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  • Several classes need to access the same data, where should the data be declared?

    - by Juicy
    I have a basic 2D tower defense game in C++. Each map is a separate class which inherits from GameState. The map delegates the logic and drawing code to each object in the game and sets data such as the map path. In pseudo-code the logic section might look something like this: update(): for each creep in creeps: creep.update() for each tower in towers: tower.update() for each missile in missiles: missile.update() The objects (creeps, towers and missiles) are stored in vector-of-pointers. The towers must have access to the vector-of-creeps and the vector-of-missiles to create new missiles and identify targets. The question is: where do I declare the vectors? Should they be members of the Map class, and passed as arguments to the tower.update() function? Or declared globally? Or are there other solutions I'm missing entirely?

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  • Missing launcher, top panel without icons, an ATI driver problem?

    - by jlotero
    After upgrading to Ubuntu 11.10, the following problems occurs when accesing in ubuntu mode (3D): the launcher is missing, top panel without icons on the right side, and I can only restart with Terminal (Alt-T and then sudo reboot). No problems in 2D. It occurs on my PC with AMD Athlon (tm) II X4 640 Processor, Radeon HD5670 and both with the 32-bit and 64 bits versions of Ubuntu. Both versions work well on an older PC with AMD Athlon 64 x2 Dual Core 4200 + processor, and an Nvidia integrated graphics card (C61 GeForce 6150SE nForce 430). Could it be a problem with the ATI driver?

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  • How do you prevent inflation in a virtual economy?

    - by Tetrad
    With your typical MMORPG, players can usually farm the world for raw materials essentially forever. Monsters/mineral veins/etc are usually on some sort of respawn timer, so other than time there really isn't a good way to limit the amount of new currency entering the system. That really only leaves money sinks to try to take money out of the system. What are some strategies to prevent inflation of the in-game currency?

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  • Linux : Microsoft et SUSE renforcent leur partenariat autour de l'interopérabilité pour optimiser les environnements hétérogènes

    Linux : Microsoft et SUSE renforcent leur partenariat Pour l'optimisation des datacenters et l'interopérabilité A l'occasion de la 5ème édition de l'Open World Forum, Microsoft et SUSE ont annoncé le renforcement de leur partenariat avec le lancement d'une plateforme d'évaluation conjointe. « Depuis plus de 10 ans, Microsoft travaille à l'ouverture et l'interopérabilité de ses technologies. A travers cet engagement de long terme, notre objectif est d'offrir de véritables solutions d'optimisation des investissements et des compétences pour les environnements hétérogènes en Cloud privé comme en Cloud public », explique Frédéric Aatz, Directeur de la stratégie interopérabilité de Mic...

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  • Calculating the force of an impact?

    - by meds
    I'm trying to figure out a way to determine the force two objects collide in. I have two vectors defining their linear velocity at the time of impact, their mass and their angular velocity. Keep in mind this is all for a 2D physics engine. I don't think it's as simple as adding up these values and figuring out if it's large enogh it makes a large impact since that doesn't take into account if the two objects are travelling in the same direction (as an example). Any ideas?

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  • State Transition Constraints

    Data Validation in a database is a lot more complex than seeing if a string parameter really is an integer. A commercial world is full of complex rules for sequences of procedures, of fixed or variable lifespans, Warranties, commercial offers and bids. All this requires considerable subtlety to prevent bad data getting in, and if it does, locating and fixing the problem. Joe Celko shows how useful a State transition graph can be, and how essential it can become with the time aspect added.

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  • Why is Java the lingua franca at so many institutions?

    - by Billy ONeal
    EDIT: This question at first seems to be bashing Java, and I guess at this point it is a bit. However, the bigger point I am trying to make is why any one single language is chosen as the one end all be all solution to all problems. Java happens to be the one that's used so that's the one I had to beat on here, but I'm not intentionality ripping Java a new one :) I don't like Java in most academic settings. I'm not saying the language itself is bad -- it has several extremely desirable aspects, most importantly the ability to run without recompilation on most any platform. Nothing wrong with using the language for Your Next App ^TM. (Not something I would personally do, but that's more because I have less experience with it, rather than it's design being poor) I think it is a waste that high level CS courses are taught using Java as a language. Too many of my co-students cannot program worth a damn, because they don't know how to work in a non-garbage-collected world. They don't fundamentally understand the machines they are programming for. When someone can work outside of a garbage collected world, they can work inside of one, but not vice versa. GC is a tool, not a crutch. But the way it is used to teach computer science students is a as a crutch. Computer science should not teach an entire suite of courses tailored to a single language. Students leave with the idea that all good design is idiomatic Java design, and that Object Oriented Design is the ONE TRUE WAY THAT IS THE ONLY WAY THINGS CAN BE DONE. Other languages, at least one of them not being a garbage collected language, should be used in teaching, in order to give the graduate a better understanding of the machines. It is an embarrassment that somebody with a PHD in CS from a respected institution cannot program their way out of a paper bag. What's worse, is that when I talk to those CS professors who actually do understand how things operate, they share feelings like this, that we're doing a disservice to our students by doing everything in Java. (Note that the above would be the same if I replaced it with any other language, generally using a single language is the problem, not Java itself) In total, I feel I can no longer respect any kind of degree at all -- when I can't see those around me able to program their way out of fizzbuzz problems. Why/how did it get to be this way?

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  • Adding a short delay between bullets

    - by Sun
    I'm having some trouble simulating bullets in my 2D shooter. I want similar mechanics to Megaman, where the user can hold down the shoot button and a continues stream of bullets are fired but with a slight delay. Currently, when the user fires a bullet in my game a get an almost laser like effect. Below is a screen shot of some bullets being fired while running and jumping. In my update method I have the following: if(gc.getInput().isKeyDown(Input.KEY_SPACE) ){ bullets.add(new Bullet(player.getPos().getX() + 30,player.getPos().getY() + 17)); } Then I simply iterate through the array list increasing its x value on each update. Moreover, pressing the shoot button (Space bar) creates multiple bullets instead of just creating one even though I am adding only one new bullet to my array list. What would be the best way to solve this problem?

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  • In what kind of variable type is the player position stored on a MMORPG such as WoW?

    - by jokoon
    I even heard J. Carmack quickly talk about it... How a software can track a player's position so accurately, being on a such huge world, without loading between zones, and on a multiplayer scale ? How is the data formatted when it passes through the netcode ? I can understand how vertices are stored into the graphic card's memory, but when it comes to synchronize the multiplayer, I can't imagine what is best.

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  • Great Websites Are the Windows of Your Online Success

    The World Wide Web is continuing to expand unabated at phenomenal rates, even in recent times, when many conventional businesses and individuals are suffering from the worst economic downturn in decades. The reason behind this amazing explosion of activity is quite clear. More and more people are turning to the internet as a means of earning either a second income stream, or indeed, making the internet their main source of income, and creating new websites is the premier choice of "shop window" for most online businesses.

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  • Should I be using a game engine?

    - by Kyle
    I'm an experienced programmer, but I'm completely new to making games. I'm thinking of making an iPhone game that is similar to a 2d tower defense type game. In the web programming world, it would be a big waste of time to make a website without using some sort of web framework (eg ruby on rails). Is that the same for making games? Do people mostly use some sort of framework/game engine for making a game? If so, what are the popular ones for iOS?

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  • Learning SEO For Your Online Business

    One question that pops in my mind relating to SEO is, "Why SEO techniques should be considered for your Online Business?". Maybe one of the possible answers would be, "SEO helps a lot in the promotion of online business like attracting world wide audience." In this article we will take a closer look at how SEO can help in marketing different business online.

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  • Google Optimization - Your Key For Online Success

    The online market is a highly attractive and lucrative one, in case you need to succeed on the internet there are a lot of different avenues however the one that stands way above all other options is Google. Website business owners can make the most of their online ventures with Google Optimization. A form of SEO or search engine optimization that primarily concentrates on the world's most popular search engine, Google optimization can offer a lot of benefits to your business.

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  • XNA: draw a sprite in 3d, is that possible?

    - by Heisenbug
    since now I always used sprited to draw in 2D: spriteBatch.Draw(myTexture, rectangle, color); (I suppose the texture is binded internally to 2 triangles and then scaled.) Now, I'm porting my game in 3D and I have to draw several planes (walls, floor, roof,..). Do I need to manually binding a texture to a geometry (for example using VertexPositionColorTexture with VertexBuffer and IndexBuffer), or is there any simpler way to do that? I'm looking for something like spriteBatch.Draw with the rectangle clip specified in 3d space: spriteBatch.Draw(myTexture, rectangleIn3D, color);

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  • SEO Can Really Help Your Company

    As the corporate world becomes ever more information hungry, SEO has become an integral part of marketing strategy. Most companies know that having a website is good for business but few understand how to make it work properly for them. Engaging a reputable SEO firm to do the work for them is the best way forward because if you cannot be found when potential customers are looking for you, you will not have an effective presence online.

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  • Yellow Pages Script Perfectly Organizes Info of Businesses

    Yellow pages are also called internal yellow pages for online businesses. In the past, people only had yellow colored directory books but with the passage of time and advancements came into internet world, these directories had been started displaying on internet for people's ease and comfort.

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  • What does it mean if a job requires a "Bachelor's degree in Computer Science or related field"?

    - by Bill
    Specifically, what is meant by "related field"? I'm in the process of pursuing an IT Infrastructure B.A.S. from the U of M (Twin Cities), but have been playing around with the idea of just doing the CSCI B.S. I don't want to be a hardcore programmer, but would having the CSCI degree, instead of the ITI degree, open more doors to whatever profession within the IT world I end up setting my sights on?

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  • XNA Spritebatch sorting by texture vs depth

    - by Motig
    I am refining my 2D game engine, and I want to look in to sorting sprite batches by texture (because I'm quite often using the same textures repeatedly). However, I also want to retain a few 'layers' of depth (i.e. ground < buildings < units < GUI etc). My question is, which of the following is the best approach (in terms of performance)? Create multiple SpriteBatches and Begin() and End() them in order; or... Create a single SpriteBatch and call Begin() and End() multiple times, once for each layer (in order)?

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  • How to create a bookmark under "computer" in the Sidebar of the nautilus file manager in 12.04?

    - by Jiskya
    Somehow, I removed the Downloads bookmark in the Sidebar under "Computer". Is there any way I can make a new one? Possibly with the same icon? I still have my Downloads directory. I just don't have the bookmark under "Computer" anymore, and it has the ordinary folder icon. I know it's not the most significant question, but it's a question nonetheless. Also, I'm not sure, but it may be important to note that I'm using unity 2d.

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  • Collision representation in game overworlds

    - by Akroy
    I'm implementing a 2D overworld where one can walk through an area that is not tile based. I was wondering the best way to implement collisions. In the past when I've done similar things, I've used one image (or set of images) to show an elaborately drawn world and then a second binary image that does nothing but differentiate "wall" and "not wall". Then, I'd use the first for all drawing to the screen, but the second for collision detection. Having another image of the same size to represent collisions seems like lots of overhead. Is there a better way to handle this? (I'm currently using C++ with SDL, although I'm more interested in general concepts)

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