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• Mouse pointer position to screen space

  - by Ylisar

  If I have a mouse pointer position in pixels of canvas, I can easily convert it to the -1..1 range for both X & Y by lerping by dividing with canvas dimensions. However, the problem is what I should put in Z & W if I want my screen space position to be on the near plane? The step afterwards would be for me to multiply by the inverse of…

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• Problems after upgrading to 14.04 (only background and pointer after login)

  - by fabikw

  After upgrading from 12.04 to 14.04 I could log in to my X session (albeit with really low graphics). While trying to fix the graphics, I managed to break the X session. Now, after typing my password in the unity-greeter, the items disappear and I can only see the desktop background and the pointer. This happens for every user. I can still…

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• Rotate 2d sprite towards pointer

  - by Phil

  I'm using Crafty.js and am trying to point a sprite towards the mouse pointer. I have a function for getting the degree between two points and I'm pretty sure it works mathematically (I have it under unit tests). At least it responds that the degree between { 0,0} and {1,1} is 45, which seems right. However, when I set the sprite rotation…

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• No Mouse Pointer - ubuntu 13.10

  - by Paul

  just installed 13.10 on my HP Envy M6 laptop and have no mouse pointer. My USB mouse does not work and neither does the track pad. When I booted from a USB key everything worked OK but once installed it seems to have broken the mouse. Unlike other posts, there is no flicker, it simply doesn't work at all. My laptop is an i5 with 6gb and…

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• Question on passing a pointer to a structure in C to a function?

  - by worlds-apart89

  Below, I wrote a primitive singly linked list in C. Function "addEditNode" MUST receive a pointer by value, which, I am guessing, means we can edit the data of the pointer but can not point it to something else. If I allocate memory using malloc in "addEditNode", when the function returns, can I see the contents of first-next ? Second…

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• Mouse pointer strange problem...

  - by Paska

  Hi all, i have last ubuntu installed (10.10), but from an year and thousand updates, video drivers updates, an hundreds of tricks, the mouse pointer is showed like an UGLY square... These are the screenshots: First Second I have no idea what to do to solve this problem. Anyone of you have an idea to solve it? Edit: this problem…

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• White screen with pointer after removing Unity

  - by Sameer Pandit

  I have the same problem . I am a newbie. I added the repository with sudo add apt-get-repository ppa:canonical-dx-team/une then i went to ubuntu software center and installed "unity interface of ubuntu netbook edition" . after installing i found a problem with User interface as it kept on flashing when mouse points to side…

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• Bug: unable to handle kernel NULL pointer dereference at

  - by maria

  I have recently installed new system on my disc, Ubuntu 12.04. Installation proceeded without problems, I started installing additional software and put data from other discs. I had already two times bug report, it was quite long, and I have no idea how to acces to log file (which probably is somewhere saved) and since I had to…

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• How does dereferencing of a function pointer happen?

  - by eSKay

  Why and how does dereferencing a function pointer just "do nothing"? This is what I am talking about: #include<stdio.h> void hello() { printf("hello"); } int main(void) { (*****hello)(); } From a comment over here: function pointers dereference just fine, but the resulting function designator will be…

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• IDataRecord.IsDBNull causes an System.OverflowException (Arithmetic Overflow)

  - by Ciddan

  Hi! I have a OdbcDataReader that gets data from a database and returns a set of records. The code that executes the query looks as follows: OdbcDataReader reader = command.ExecuteReader(); while (reader.Read()) { yield return reader.AsMovexProduct(); } The method returns an IEnumerable of a custom type…

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• Parsing an arithmetic expression and building a tree from it in Java

  - by ChocolateBear

  Hi, I needed some help with creating custom trees given an arithmetic expression. Say, for example, you input this arithmetic expression: (5+2)*7 The result tree should look like: * / \ + 7 / \ 5 2 I have some custom classes to represent the different types of nodes, i.e. PlusOp, LeafInt, etc.…

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• MiniMax function throws null pointer exception

  - by Sven

  I'm working on a school project, I have to build a tic tac toe game with the AI based on the MiniMax algorithm. The two player mode works like it should. I followed the code example on http://ethangunderson.com/blog/minimax-algorithm-in-c/. The only thing is that I get a NullPointer Exception when I run the…

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• Android - Force Close - Null Pointer on Canvas?

  - by user22241

  Please bear with me. I have a very odd problem. Basically, my app so far, has 3 activities (a main splash screen, an 'options/menu' screen and the main app). If I follow the very specific steps oulined below, I get a 'null pointer exception' in the 2nd activity) and the app force closes...... Here are…

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• Is there something special about the number 65535?

  - by Nick Rosencrantz

  2¹6-1 & 25 = 25 (or? obviously ?) A developer asked me today what is bitwise 65535 & 32 i.e. 2¹6-1 & 25 = ? I thought at first spontaneously 32 but it seemed to easy whereupon I thought for several minutes and then answered 32. 32 seems to have been the correct answer but how?…

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• X11: How do I REALLY grab the mouse pointer?

  - by Drew Hall

  I've implemented a horizontal splitter widget in Xlib. I'm trying to grab the mouse when the user clicks & drags on the splitter bar (so that the user can dynamically move the split & thus resize the windows on either side of the splitter bar). I've used XGrabPointer() after…

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• How to get a float value the pointer points to?

  - by aleluja

  Hello, In my app, i've created the TList type list where i store the pointers to 1 string and 2 float(real) values for every 3 items. aList.Add(@sName); //string aList.Add(@x1); //float aList.Add(@x2); //float Then, i want to get the values out from the list, but i could only do…

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• "ID 046d:c50e Logitech, Inc. Cordless Mouse Receiver" wheel-click is wrong

  - by sputnick

  I use this mouse under archlinux x86_64 with 3.2.8-1-ARCH kernel. I have some problems to select and then paste with the wheel-click in some applications like konversation, not in a terminal nor an editor. I don't know if it's a hardware problem or a software one. $ lsusb -v Bus…

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• VHDL, using arithmetic & variables in "downto"?

  - by waitinforatrain

  Hey, Quick VHDL question, I don't have access to Xilinx at the moment due to dead laptop, so can't test this. I was wondering if it's possible to use variables and arithmetic in 'downto' statements, e.g: proc: process (x) begin y <= z(x downto 0) & z(7 downto x); end…

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• SQL Server cast fails with arithmetic overflow

  - by Jamie Ide

  According to the entry for decimal and numeric data types in SQL Server 2008 Books Online, precision is: p (precision) The maximum total number of decimal digits that can be stored, both to the left and to the right of the decimal point. The precision must be a value from…

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• C++ warning: suggest parentheses around arithmetic in operand of |

  - by user358172

  Hi I have a code like A = B|C|D|E; Throwing the warning "suggest parentheses around arithmetic in operand of |" Expecting that expression needs high priority paranthesis for operators, tried the following ways: A=(B|C)|(D|E); one more as : A=(((B|C)|D)|E); Still the same…

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• Arbitrary-precision arithmetic Explanation

  - by TT

  I'm trying to learn C and have come across the inability to work with REALLY big numbers (i.e., 100 digits, 1000 digits, etc.). I am aware that there exist libraries to do this, but I want to attempt to implement it myself. I just want to know if anyone has or can provide a…

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• Versant OQL Statement with an Arithmetic operator

  - by Pascal

  I'm working on a c# project that use a Versant Object Database back end and I'm trying to build a query that contains an arithmetic operator. The documentation states that it is supported but lack any example. I'm trying to build something like this: SELECT * FROM…

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• doing arithmetic upto two significant figures in Python?

  - by user248237

  I have two floats in Python that I'd like to subtract, i.e. v1 = float(value1) v2 = float(value2) diff = v1 - v2 I want "diff" to be computed upto two significant figures, that is compute it using %.2f of v1 and %.2f of v2. How can I do this? I know how to print…

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• Why does perl crash with "*** glibc detected *** perl: munmap_chunk(): invalid pointer"?

  - by sid_com

  #!/usr/bin/env perl use warnings; use strict; use 5.012; use XML::LibXML::Reader; my $reader = XML::LibXML::Reader->new( location => 'http://www.heise.de/' ) or die $!; while ( $reader->read ) { say $reader->name; } At the end of the output from…

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• What does the Asterisk * mean in Objective-C?

  - by Thanks

  Is it true, that the Asterisk always means "Hey, that is a pointer!" And an Pointer always holds an memory adress? (Yes I know for the exception that a * is used for math operation) For Example: NSString* myString; or SomeClass* thatClass; or …

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