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• How can I tweak this A* search pathfinding algorithm to handle different terrain movement values?

  - by user422318

  I'm creating a 2D map-based action game with similar interaction design as Diablo II. In other words, the player clicks around a map to move their player. I just finished player movement and am moving on to pathfinding. In the game, enemies should charge the player's character. There are also five different terrain types that give different movement bonuses. I want the AI to take advantage of these terrain bonuses as they try to reach the player. I was told to check out the A* search algorithm (http://en.wikipedia.org/wiki/A*_search_algorithm). I'm doing this game in HTML5 and JavaScript, and found a version in JavaScript: http://www.briangrinstead.com/blog/astar-search-algorithm-in-javascript I'm trying to figure out how to tweak it though. Below are my ideas about what I need to change. What else do I need to worry about? When I create a graph, I will need to initialize the 2D array I pass in passed on with a traversal of a map that corresponds to the different terrain types. in graph.js: "GraphNodeType" definition needs to be modified to handle the 5 terrain types. There will be no walls. in astar.js: The g and h scoring will need to be modified. How should I do this? in astar.js: isWall() should probably be removed. My game doesn't have walls. in astar.js: I'm not sure what this is. I think it indicates a node that isn't valid to be processed. When would this happen, though? At a high level, how do I change this algorithm from "oh, is there a wall there?" to "will this terrain get me to the player faster than the terrain around me?" Because of time, I'm also debating reusing my Bresenham algorithm for the enemies. Unfortunately, the different terrain movement bonuses won't be used by the AI, which will make the game suck. :/ I'd really like to have this in for the prototype, but I'm not a developer by trade nor am I a computer scientist. :D If you know of any code that does what I'm looking for, please share! Sanity check tips for this are also appreciated.

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• I am looking to make a spaceship tilt as it corners but I cant get it to return

  - by bobthemac

  I am using the TL game engine I am not allowed to use a physics engine but I need to make the spaceship lean as it corners, I can make it lean but cannot make it return to its starting position. I have looked at implementing some kind of spring physics but I don't understand it. Here is my code so far if(myEngine->KeyHeld(Key_A)) { car->RotateY(carSteer * frameTime); if(carSteer >= -carMaxSteer) { carSteer -= carSteerIncrement; car->RotateLocalZ(-(carSteer * frameTime)); } } if(!myEngine->KeyHeld(Key_A)) { if(carSteer < 0) { carSteer = 0; } } if(myEngine->KeyHeld(Key_D)) { car->RotateY(carSteer * frameTime); if(carSteer <= carMaxSteer) { carSteer += carSteerIncrement; car->RotateLocalZ(-(carSteer * frameTime)); } } if(!myEngine->KeyHeld(Key_D)) { if(carSteer > 0) { carSteer = 0; } } All the functions I am calling are built into the engine and I did not write them. Any Help Would Be Appreciated Thanks.

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• Why does my goblin only choose a walk direction once?

  - by Eogcloud

  I'm working on a simpe 2d canvas game that has a small goblin sprite who I want to get pathing around the screen. What I originally tried was a random roll that would choose a direction, the goblin would walk that direction. It didnt work effectively, he sort of wobbled in one spot. Here's my current apporach but he only runs in a rundom direction and doesnt change. What am I doing wrong? Here's all the relevant code to the goblin object and movement. var goblin = { speed: 100, pos: [0, 0], dir: 1, changeDir: true, stepCount: 0, stepTotal: 0, sprite: new Sprite( goblinImage, [0,0], [30,45], 6, [0,1,2,3,2,1], true) }; function getNewDir(){ goblin.dir = Math.floor(Math.random()*4)+1; }; function checkGoblinMovement(){ if(goblin.changeDir){ goblin.changeDir = false; goblin.stepCount = 0; goblin.stepTotal = Math.floor(Math.random*650)+1; getNewDir(); } else { if(goblin.stepCount === goblin.stepTotal){ goblin.changeDir = true; } } }; function update(delta){ healthCheck(); if(isGameOver){ gameOver(); } if(!isGameOver){ updateCharLevel(); keyboardInput(delta); moveGoblin(delta); checkGoblinMovement(); goblin.sprite.update(delta); //update sprites if(mainChar.kills!=0 && bloodReady){ for(var i=0; i<bloodArray.length; i++){ bloodArray[i].sprite.update(delta); } } //collision detection if(collision(mainChar, goblin)) { combatOutcome(combatEvent()); combatCleanup(); } } }; function main(){ var now = Date.now(); var delta = (now - then)/1000; if(!isGameOver){ update(delta); } draw(); then = now; }; function moveGoblin(delta){ goblin.stepCount++; if(goblin.dir === 1){ goblin.pos[1] -= goblin.speed * delta* 2; if(goblin.pos[1] <= 85){ goblin.pos[1] = 86; } } if(goblin.dir === 2){ goblin.pos[1] += goblin.speed * delta; if(goblin.pos[1] > 530){ goblin.pos[1] = 531; } } if(goblin.dir === 3){ goblin.pos[0] -= goblin.speed * delta; if(goblin.pos[0] < 0){ goblin.pos[0] = 1; } } if(goblin.dir === 4){ goblin.pos[0] += goblin.speed * delta* 2; if(goblin.pos[0] > 570){ goblin.pos[0] = 571; } } };

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• Do I lose/gain performance for discarding pixels even if I don't use depth testing?

  - by Gajoo

  When I first searched for discard instruction, I've found experts saying using discard will result in performance drain. They said discarding pixels will break GPU's ability to use zBuffer properly because GPU have to first run Fragment shader for both objects to check if the one nearer to camera is discarded or not. For a 2D game I'm currently working on, I've disabled both depth-test and depth-write. I'm drawing all objects sorted by their depth and that's all, no need for GPU to do fancy things. now I'm wondering is it still bad if I discard pixels in my fragment shader?

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• Best way to create neon glow line effect in AS3?

  - by Phil

  What's the best way to create a neon glow line effect in Flash AS3? Say similar to what's going on in the game gravitron360 on the xbox 360? Would it be a good idea to create movieclips with plain lines drawn in them and then apply a glow filter to them? or perhaps just apply the glow filter to the entire movieclip layer the movieclips are on? or just draw them manually and create a glow effect by converting the lines to fills and then softening edges? (wouldn't blend as well but would be the fastest CPU wise?) Thanks for any help

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• Game planning and software design? I feel that UML is not convenient

  - by user1542

  In my university, they always emphasize and hype about UML design and stuff, in which I feel it is not going to work well with game structure design. Now, I just want a professional advice on how should I begin my game designing? The story is I have some skill in programming and have done many minor game such as getting some 2D platformer working to some extend. The problems that I find about my program is the poor quality design. After coding for a while, things start to break down due to poor planning (When I add new feature, it tends to make me have to recode the whole program). However, to plan everything out without a single design flaw is a bit too ideal. Therefore, any advice to how should I plan my game? How should I put it into visible pictures, so that me and my friends are able to overview the designs? I planned to start coding a game with my friend. This is going to be my first teamwork, so any professional advices would be a pleasure. Is there any other alternatives than UML? Another question is how does "prototyping" normally looks like?

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• XNA 2D Rotated Rectangle Collision Response

  - by Kyle Uithoven

  I am using Rotated Rectangles which collide using the Separating Axis Theorem and they work perfectly fine for collision detection using Intersects and Contains. However, I am starting to use faster objects in my game now and there is the issue of the two object overlapping during collision due to their higher velocities. I would like to do a collision response where I find out how much they are overlapping in the X and Y and put position them outside of each other. I would like to use something like this: http://go.colorize.net/xna/2d_collision_response_xna/index.html. But I am having some issues trying to adapt this to handle the rotation of the bounds. Is this possible? Are there any resources out there that I can look at?

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• How to populate a form list with buttons using javascript

  - by StealingMana

  I made a script that, when you press one button(accessories) the selection(mylist) populates with one array(accessoryData), and when you hit the other button(weapons) the other array(weaponData) populates the selection. However, in the current state of the code the second button press is not re-populating the selection. What is wrong here? Also if there is a more efficient way to do this, that might be helpful. Full code function runList(form, test) { var html = ""; var x; dataType(test); while (x < dataType.length) { html += "<option>" + dataType[x]; x++; } document.getElementById("mylist").innerHTML = html; }

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• Can I have a workspace that is both a git workspace and a svn workspace?

  - by Troy

  I have checked out now a local working copy of a codebase that lives in an svn repo. It's a big Java project that I use Eclipse to develop in. Eclipse of course builds everything on the fly, in it's own way with all the binaries ending up in [project root]/bin. That's perfectly fine with me, for development, but when the build runs on the build server, it looks quite a lot different (maven build, binaries end up in a different directory structure, etc). Sometimes I need to recreate the build server environment on my local development system to debug the build or what have you, so I usually end up downloading an entirely new working copy into a new workspace and running the build from there (prevents cluttering my development workspace with all the build artifacts and dirtying up the working copy). Of course sometimes I'm interested in running the full build on code that I don't want to check in yet, so I will manually copy over the "development" workspace onto the "build" workspace. Besides taking a lot of extra time copying a lot of files that I don't actually need (just overlaying the new over the old), this also screws up my svn metadata, meaning that I can't check in changes from that "build workspace" working copy, and I often end up having to re-download the code to get it back into a known state. So I'm thinking I make my svn working copy a local git repo, then "check out" the in-development code from the svn working copy/git master, into the local build workspace. Then I can build, revert my changes, have all the advantages of a version controlled working copy in the build workspace. Then if I need to make changes to the build, push those back into the git master (which is also a svn working copy), then check them into the main svn repo. |-------------| |main svn repo| <------- |---------------------| |-------------| |svn working copy | <------- |--------------------| | (svn dev workspace/ | | non-svn-versioned | | git master) | | build workspace | |---------------------| | (git working copy) | |--------------------| Just switching everything to git would obviously be better, but, big company, too many people using svn, too costly to change everything, etc. We're stuck with svn as the main repo for now. BTW, I know there is a maven plugin for Eclipse and everything, I'm mainly interested to know if there is a way to maintain a workspace that is both a git working copy and an svn working copy. Actually any distributed version control system would probably work (hg possibly?). Advice? How does everybody else handle this situation of having a to manage both a "development" build process and a "production" build process?

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• LibGDX onTouch() method kill on touch

  - by johnny-b

  How can I add this on my application. i want to use the onTouch() method from the implementation of the InputProcessor to kill the enemies on screen. how do i do that? do i have to do anything to the enemy class? please help Thank you M @Override public boolean touchDown(int screenX, int screenY, int pointer, int button) { return false; } here is my enemy class public class Bullet extends Sprite { private Vector2 velocity; private float lifetime; public Bullet(float x, float y) { velocity = new Vector2(0, 0); } public void update(float delta) { float targetX = GameWorld.getBall().getX(); float targetY = GameWorld.getBall().getY(); float dx = targetX - getX(); float dy = targetY - getY(); float distToTarget = (float) Math.sqrt(dx * dx + dy * dy); velocity.x += dx * delta; velocity.y += dy * delta; } } i am rendering all graphics in a GameRender class and a gameworld class if you need more info please let me know Thank you

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• How does N create it's tileset?

  - by Darestium

  I am trying to recreate a Multiplayer version of the popular flash game N in java. I have a single question however. Are the tiles for the games draw or are they defined with mathamatical formulars/In code? Since I do see how they would scale up in flash if they were not. So if anyone has any ideas how I should go about creating the tileset, or how they are created in the game please let me know. You can check out the game here.

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• Dropping multiple objects using an array in Actionscript?

  - by Eratosthenes

  I'm trying to get these fireBalls to drop more often, I'm not sure if I'm using Math.random correctly. Also, for some reason I'm getting a null reference because I think the fireBalls array waits for one to leave the stage before dropping another one? This is the relevant code: var sun:Sun=new Sun var fireBalls:Array=new Array() var left:Boolean; function onEnterFrame(event:Event){ if (left) { sun.x = sun.x - 15; }else{ sun.x = sun.x + 15; } if (fireBalls.length>0&&fireBalls[0].y>stage.stageHeight){ // Fireballs exit stage removeChild(fireBalls[0]); fireBalls.shift(); } for (var j:int=0; j<fireBalls.length; j++){ fireBalls[j].y=fireBalls[j].y+15; if (fireBalls[j].y>stage.stageHeight-fireBall.width/2){ } } if (Math.random()<.2){ // Fireballs shooting from Sun var fireBall:FireBall=new FireBall; fireBall.x=sun.x; addChild(fireBall); fireBalls.push(fireBall); } }

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• Should I drawing directly on CCLayer or CCSprite?

  - by einverne

  Now I am a little confused in my cocos2d-x cpp project. I want to draw lines with user's finger touch. Following the screenshot of a CCScene: In the screen, there are two squares. I want show an animation in the first square and let the second one draw lines with user touch. Now these two squares are CCSprite. And I can draw dots in the second one on the CCLayer. But I am little confused that I should draw lines on the Sprite or on the Layer. Or are there other ways to organize the code?

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• How can I perform a masked erase in SDL2?

  - by Kvisle

  I'm trying to implement some shadow/lighting effects in my 2D-project, and I've concluded that if there is an easy way to perform a masked erase on an SDL_Texture, it would make the drawing operations quite cheap. Let's say I have a texture of the part of the level where light is not meant to be rendered. I also have a texture with my "light map"; I want to use this to just draw omni lights from my light sources. Then I want to use the first image to 'subtract' the portions of the light map that are not to be rendered on the final scene. Then I draw my "light map" texture on top of my scene, with additive blending enabled. This sounds like a good theory in my head, but I can't see any functions in the SDL2 API that let me do masked erase from a texture. Am I overlooking something? Does anything like this exist?

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• Game Server on Windows Azure

  - by MrWiggels

  What do you guys think of using Windows Azure for deploying a custom built game server. It's being built in C#, and I want to get a few things down before stretching too far into the project. I like the idea of being scalable, but I also know that I will never get to the scale of anything to the scale of WOW, or something quite as big. It will just be an interesting journey to test something like this. So, will Windows Azure work for that, or is there any other services that can provide something like that?

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• Getting an object from a 2d array inside of a class

  - by user36324

  I am have a class file that contains two classes, platform and platforms. platform holds the single platform information, and platforms has an 2d array of platforms. Im trying to render all of them in a for loop but it is not working. If you could kindly help me i would greatly appreciate. void Platforms::setUp() { for(int x = 0; x < tilesW; x++){ for(int y = 0; y < tilesH; y++){ Platform tempPlat(x,y,true,renderer,filename,tileSize/scaleW,tileSize/scaleH); platArray[x][y] = tempPlat; } } } void Platforms::show() { for(int x = 0; x < tilesW; x++){ for(int y = 0; y < tilesH; y++){ platArray[x][y].show(renderer,scaleW,scaleH); } } }

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• What technology to use for turn-based game server? [closed]

  - by mekanikus

  If I create a mobile turn-based game which could consist from 2 up to 6 players. I expect the server to support for about hundreds of game. And I aim for something free and not costly technology. What software and hardware recommendation would be enough for me? I've found some game server engine such as photon. But is it too much for a simple game? I'm thinking of using REST technology with F3 PHP server and Mysql. Will it be adequate? Will only one physical server enough? What is the hardware recommendation for the server?

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• How do I find actors in an area on a poly-precise basis?

  - by Almo

  Ok, I've been asking various questions and getting some good answers, but I think I need to rethink my method, so I'll describe the problem. I have a player who has a big blue box in front of him. This box shows which KActors will be pushed when he pulls the trigger: Currently, the blue box spawns a descendant of Actor which checks collision to see which KActors are touching it: foreach Owner.TouchingActors(class'DynamicSMActor', DynamicActorItt) { // do stuff } The problem is, if you check for touching between Actors and KActors, it looks like it does a plain axis-aligned bounding-box collision. The power will push the box on the lower right, when it's clear it's not touching the blue box. How should I do this properly? I just need a way to find out which KActors are touching that area, on a poly-by-poly level. These collisions are only done with rectangular boxes and simple sphere collision; we are aware of the potential for performance issues with complex objects and poly-collision. I've tried making the collision checker a KActor, but it doesn't report any TouchingActors. This issue is causing us trouble in a lot of other places as well. So solving this problem is a core issue in our game.

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• How to avoid movement speed stacking when multiple keys are pressed?

  - by eren_tetik

  I've started a new game which requires no mouse, thus leaving the movement up to the keyboard. I have tried to incorporate 8 directions; up, left, right, up-right and so on. However when I press more than one arrow key, the movement speed stacks (http://gfycat.com/CircularBewitchedBarebirdbat). How could I counteract this? Here is relevant part of my code: var speed : int = 5; function Update () { if(Input.GetKey(KeyCode.UpArrow)){ transform.Translate(Vector3.forward * speed * Time.deltaTime); } else if(Input.GetKey(KeyCode.UpArrow) && Input.GetKey(KeyCode.RightArrow)){ transform.Translate(Vector3.forward * speed * Time.deltaTime); } else if(Input.GetKey(KeyCode.UpArrow) && Input.GetKey(KeyCode.LeftArrow)){ transform.rotation = Quaternion.AngleAxis(315, Vector3.up); } if(Input.GetKey(KeyCode.DownArrow)){ transform.Translate(Vector3.forward * speed * Time.deltaTime); } }

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• How much isometric sprites can one optimize by mirroring and alike?

  - by Tom

  I am working on a basic isometric game, and am struggling to find the correct mirrors. I have managed to get SE out of SW, by scaling the sprite on X axis by -1. Same applies for NE angle. Something is bugging me, that I should be able to also mirror N to S, but I cannot manage to pull this one off. Am I just too sleepy and trying to do the impossible, or a basic -1 scale on Y axis is not enough? What are the common used mirror table for optimizing 8 angle (N, NE, E, SE, S, SW, W, NW) isometric sprites?

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• CLR Profiler Allocated Bytes and XNA ContentManager

  - by Vackup

  I've been fighting with XNA ContentManager and memory allocations for some weeks because I'm trying to port my game from XNA (Windows) to ExEn / Monotouch (iphone). The problem is that after playing a few levels, my game exits unexpectedly on a real iPhone device (not simulator). Profiling memory usage on Windows with CLRProfile, I found some useful stuff but I also found something I dont understand. If I use 2 ContentManagers (1 for shared assets and 1 for level assets), when profiling, "Allocated Bytes" grows and grows after level through level but Memory consumption measured by Windows Task Manager stays constant (down when I unload the content manager and up again when I load content). Obviously, I contentManager.Unload() when level ends. After a few levels my game exits unexpectedly on an iPhone device. If I use 1 content manager, "CRLProfiler Allocated Bytes" stays constant on Windows and on the iPhone; I can play the game normally and it doesnt exit unexpectedly. I use the same assets level through level. It seems like in ios (iPhone) when loading and unloading the same assets, it allocates memory and consumes all device memory, so the ios kill it. Can anybody explain me how this really works? I've read quite a bit, but I still don't understand what's going on.

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• How do I swap two objects in a GC language without triggering GC?

  - by TenFour04

  I have two array lists. that I want to swap each frame. My question is, does the variable 'temp' need to be a member variable to avoid triggering GC, assuming this method is called on dozens of objects each frame? I'm not creating a new object, just a new reference to an object. public void LateUpdate(){ ArrayList<int> temp = previousFrameCollisions; previousFrameCollisions = currentFrameCollisions; currentFrameCollisions = temp; currentFrameCollisions.clear(); } I've been told there's no reason to make a primitive into a member variable just to avoid GC, so my best guess is that this also applies to object references.

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• Detect click on Triangle and Circle buttons

  - by chr1s89

  How can i detect clicks on a texture (will be a button in my game) that has a form of a triangle or circle. I know only the rectangle solution where u can use the positions + the width/height but this dont work for that because clicks will be detected at the transparent pixels. I heard of pixel-perfect collision is it the right way for this? It would be great if someone can give me a example for such a solution or other.

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• What is causing this behavior with the movement of Pong Ball in 2D? [closed]

  - by thegermanpole

  //edit after running it through the debugger it turned out i had the display function set to x,x...TIL how to use a debugger I've been trying to teach myself C++ SDL with the lazyfoo tutorial and seem to have run into a roadblock. The code below is the movement function of my Dot class, which controls the ball. The ball seems to ignore yvel and moves with xvel to the bottom right. The code should be pretty readable, the rest of the relevant facts are: All variables are names Constants are in caps dotrad is the radius of my dot yvel and xvel are set to 5 in the constructor The dot is created at x and y equal to 100 When I comment out the x movement block it doesn't move, but if i comment out the y movement block, it keeps on going down to the right. void Dot::move() { if(((y+yvel+dotrad) <= SCREEN_HEIGHT) && (0 <= (y-dotrad+yvel))) { y+=yvel; } else { yvel = -1*yvel; } if(((x+xvel+dotrad) <= SCREEN_WIDTH) && (0 <= (x-dotrad+xvel))) { x +=xvel; } else { xvel = -1*xvel; } }

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• How do I rotate a sprite with ccbezierTo in cocos2d-x?

  - by user1609578

  In cocos2d-x, I move a sprite with ccbezierTo like this: // use for ccbezierTo bezier.controlPoint_1 = ccp(m_fish->getPositionX() + 200, visibleSize.height/2 + 300); bezier.controlPoint_2 = ccp(m_fish->getPositionX() + 400, visibleSize.height/2 - 300); bezier.endPosition = ccp(m_fish->getPositionX() + 600,visibleSize.height/2); bezier1.controlPoint_1 = ccp(m_fish->getPositionX() + 800, visibleSize.height/2 + 300); bezier1.controlPoint_2 = ccp(m_fish->getPositionX() + 1000, visibleSize.height/2 - 300); bezier1.endPosition = ccp(m_fish->getPositionX() + 1200,visibleSize.height/2); bezierForward = CCBezierTo::create(6, bezier); nextBezier = CCBezierTo::create (6,bezier1); m_fish->runAction(CCSequence::create( bezierForward, nextBezier, NULL)); How can I make my sprite rotate while moving it with CCBezierTo?

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