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  • Marching squares: Finding multiple contours within one source field?

    - by TravisG
    Principally, this is a follow-up-question to a problem from a few weeks ago, even though this is about the algorithm in general without application to my actual problem. The algorithm basically searches through all lines in the picture, starting from the top left of it, until it finds a pixel that is a border. In pseudo-C++: int start = 0; for(int i=0; i<amount_of_pixels; ++i) { if(pixels[i] == border) { start = i; break; } } When it finds one, it starts the marching squares algorithm and finds the contour to whatever object the pixel belongs to. Let's say I have something like this: Where everything except the color white is a border. And have found the contour points of the first blob: For the general algorithm it's over. It found a contour and has done its job. How can I move on to the other two blobs to find their contours as well?

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  • Making a startscreen for an HTML5 game?

    - by hustlerinc
    How would I make a start screen for a game using HTML5 canvas? I'm not looking for something advanced, just the new game button and highscore link etc. The question might be stupid, but I've never done anything similar, and the tutorials out there don't cover the subject. Is it enough to just make a fillText with an onclick function? Is there a way to find out the size of the text? Help appreciated.

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  • How to give parallax backgrounds more depth

    - by user28015
    I have 3 tiled images of some sort of galaxy/space in the background of a 2D Game: The first one has an alpha of 100%, the second an alpha of 80% and the last one has an alpha of 60%. I scroll the the one in the background slower than the other ones of course. classic parallax. In the foreground I have some particles flying towards the player to simulate some dust / stars flying by. (I know that stars don't fly by, but I think we all have seen this in a lot of games). But I can't quite achieve the depth effect I am looking for. I want it to look "deeper". I did read something about using blending modes for the backgrounds, but that would require to render them as objects right? So the question is: What is a good technique to do a scrolling parallax background in GameMaker?

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  • How to properly multi thread an RPG

    - by Nagrom_17
    I am working on an RPG type game in Java and I would like to know a few things relating to threading, What is the best way to implement a "wait for this then do this" without hanging the whole thread? Like waiting for a player to move to a location then pick up an item? or to wait one second then attack? Currently I am spawning new threads every time I need to wait for something, but that doesn't feel like the best solution. Any help is appreciated. EDIT: Clarification and an example of how I currently do things. User clicks on an item The function walkToAndPickUp(item) is called which is basically this: Make a new thread so we don't freeze the thread handling input while the player moves. Tell player to move to the item While the player is not at the item(The player moves through an update() function called in a different thread, I don't know how else to do it without freezing threads) Repeat until the player is at the item If the player is at the item then call delete item from map and add to inventory.

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  • Loading assets in Monogame

    - by Matebu
    I'm creating a MonoGame application on Visual Studio 2012, yet when trying to load a texture I get the following problem: Could not load Menu/btnPlay asset! I have set content directory: Content.RootDirectory = "Assets"; Also the file btnPlay.png has properties set: Build Action: Content and Copy to Output directory: Copy if newer. My constructor and LoadContent functions are totally empty, but have a look yourself: public WizardGame() { Window.Title = "Just another Wizard game"; _graphics = new GraphicsDeviceManager(this); Content.RootDirectory = "Assets"; } protected override void LoadContent() { // Create a new SpriteBatch, which can be used to draw textures. _spriteBatch = new SpriteBatch(GraphicsDevice); Texture2D texture = Content.Load<Texture2D>("Menu/btnPlay"); _graphics.IsFullScreen = true; _graphics.ApplyChanges(); } How do I properly load a texture?

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  • LibGDX - SpriteBatch's .draw() method requiring float[]

    - by just_a_programmer
    Please excuse my lack of knowledge with LibGDX, as I have just started learning it. I am going through some simple tutorials, and in one of them, I draw a string onto the screen like so: // the following code is in the main file in the core project folder: // this is in the create() method: private SpriteBatch batch; batch = new SpriteBatch(); // this is in the render() method: batch.draw(batch, "Hello world", 200, 200); I am getting an error saying: The method draw(texture, float[], int, int) in the type SpriteBatch is not applicable for the arguments (SpriteBatch, int, int) So, LibGDX wants a float array to draw instead of a string? Thanks in advance.

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  • Should I use OpenGL or DX11 for my game?

    - by Sundareswaran Senthilvel
    I'm planning to write a game from scratch (a BIG Game, for commercial purpose). I'm aware that there are certain compute libraries like OpenCL, AMD APP SDK, C++ AMP as well as DirectCompute - both from MS (NOT interested in CUDA) are available in the market. I'm planning to write the game from the scratch, which includes the following engines... Physics Engine AI Engine Main Game Engine (... and if anything is missed). I'm aware that, there are some free physics engine libraries in the market. Not sure about free AI engine libraries. I'm bit confused in choosing between the OpenCL, AMD APP SDK, and C++ AMP libraries (as already mentioned i'm NOT interested in CUDA). I want my game to be published in Windows/Android/Mac OSX. It means it should be a cross-platform game. I will be having "one source code" that i'll compile for various platforms like Windows/Android/Mac OSX, and any others if i missed. Note: Since I'm NOT a Java guy, kindly do NOT suggest me the Java Language. For Graphics language should i use OpenGL or DirectX 11? I have heard that OpenGL runs on a single core, and not sure of DirectX 11. Between OpenGL and DirectX which one should i follow? or else, are there any other graphics language that i need to start with? I want to make use of the parallelism in GPU as well as CPU.

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  • Corona sdk events dispatched with dispatchEvent() are handled directly upon call. Why so?

    - by Amoxus
    I noticed to my surprise that an event created with dispatchEvent(event) gets handled directly when called, and not together with other events at a specific phase of the frame loop. Two main reasons of having an event system are: so that you can call code B from code A, but still want to prioritize code A. to make sure there are no freaky loopedy loops where code A calls code B calls code A ... I wonder what Ansca's rationale behind having events being handled directly this way is. And does Corona handle loopedy loops and other such pitfalls gracefully? The following code demonstrates dispatchEvent(): T= {} Z = display.newRect(100,100,100,100) function T.doSomething() print("T.doSomething: begun") local event = { name="myEventType", target=T } Z:dispatchEvent( event ) print("T.doSomething: ended") end function Z.sayHello(event) print("Z.sayHello: begun and ended") end Z:addEventListener("myEventType", Z.sayHello) print("Main: begun") T.doSomething() print("Main: ended") However Ansca claims the contrary at http://developer.coronalabs.com/reference/index/objectdispatchevent Can anyone clear this up a little? ( Using Corona simulator V 2012.840 )

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  • 2D Physics in a networked game (iOS)?

    - by Pedro
    I am researching the possibilities for a new iOS game. It's going to be a run-n-gun type platformer, and I'm looking into the possibility of co-op multiplayer. The game itself wouldn't be very physics intensive, there will most likely be 20-30 physics bodies at any given time. For the multiplayer, I think I would have one player "hosting" and up to 3 other connecting via the Internet. Here's my first question, are there any 2D physics engines that work over a network(preferably open source)? My second question, Does anyone have any thoughts on using a non-networked engine (like Box2D or Chipmunk) and adding the networking component? Since there would not be very much information sent, do you think it would cause a lot of lag?

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  • DirectX 9.0c and C++ GUI

    - by SullY
    Well, I'm trying to code a gui for my engine, but I've got some problems. I know how to make a UI overlay but buttons are still black magic for me. Anything I tried was to compilcated ( if it goes big ). To Example I tried to look if the mouse position is the same as the Pixel that is showing the button. But If I use some bigger areas it's getting to complicated. Now I'm searching for a Tutorial how to implement your own gui. I'm really confused about it. Well I hope you have/ know some good tutorials. By the way, I took a look at the DXUTSample, but it's to big to get overview.

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  • How do history generation algorithms work?

    - by Bane
    I heard of the game Dwarf Fortress, but only now one of the people I follow on Youtube made a commentary on it... I was more than surprised when I noticed how Dwarf Fortress actually generates a history for the world! Now, how do these algorithms work? What do they usually take as input, except the length of the simulation? How specific can they be? And more importantly; can they be made in Javascript, or is Javascript too slow? (I guess this depends on the depth of the simulation, but take Dwarf Fortress as an example.)

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  • In regards to applet games and UDP

    - by Tom Steinberg
    I've got about a year in Java experience, and would like to set up a server and client for an applet game. However, there doesn't appear to be any tutorials out there on anything like I want to use. I would the server to be able to store an array of x and y coordinates with a player name somehow associated to them, and send them to multiple clients in a short time span. I would like the client implemented in the applet, and be able to request any player's position data. I'd like to use UDP, because it seems to be the best option for efficient (if less reliable) transmission of data. If anyone could give me some pointers on how to do such a project, or point me to an appropriate tutorial, I'd certainly appreciate it.

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  • Binding BoundingSpheres to a world matrix in XNA

    - by NDraskovic
    I made a program that loads the locations of items on the scene from a file like this: using (StreamReader sr = new StreamReader(OpenFileDialog1.FileName)) { String line; while ((line = sr.ReadLine()) != null) { red = line.Split(','); model = row[0]; x = row[1]; y = row[2]; z = row[3]; elements.Add(Convert.ToInt32(model)); data.Add(new Vector3(Convert.ToSingle(x), Convert.ToSingle(y), Convert.ToSingle(z))); sfepheres.Add(new BoundingSphere(new Vector3(Convert.ToSingle(x), Convert.ToSingle(y), Convert.ToSingle(z)), 1f)); } I also have a list of BoundingSpheres (called spheres) that adds a new bounding sphere for each line from the file. In this program I have one item (a simple box) that moves (it has its world matrix called matrixBox), and other items are static entire time (there is a world matrix that holds those elements called simply world). The problem i that when I move the box, bounding spheres move with it. So how can I bind all BoundingSpheres (except the one corresponding to the box) to the static world matrix so that they stay in their place when the box moves?

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  • Is there any simple game that involves psychological factors?

    - by Roman
    I need to find a simple game in which several people need to interact with each other. The game should be simple for an analysis (it should be simple to describe what happens in the game, what players did). Because of the last reason, the video games are not appropriate for my purposes. I am thinking of a simple, schematic, strategic game where people can make a limited set of simple moves. Moreover, the moves of the game should be conditioned not only by a pure logic (like in chess or go). The behavior in the game should depend on psychological factors, on relations between people. In more details, I think it should be a cooperation game where people make their decisions based on mutual trust. It would be nice if players can express punishment and forgiveness in the game. Does anybody knows a game that is close to what I have described above? ADDED I need to add that I need a game where actions of players are simple and easy to formalize. Because of that I cannot use verbal games (where communication between players is important). By simple actions I understand, for example, moves on the board from one position to another one, or passing chips from one player to another one and so on.

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  • a flexible data structure for geometries

    - by AkiRoss
    What data structure would you use to represent meshes that are to be altered (e.g. adding or removing new faces, vertices and edges), and that have to be "studied" in different ways (e.g. finding all the triangles intersecting a certain ray, or finding all the triangles "visible" from a given point in the space)? I need to consider multiple aspects of the mesh: their geometry, their topology and spatial information. The meshes are rather big, say 500k triangles, so I am going to use the GPU when computations are heavy. I tried using arrays with vertices and arrays with indices, but I do not love adding and removing vertices from them. Also, using arrays totally ignore spatial and topological information, which I may need studying the mesh. So, I thought about using custom double-linked list data structures, but I believe doing so will require me to copy the data to array buffers before going on the GPU. I also thought about using BST, but not sure it fits. Any help is appreciated. If I have been too fuzzy and you require other information feel free to ask.

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  • Player Movement DirectX

    - by SullY
    I'm reading on a Book that's about Gamedevelopment with C++ and DirectX 9. There is something that interrests me: It says that playermovements are increasing with the power of the CPU. Becouse a faster CPU will move the player with every frame ( better CPU = better FPS ) To bypass it, it says you have just to multiplicate time*movementfactor . I'd like to know is there an another way to bypass it ?

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  • To sell or give for free

    - by QAH
    Hello everyone! I am currently making a game that I was originally planning to sell. It is a simple 2D arcade style game for the PC. I've seen many indie games become popular and generate revenue from advertisements, but the game itself remains free. I need some advice on whether or not I should sell my game, release it for free with advertisements, or ask for donations and keep the game free. I feel that my game is fun, but of course the graphics aren't tip top because I am a programmer, not an artist. I just take screenshots of 3D models I get from Turbosquid and crop around it to make a sprite. Also, and I could be very wrong about this, it seems that there are more legal issues surrounding selling a game than making it free and generating revenue from advertisement, or asking for donations. If I am wrong, someone please correct me. Also, I am very interested in generating some revenue for my work, but that isn't at the very top of my list. I am in my last year of high school, soon to be going to college, and I am going to major in computer science/software engineering. So I am trying to gain some preliminary experience at home by coding stuff every day. One way of getting this experience is by making this game. So what do you think? What route should I take? What has worked well with other indie games? Thanks in advance.

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  • Crash when using Cocos2d

    - by ipodfreak0313
    Sorry about the poor question title, it's just that this seems to big for a title. So here's the dirt: I am making a game (obviously) and I want the enemies to shoot (not necessarily at the player). I want the shoot method to be in the Enemies file, so as not to clutter up my HelloWorldLayer.m file even more. Here's what I'm using right now: HelloWorldLayer.m -(void)addEnemy:(BigAndStrongEnemy *)enemy { enemy = nil; if((arc4random() % 4) == 3) { enemy = [BigAndStrongEnemy enemy]; } else { enemy = [SmallAndFastEnemy enemy]; } if(buffDude.position.y > character.position.y || buffDude.position.y < (character.position.y + 10)) { } int rand = arc4random() % 320; if((arc4random() % 2 == 1)) { [enemy setPosition:ccp(0,rand)]; }else{ [enemy setPosition:ccp(480,rand)]; } [self animateEnemy:enemy]; [self addChild:enemy]; } -(void)animateEnemy:(BigAndStrongEnemy *)enemy2 { float randX = arc4random() % 480; float randY = arc4random() % 320; int rand = arc4random() % 320; CGPoint moveToPoint = CGPointMake(randX, (randY - rand)); [enemies addObject:enemy2]; action = [CCSequence actions: [CCMoveBy actionWithDuration:1 position:ccpMult(ccpNormalize(ccpSub(moveToPoint, enemy2.position)), 75)], [CCMoveBy actionWithDuration:3 position:ccp(buffDude.position.x,buffDude.position.y)], nil]; CCCallFuncO *a = [CCCallFuncO actionWithTarget:self selector:(@selector(shoot:)) object:enemy2]; CCSequence *s = [CCSequence actions:action,a, nil]; CCRepeatForever *repeat = [CCRepeatForever actionWithAction:s]; [enemy2 runAction:repeat]; } And here's the Shoot info from the Enemies class: Enemies.m: -(void)shoot:(id)sender { self = (BigAndStrongEnemy *)sender; [self shoot]; } -(void)spriteMoveFinished:(id)sender { CCSprite *b = (CCSprite *)sender; [self removeChild:b cleanup:YES]; } -(void)shoot { self = [CCSprite spriteWithFile:@"bigAndStrongEnemy.gif"]; CCSprite *b = [CCSprite spriteWithFile:@"bullet.gif"]; b.position = ccp(self.position.x,self.position.y); b.tag = 2; [self addChild:b]; [bullets addObject:b]; CGSize winSize = [[CCDirector sharedDirector] winSize]; CGPoint point = CGPointMake((winSize.width - (winSize.width - self.position.x)),0); [b runAction:[CCSequence actions: [CCMoveBy actionWithDuration:0.5 position:point], [CCCallFuncN actionWithTarget:self selector:@selector(spriteMoveFinished:)], nil]]; } Every time the 3 seconds goes by, the app crashes, and goes to the breakpoint in the CCCallFuncO file. I haven't touched it, is the thing. I am completely confused. Any help is greatly appreciated.

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  • touch in guiTexture

    - by Mitananda
    Before time in my game start. i want there will show a guiTexture.. if i touch this guiTexture, that will hidden and the time game will start. I try to make a script but it doesn't work. I'm a bit confused by the Unity documentation. please help me i'm newbie in Unity. my code : void Start () { if (myGuiTexture.HitTest(Input.GetTouch(0).position)) { if (Input.GetTouch(0).phase == TouchPhase.Began) { Time.timeScale = 1; myGuiTexture.enable = false; } } } and i also create this source but its doesn't work too. void Start () { if (tutorial.HitTest(new Vector3(0,0,0))){ Time.timeScale = 1; } }

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  • Do I need to be a genius to succeed in this field? [on hold]

    - by user46104
    I could not draw in high school only stick figures I have adhd but I thought some people with adhd/autism in this field are making inventions Do I have to be like michael angelo who could remember his dreams and drawed perfectly or is that someone else.Do I need to be able to read very fast like 30 books a year? sorry I never had a career counsellor who really supported me to dream big and to find me other people who can test if I am qualified for such dreams

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  • Unity mouse input not working in webplayer build

    - by Califer
    I have a button script with the following code void OnMouseDown() { animation.Play("button-squish"); enlarged = true; audio.PlayOneShot(buttonSound); } void OnMouseUpAsButton() { if (enlarged) { SelectThisButton(); enlarged = false; animation.Play("button-return"); } } void OnMouseExit() { if (enlarged) { enlarged = false; animation.Play("button-return"); } } It works great in the editor, but when I made a build and tested it in Chrome none of the buttons had any response. Further testing revealed that it did work in Firefox. Rather than telling people to change their browser if they want to play, I want to make the button code work. How else can I get the buttons to know when they're being pressed if the built-in stuff isn't working?

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  • Converting Degrees to X and Y Coordinate change

    - by gopgop
    I am using a float positioning system in my game. IE float x,y,z now I want to get the location of the mouse, then to fire an arrow to it. X0 = the players X location X1 = the mouse X location Y0 = the players Y location Y1 = the mouse Y location I want to make a method that the parameters are Degrees and it sets my Yspeed and my Xspeed accordingly to get to the mouse xy starting at player xy How do would I accomplish this?

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  • XNA 2D Top Down game - FOREACH didn't work for checking Enemy and Switch-Tile

    - by aldroid16
    Here is the gameplay. There is three condition. The player step on a Switch-Tile and it became false. 1) When the Enemy step on it (trapped) AND the player step on it too, the Enemy will be destroyed. 2) But when the Enemy step on it AND the player DIDN'T step on it too, the Enemy will be escaped. 3) If the Switch-Tile condition is true then nothing happened. The effect is activated when the Switch tile is false (player step on the Switch-Tile). Because there are a lot of Enemy and a lot of Switch-Tile, I have to use foreach loop. The problem is after the Enemy is ESCAPED (case 2) and step on another Switch-Tile again, nothing happened to the enemy! I didn't know what's wrong. The effect should be the same, but the Enemy pass the Switch tile like nothing happened (They should be trapped) Can someone tell me what's wrong? Here is the code : public static void switchUpdate(GameTime gameTime) { foreach (SwitchTile switch in switchTiles) { foreach (Enemy enemy in EnemyManager.Enemies) { if (switch.Active == false) { if (!enemy.Destroyed) { if (switch.IsCircleColliding(enemy.EnemyBase.WorldCenter, enemy.EnemyBase.CollisionRadius)) { enemy.EnemySpeed = 10; //reducing Enemy Speed if it enemy is step on the Tile (for about two seconds) enemy.Trapped = true; float elapsed = (float)gameTime.ElapsedGameTime.Milliseconds; moveCounter += elapsed; if (moveCounter> minMoveTime) { //After two seconds, if the player didn't step on Switch-Tile. //The Enemy escaped and its speed back to normal enemy.EnemySpeed = 60f; enemy.Trapped = false; } } } } else if (switch.Active == true && enemy.Trapped == true && switch.IsCircleColliding(enemy.EnemyBase.WorldCenter, enemy.EnemyBase.CollisionRadius) ) { //When the Player step on Switch-Tile and //there is an enemy too on this tile which was trapped = Destroy Enemy enemy.Destroyed = true; } } } }

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  • Isometric tile selection

    - by Dylan Lundy
    I'm not all that good with Maths. I'm trying to make a function to convert mouse coordinates into a particular tile in an isometric view. All of the algorithms I have seen so far work with the X & Y axes going diagonal, my game is currently set up like this, and I would like to keep it so. Is there an algorithm so that if the mouse was at the red dot, it would return the coordinates of the tile that it is sitting on? (6,2)

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  • How game characters are made?

    - by Ahmed
    I'm new here. I would like to know how game characters are made that are movable? What kind of software and engines are used for these characters? I will be working with my friends on our final year project. Our game will be FPS and I have to draw some animations for FPS view and other enemy character that can be programmed easily to make a good game. Sorry if my questions seems dumb, but if you need more explanation i'm always here to discuss Thanks in advance

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