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• Building a touch event driven UI from scratch: what algorithms or data types?

  - by user1717079

  I have a touch display. As input I can receive the coordinates and how many touch points are in use, basically I just get an X,Y couple for every touch event/activated point at a customizable rate. I need to start from this and build my own callback system to achieve something like Object.onUp().doSomething() meaning that I would like to abstract just the detection of some particular movements and not having to deal with raw data: what algorithms can be useful in this case? What statements? Is there some C++ library that I can dissect to get some useful info? Would you suggest the use of an heuristic algorithm?

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• Unity Gone, have tried everything 12.04

  - by Darrin

  Hello I have checked a few forums and tried much of the advice given, however nothing has worked so far. I dont know how it happened but when I boot up, I get the login screen to select user and once I select my user and input pw my screen displays my background inage but never loads cairo dock or the unity sidebar. I have tried unity --reset from tty1 and get asked if im actually trying to do a reset from a tty. I have also tried ctrl+ alt + T after logging in to get a terminal and tried to open ccsm to restart unity from there and that has not worked either. Any ideas?.....Thank You in advance for any help you can offer. Darrin

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• Why is n given the initial value of 1 in this loop?

  - by notypist

  From Kochan's "Programming in C": Input: printf ("TABLE OF TRIANGULAR NUMBERS\n\n"); printf (" n Sum from 1 to n\n"); printf ("--- ---------------\n"); triangularNumber = 0; for(n=1; n<=10; ++n){ triangularNumber += n; ? printf (" %i", n); } Output (only partly pasted): TABLE OF TRIANGULAR NUMBERS n = 1 Sum from 1 to n = 1 n = 2 Sum from 1 to n = 2 Question: I understand the purpose of this, but here's what I can't get my head around: If within the loop we assign an initial value of "1" to "n", then we check if n<=10, and if that's true (which it should be with the initial value), we then add "1" to n. Shouldn't (and I know it shouldn't, just don't understand why) the initial value displayed in our table be n=2 ? Thanks in advance for your patience and effort!

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• Problems increasing root size

  - by user212866

  I'm running out of space, so I tried to increase root size using this link: Increase size of root partition after installing Ubuntu in Windows Here is the output Filesystem Type Size Used Avail Use% Mounted on /dev/sda7 ext4 6,2G 5,6G 308M 95% / udev devtmpfs 965M 4,0K 965M 1% /dev tmpfs tmpfs 389M 892K 388M 1% /run none tmpfs 5,0M 4,0K 5,0M 1% /run/lock none tmpfs 972M 440K 971M 1% /run/shm /dev/sda5 fuseblk 12G 6,1G 5,8G 52% /media/Ubuntu /dev/sda2 fuseblk 278G 260G 19G 94% /media/AC4CC70D4CC6D16E I tried to allocate 16Gb in the host (/dev/sda2 which is windows 7 partition). When I get to the \ubuntu\disks folder, I only get the "new.disk" file which weighs the 16Gb allocated and not the "root.disk" file too. Also, the /dev/sda7 size doesn't increase. Could you please help me? Many thanks

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• How do I login to Sphider?

  - by dayuloli

  Has anyone else here used Sphider? I am able to install everything (exactly as instructed here)and change the password, but unable to login at the login screen. Whenever I login, it just refreshes the page, whether the credentials are correct or not. I have looked at the forum and others have the same problem too, but no one has provided a solution. So if any of you have tried Sphider and had the same problem your input would be much appreciated. Running version 1.3.6 Path to admin page is 'sphider-1.3.6/admin/admin.php' PHP Version 5.3.13 MySQL Version 5.0.91-log

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• Make recovery disk for customers

  - by alexander7567

  I hear about other computer shops that sells customers recovery disks that they have created. I'm assuming all that they do is make a image and uses an automation script that allows this to be done. I have seen where clonezilla does this, but it has to be the same HDD size or they might have problems down the road. Is there any other freeware that I could do this with that allows you to use on any size disk. Ghost is really good for this because it automatically fills up empty space with the partition and never needs any user input or "Expert Mode" like clonezilla. But it is not freeware.

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• How to have the game world get rendered on just a part of the screen?

  - by VictorB

  I am implementing a game on both Desktop and Android. The Desktop version will just rely on the keyboard to handle the user input on the game screen, whilst the Android one will have to have a set of buttons placed in a bar at the bottom of the game screen, using a Stage. Consequently, I am expecting the game world to take up the entire space available on the Desktop screen, whilst on Android it should expand to the entire width of the screen, and to the screen height minus the height of the buttons bar I've mentioned. What would be an appropriate approach of handling space sharing between the game world and the buttons bar? Thank you.

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• why opening a port is so difficult in ubuntu?

  - by icn

  I have searched around and I have run these commands iptables -A INPUT -p tcp -d 0/0 -s 0/0 --dport 5432 -j ACCEPT iptables-save > /etc/iptables.rules And I rebooted the box. I had no luck. What am I missing? IS there a universal way to do this thing in ubuntu? I remember in fedora I just need to edit a text file and make it happen. Thanks UPDATE I have run ufw allow 5432 and I ran ufw status I got this result Status: active To Action From -- ------ ---- 5432/tcp ALLOW Anywhere 80 ALLOW Anywhere 22 ALLOW Anywhere 5432 ALLOW Anywhere 5432/tcp ALLOW Anywhere (v6) 80 ALLOW Anywhere (v6) 22 ALLOW Anywhere (v6) 5432 ALLOW Anywhere (v6) I still cannot access 5432!

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• Problem with Nvidia after update

  - by user214673

  After adding the most recent set of updates, I can't get into Ubuntu at all. I get a screen saying that I am running in low-graphics mode, 'your screen, graphics card and input device settings could not be detected correctly etc'. I can hit return and then get to the next screen saying 'what would you like to do?' however, i can't choose from the 4 options, the only keystroke that will register is escape, which takes me to a black screen with a login. I have an Nvidia GeForce 7050/nForce 610i and it has caused problems in the past, but I have always got round it by choosing to boot in recovery mode. Now, no matter which version I try to boot into I can't get into Ubuntu at all.

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• A c++ program that computes the min and max of f(x) for a rectangle inputed by user

  - by StreetBallerX

  So bassicly this is the problem quoted from my teacher : "You have to write a program in C++ that computes the minimal and the maximal value of function f(x,y) obtained on an integer point in a given rectangle [a, b] x [c, d]. Your program should prompt the user to input numerical values of a, b, c and d, as floating point numbers, which are expected to be in a range from -100 thru 100. In case when minimal or maximal values do not exists, your program should output appropriate messages. f(x,y)=x+x*x+x*x*x+y+y*y " So before anyone tell me that i should try do it myself , i'll tell them that ive been trying to do it myself for the past 8 days but my deadline is aproaching and i just cant figure it out its a really simple program but i just cant understand it ... I wont post my attempts because all i saw in these forums is that when someone posts their try and a milion people start to say dont look it this way thry this and bla bla and the guy who posted it was just wondering for minor thing ... so what ever thank you all in advance and thats it :)

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• Storing and reading file paths from _TCHAR *argv[]

  - by ArsenArsen

  How to convert from _TCHAR* to "" and to keep all : and /? I tried: int _tmain(int argc, _TCHAR* argv[]) { if(!argv[1]){ std::cout<<"No Variables.\r\n"; system("PAUSE"); return 0; std::exit; } std::cout<<"Path: "<<argv[1]<<"\r\n"; system("PAUSE"); return 0; } But, output is either "No variables." or "Path: C" (when I changed _TCHAR to const char and char) or either "Path: 00038706"

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• Entity System and rendering

  - by hayer

  Okey, what I know so far; The entity contains a component(data-storage) which holds information like; - Texture/sprite - Shader - etc And then I have a renderer system which draws all this. But what I don't understand is how the renderer should be designed. Should I have one component for each "visual type". One component without shader, one with shader, etc? Just need some input on whats the "correct way" to do this. Tips and pitfalls to watch out for.

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• Learning MySQL Query optimization

  - by recluze

  I've been doing web/desktop/server development for a while and have worked with many databases (mysql mostly). I've come to the point in my career when I need to have someone look at my queries because they're 'kind of slow'. I believe it's now time to start learning query optimization. While I know the basics of index and joins etc., I'm not familiar with how to use, say, the EXPLAIN output to improve performance of my queries. I have not been able to find any online material that starts with the basics and takes me to application. Getting a book is not an option right now so I'm looking for tips about how to proceed with this. I hope this question is general enough not to get closed.

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• Maxtor OneTouch Hardisk Not Recognised

  - by user8960

  I have a Maxtor OneTouch External Harddisk 160gb that i purchased recently. At first my Ubuntu 10.10 could not mount it. I opened disk utility which recognized it but with no filesystem. I proceeded to try formatting it but this error popped up Blockquote Error creating partition table: helper exited with exit code 1: Error calling fsync(2) on /dev/sdb: Input/output error Blockquote I resorted to Gparted. Things turned worse; it wasn't even listed in the list of devices. Does anyone have a solution to this problem? Any help is appreciated.

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• Drivers for GeForce 7300 GS?

  - by user1443346

  I have been searching EVERYWHERE!!!!! And I cannot seem to find a driver for my GeForce 7300 GS video card. If I don't get it, the Android SDK emulator won't work. I get this error while starting the emulator up: X Error of failed request: BadRequest (invalid request code or no such operation) Major opcode of failed request: 154 (GLX) Minor opcode of failed request: 19 (X_GLXQueryServerString) Serial number of failed request: 12 Current serial number in output stream: 12 I looked up anything and everything, and the results I got was to get a video card driver, which I can not find. Any help is appreciated. Thanks!

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• Weird sound problems after upgrading to 13.10 (macbook)

  - by Atsch

  I have been having a very weird problem with my sound lately: 1)My right channel is extremely disorted with relativly loud noises, tested with several headphones. 2) After a while, wiered noises start coming from my speakers 3) playing lots of sounds at once causes the the output to become really mushed, e.g. in lmms or games. all points to a: a fault in my sound card, or b: a fault in alsa or pulseaudio, but I don't know how to find out. I will now try using the alsa-daily, and edit this away depending on my results after a restart

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• How can I redirect the contents of a file to the pastebinit command? [duplicate]

  - by Tim

  This question already has an answer here: How to submit a file to paste.ubuntu.com without graphical interface? 2 answers Whenever I was to store something to show someone here, I run command-with-output | pastebinit. That returns the link to the paste online. For example: echo timtjtim | pastebinit gave me the link paste.ubuntu.com/8010000 Which I can share. How can I do this with a file - for example a log file. Surely I don't have to open - > copy all - > open paste.ubuntu.com -> paste it?

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• Is this a reliable method of parsing glGetShaderInfoLog()?

  - by m4ttbush

  I want to get a list of errors and their line numbers so I can display the error information differently from how it's formatted in the error string and also to show the line in the output. It looks easy enough to just parse the result of glGetShaderInfoLog(), look for ERROR:, then read the next number up to :, and then the next, and finally the error description up to the next newline. However, the OpenGL docs say: Application developers should not expect different OpenGL implementations to produce identical information logs. This makes me worry that my code may behave incorrectly on different systems. I don't need them to be identical, I just need them to follow the same format. So is there a better way to get a list of errors with the line number separate, is it safe to assume that they'll always follow the "ERROR: 0:123:" format, or is there simply no reliable way to do this?

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• Ubuntu 11.10 boot: xhost: unable to open display

  - by paulus_almighty

  I've had this papercut for a while now, it's time it was fixed. When I boot up Ubuntu, choosing "Ubuntu...generic" from the grub screen, Ubuntu fails to load. It just sits at the driver/module loading screen. What seems to be the most significant line in this output is "xhost: unable to open display" If I choose "Ubuntu...(recovery mode)" from grub then it loads OK. I don't get why this is. Out of interest I tried enabling boot error logging with #/etc/default/bootlogd BOOTLOGD_ENABLE=Yes but I'm not seeing anything in that file. ETA: I've had this problem since fresh install of 11.10. Here's lshw: $ sudo lshw -C display *-display description: VGA compatible controller product: GF104 [GeForce GTX 460] vendor: nVidia Corporation physical id: 0 bus info: pci@0000:03:00.0 version: a1 width: 64 bits clock: 33MHz capabilities: pm msi pciexpress vga_controller bus_master cap_list rom configuration: driver=nvidia latency=0 resources: irq:16 memory:f6000000-f7ffffff memory:e0000000-e7ffffff memory:ec000000-efffffff ioport:bf00(size=128) memory:e8000000-e807ffff

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• Android / IPhone / Desktop C++ Game Template

  - by OriginalDaemon

  I was wondering if anyone has come across any articles detailing how to set up a basic game in C++ for use in Android / IPhone / Desktop applications. My thoughts just now are that I would like to make my game as a library and have a different project for each device which just interfaces with this library. You know the kind of thing, bootstrap the program, call some library initialize, load and run routines and occasionally pass some information to the library like input. I was hoping someone would have made a template for this kind of thing but I just had no luck finding one. It seems to me that it's the kind of thing you really only have to do once, so I was hoping someone would have done it for me already.

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• Separate parts of a game engine [on hold]

  - by user272716

  I'm pretty new in developing videogames. By now I only used SDL with C/C++ to create games. I'm currently learning OpenGL and I realized that to be fluid and easy to maintain the code must be logically separated. Since I want to use OpenGLES on iOS and Android I was wondering how the engine must be imagined in a technical way, some questions came up: Do I have to separate input/update functions from draw functions in different threads? Is there only one proper way to think a game engine/loop? What kind of assets should I use to create a 3D game using openGl ES to get better performance?

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• Problem with currency formats and big numbers [on hold]

  - by user132750

  I am working on a dollars to euros/euros to dollars converter in C#. I got the formula, $ times 0.73361 = euro, and I have checked Google with the answers. They were right, (1 dollar equals 0.73 euros). However, it stops working properly when the dollar input value is higher than $1363. This is what I get with $1364: $1364 = 1 000,64 €. I don't know what to do, will someone please help me? Thanks. decimal toEuro; Val.doy = "$" + decimal.Parse(richTextBox1.Text); //Ignore this, it's for the output form CultureInfo eu = new CultureInfo("fr-FR"); toEuro = decimal.Parse(richTextBox1.Text.Trim()); toEuro = toEuro * 0.73361m; richTextBox1.Clear(); Val.duh = toEuro.ToString("C2", eu);

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• How should i learn to make a game in c++ [on hold]

  - by Foo

  I been having a lot of trouble making a game by myself in c++. I know c++, I know how to implement anything I just don't know how to make all the classes work into a game it just turn into a lot of useless coding and the game never get off the basic drawing, input etc. I read sfml game developemt and the choice the author make are working and I say to myself "I would have never thought of making a scene node class and doing x that way" I just think I can't put my thoughts into working classes and make them communite the right way and make it work. Any help. Sorry I got bad English and I am not a native English speaker. And a grammar edits are welcome and tag fixing.

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• Do games use threads?

  - by Nubcake

  I understand that the concept of how a game runs i.e while (game_loop = true) { //handle events // input/output/sound etc } But it has come to my attention while programming in another HLL is do some games use threads for certain operations? For example take any Pokemon game ; during interaction a textbox appears to display information. Now I've been trying to simulate that sort of textbox and the only way I could have got it to be exactly the same is by using a loop and yes once a loop is started there is no way to handle window events unless they are handled again inside the loop itself. I couldn't have used this loop inside a different thread other than the main one (due to a DirectX limitation) so the only option was to use it inside the main program thread. I was wondering if some games work like this ; do they only use the main program thread and handle events again if they're inside a loop? Edit: I forgot to mention this is about console games not PC games! Thanks Nubcake

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• Can't boot after disk error 12.10

  - by user1189907

  Lately, I've been having Ubuntu crashing randomly.. it goes into read only mode, but once I restart it's working again. Today it happened again and I had to manually shut the computer down. Now I'm not able to boot anymore. I get the following when turning the computer on: error: unknown filesystem And I'm left at "grub rescue". I booted from the Live CD and installed "boot-repair". When I run it it says "no os has been found on this computer", it gives me no option to carry out any fixes. Boot Repair generated the following output which shows some errors: http://paste.ubuntu.com/1348224/ Any idea on how to fix this?

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