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• Adding multiplayer to an HTML5 game

  - by espais

  I am interested in making a game that I currently have a co-op experience, however I'm curious as to the best method of implementing this in HTML5. I have made games before using straight C sockets, and also with the Net library for SDL. What are some of my best options for doing this in a canvas-based environment? At present, all I can come up with are either AJAX/database solutions (with a high refresh rate), or somehow implementing a PHP server that would funnel the data through sockets. The overall gameplay would be a 2.5D platformer-ish type of game, so both clients would need to be continually updated with player positions, enemy positions, projectiles, environmental data, etc.

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• What problem does double or triple buffering solve in modern games?

  - by krokvskrok

  I want to check if my understanding of the causes for using double (or triple) buffering is correct: A monitor with 60Hz refresh's the monitor-display 60 times per second. If the monitor refresh the monitor-display, he updates pixel for pixel and line for line. The monitor requests the color values for the pixels from the video memory. If I run now a game, then this game is constantly manipulating this video memory. If this game don't use a buffer strategy (double buffering etc.) then the following problem can happen: The monitor is now refreshing his monitor-display. At this moment the monitor had refreshed the first half monitor-display already. At the same time, the game had manipulated the video memory with new data. Now the monitor accesses for the second half monitor-display this new manipulated data from the video memory. The problems can be tearing or flickering. Is my understanding of cases of using buffer strategy correct? Are there other reasons?

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• Why wont SVN work on the Google Code Source? [closed]

  - by BluFire

  I installed SVN Toroise. I then proceeded to the desktop and right clicked and clicked on SVN checkout. I then entered under the URL of Repository "http://apple-crunch.googlecode.com/svn/trunk/ apple-crunch-read-only" but after a few seconds the checkout fails saying that the URL doesn't exist. I got the command line from http://code.google.com/p/apple-crunch/source/checkout I'm trying to get a direct copy instead of browsing through the source.

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• Presenting game center leaderboard

  - by Coder404

  I have the following code: -(void)showLeaderboard { GKLeaderboardViewController *leaderboardController = [[GKLeaderboardViewController alloc] init]; if (leaderboardController != NULL) { leaderboardController.timeScope = GKLeaderboardTimeScopeAllTime; leaderboardController.leaderboardDelegate = self; [self presentModalViewController: leaderboardController animated: YES]; } [leaderboardController release]; } Which I am trying to use to make my leader-board pop up. The issue is cocos2d will not allow me to use the line: [self presentModalViewController: leaderboardController animated: YES]; How do I fix this? Thanks PS I am using cocos2d

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• SDL - Getting a single keypress event instead of a keystate?

  - by MrKatSwordfish

  Right now I'm working on a simple SDL project, but I've hit an issue when trying to get a single keypress event to skip past a splash screen. Right now, there are 4 start-up splash screens that I would like to be able to skip with a single keypress (of any key). My issue is that, as of now, if I hold down a key, it skips through each splash screen to the very last one immediately. The splash screens are stored as an array of SDL surfaces which are all loaded at the initialization of the state. I have an variable called currentSplashImage that controls which element of the array is being rendered on the screen. I've set it up so that whenever there's a SDL_KEYDOWN event, it triggers a single incrementation of the currentSplashImage variable. So, I'm really not sure why my code isn't working correctly. For some reason, when I hold down a button, it seems to be treating the held button as a new key press event every time it ticks through the code. Does anyone know how I can go about fixing this issue? [Here's a snippet of code that I've been using...] void SplashScreenState::handleEvents() { SDL_PollEvent( &localEvent ); if ( localEvent.type == SDL_KEYDOWN ) { if ( currentSplashImage < 3 && currentSplashImage >= 0) { currentSplashImage++; } } else if ( localEvent.type == SDL_QUIT ) { smgaEngine.setRunning(false); } } I should also mention that the SDL_Event 'localEvent' is part of the GameState parent class, while this event handling code is part of a SplashScreenState subclass. If anyone knows why this is happening, or if there is any way to improve my code, It'd be helpful to me! :D I'm still a very new programmer, trying to learn. UPDATE: I added a std::cout line to that the code runs multiple times with a single KEYDOWN event. I also tried disabling SDL_EnableKeyRepeat, but it didn't fix the issue. void SplashScreenState::handleEvents() { SDL_PollEvent( &localEvent ); if ( localEvent.type == SDL_KEYDOWN ) { if ( currentSplashImage < 3 && currentSplashImage >= 0) { currentSplashImage++; std::cout << "KEYDOWN.."; //<---- test cout line } } else if ( localEvent.type == SDL_QUIT ) { smgaEngine.setRunning(false); } } This prints out "KEYDOWN..KEYDOWN..KEYDOWN.." in the cout stream when a button is held.

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• Playing a death anim on an enemy that I want to remove

  - by Max

  I've been trying to find a tutorial on how to best make animations in Android. I already have some animations for my enemies and my character that are controlled by rectangles and changing rectangleframe between updates using a picture like this: When I'm shooting my enemies they lose HP, and when their HP == 0 they get removed. As long as I'm using an arrayList (which I do for all enemies and bullets) I'm fine, since I can just use list.remove(i). But when I'm on a boss-level and the Boss's HP == 0, I want to remove him and play an animation of an explosion of stars before the "End-screen". Is there a preferred way to do temporary animations like this? If you can give me an example or redirect me to a tutorial, I'd be really grateful!

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• box2d and constant movement

  - by Arnas

  i'm developing a game with a top down view, the players body is a circle. To move the character you need to tap on the screen and it moves to the spot. To achieve this i'm saving the coordinate of the touch and call a method every frame which applies linear velocity to the body with a vector of the direction the body should go _body->SetLinearVelocity(b2Vec2((a.x - currPos.x)/SPEED_RATIO,(size.height - a.y - currPos.y)/SPEED_RATIO)); //click position - current position, screen height - click position (since the y axis is flipped, (0,0) is in the bottom left ) - current position = vector of the direction we want to go now the problem with this is that the body slows down until it finally stops when getting closer to the point we want it to go, since the closer we are to that point the lenght of the vector gets smaller. Besides that i've read that it's bad practice to set linear velocity in box2d and i should use apply force instead, but that way the forces would add up and overshoot the target where it's supposed to stop. So what i'm asking is how to move a box2d body to a coordinate in constant speed.

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• Designing Snake AI

  - by Ronald

  I'm new to this gamedev stackechange but have used the math and cs sites before. So, I'm in a competition to create AI for a snake that will compete with 3 other snakes in 5 minute rounds where the rules are much like the traditional Nokia snake game except that there are 4 snakes, the board is 50x50 and there are a number of small obstacles on the field. Like the Nokia game, your snake grows when you get to the fruit and if you crash into yourself, another snake or the wall you die. The game runs with a 50ms delay between moves and the server sends the new game state every 50ms which the code must analyze and what not and output the next move. The winner is the snake who had the longest length at any point in the game. Tie breakers are decided by kills. So far what I have done is implemented an A* graph search from each snake to determine if my snake is the closest to the apple and if it is, it goes for the apple. Otherwise, I made a neat little algorithm to determine the emptiest area of the board, which my snake goes for, to anticipate the next apple. Other than this I have some small survivability checks to ensure my snake isn't walking into a trap that it can't get out and if it does get stuck, I have something to give it a better chance of getting out. ... Anyway, I've tested my snake on a test server and it does quite well. Generally, my strategy of only going for the apple when its a sure thing and finding space when its not makes it grow faster than any other snakes (some snakes do a similar thing but often just go to the middle or a corner) sometimes it wins these trial games but is more often than not beaten by the same snake who seems to have the edge on survivability(my snake grows quicker but then dies somehow and this other snake just plods slowly along and wins on consistency. So I was wondering about any ideas anyone has to try and improve my snake. Or maybe ideas at a new approach to take. My functions and classes are good so changes that might seem drastic shouldn't be too bad. I encourage all ideas. Any thoughts ??

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• Android - Multiplayer Game - Client / Server - Java etc

  - by user1405328

  I must write a multiplayer pong game for the school. Where are thousand of rooms and where two players can go in to a room and play together and collect points. I programmed the Pong game using Java (LibGDX). How can I do the Network part. I searched the web. And I came across Kryonet. Is there something better? What should I google. On the Internet there are a lot of those questions. And no good answers. I hope that this most questions can be answered. If someone has actual Open Source network game links, tutorials, books, network tutorial, etc. All this would help everyone. Thank you.

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• Projectile Rotation

  - by Alex

  I'm trying to add a projectile system like the projectiles in Realm Of The Mad God. (YouTube it to see what I mean) These projectiles seem to move according to their rotation perfectly and can have nearly any rotation. They also have near perfect hitboxing. What's the maths behind this? My Game works on an integer-based coordinate system, but at the moment projectiles can only shoot either 0, 45, 90, 135, 180, 225, 270 and 315 degrees.

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• Drawing two orthogonal strings in 3d space in Android Canvas?

  - by hasanghaforian

  I want to draw two strings in canvas.First string must be rotated around Y axis,for example 45 degrees.Second string must be start at the end of first string and also it must be orthogonal to first string. This is my code: String text = "In the"; float textWidth = redPaint.measureText(text); Matrix m0 = new Matrix(); Matrix m1 = new Matrix(); Matrix m2 = new Matrix(); mCamera = new Camera(); canvas.setMatrix(null); canvas.save(); mCamera.rotateY(45); mCamera.getMatrix(m0); m0.preTranslate(-100, -100); m0.postTranslate(100, 100); canvas.setMatrix(m0); canvas.drawText(text, 100, 100, redPaint); mCamera = new Camera(); mCamera.rotateY(90); mCamera.getMatrix(m1); m1.preTranslate(-textWidth - 100, -100); m1.postTranslate(textWidth + 100, 100); m2.setConcat(m1, m0); canvas.setMatrix(m2); canvas.drawText(text, 100 + textWidth, 100, greenPaint); But in result,only first string(text with red font)is visible. How can I do drawing two orthogonal strings in 3d space?

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• What are the key "connectors" for animation creation?

  - by qaisjp

  I'm creating an animation "engine" for a 2D game which loads a *.2dped file to load a character (it's body part positions, height, length of arm etc), and then a *.2difp to manipulate the body part positions. I'd like to know what the key body parts (bones, I mean) I should allow to be manipulated. My current list, sorted by ID's: 1: BONE_PELVIS1 2: BONE_PELVIS 3: BONE_SPINE1 4: BONE_UPPERTORSO 5: BONE_NECK 6: BONE_HEAD2 7: BONE_HEAD1 8: BONE_HEAD 21: BONE_RIGHTUPPERTORSO 22: BONE_RIGHTSHOULDER 23: BONE_RIGHTELBOW 24: BONE_RIGHTWRIST 25: BONE_RIGHTHAND 26: BONE_RIGHTTHUMB 31: BONE_LEFTUPPERTORSO 32: BONE_LEFTSHOULDER 33: BONE_LEFTELBOW 34: BONE_LEFTWRIST 35: BONE_LEFTHAND 36: BONE_LEFTTHUMB 41: BONE_LEFTHIP 42: BONE_LEFTKNEE 43: BONE_LEFTANKLE 44: BONE_LEFTFOOT 51: BONE_RIGHTHIP 52: BONE_RIGHTKNEE 53: BONE_RIGHTANKLE 54: BONE_RIGHTFOOT It's currently made to support real people, but am I going too accurate for a 2D character?

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• Acceleration Based Player Movement

  - by Mike Sawayda

  Ok, so I am making a first person shooter game and I am currently working on movement that looks and feels good. I want to incorporate acceleration based movement for the player so that he has to accelerate to max speed and decelerate to minimum speed. Acceleration will happen when you have the key pressed and deceleration will happen when you let go of that key. The problem is that there are some instances where you switch from moving forward to moving backward where no deceleration is needed because you could potentially be moving at double speed in the reverse if you did. Does anyone have a good implementation of how to accomplish acceleration based movement that works well?

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• State Changes in a Component Based Architecture [closed]

  - by Maxem

  I'm currently working on a game and using the naive component based architecture thingie (Entities are a bag of components, entity.Update() calls Update on each updateable component), while the addition of new features is really simple, it makes a few things really difficult: a) multithreading / currency b) networking c) unit testing. Multithreading / Concurrency is difficult because I basically have to do poor mans concurrency (running the entity updates in separate threads while locking only stuff that crashes (like lists) and ignoring the staleness of read state (some states are already updated, others aren't)) Networking: There are no explicit state changes that I could efficiently push over the net. Unit testing: All updates may or may not conflict, so automated testing is at least awkward. I was thinking about these issues a bit and would like your input on these changes / idea: Switch from the naive cba to a cba with sub systems that work on lists of components Make all state changes explicit Combine 1 and 2 :p Example world update: statePostProcessing.Wait() // ensure that post processing has finished Apply(postProcessedState) state = new StateBag() Concurrently( () => LifeCycleSubSystem.Update(state), // populates the state bag () => MovementSubSystem.Update(state), // populates the state bag .... }) statePostProcessing = Future(() => PostProcess(state)) statePostProcessing.Start() // Tick is finished, the post processing happens in the background So basically the changes are (consistently) based on the data for the last tick; the post processing can a) generate network packages and b) fix conflicts / remove useless changes (example: entity has been destroyed - ignore movement etc.). EDIT: To clarify the granularity of the state changes: If I save these post processed state bags and apply them to an empty world, I see exactly what has happened in the game these state bags originated from - "Free" replay capability. EDIT2: I guess I should have used the term Event instead of State Change and point out that I kind of want to use the Event Sourcing pattern

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• Getting Center and Radius of Irregural Object

  - by Moaz ELdeen

  I have drawn an asteroid object manually , and would like to get its center/radius by a specific equation. I think I can get them by calculated and hard-coded values. The code to draw the asteroid: void Asteroid::Draw() { float ratio = app::getWindowWidth()/app::getWindowHeight(); gl::pushMatrices(); gl::translate(m_Pos*ratio); gl::scale(3.5*ratio,3.5*ratio,3.5*ratio); gl::color(ci::Color(1,1,1)); gl::drawLine(Vec2f(-15,0),Vec2f(-10,-5)); gl::drawLine(Vec2f(-10,-5),Vec2f(-5,-5)); gl::drawLine(Vec2f(-5,-5),Vec2f(-5,-8)); gl::drawLine(Vec2f(-5,-8),Vec2f(5,-8)); gl::drawLine(Vec2f(5,-8),Vec2f(5,-5)); gl::drawLine(Vec2f(5,-5),Vec2f(10,-5)); gl::drawLine(Vec2f(10,-5),Vec2f(15,0)); gl::drawLine(Vec2f(15,0),Vec2f(10,5)); gl::drawLine(Vec2f(10,5),Vec2f(-10,5)); gl::drawLine(Vec2f(-10,5),Vec2f(-10,5)); gl::drawLine(Vec2f(-15,0),Vec2f(-10,5)); gl::popMatrices(); } According to the answer I have written that code to calculate the radius, is it correct or not ? cinder::Vec2f Asteroid::getCenter() { return ci::Vec2f(m_Pos.x, m_Pos.y); } double Asteroid::getRadius() { ci::Vec2f _vec = (getCenter()- Vec2f(15,5)); return _vec.length()*0.3f; }

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• Rotate an image and get back to its original position - opengles glkit

  - by Manoj

  I need to rotate an image in opengles GLkit and get it back to its original position in GLkit. rotation += 5; _modelViewMatrix = GLKMatrix4Rotate( _modelViewMatrix, GLKMathDegreesToRadians(5), 1, 0, 0); _modelViewMatrix = GLKMatrix4Rotate( _modelViewMatrix, GLKMathDegreesToRadians(rotation), 1,0,0); I need to move it in x axis for certain amount and getting back to its original position from where it started. How should i do it?

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• Help comparing Cocos2d and Unity3d for this project [closed]

  - by Omega

  I will not go into details, but I would like to hear your opinions about this: Essentially, my project will be a 2d game, with lots of complex levels, where some might be simple and others might be a bit more deep, with physics, etc. We want to implement our very own online structure: logging in, leaderboards, achievements, friends etc with our own servers. This means no OpenFeint nor GameCenter at all. We expect this game to be very large in both graphics and audio. We wish to use in-app purchases. Now, we considered two options. Cocos2d and Unity3d. We need help deciding using the factors I mentioned before (networking, good performance even for a large game in terms of graphics and audio like this, in-app purchases, etc) which option would fit better this? Technically, both options can create 2d games. I'd like to hear your opinion.

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• Getting Started with Component Architecture: DI?

  - by ashes999

  I just moved away from MVC towards something more component-architecture-like. I have no concept of messages yet (it's rough prototype code), objects just get internal properties and values of other classes for now. That issue aside, it seems like this is turning into an aspect-oriented-programming challenge. I've noticed that all entities with, for example, a position component will have similar properties (get/set X/Y/Z, rotation, velocity). Is it a common practice, and/or good idea, to push these behind an interface and use dependency injection to inject a generic class (eg. PositionComponent) which already has all the boiler-plate code? (I'm sure the answer will affect the model I use for message/passing)

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• Need ideas on how to give my levels structure

  - by akuritsu

  I am making an iOS game for a project at school. It is going to be a tiny bit like Fruit Ninja, as in it will have different things on the screen, and when you hit them, they die, and you get points. The trouble is that unlike Fruit Ninja, my game will have different types of sprites, all doing different things (moving different places, doing different things, etc). The one thing that is bad about having all of these sprites that do different things is that it is hard for them to look neat on the screen all together. I was planning on having a couple of different gamemodes: Time Trial You have 120 seconds to kill as many sprites as possible. Survival You have three lives, every time you try to hit a sprite and miss, you lose a life. ???? Whatever I think of. I am a rookie to game design in general, and I don't know the best way to make my game look good, and play well. I could have all of these sprites on the screen at the same time, or I could have them come in waves, for example 10 of sprite_a come on, and once they are killed, 10 of sprite_b come on, etc... Please give me your opinion about which one I should code. If you have any other suggestions for either a third gamemode, or a completely different way to make the levels, feel free to tell me.

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• Why are my sprite sheet's frames not visible in Cocos Builder?

  - by Ramy Al Zuhouri

  I have created a sprite sheet with zwoptex. Then I just dragged the .plist and .png files to my Cocos Builder project. After this I wanted to take a sprite frame and set it to a sprite: But the sprite image is empty! At first I thought it was just empty in Cocos Builder, and that it must have been working correctly when imported to a project. But if I try to run that scene with CCBReader I still see an empty sprite. Why?

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• How to create a Raining Effect(Particles) on Android?

  - by user19495

  I am developing a 2d android strategy game, it runs on SurfaceView, so I can't(or can I?) use LibGdx's particle system. And I would like to make a raining effect, I am aiming for something like this( http://ridingwiththeriver.files.wordpress.com/2010/09/rain-fall-animation.gif ), I don't need the splash effect in the end (although that would be superb, but probably would take up a lot of system resources). How could I achieve that raining effect? Any ideas? Thank You a lot in advance!

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• Basic modelling of radar

  - by Hawk66

  I'm currently researching how to model/simulate radar for my naval simulation. Since the emphasis is on modelling ASW or submarines in general, I need only a basic radar model - at least for the beginning. So, does anybody know a resource for such a simple model? The model should take signal strength of the sensor, the size of the target and the terrain (height/ground clutter) into account. Thanks.

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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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• How to swap row/column major order?

  - by 0X1A

  I'm trying to get a sprite sheet clipped in the right order but I'm a bit stumped, every iteration I've tried has tended to be in the wrong order. This is my current implementation. Frames = (TempSurface->h / ClipHeight) * (TempSurface->w / ClipWidth); SDL_Rect Clips[Frames]; for (i = 0; i < Frames; i++) { if (i != 0 && i % (TempSurface->h / ClipHeight) == 0) ColumnIndex++; Clips[i].x = ColumnIndex * ClipWidth; Clips[i].y = i % (TempSurface->h / ClipHeight) * ClipHeight; Clips[i].w = ClipWidth; Clips[i].h = ClipHeight; } Where TempSurface is the entire sheet loaded to a SDL_Surface and Clips[] is an array of SDL_Rects. What results from this is a sprite sheet set to SDL_Rects in the wrong order. For example I need a sheet of dimensions 4x4 to look like this: | 0 | 1 | 2 | 3 | | 4 | 5 | 6 | 7 | | 8 | 9 | 10| 11| | 12| 13| 14| 15| But instead I get this order: | 0 | 4 | 8 | 12| | 1 | 5 | 9 | 13| | 2 | 6 | 10| 14| | 3 | 7 | 11| 15| Columns and rows order does not match. What should I do to fix the order?

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• What is the difference between a View and a View Controller?

  - by Mark F

  from an iphone development perspective

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