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  • Taming XCode’s auto-complete options

    - by Nippysaurus
    I am fairly new to XCode and the Objective-C language. When I am instantiating a class, for example an NSMutableArray, XCode will provide a whole lot of auto-complete options. Even for an empty class which simply extends an NSObject has many options, most of which seem completely useless. What is the reason for having so many auto-complete options, or can they be "tamed" in the preferences?

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  • 2d trajectory planning of a spaceship with physics.

    - by egarcia
    I'm implementing a 2D game with ships in space. In order to do it, I'm using LÖVE, which wraps Box2D with Lua. But I believe that my question can be answered by anyone with a greater understanding of physics than myself - so pseudo code is accepted as a response. My problem is that I don't know how to move my spaceships properly on a 2D physics-enabled world. More concretely: A ship of mass m is located at an initial position {x, y}. It has an initial velocity vector of {vx, vy} (can be {0,0}). The objective is a point in {xo,yo}. The ship has to reach the objective having a velocity of {vxo, vyo} (or near it), following the shortest trajectory. There's a function called update(dt) that is called frequently (i.e. 30 times per second). On this function, the ship can modify its position and trajectory, by applying "impulses" to itself. The magnitude of the impulses is binary: you can either apply it in a given direction, or not to apply it at all). In code, it looks like this: def Ship:update(dt) m = self:getMass() x,y = self:getPosition() vx,vy = self.getLinearVelocity() xo,yo = self:getTargetPosition() vxo,vyo = self:getTargetVelocity() thrust = self:getThrust() if(???) angle = ??? self:applyImpulse(math.sin(angle)*thrust, math.cos(angle)*thrust)) end end The first ??? is there to indicate that in some occasions (I guess) it would be better to "not to impulse" and leave the ship "drift". The second ??? part consists on how to calculate the impulse angle on a given dt. We are in space, so we can ignore things like air friction. Although it would be very nice, I'm not looking for someone to code this for me; I put the code there so my problem is clearly understood. What I need is an strategy - a way of attacking this. I know some basic physics, but I'm no expert. For example, does this problem have a name? That sort of thing. Thanks a lot.

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  • Xcode debugger stops with "EXC_BAD_ACCESS" - bug in my code or in Xcode?

    - by Substance G
    Hi, I got this error just one time (non-repeatable) while running my Objective-C & C++ program with the Xcode debugger: Program received signal: “EXC_BAD_ACCESS”. Xcode could not locate source file: sweep.c (line: 1026) kill quit I don't have any references to any "sweep.c" in my code, so I'm thinking maybe it's a Xcode/GDB error. Anything I can do to further investigate this? Am using standard Xcode 3.2.2 (uses GNU gdb 6.3.50-20050815 (Apple version gdb-1460)) on OS X 10.6.3

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  • Is there a simple way for opening one (or many) opengl window in mac OS X with C++ ?

    - by Petruza
    Yes, I hate Objective-c, plus my project will be portable, so I'd like to code as much of it in C++ as possible, ideally 100%. So I have a regular C++ project made with Xcode, and want to open some OpenGL windows. edit: Damn, Glut takes over the app's control with glutMainLoop(), pretty much as SDL does, I'm trying to break free from that schemes. Will try freeglut, although I can't find OSX binaries, and I always have such bad luck trying to compile someone else's code.

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  • Visual Studio PC benchmark

    - by user319353
    Hi: Is there a good way to benchmark a Visual Studio developer PC, instead of looking at the technical specs? Objective is to set a level and see every developer passes, if not upgrade them to new PC. Any thoughts and suggestions?

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  • iPhone SDK: path and Inner Shadow

    - by JustMe
    Take a look of this image: http://imagebin.ca/img/b-W91wDU.png I have some CGPath like the image 1 and I would like to know how I can create an inner shadow effect like the image 2 I'm working with objective-c and Core Graphics iPhone SDK: 3.2

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  • Private api's list

    - by Mohammed Sadiq
    Hi, Is there any link available that gives the list of private api's used in iPhone. My objective is to access the SMS, calendar, audi, video's from non jailbroken iPhone. I searched in the following link , but could not find any related informations. link text Best Regards, Mohamed Sadiq

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  • Execute a Rake task from within migration?

    - by Fabiano PS
    I have a Rake task that loads configuration data into the DB from a file, is there a correct ruby/rails way to call it on a migration up? My objective is to sync my team DB configs, without have to broadcast then to run the migration lalala def self.up change_table :fis_situacao_fiscal do |t| t.remove :mostrar_endereco t.rename :serie, :modelo end Faturamento::Cfop.destroy_all() #perform rake here ! end btw: Admins could clean up some tags? there is 'migrations' and 'migration', same as 'ruby-on-rails' and 'rails'

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  • Are wrapper classes banned in the iPhone OS Developer Agreement?

    - by barfoon
    Hey everyone, I am a little confused after reading this thread on the revisions to the iPhone Developer Agreement. While it lists the languages that are permitted, I don't understand what classifies as falling under what is banned. Does this include wrapper classes? What if the code is written in Objective C but is not an official Apple class/library? I'm wondering about things like: Three20 from Facebook SQLite Wrappers such as this one Charting / Graphing Libraries If anyone could clarify this, I'd greatly appreciate it.

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  • C-based (SAX style) XML generator recommendations?

    - by Eonil
    I'm making an XML generator library for Objective-C in iPhone. It's pretty big work making fully standard based generator. So I'm finding a well-documented, stable, proven C lib for generating XML document string by commands (or events) like SAX parser. Any recommendations?

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  • parsing HTML on the iPhone

    - by Ben Alpert
    Can anyone recommend a C or Objective-C library for HTML parsing? It needs to handle messy HTML code that won't quite validate. Does such a library exist, or am I better off just trying to use regular expressions?

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  • Determine the length of an audio recording?

    - by MikeN
    How do I determine the length of an audio recording I am recording programaticaly? My current solution is to just time the start/stop recording events on the User Interface (literally the time the user hits record, then hits stop recording.) Given a .aac audio file, is there some library call in Objective-C or Python to determine its length?

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  • Howto start writing iPad applications?

    - by Lothar
    I know Objective-C from Desktop Apple Programming. But i want to jump on the iPad bandwagon and start developing some small edutainment applets. Is the iPad API the same as iPhone just with more power? Do i need to join the iPhone developer program and does it still start with $100. Is there any iPad emulator yet?

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  • iPhone integration with Google Buzz

    - by radesix
    Many iPhone apps have the capability to integrate with Twitter, Facebook, and other social networking apps. It is possible yet to integrate with Google Buzz? I've checked the Google API docs for Objective C here http://code.google.com/p/gdata-objectivec-client/ But I don't see any mention of Google Buzz.

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  • Clean url in IIS 5.0

    - by Testadmin
    Hai Thanks for everything. I have successfully implemented clean URL in local. Very nice site. Now my objective is to create a clean URL web site in PHP Microsoft IIS 5.0, I know this in Apache. But I don't know how this on IIS. Does any one give me a solution?

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  • CGRect in C code

    - by Leif Andersen
    A simple google search for: CGRect + C or CGRect in C brings back only Apple, iPhone, and Objective-C websites. However, I remember hearing that Core Graphics was part of C at my university. Did I hear incorrectly, or is CGRect something that I can use in C, or even C++ as it's Object oriented?

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  • How can I provide an ASP.NET Forms Authentication UX while using Active Directory Role and Authentic

    - by Nate Bross
    Is it possible to use this Role Provider AspNetWindowsTokenRoleProvider with ASP.NET FORMS Authentication (via this MembershipProvider System.Web.Security.ActiveDirectoryMembershipProvider)? It seems to only work with <authentication mode="Windows">, is it possible to use it with FORMS? background -- The objective here is to provide an ASP.NET Forms UX while using Active Directory as the back-end authentication system. If there is another, easy way to do this using built-in technologies, that's great and I'd like to hear about that as well.

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  • How to generate Function caller graphs for other languages?

    - by Jeremy Rudd
    I like the way Doxygen combines with Graphviz dot to generate function caller graphs. I'd like this functionality for other languages as well, apart from the basics that Doxygen supports (C++, C, Java, Objective-C, Python, VHDL, PHP, C#). I'm currently interested in JavaScript, ActionScript 2 and ActionScript 3/Flex but am looking for ways or tools that have a wider language support than Doxygen. Is there any way to get function caller graphs for any other languages?

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  • How to promote my Rss feed ?

    - by Ican Zilb
    I started recently this blog about iPhone / Objective-c : www.touch-code-magazine.com and I'm looking for ways to spread the word about my Rss feed. Question is how one promotes an rss feed ? Any of you have good recommendation how to do that? Advice on "best" feed directories or thematic portals which consume rss ... don't know, what do you say ?

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  • Recommended Clang command line options

    - by frou
    The Manual for Clang seems to be work in progress, so could you help me formulate the definitive command line options for compiling ANSI-C (AKA C89, C90) with maximum strictness and relevant/helpful warnings? Clang is a compiler front end for the C, C++, and Objective-C programming languages. It uses the Low Level Virtual Machine (LLVM) as its back end. It is still under development. Its goal is to offer a replacement to the GNU Compiler Collection (GCC)

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  • physics game programming box2d - orientating a turret-like object using torques

    - by egarcia
    This is a problem I hit when trying to implement a game using the LÖVE engine, which covers box2d with Lua scripting. The objective is simple: A turret-like object (seen from the top, on a 2D environment) needs to orientate itself so it points to a target. The turret is on the x,y coordinates, and the target is on tx, ty. We can consider that x,y are fixed, but tx, ty tend to vary from one instant to the other (i.e. they would be the mouse cursor). The turret has a rotor that can apply a rotational force (torque) on any given moment, clockwise or counter-clockwise. The magnitude of that force has an upper limit called maxTorque. The turret also has certain rotational inertia, which acts for angular movement the same way mass acts for linear movement. There's no friction of any kind, so the turret will keep spinning if it has an angular velocity. The turret has a small AI function that re-evaluates its orientation to verify that it points to the right direction, and activates the rotator. This happens every dt (~60 times per second). It looks like this right now: function Turret:update(dt) local x,y = self:getPositon() local tx,ty = self:getTarget() local maxTorque = self:getMaxTorque() -- max force of the turret rotor local inertia = self:getInertia() -- the rotational inertia local w = self:getAngularVelocity() -- current angular velocity of the turret local angle = self:getAngle() -- the angle the turret is facing currently -- the angle of the like that links the turret center with the target local targetAngle = math.atan2(oy-y,ox-x) local differenceAngle = _normalizeAngle(targetAngle - angle) if(differenceAngle <= math.pi) then -- counter-clockwise is the shortest path self:applyTorque(maxTorque) else -- clockwise is the shortest path self:applyTorque(-maxTorque) end end ... it fails. Let me explain with two illustrative situations: The turret "oscillates" around the targetAngle. If the target is "right behind the turret, just a little clock-wise", the turret will start applying clockwise torques, and keep applying them until the instant in which it surpasses the target angle. At that moment it will start applying torques on the opposite direction. But it will have gained a significant angular velocity, so it will keep going clockwise for some time... until the target will be "just behind, but a bit counter-clockwise". And it will start again. So the turret will oscillate or even go in round circles. I think that my turret should start applying torques in the "opposite direction of the shortest path" before it reaches the target angle (like a car braking before stopping). Intuitively, I think the turret should "start applying torques on the opposite direction of the shortest path when it is about half-way to the target objective". My intuition tells me that it has something to do with the angular velocity. And then there's the fact that the target is mobile - I don't know if I should take that into account somehow or just ignore it. How do I calculate when the turret must "start braking"?

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  • dynamic memory allocation in C

    - by avanish
    int main() { int p; scanf("%d",&p); fun() { int arr[p]; //isn't this similar to dynamic memory allocation?? } } //if not then what other objective is achieved using malloc and calloc?? //Someone please throw some light :-)

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