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• Showing range on hexagonal grid

  - by user23673

  Here is the situation. I have hexagonal board,and a unit on it,with speed or move value 4.Diffrent terrain has a diffrent cost.When i click on the unit,game should show me a move range. My solution was to check each hex in range of 4,with A* pathfinding,and if path cost was less than 4 then this hex was in range.Finally game nicely show me range of that unit. My question is: Is there other solution to search for range on hex grids or square grid,because even if i am really proud of what i did in my solution,i think,it is a little to exaggerated?:)) What make me ask this question?I noticed that when unit speed is 4 or 6 or even 8,time to computing range for my computer was really good,but when speed was 10 and more i noticed that i needed to wait few second to compute.Well in real games i rather dont see something like this and my A* pathfinding is rather well optimized,so im thinking that my solution is wrong. Thanks for any replies.

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• Should I be worrying about limiting the number of textures in my game?

  - by Donutz

  I am working on a GUI in XNA 4.0 at the moment. (Before you point out that there are many GUIs already in existance, this is as much a learning exercise as a practical project). As you may know, controls and dialogs in Windows actually consist of a number of system-level windows. For instance, a dialog box may consist of a window for the whole dialog, a child window for the client area, another window (barely showing) for the frame, and so on. This makes detecting mouse hits and doing clipping relatively easy. I'd like to design my XNA GUI along the same lines, but using overlapping Textures instead of windows obviously. My question (yes, there's actually a question in this drivel) is: am I at risk of adversely affecting game performance and/or running low in resources if I get too nuts with the creating of many small textures? I haven't been able to find much information on how resource-tight the XNA environment actually is. I grew up in the days of 64K ram so I'm used to obsessing about resources and optimization. Anyway, any feedback appreciated.

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• Representing a world in memory

  - by user9993

  I'm attempting to write a chunk based map system for a game, where as the player moves around chunks are loaded/unloaded, so that the program doesn't run out of memory by having the whole map in memory. I have this part mostly working, however I've hit a wall regarding how to represent the contents of each chunk in memory because of my so far limited understanding of OOP languages. The design I have currently has a ChunkManager class that uses a .NET List type to store instances of Chunk classes. The "chunks" consist of "blocks". It's similar to a Minecraft style game. Inside the Chunk classes, I have some information such as the chunk's X/Y coordinate etc, and I also have a three dimensional array of Block objects. (Three dimensional because I need XYZ values) Here's the problem: The Block class has some basic properties, and I had planned on making different types of blocks inherit from this "base" class. So for example, I would have "StoneBlock", "WaterBlock" etc. So because I have blocks of many different types, I don't know how I would create an array with different object types in each cell. This is how I currently have the three dimensional array declared in my Chunk class: private Block[][][] ArrayOfBlocks; But obviously this will only accept Block objects, not any of the other classes that inherit from Block. How would I go about creating this? Or am I doing it completely wrong and there's a better way?

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• way to do if(x > x2) x = x2 with rotation?

  - by CyanPrime

  Alright, so I got this walking code, and some collision detection, now the collision detection returns a Vector3f of the closest point on the triangle that the projected position is at (pos + move), so then I project my position again in the walking method/function and if the projected position's x is the nearest point'x the projected position's x becomes the nearist point's x. same with their z points, but if I'm moving in a different direction from 0 degrees XZ how would I rotate the equation/condition? Here is what I got so far, and it's not working, as I go through walls, and such. Vector3f move = new Vector3f(0,0,0); move.x = (float)-Math.cos(Math.toRadians(yaw)); move.z = (float)-Math.sin(Math.toRadians(yaw)); // System.out.println("slopeNormal.z: " + slopeNormal.z + "move.z: " + move.z); move.normalise(); move.scale(movementSpeed * delta); float horizontaldotproduct = move.x * slopeNormal.x + move.z * slopeNormal.z; move.y = -horizontaldotproduct * slopeNormal.y; Vector3f dest = colCheck(pos, move, model, drawDist, movementSpeed, delta); Vector3f projPos = new Vector3f(pos); Vector3f.add(projPos, move, projPos); if(projPos.x > 0 && dest.x > 0 && projPos.x < dest.x) projPos.x = dest.x; else if(projPos.x < 0 && dest.x < 0 && projPos.x > dest.x) projPos.x = dest.x; if(projPos.z > 0 && dest.z > 0 && projPos.z < dest.z) projPos.z = dest.z; else if(projPos.z < 0 && dest.z < 0 && projPos.z > dest.z) projPos.z = dest.z; pos = new Vector3f(projPos);

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• Disposing of ContentManager increases memory usage

  - by Havsmonstret

  I'm trying to wrap my head around how memory management works in XNA 4.0 I've created a screen management test and when I close a screen, the ContentManager created by that screen is unloaded. I have used ANTS Memory Manager to look at how the memory usage is altered when I do this, and it gives me some results which makes me scratch my head. The game starts with loading two textures (435kB and 48,3kB) which puts the usage at about 61MB. Then, when I delete the screen and runs Unload on the ContentManager, the memory usage drops to 56,5MB but instantly after goes up to 64,8MB. Am I doing something wrong or is this usual for XNA games? Do I have to dispose of everything the ContentManager loads seperatly or do I need to do something more to the ContentManager? Thanks in advance!

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• Reasons why AppHub samples won't build?

  - by user13909

  I have an issue off of most downloaded projects where whenever I build it, VS2010 just crashes. I had this issue a while before, and it was widespread, I reinstalled, and it worked fine afterwards. If I create my own XNA project, and copy all of classes and assets over (which I admit, is super fun anyway) things build fine. But if I just download the project from here http://create.msdn.com/en-US/education/catalog/sample/roleplaying_game (RolePlayingGame_4_0_Win_Xbox.zip) and try to build, it automatically stops working, restarts, and reopens the project. If I Debug/Deploy to my Xbox, I do get a sucessful version to the Xbox, but VS2010 still stops and restarts. I've already repaired, and reinstalled again, still having the issue. Can anything think of plausible solutions?

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• How can I implement smooth rotation from one direction to another?

  - by user1759052

  I'm having a problem with animating rotations with 1Matrix.CreateRotationY() with my basic 3D game. Based on where you click the mouse, I want the 3D object to rotate to that direction and then move. I am using this to determine the target direction: float rot = (float)(Math.Atan2(X, Z)); It gives me the correct value, but I am not sure how to handle the rotation animation from current direction to new direction. I've tried a few things, but to no avail. Do you guys know of any good ways of solving this issue?

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• Sprite.js surface background

  - by user1086671

  I'm making a tile-based game using Sprite.js. It is not easy to redraw every tile each frame, so I tried to make a scrolling surface background. There is an example here http://batiste.dosimple.ch/sprite.js/tests/test_scrolling.html The example works, but it seems like ScrollingSurface.update is buggy or there is something I'm missing. What I tried to do is to draw 5x5 tiles and after 5 seconds draw another 5x5 tiles near the first ones. But it draws only the first ones. And surface.update() only updates the position of surface. Here is my code https://github.com/Sektoid/sprite.js/blob/master/tests/test_scrolling.html (You need also to set this.divider = 1.0 in scrolling.js to avoid drawing the same tiles 4 times.) There aren't any sprite.js-forums like with the other sprite- and game-engines have, so I'm asking here.

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• SDK mouse relative motion, weird results

  - by zaftcoAgeiha

  I have a simple SDL application that tracks the relative change in mouse position But for some reason, the motion.xrel and motion.yrel give back massive numbers! my code: SDL_WM_GrabInput(SDL_GRAB_ON); SDL_ShowCursor(false); while(!quit){ // Draw the scene if (invalidated == 1){ on_render(); invalidated = 0; } // And poll for events SDL_PumpEvents(); SDL_Event event; while ( SDL_PollEvent(&event) ) { switch (event.type) { case SDL_KEYDOWN: case SDL_KEYUP: on_key(event.key); break; case SDL_MOUSEMOTION: std::cerr << event.motion.xrel << ":" << event.motion.yrel << std::endl; invalidated = 1; break; ... and the printed results are ridiculous: 400:300 -11297:1705 -11215:1268 -10969:940 -10314:-43 -9986:-698 -9331:-1681 -9003:-2227 -8593:-2664 -8020:-3538 -7774:-3647 -7365:-4193 -7283:-4302 -7119:0 any idea why?? System is Ubuntu 12 running in virtual box

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• Drag and Drop Team Selection

  - by davidjwest

  I have a Fantasy F1 Website, currently users select their teams using dropdown menus. It works OK but isn't as user friendly as I would like. I would like to implement a drag and drop type of system, there's jQuery code out there that would go part of the way to allowing me to do this: http://jqueryui.com/demos/draggable/ But I am not sure about how to integrate that into PHP and MySQL, my jQuery skills are limited! I'd also need to stop them spending more than a certain amount of money, each driver has a value and the teams can only spend a certain amount of money. There's also limits for example you can only pick a driver once, but you can have three different drivers. Finally, how would you decide that the user had picked their team, I don't want a submit button as that kind of defeats the object of the exercise! Thanks for any advice, I don't expect anyone to write the code for me but some pointers would be greatly appreciated.

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• Aggro with Images

  - by Will

  I have three UIImageViews. enemy1, enemy1AggroBox and mainSprite. What I want to do is when mainSprite and enemy1AggroBox interect, I want enemy1 to start moving towards mainSprite. Basically creating aggro for a game. if(CGRectIntersectsRect(mainSprite.frame, enemy1AggroBox.frame)){ //Code here// } My plan would be to call this method in viewDidLoad. I'm not using any sort of framework like cocos2d or OpenGLES. If you need to see any more code just ask.

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• Is there any small linux distribution which comes with a complete C devleopment environment

  - by hits_lucky

  Hi, I have installed "Damn Small Linux" on my home computer for doing C development in unix. But the distribution doesn't by default come with the C development environment and I am facing some issues when trying to install the gcc. Is there any other small Linux distribution which by default has the required packages for the C development. And also I don't want additional software which takes up lot of space but still would like to have the graphical environment. Thanks

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• How do I correctly multiply an XMMATRIX by a scalar?

  - by user43129

  Using DirectXMath and its XMMATRIX structure in C++ and Direct X 11, how does one multiply that matrix structure by a single float scalar? I want to implement the operation B = A * f; where A and B are XMMATRIX and f is a float. I found all sorts of functions to multiply a matrix by another matrix or a vector. I found all sorts of functions to construct matrices. I could find no scalar multiplication! Why is there no such function? Is there no use case? Did I miss something? How do I implement scalar multiplication?

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• Can i add friction in air?

  - by Diken

  I have issue regarding speed in air. When i jump and move simultaneously that time speed of player increase.For jump i am using impuls and for movement i am using force.I want to slow speed when player is in air. Thanks in advance Following is my update method ih HUDLayer -(void)update:(ccTime)dt :(b2Body *)ballBody :(CCSprite *)player1 :(b2World *)world { if (moveRight.active==YES) { ballBody->SetActive(true); b2Vec2 locationworld=b2Vec2(maxSpeed,0); double mass=ballBody->GetMass(); ballBody->ApplyForce(mass*locationworld, ballBody->GetWorldCenter()); // ballBody->SetLinearDamping(1.2f); } else if(moveLeft.active==YES) { ballBody->SetActive(true); b2Vec2 locationworld=b2Vec2(-10,0); double mass=ballBody->GetMass(); ballBody->ApplyForce(mass*locationworld, ballBody->GetWorldCenter()); // ballBody->SetLinearDamping(1.2f); } } Following is jump -(void)jump:(b2Body*)ballBody:(ccTime)dt:(BOOL)touch { if (touch) { if (jumpSprte.active==YES) { ballBody->SetActive(true); b2Vec2 locationWorld; //locationWorld=b2Vec2(0.0f,98.0f); locationWorld=b2Vec2(0,32); // double mass=ballBody->GetMass(); ballBody->ApplyLinearImpulse(locationWorld, ballBody->GetWorldCenter()); // ballBody->ApplyForce(mass*locationWorld, ballBody->GetWorldCenter()); ballBody->SetLinearDamping(1.2f); } } } So where i apply logic??

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• Dynamic object creation with HashMap

  - by Salor

  I want to use a HashMap to dynamically create objects based on the key. I have a Random Map Generator that stores the maps in 3D Arrays of Type Integer[][][]. Upon creation of the actual map I iterate through this array and based on the Integer I want to create the right block. Example: Integer[][][] map ... map[6][6][6] = 3; 3 is a Earth-Block and now I want to initialize a new Block of this type and give it the right coordinates. Currently I store my Bindings from Integer to Class in a HashMap(Integer, String) and create my objects like that: int id = array[x][y][z]; String block_name = Blocks.map.get(id); Block block = (Block) Class.forName(block_name).newInstance(); block.setPosition(x,y,z); But I want to avoid newInstance() if possible. I've never worked that dynamically with Java before and I couldn't find a solution like changing the HashMap to (Integer, Class) or something. I just need to create a new Object based upon the Integer. Any ideas/solutions? Thanks in advance and have a wonderful day!

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• Basic/research RTS engine/model

  - by XTF

  Does a basic/research RTS engine/model exist that can be used as a basis for further experimentation/research? I'd like to avoid reinventing the wheel if possible. I'm aware of Spring Engine and Stratagus, but those are real game engines and may not be the best to experiment with and learn from. Ideally the docs for the model would answer questions like: How exactly do units move? (constant velocity? constant acceleration? constant force?) How is pathfinding handled? Does every grid cell become an A* graph node (may be expensive)? Does it consider threats? How are groups handled? (w.r.t pathfinding and movement) How is combat handled? I'm mostly interested in the low-level model details (for now), not the graphics etc. I've read a lot of the other quesions (and answers/references) tagged RTS but I haven't found my answer yet.

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• Scene or Activity Animation

  - by Siddharth

  My game require an animation when one activity finishes and next started because I have develop game with multiple activity not as multiple scene per game. I have to show animation at the time of activity creation and activity destroy. I have trying to create basic animation that was supported by android. And all that xml file I have to post it into the anim folder but the loading of resource was so much high so any type of animation I provide using android method does not work for me it look weird. If scene class has some functionality for animation that please know me then I try to load different type of animation using scene. I have not create multiple scene because I have no awareness about how to manage multiple scene in andengine though I have a working experience of 8 months in andengine. So this help also provide me a great help. Basically I want to create animation like one activity slide out at the same time the other activity slide in. So at a time user can see the transition of activity. Thanks in advance.

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• Getting current time in milliseconds

  - by user90293423

  How to get the current time in milliseconds? I'm working on a hacking simulation game and when ever someone connects to another computer/NPC, a login screen popups with a button on the side called BruteForce. When BruteForce is clicked, what i want the program to do is, calculate how many seconds cracking the password is going to take based on the player's CPU speed but that's the easy part. The hard part is i want to enter a character in the password's box every X milliseconds based on a TimeToCrack divided by PasswordLength formula. But since i don't know how to find how many milliseconds have elapsed since the second has passed, the program waits until the CurrentTime is higher than the TimeBeforeTheLoopStarted + HowLongItTakesToTypeaCharacter which is always going to be a second. How would you handle my problems? I've commented the game breaking part. std::vector<QString> hardware = user.getHardware(); QString CPU = hardware[0]; unsigned short Speed = 0; if(CPU == "OMG SingleCore 1.8GHZ"){ Speed = 2; } const short passwordLength = password.length(); /* It's equal to 16 */ int Time = passwordLength / Speed; double TypeSpeed = Time / passwordLength; time_t t = time(0); struct tm * now = localtime(&t); unsigned short EndTime = (now->tm_sec + Time) % 60; unsigned short CurrentTime = 0; short i = passwordLength - 1; do{ t = time(0); now = localtime(&t); CurrentTime = now->tm_sec; do{ t = time(0); now = localtime(&t); }while(now->tm_sec < CurrentTime + TypeSpeed); /* Highly flawed */ /* Do this while your integer value is under this double value */ QString tempPass = password; tempPass.chop(i); ui->lineEdit_2->setText(tempPass); i--; }while(CurrentTime != EndTime);

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• Get all triangles that are < N dist from you?

  - by CyanPrime

  Does anyone know of a way I could add a radius to this code for p? Like basically saying "this is true if the triangle is < N dist from the point" public boolean isPointInTriangle( Vector3f p, Vector3f a, Vector3f b, Vector3f c ) { return ( pointsAreOnSameSide(p, a, b, c) && pointsAreOnSameSide(p, b, a, c) && pointsAreOnSameSide(p, c, a, b) ); } public boolean pointsAreOnSameSide( Vector3f p1, Vector3f p2, Vector3f a, Vector3f b ) { Vector3f diffba = new Vector3f(0,0,0); Vector3f.sub( b, a, diffba ); Vector3f diffp1a = new Vector3f(0,0,0); Vector3f.sub( p1, a, diffp1a ); Vector3f diffp2a = new Vector3f(0,0,0); Vector3f.sub( p2, a, diffp2a ); Vector3f cross1 = Vector3f.cross(diffba, diffp1a); Vector3f cross2 = Vector3f.cross(diffba, diffp2a); return ( Vector3f.dot( cross1, cross2 ) >= 0 ); }

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• Bubble sorting my array does not sort it

  - by Trixmix

  I sort an array of chunks by doing this: for (int i =0; i<this.getQueue().size();i++) { for (int j =0; j<this.getQueue().size()-i-1;j++) { Chunk temp1 = this.getQueue().get(i); Chunk temp2 = this.getQueue().get(i+1); if (temp1 != null &&temp2 != null && temp2.getLocation().getY() < temp1.getLocation().getY()) { this.getQueue().set(i, temp2); this.getQueue().set(i+1, temp1); } } } What I want is the the chunks with the lowest Y coordinate will be at the start of the array and the ones with the bigger Y coordinate will be at the end of the array. And this is my result: 1024.0 944.0 1104.0 944.0 1104.0 ----BEFORE----- 944.0 1024.0 944.0 1104.0 1104.0 ---AFTER--- Why is this not working It seams fine. I dont want to use a comparator so dont suggest it. More info, the Y cords are floats. I got the result by for each looping on this queue and printed the Y locations.

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• Resource Managers - Are they any good?

  - by The Communist Duck

  Hey. I've seen many a time in source code, things like this [well, this is more of a pseudo C++ idea of mine] type defshared_ptr ResourcePtr;// for ease ResourcePtr sound1 = resourceManager.Get("boom.ogg"); sound1-Play(); ResourcePtr sprite = resourceManager.Get("sprite.png"); I was just wondering how useful a class like this was, something that: Loaded media files Stored them in memory Did this at the start of a level - loading screen. Cleaned up Rather than having a system of: Resources are held by entities only, or loose. Responsible for own load into memory. The first is a 'manager' as such; something I feel indicates it's wrong to use. However, it allows for something like a vector of resource names to be passed, rather than having to scramble around finding everything that needs to be loaded.

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• Is it legal to develop a game usung some version of D&D, something similar to Baldurs Gate?

  - by Max

  For a while now I've been thinking about trying my hand at creating a game similar in spirit and execution to Baldurs Gate, Icewind Dale and offshoots. I'd rather not face the full bulk of work in implementing my own RPG system - I'd like to use D&D rules. Now, reading about the subject it seems there is something called "The License" which allows a company to brand a game as D&D. This license seems to be exclusive, and let's just say I don't have the money to buy it :p. Is it still legal for me to implement and release such a game? Commercially or open-source? I'm not sure exactly which edition would fit the best, but since Baldurs Gate is based of 2nd edition, could I go ahead an implement that? in short: what are the issues concerning licensing and publishing when it comes to D&D? Also: Didn't see any similar question...

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• Can you run OpenGL 2.0 on modern machines?

  - by thePalindrome

  I'm looking to get into 3d with OpenGL, using SDL to help with other stuff. I found plenty of good tutorials (lazyfoo is a big one), but "Learning Modern 3d Graphics Programming" uses a newer version of openGL that I'm not able to run! I opened up OpenGL extensions viewer, and I can only run OpenGL 2.0, whereas most tutorials are in higher versions. I ask this because I've heard that just about everything in 2.* got depreciated in the newer versions, so I'm worried that my code might not work. I'm looking at a few other tutorials, but I'm so used to SDL that those just confuse me... So should I bother trying to do graphics programming now, or should I just wait until I can upgrade my computer?

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• I want to begin in this world, where can i meet information,help and people to start? [on hold]

  - by SYNOXYS

  So like the question says, I really want to begin to create something,or help creating something. I mess around with some 2d and 3d softwares like unity,gamemaker,UE... and tried to modelate (maya,3dmax),I use them a little,nothing professional, but all i've got is the sensation that i can't go really far. I feel like i am learning really slow, even having the will and some basics knows. But I want to change that, i want to really learn, to progress. I think that a good idea is meeting people like me, and start a non-commercial project or something. Thanks for your time,really. Greetings, SYNOXYS.

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• C++ game programming

  - by UnTraDe

  Until now I have been using C# with XNA for 2d and a little bit of 3d games, althought I dont remember that I finished any of them I want to start working with C++. I have a very very little exprience with C++ and my question is where to start? I plated a little bit with SFML and I encountered some problems with performance when I started to build a tile based game. I'm pretty sure that the problem is my code and not the library itself. Is there anything similiar to XNA for C++? I should keep try and work with SFML? Sorry for my bad english! Thanks in advance!

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