From the VirtualBox manager, simply use the File…Export appliance menu and follow the wizard's lead. Move the resulting file(s) to the destination machine; and Import the VM into VirtualBox. This method will take longer and use more disk space than other methods because the configuration files and virtual hard drives are converted into an industry standard format (.ova or .ovf). But an advantage of this approach is that the creator of the virtual appliance can add a license which the importer will see and click-to-accept at import time. This is especially useful for ISVs looking to deliver pre-built, configured and tested appliances to their customers and prospects. Thanks Andy! Remember, if you have a question for us, use Twitter hashtag #AskOracleVirtualization. We'll see you next week! -Chris 

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  • Jump handling and gravity

    - by sprawl
    I'm new to game development and am looking for some help on improving my jump handling for a simple side scrolling game I've made. I would like to make the jump last longer if the key is held down for the full length of the jump, otherwise if the key is tapped, make the jump not as long. Currently, how I'm handling the jumping is the following: Player.prototype.jump = function () { // Player pressed jump key if (this.isJumping === true) { // Set sprite to jump state this.settings.slice = 250; if (this.isFalling === true) { // Player let go of jump key, increase rate of fall this.settings.y -= this.velocity; this.velocity -= this.settings.gravity * 2; } else { // Player is holding down jump key this.settings.y -= this.velocity; this.velocity -= this.settings.gravity; } } if (this.settings.y >= 240) { // Player is on the ground this.isJumping = false; this.isFalling = false; this.velocity = this.settings.maxVelocity; this.settings.y = 240; } } I'm setting isJumping on keydown and isFalling on keyup. While it works okay for simple use, I'm looking for a better way handle jumping and gravity. It's a bit buggy if the gravity is increased (which is why I had to put the last y setting in the last if condition in there) on keyup, so I'd like to know a better way to do it. Where are some resources I could look at that would help me better understand how to handle jumping and gravity? What's a better approach to handling this? Like I said, I'm new to game development so I could be doing it completely wrong. Any help would be appreciated.

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  • MAAS/JuJu Clarifications

    - by ectoskeleton
    I really love the concept of MAAS underlying an OpenStack implementation, but there are a few questions about MAAS that I am not entirely clear on. Should all hosts be set to network boot at all times or after they have been registered and allocated as a service, should they boot to disk? After juju bootstrap is executed, I turn on the machine that has been allocated (note WoL isn't working, I suspect it's being blocked on the network), the machine boot's up and then juju status executes correct, agent running and all that good stuff. If I 'reboot' the machine (testing power failure/problem whatever), juju status comes back but the agent-state is no longer in running state, and so far I have to destroy the environment and restart. In all cases I have never been able to deploy any services to any of the other nodes. I deploy the service with juju, note which node it was assigned, and then start the system. The system just boots up into a basic node. If I SSH to it I have to enter password, so it's not setting up the ssh key or anything. This is on Ubuntu 12.04.1 LTS systems and HP GL360G7 hosts. The MAAS management server is running as a VM but all on the same network. At this point I am not sure if I am doing something wrong or if there is a problem somewhere else. Is the idea that anytime a host is rebooted it should be rebuilt from the ground up, or is something else going on behind the scene to tell it to boot the local image. If the latter, why doesn't the agent start on a system that has been successfully setup before (juju bootstrapped system)?

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  • Actually utilizing relational databases for entity systems

    - by Marc Müller
    Recently I was researching several entity systems and obviously I came across T=Machine's fantastic articles on the subject. In Part 5 of the series the author uses a relational schema to explain how an entity system is built and works. Since reading this, I have been wondering whether or not actually using a compact SQL library would be fast enough for real-time usage in video games. Performance seems to be the main issue with a full blown SQL database for management of all entities and components. However, as mentioned in T=Machine's post, basically all access to data inside the SQLDB is done sequentlially by each system over each component. Additionally, using a library like SQLite, one could easily improve performance by storing the entity data exclusively in RAM to increase access speeds. Disregarding possible performance issues, using a SQL database, in my opinion, would allow for a very intuitive implementation of entity systems and bring a long certain other benefits like easy de/serialization of game states and consistency checks like the uniqueness of entity IDs. Edit for clarification: The main question was whether using a SQL database for the actual entity management (not just storing the game state on the disk) in a real-time game would still yield a framerate appropriate for a game or even if someone is aware of projects that demonstrate SQL in a video game.

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  • How do I draw a single Triangle with XNA and fill it with a Texture?

    - by Deukalion
    I'm trying to wrap my head around: http://msdn.microsoft.com/en-us/library/bb196409.aspx I'm trying to create a method in XNA that renders a single Triangle, then later make a method that takes a list of Triangles and renders them also. But it isn't working. I'm not understanding what all the things does and there's not enough information. My methods: // Triangle is a struct with A, B, C (didn't include) A, B, C = Vector3 public static void Render(GraphicsDevice device, List<Triangle> triangles, Texture2D texture) { foreach (Triangle triangle in triangles) { Render(device, triangle, texture); } } public static void Render(GraphicsDevice device, Triangle triangle, Texture2D texture) { BasicEffect _effect = new BasicEffect(device); _effect.Texture = texture; _effect.VertexColorEnabled = true; VertexPositionColor[] _vertices = new VertexPositionColor[3]; _vertices[0].Position = triangle.A; _vertices[1].Position = triangle.B; _vertices[2].Position = triangle.B; foreach (var pass in _effect.CurrentTechnique.Passes) { pass.Apply(); device.DrawUserIndexedPrimitives<VertexPositionColor> ( PrimitiveType.TriangleList, _vertices, 0, _vertices.Length, new int[] { 0, 1, 2 }, // example has something similiar, no idea what this is 0, 3 // 3 = gives me an error, 1 = works but no results ); } }

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  • Securely automount encrypted drive at user login

    - by Tom Brossman
    An encrypted /home directory gets mounted automatically for me when I log in. I have a second internal hard drive that I've formatted and encrypted with Disk Utility. I want it to be automatically mounted when I login, just like my encrypted /home directory is. How do I do this? There are several very similar questions here, but the answers don't apply to my situation. It might be best to close/merge my question here and edit the second one below, but I think it may have been abandoned (and therefore never to be marked as accepted). This solution isn't a secure method, it circumvents the encryption. This one requires editing fstab, which necessitates entering an additional password at boot. It's not automatic like mounting /home. This question is very similar, but does not apply to an encrypted drive. The solution won't work for my needs. Here is one but it's for NTFS drives, mine is ext4. I can re-format and re-encrypt the second drive if a solution requires this. I've got all the data backed up elsewhere.

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  • Design guideline for saving big byte stream in c# [migrated]

    - by Praveen
    I have an application where I am receiving big byte array very fast around per 50 miliseconds. The byte array contains some information like file name etc. The data (byte array ) may come from several sources. Each time I receive the data, I have to find the file name and save the data to that file name. I need some guide lines to how should I design it so that it works efficient. Following is my code... public class DataSaver { private static Dictionary<string, FileStream> _dictFileStream; public static void SaveData(byte[] byteArray) { string fileName = GetFileNameFromArray(byteArray); FileStream fs = GetFileStream(fileName); fs.Write(byteArray, 0, byteArray.Length); } private static FileStream GetFileStream(string fileName) { FileStream fs; bool hasStream = _dictFileStream.TryGetValue(fileName, out fs); if (!hasStream) { fs = new FileStream(fileName, FileMode.Append); _dictFileStream.Add(fileName, fs); } return fs; } public static void CloseSaver() { foreach (var key in _dictFileStream.Keys) { _dictFileStream[key].Close(); } } } How can I improve this code ? I need to create a thread maybe to do the saving.

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  • Cannot boot into ubuntu 12.10

    - by sriram
    Below given are the steps which I followed to install ubuntu 12.10 with existing windows 8 in my machine. I downloaded ubuntu 12.10 into my disk and made it bootable from my usb by selecting that iso file. Then restared my mahine and in BIOS I selected boot from usb. Went into Linux os and selected install ubuntu alongside windows 8. It asked for memory allocation and I selected 550 GB for Ubuntu and 404GB for Windows. After that it completed ubuntu installation. The booted into my windows 8 and used easyBCD to add a new entry. Ubuntu grup2 Now the easyBCD shows, There are a total of 4 entries listed in the bootloader. Default: Windows 8 Timeout: 10 seconds EasyBCD Boot Device: C:\ Entry #1 Name: Lenovo Recovery System BCD ID: {e58d0cb6-2eae-11e2-9d20-806e6f6e6963} Device: \Device\HarddiskVolume3 Bootloader Path: \EFI\Microsoft\Boot\LrsBootMgr.efi Entry #2 Name: EFI USB Device BCD ID: {e58d0cb5-2eae-11e2-9d20-806e6f6e6963} Device: Unknown Bootloader Path: Entry #3 Name: Windows 8 BCD ID: {current} Drive: C:\ Bootloader Path: \windows\system32\winload.efi Entry #4 Name: Ubuntu 12.10 BCD ID: {6f173570-3bce-11e2-be74-c0143dd589c0} Drive: C:\ Bootloader Path: \NST\AutoNeoGrub0.mbr Next I restarted my system and in the boot options it shows windows 8 and ubuntu 12.10 When I click on ubuntu it displays, \NST\AutoNeoGrub0.mbr status 0xc000007b The application or operating system cold not be loaded because a required file is missing or contains errors. Can you help me resolve this... Thanks :)

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  • How to make a btrfs snapshot?

    - by MountainX
    My /home partition consists of an entire physical disk. It is formatted as btrfs. I want to snapshot it. I'm confused regarding subvolume naming, in particular. I am aware that there are similar questions, but each similar question seems to be asking something different from what I'm asking (and they are older, which means probably outdated, given the rapid development of btrfs). For example, the answer to this question is apparently not the answer to my question because my /home partition is a separate volume and the man page for btrfs shows a different command for creating snapshots now. another similar problem, no solid solution. someone else as confused as me on the naming issues My question: Starting simple: is this the correct command to take a simple snapshot of my home partition? btrfs subvolume snapshot /home/@home /home/@home_snapshot_20120421 I got really brave and tested it and it does not work. The error is error accessing /home/@home. As shown below, @home is listed. I'm obviously confused on subvolume names. Do I need to use them in creating snapshots? Some examples show taking snapshots of home using /home as the source parameter, but based on examples of root volumes, it seems to me that I need to use /home/@home. Would this command work? And if not, why? btrfs subvolume snapshot /home /home/@home_snapshot_20120421 Is the @ just a naming convention? Is it meaningful at all? Here's some output that may be relevant: btrfs subvolume list /home ID 256 top level 5 path @home I'm not sure what that means, exactly. When I try btrfs device scan it gives an error (e.g. unable to scan the device /dev/sda1). My file system doesn't have any errors. Everything is fine.

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  • Dependency injection: what belongs in the constructor?

    - by Adam Backstrom
    I'm evaluating my current PHP practices in an effort to write more testable code. Generally speaking, I'm fishing for opinions on what types of actions belong in the constructor. Should I limit things to dependency injection? If I do have some data to populate, should that happen via a factory rather than as constructor arguments? (Here, I'm thinking about my User class that takes a user ID and populates user data from the database during construction, which obviously needs to change in some way.) I've heard it said that "initialization" methods are bad, but I'm sure that depends on what exactly is being done during initialization. At the risk of getting too specific, I'll also piggyback a more detailed example onto my question. For a previous project, I built a FormField class (which handled field value setting, validation, and output as HTML) and a Model class to contain these fields and do a bit of magic to ease working with fields. FormField had some prebuilt subclasses, e.g. FormText (<input type="text">) and FormSelect (<select>). Model would be subclassed so that a specific implementation (say, a Widget) had its own fields, such as a name and date of manufacture: class Widget extends Model { public function __construct( $data = null ) { $this->name = new FormField('length=20&label=Name:'); $this->manufactured = new FormDate; parent::__construct( $data ); // set above fields using incoming array } } Now, this does violate some rules that I have read, such as "avoid new in the constructor," but to my eyes this does not seem untestable. These are properties of the object, not some black box data generator reading from an external source. Unit tests would progressively build up to any test of Widget-specific functionality, so I could be confident that the underlying FormFields were working correctly during the Widget test. In theory I could provide the Model with a FieldFactory() which could supply custom field objects, but I don't believe I would gain anything from this approach. Is this a poor assumption?

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  • Reading OpenDocument spreadsheets using C#

    - by DigiMortal
    Excel with its file formats is not the only spreadsheet application that is widely used. There are also users on Linux and Macs and often they are using OpenOffice and other open-source office packages that use ODF instead of OpenXML. In this post I will show you how to read Open Document spreadsheet in C#. Importer as example My previous post about importers showed you how to build flexible importers support to your web application. This post introduces you practical example of one of my importers. Of course, sensitive code is omitted. We start with ODS importer class and we add new methods as we go. public class OdsImporter : ImporterBase {     public OdsImporter()     {     }       public override string[] SupportedFileExtensions     {         get { return new[] { "ods" }; }     }       public override ImportResult Import(Stream fileStream, long companyId, short year)     {         string contentXml = GetContentXml(fileStream);           var result = new ImportResult();         var doc = XDocument.Parse(contentXml);           var rows = doc.Descendants("{urn:oasis:names:tc:opendocument:xmlns:table:1.0}table-row").Skip(1);           foreach (var row in rows)         {             ImportRow(row, companyId, year, result);         }           return result;     } } The class given here just extends base class for importers (previous post uses interface but as I already told there you move to abstract base class when writing code for real projects). Import method reads data from *.ods file, parses it (it is XML), finds all data rows and imports data. As you may see then first row is skipped. This is because the first row on my sheet is always headers row. Reading ODS file Our import method starts with getting XML from *.ods file. ODS files like OpenXml files are zipped containers that contain different files. We need content.xml as all data is kept there. To get the contents of file we use SharpZipLib library to read uploaded file as *.zip file. private static string GetContentXml(Stream fileStream) {     var contentXml = "";       using (var zipInputStream = new ZipInputStream(fileStream))     {         ZipEntry contentEntry = null;         while ((contentEntry = zipInputStream.GetNextEntry()) != null)         {             if (!contentEntry.IsFile)                 continue;             if (contentEntry.Name.ToLower() == "content.xml")                 break;         }           if (contentEntry.Name.ToLower() != "content.xml")         {             throw new Exception("Cannot find content.xml");         }           var bytesResult = new byte[] { };         var bytes = new byte[2000];         var i = 0;           while ((i = zipInputStream.Read(bytes, 0, bytes.Length)) != 0)         {             var arrayLength = bytesResult.Length;             Array.Resize<byte>(ref bytesResult, arrayLength + i);             Array.Copy(bytes, 0, bytesResult, arrayLength, i);         }         contentXml = Encoding.UTF8.GetString(bytesResult);     }     return contentXml; } If here is content.xml file then we stop browsing the file. We read this file to memory and return it as UTF-8 format string. Importing rows Our last task is to import rows. We use special method for this as we have to handle some tricks here. To keep files smaller the cell count on row is not always the same. If we have more than one empty cell one after another then ODS keeps only one cell for sequential empty cells. This cell has attribute called number-columns-repeated and it’s value is set to the number of sequential empty cells. This is why we use two indexers for cells collection. private void ImportRow(XElement row, ImportResult result) {     var cells = (from c in row.Descendants()                 where c.Name == "{urn:oasis:names:tc:opendocument:xmlns:table:1.0}table-cell"                 select c).ToList();       var dto = new DataDto();       var count = cells.Count;     var j = -1;       for (var i = 0; i < count; i++)     {         j++;         var cell = cells[i];         var attr = cell.Attribute("{urn:oasis:names:tc:opendocument:xmlns:table:1.0}number-columns-repeated");         if (attr != null)         {             var numToSkip = 0;             if (int.TryParse(attr.Value, out numToSkip))             {                 j += numToSkip - 1;             }         }           if (i > 30) break;         if (j == 0)         {             dto.SomeProperty = cells[i].Value;         }         if (j == 1)         {             dto.SomeOtherProperty = cells[i].Value;         }         // some more data reading     }       // save data } You can define your own class for import results and add there all problems found during data import. Your application gets the results and shows them to user. Conclusion Reading ODS files may seem to complex task but actually it is very easy if we need only data from those documents. We can use some zip-library to get the content file and then parse it to XML. It is not hard to go through the XML but there are some optimization tricks we have to know. The code here is safe to use in web applications as it is not using any API-s that may have special needs to server and infrastructure.

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