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• Video playback in games - formats & decoding

  - by snake5

  What free / non-restrictive open-source solutions (not GPL) are available for decoding game videos? The requirements are simple: a relatively easy to use C API encoded files must be quite small there must be an application that converts videos from any format (whatever codec is installed on Windows or equivalent amount of internally decoded formats) decoding has to happen fairly quickly bonus points go to file formats that are popular / actively supported and developed

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• What's a good way to check that a player has clicked on an object in a 3D game?

  - by imja

  I'm programming a 3D game (using C++ and OpenGL), and I have a few 3D objects in the scene, we can say they are boxes for this example. I want to let the player click on those boxes to select them (ie. they might change color) with the typical restriction like if more than one box is located where the user clicked, only the one closest to the camera would get selected. What would be the best way to do this? The fact that these objects go through several transforms before getting to window coordinates is what makes this a bit tricky. One approach I thought about was that if the player clicks on the screen, I could normalize the x,y coordinates of mouse click and then transform the bounding box coordinates of the objects into clip-space so that I could compare then to the normalized mouse coordinates. I guess I could then do some sort of ray-box collision test to see if any objects lie as the path of the mouse click. I'm afraid I might be over complicating it. Any better methods out there?

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• My Sprite comes out the screen

  - by IlNero

  If i an action moves the sprite,how can i keep the CCSprite on the screen???? this is my code: [enemy runAction:[CCSequence actions:[CCMoveBy actionWithDuration:2.0 position:ccp(-winSize.width*0.4, 0)], [CCMoveBy actionWithDuration:randomValueBetween(1.0, 0.3) position:ccp(randomValueBetween(winSize.width*0.2, -winSize.width*0.2), randomValueBetween(winSize.height*0.2, -winSize.height*0.2))], [CCDelayTime actionWithDuration:0.5], [CCMoveBy actionWithDuration:randomValueBetween(1.0, 0.3) position:ccp(randomValueBetween(winSize.width*0.2, -winSize.width*0.2), randomValueBetween(winSize.height*0.2, -winSize.height*0.2))], [CCDelayTime actionWithDuration:0.5], [CCMoveBy actionWithDuration:randomValueBetween(1.0, 0.3) position:ccp(randomValueBetween(winSize.width*0.2, -winSize.width*0.2), randomValueBetween(winSize.height*0.2, -winSize.height*0.2))], [CCDelayTime actionWithDuration:0.5], [CCMoveBy actionWithDuration:randomValueBetween(1.0, 0.3) position:ccp(randomValueBetween(winSize.width*0.2, -winSize.width*0.2), randomValueBetween(winSize.height*0.2, -winSize.height*0.2))], [CCDelayTime actionWithDuration:0.5], [CCMoveBy actionWithDuration:randomValueBetween(1.0, 0.3) position:ccp(randomValueBetween(winSize.width*0.2, -winSize.width*0.2), randomValueBetween(winSize.height*0.2, -winSize.height*0.2))], [CCDelayTime actionWithDuration:0.5], [CCMoveBy actionWithDuration:randomValueBetween(1.0, 0.3) position:ccp(randomValueBetween(-winSize.width*0.3,winSize.width*0.3), randomValueBetween(winSize.height*0.3, -winSize.height*0.3))], [CCDelayTime actionWithDuration:0.5], [CCMoveBy actionWithDuration:randomValueBetween(1.0, 0.3) position:ccp(randomValueBetween(-winSize.width*0.2,winSize.width*0.2), randomValueBetween(winSize.height*0.2, -winSize.height*0.2))], [CCDelayTime actionWithDuration:0.5], [CCMoveBy actionWithDuration:randomValueBetween(1.0, 0.3) position:ccp(randomValueBetween(-winSize.width*0.3,winSize.width*0.3), randomValueBetween(winSize.height*0.3, -winSize.height*0.3))], [CCDelayTime actionWithDuration:0.5], [CCMoveBy actionWithDuration:randomValueBetween(1.0, 0.3) position:ccp(randomValueBetween(-winSize.width*0.2,winSize.width*0.2), randomValueBetween(winSize.height*0.2, -winSize.height*0.2))], [CCDelayTime actionWithDuration:0.5], [CCMoveBy actionWithDuration:randomValueBetween(1.0, 0.3) position:ccp(randomValueBetween(-winSize.width*0.3,winSize.width*0.3), randomValueBetween(winSize.height*0.3, -winSize.height*0.3))], [CCDelayTime actionWithDuration:0.5], [CCMoveBy actionWithDuration:randomValueBetween(1.0, 0.3) position:ccp(randomValueBetween(-winSize.width*0.2,winSize.width*0.2), randomValueBetween(winSize.height*0.2, -winSize.height*0.2))], [CCDelayTime actionWithDuration:0.5], [CCMoveBy actionWithDuration:2.0 position:ccp(-winSize.width*1.5, 0)], [CCCallFuncN actionWithTarget:self selector:@selector(invisNode:)], nil]]; but whit this code the sprite sometimes comes out the screen, i need the sprite moves randomly in the screen without comes out..

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• Can minecraft support an asymmetrical mesh?

  - by Qwaar

  So in a bout of fancy I have decided I want to play as a Zaku II from gundam, and was saddened that player skins must be symmetrical. Then I remembered my friends mod that let him play as a MLP pony, and another one that let you shapeshift into mobs. So I decided I could just butcher a player model mesh and slap on the shoulder spike and shield, slap a Zaku skin I found on it, port the colors over onto more texture for the shoulder portions, and call it a day once I added it to the shiftable list, before butchering a gun mod to turn a gun into a ZMP-78. Before I get started on this though, I need to know if minecraft will support an asymmetrical mesh.

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• Where can I find good (well organized) examples of game code?

  - by smasher

  Where can I find good (well organized) examples of game code? I'm hoping that I can pick up some organizational tips. Most examples in books are too short and leave out lots of detail for the sake of brevity. I'm particularly interested on how to group your variables and methods so that another programmer would know where to look in the code. For example initializers at the top, then methods that take input, then methods that update views. I don't care about a particular language, as long as its OOP. I looked at the Quake 2 and 3 sources, but they're straight C and not much help for getting tips on organizing your objects. So, have you seen some good source? Any pointers to code that makes you say "wow, that's well organized" would be great.

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• Java ResourceLoader.getResourceAsStream local resource

  - by Dajgoro Labinac

  Before using lwjgl, i used the Graphic method, and there i displayed imageicons, and i had the picture file located in the resources. I used: ImageIcon tcard = new ImageIcon(this.getClass().getResource("RCA.png")); to load the image. Now when i load textures in lwjgl, i have to use absolute paths to locate the file: tcard = TextureLoader.getTexture("PNG", ResourceLoader.getResourceAsStream("C:/RCA.png")); I tried googling, but i didn't find anything helpful... How can i load the image from the local resources like in the first example?

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• Game Asset Storage: Archive vs Individual files

  - by David Colson

  As I am in the process of creating a 3D c++ game and I was wondering what would be more beneficial when dealing with game assets with regards to storage. I have seen some games have a single asset file compressed with everything in it and other with lots of little compressed files. If I had lots of individual files I would not need to load a large file at once and use up memory but the code would have to go about file seeking when the level loads to find all the correct files needed. There is no file seeking needed when dealing with one large file, but again, what about all the assets not currently needed that would get loaded with the one file? I could also have an asset file for each level, but then how do I deal with shared assets This has been bothering me for a while so tell me what other advantages and disadvantages are there to either way of doing things.

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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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• How can I read from multiple textures in an OpenGL ES 2 shader?

  - by Peyman Tahghighi

  How can I enable more than one texture in OpenGL ES 2 so that I can sample from all of them in my shader? For example, I'm trying to read from two different textures in my shader for the player's car. This is how I'm currently dealing with the texture for my car: glActiveTexture(GL_TEXTURE0); glBindTexture(GL_TEXTURE_2D, this->texture2DObj); glUniform1i(1, 0); glBindBuffer(GL_ARRAY_BUFFER, this->vertexBuffer); glEnableVertexAttribArray(0); int offset = 0; glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, this->vertexBufferSize,(const void *)offset); offset += 3 * sizeof(GLfloat); glEnableVertexAttribArray(1); glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, this->vertexBufferSize, (const void*)offset); glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, this->indexBuffer); glDrawElements(GL_TRIANGLES, this->indexBufferSize, GL_UNSIGNED_SHORT, 0); glDisableVertexAttribArray(0); glDisableVertexAttribArray(1);

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• Make a basic running sprite effect

  - by PhaDaPhunk

  I'm building my very first game with XNA and i'm trying to get my sprite to run. Everything is working fine for the first sprite. E.g : if I go right(D) my sprite is looking right , if I go left(A) my sprite is looking left and if I don't touch anything my sprite is the default one. Now what I want to do is if the sprite goes Right, i want to alternatively change sprites (left leg, right leg, left leg etc..) xCurrent is the current sprite drawn xRunRight is the first running Sprite and xRunRight1 is the one that have to exchange with xRunRight while running right. This is what I have now : protected override void Update(GameTime gameTime) { float timer = 0f; float interval = 50f; bool frame1 = false ; bool frame2 = false; bool running = false; KeyboardState FaKeyboard = Keyboard.GetState(); // Allows the game to exit if (GamePad.GetState(PlayerIndex.One).Buttons.Back == ButtonState.Pressed) this.Exit(); if ((FaKeyboard.IsKeyUp(Keys.A)) || (FaKeyboard.IsKeyUp(Keys.D))) { xCurrent = xDefault; } if (FaKeyboard.IsKeyDown(Keys.D)) { timer += (float)gameTime.ElapsedGameTime.TotalMilliseconds; if (timer > interval) { if (frame1) { xCurrent = xRunRight; frame1 = false; } else { xCurrent = xRunRight1; frame1 = true; } } xPosition += xDeplacement; } Any ideas...? I've been stuck on this for a while.. Thanks in advance and let me know if you need any other part from the code.

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• I need advice on creating animal 3D walk cycles in XNA

  - by Zetar

  I want to purchase a number of 3D models from TurboSquid and animate them in an XNA game. I wrote a lot of games from 1985-1999 and have recently become involved with XNA. Now I would like to port one of my old games to the XBOX. I do have a background in 3D animation; but that was years ago. What is the current method for animating a walk cycle with a 3D model and using it inside XNA? Is there a book, software or a tutorial that you can recommend? Thanks in advance and sorry for such a broad and currently naive question.

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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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• Why am I seeing streak artifacts on the cube map I'm rendering?

  - by BobDole

  I'm getting strange streaks on my cube map when rendering to it. He is my code that is being called each frame: void drawCubeMap(void) { int face; glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); glBindFramebuffer(GL_FRAMEBUFFER, fbo); //glBindTexture(GL_TEXTURE_CUBE_MAP, cubeMapTexture); //glClearColor(1.0f, 1.0f, 1.0f, 1.0f); glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); glViewport(0,0,sizeT, sizeT); for (face = 0; face < 6; face++) { glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0,GL_TEXTURE_CUBE_MAP_POSITIVE_X + face, cubeMapTexture, 0); drawSpheres(); } glBindFramebuffer(GL_FRAMEBUFFER, 0); glBindTexture(GL_TEXTURE_2D, 0); glViewport(0,0,900, 900); } Any idea what it might be? The streaking occurs when I'm rotating the spheres around the main sphere.

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• Help with timebased scoring algorithm

  - by Dave

  Im trying to devise an appropriate scoring system for my game. The game in essense has a finite number of tasks to complete (say 20) and the quicker you complete these task, the more points you get. I had devised a basic way of doing this using bands of time multiplied by a score for that band multiplied by the number of tasks solved within that time band i.e. (Time Band) = (Points) 1-5 sec = 15, 5-10 secs = 10, 10-20 secs = 5, 20-30 secs = 3, 40 secs onwards = 1, So for example if I did 3 tasks in the 1-5sec band i'd get 15*3=45points, if i found 10 in the 20-30sec band i'd get 3*10=30 points. Im sure there is a more mathematical way of doing this using powers of some kind but I just can't think how and hoping someone has already done something smilar.. Many thanks in advance

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• Cocos-2D asteroids style movement (iOS)

  - by bwheeler96

  So I have a CCSprite subclass, well call this Spaceship. Spaceship needs to move on a loop, until I say othersise by calling a method. The method should look something like - (void)moveForeverAtVelocity { // method logic } The class Spaceship has two relevant iVars, resetPosition and targetPosition, the target is where we are headed, the reset is where we set to when we've hit our target. If they are both off-screen this creates a permanent looping effect. So for the logic, I have tried several things, such as CCMoveTo *move = [CCMoveTo actionWithDuration:2 position:ccp(100, 100)]; CCCallBlockN *repeat = [CCCallBlockN actionWithBlock: ^(CCNode *node) { [self moveForeverAtVelocity]; }]; [self runAction:[CCSequence actions: move, repeat, nil]]; self.position = self.resetPosition; recursively calling the moveForeverAtVelocity method. This is psuedo-code, so its not perfect. I have hard-coded some of the values for the sake of simplicity. Enough garble: The problem I am having, how can I make a method that loops forever, but can be called and reset at will. I'm running into issues with creating multiple instances of this method. If you can offer any assistance with creating this effect, that would be appreciated.

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• I enabled and setup glBlendFunc, but my texture has a white outline. What am I doing wrong?

  - by vinzBad

  You can see most of my source code in this question: Instead of the specified Texture, black circles on a green background are getting rendered. Why? Now I have the problem, that my texture has a white outline on its transparent parts. After googling and setting up glBlendFunc, the outline just got "softer". This is how it looks like: This is how I now setup OpenGL: public static void SetupGL() { GL.Enable(EnableCap.Blend); GL.BlendFunc(BlendingFactorSrc.SrcAlpha, BlendingFactorDest.OneMinusSrcAlpha); GL.Enable(EnableCap.Texture2D); GL.Hint(HintTarget.PerspectiveCorrectionHint, HintMode.Nicest); }

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• What's wrong with this OpenGL model picking code?

  - by openglNewbie

  I am making simple model viewer using OpenGL. When I want to pick an object OpenGL returns nothing or an object that is in another place. This is my code: GLuint buff[1024] = {0}; GLint hits,view[4]; glSelectBuffer(1024,buff); glGetIntegerv(GL_VIEWPORT, view); glMatrixMode(GL_PROJECTION); glPushMatrix(); glLoadIdentity(); gluPickMatrix(x,y,1.0,1.0,view); gluPerspective(45,(float)view[2]/(float)view[4],1.0,1500.0); glMatrixMode(GL_MODELVIEW); glRenderMode(GL_SELECT); glLoadIdentity(); //I make the same transformations for normal render glTranslatef(0, 0, -zoom); glMultMatrixf(transform.M); glInitNames(); glPushName(-1); for(int j=0;j<allNodes.size();j++) { glLoadName(allNodes.at(j)->id); allNodes.at(j)->Draw(textures); } glPopName(); glMatrixMode(GL_PROJECTION); glPopMatrix(); hits = glRenderMode(GL_RENDER);

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• How to pass an interface to Java from Unity code?

  - by nickbadal

  First, let me say that this is my first experience with Unity, so the answer may be right under my nose. I've also posted this question on Unity's answers site, but plugin questions don't seem to be as frequently answered there. I'm trying to create a plugin that allows me to access an SDK from my game. I can call SDK methods just fine using AndroidJavaObject and I can pass data to them with no issue. But there are some SDK methods that require an interface to be passed. For example, my Java function: public void attemptLogin(String username, String password, LoginListener listener); Where listener; is a callback interface. I would normally run this code from Java as such: attemptLogin("username", "password", new LoginListener() { @Override public void onSuccess() { //Yay! do some stuff in the game } @Override public void onFailure(int error) { //Uh oh, find out what happened based on error } }); Is there a way to pass a C# interface through JNI/Unity to my attemptLogin function? Or is there a way to create a mimic-ing interface in C# that I can call from inside the Java code (and pass in any kind of parameter)? Thanks in advance! :)

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• Determining the angle to fire a shot when target and shooter moves, and bullet moves with shooter velocity added in

  - by Azaral

  I saw this question: Predicting enemy position in order to have an object lead its target and followed the link in the answer to stack overflow. In the stack overflow page I used the 2nd answer, the one that is a large mathematical derivation. My situation is a little different though. My first question though is will the answer provided in the stack overflow page even work to begin with, assuming the original circumstances of moving target and stationary shooter. My situation is a little different than that situation. My target moves, the shooter moves, and the bullets from the shooter start off with the velocities in x and y added to the bullets' x and y velocities. If you are sliding to the right, the bullets will remain in front of you as you move so as long as your velocity remains constant. What I'm trying to do is to get the enemy to be able to determine where they need to shoot in order to hit the player. Unless the player and enemy is stationary, the velocity from the ship adding to the velocity of the bullets will cause a miss. I'd rather like to prevent that. I used the formula in the stack overflow answer and did what I thought were the appropriate adjustments. I've been banging at this for the last four hours and I just can't make it click. It is probably something really simple and boneheaded that I am missing (that seems to be a lot of my problems lately). Here is the solution presented from the stack overflow answer: It boils down to solving a quadratic equation of the form: a * sqr(x) + b * x + c == 0 Note that by sqr I mean square, as opposed to square root. Use the following values: a := sqr(target.velocityX) + sqr(target.velocityY) - sqr(projectile_speed) b := 2 * (target.velocityX * (target.startX - cannon.X) + target.velocityY * (target.startY - cannon.Y)) c := sqr(target.startX - cannon.X) + sqr(target.startY - cannon.Y) Now we can look at the discriminant to determine if we have a possible solution. disc := sqr(b) - 4 * a * c If the discriminant is less than 0, forget about hitting your target -- your projectile can never get there in time. Otherwise, look at two candidate solutions: t1 := (-b + sqrt(disc)) / (2 * a) t2 := (-b - sqrt(disc)) / (2 * a) Note that if disc == 0 then t1 and t2 are equal. If there are no other considerations such as intervening obstacles, simply choose the smaller positive value. (Negative t values would require firing backward in time to use!) Substitute the chosen t value back into the target's position equations to get the coordinates of the leading point you should be aiming at: aim.X := t * target.velocityX + target.startX aim.Y := t * target.velocityY + target.startY Here is my code, after being corrected by Sam Hocevar (thank you again for your help!). It still doesn't work. For some reason it never enters the section of code inside the if(disc = 0) (obviously because it is always less than zero but...). However, if I plug the numbers from my game log on the enemy and player positions and velocities it outputs a valid firing solution. I have looked at the code side by side a couple of times now and I can't find any differences. There has got to be something simple I'm missing here. If someone else could look at this code and determine what is going on here I'd appreciate it. I know it's not going through that section because if it were, shouldShoot would become true and the enemy would be blasting away at the player. This section calls the function in question, CalculateShootHeading() if(shouldMove) { UseEngines(); } x += xVelocity; y += yVelocity; CalculateShootHeading(); if(shouldShoot) { ShootWeapons(); } UpdateWeapons(); This is CalculateShootHeading(). This is inside the enemy class so x and y are the enemy's x and y and the same with velocity. One output from my game log gives Player X = 2108, Player Y = -180.956, Player X velocity = 10.9949, Player Y Velocity = -6.26017, Enemy X = 1988.31, Enemy Y = -339.051, Enemy X velocity = 1.81666, Enemy Y velocity = -9.67762, 0 enemy projectiles. The output from the console tester is Bullet position = 2210.49, -239.313 and Player Position = 2210.49, -239.313. This doesn't make any sense. The only thing that could be different is the code or the input into my function in the game and I've checked that and I don't think that it is wrong as it's updated before this and never changed. float const bulletSpeed = 30.f; float const dx = playerX - x; float const dy = playerY - y; float const vx = playerXVelocity - xVelocity; float const vy = playerYVelocity - yVelocity; float const a = vx * vx + vy * vy - bulletSpeed * bulletSpeed; float const b = 2.f * (vx * dx + vy * dy); float const c = dx * dx + dy * dy; float const disc = b * b - 4.f * a * c; shouldShoot = false; if (disc >= 0.f) { float t0 = (-b - std::sqrt(disc)) / (2.f * a); float t1 = (-b + std::sqrt(disc)) / (2.f * a); if (t0 < 0.f || (t1 < t0 && t1 >= 0.f)) { t0 = t1; } if (t0 >= 0.f) { float shootx = vx + dx / t0; float shooty = vy + dy / t0; heading = std::atan2(shooty, shootx) * RAD2DEGREE; } shouldShoot = true; }

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• Frame rate on one of two machines running same code seems to be capped at 60 for no reason

  - by dennmat

  ISSUE I recently moved a project from my laptop to my desktop(machine info below). On my laptop the exact same code displays the fps(and ms/f) correctly. On my desktop it does not. What I mean by this is on the laptop it will display 300 fps(for example) where on my desktop it will show only up to 60. If I add 100 objects to the game on the laptop I'll see my frame rate drop accordingly; the same test on the desktop results in no change and the frames stay at 60. It takes a lot(~300) entities before I'll see a frame drop on the desktop, then it will descend. It seems as though its "theoretical" frames would be 400 or 500 but will never actually get to that and only do 60 until there's too much to handle at 60. This 60 frame cap is coming from no where. I'm not doing any frame limiting myself. It seems like something external is limiting my loop iterations on the desktop, but for the last couple days I've been scratching my head trying to figure out how to debug this. SETUPS Desktop: Visual Studio Express 2012 Windows 7 Ultimate 64-bit Laptop: Visual Studio Express 2010 Windows 7 Ultimate 64-bit The libraries(allegro, box2d) are the same versions on both setups. CODE Main Loop: while(!abort) { frameTime = al_get_time(); if (frameTime - lastTime >= 1.0) { lastFps = fps/(frameTime - lastTime); lastTime = frameTime; avgMspf = cumMspf/fps; cumMspf = 0.0; fps = 0; } /** DRAWING/UPDATE CODE **/ fps++; cumMspf += al_get_time() - frameTime; } Note: There is no blocking code in the loop at any point. Where I'm at My understanding of al_get_time() is that it can return different resolutions depending on the system. However the resolution is never worse than seconds, and the double is represented as [seconds].[finer-resolution] and seeing as I'm only checking for a whole second al_get_time() shouldn't be responsible. My project settings and compiler options are the same. And I promise its the same code on both machines. My googling really didn't help me much, and although technically it's not that big of a deal. I'd really like to figure this out or perhaps have it explained, whichever comes first. Even just an idea of how to go about figuring out possible causes, because I'm out of ideas. Any help at all is greatly appreciated.

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• Is it possible to programmatically prevent a game from pausing when its window loses focus?

  - by user836045

  I'm playing Skyrim in windowed mode and I am trying to create a bot for this game for personal use. I would like to have the bot play the game in the background, while I do other things, the only problem is that the game window pauses when it loses focus. Is there a way to make the Skyrim process think that it still has the focus, so it continues to run while I do something else on another window? I'm not a windows programming expert but would this be possible if I could somehow intercept the message that says unfocused or minimized to the process, and thus let the process think its still focused? I think Skyrim uses directx, so is it possible to come up with a solution from that end?

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• Changing the rendering resolution while maintaining the design layout

  - by Coyote

  I would like to increase the FPS of my project. Currently I would like to try reducing the resolution at which the scenes are rendered. Let's say I never want to draw more than 1280*720. What ever the real resolution is. How should I proceed? I tried pEGLView->setFrameSize(1280, 720); but only reduces the displayed size of the frame on screen (boxing). In my activity I tried setting the size of the "surface" but this seems to completely break the layout (as defined by setDesignResolutionSize). @Override public Cocos2dxGLSurfaceView onCreateView() { Cocos2dxGLSurfaceView surfaceView = new Cocos2dxGLSurfaceView(this); surfaceView.getHolder().setFixedSize(1280, 720); return surfaceView; } Is there a way to simply change the rendered

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• 2D Topdown Shooter Mouse Movement

  - by Jarmo

  I'm trying to make a topdown 2D space game for my school project. I'm almost done but I just want to add a few little things to make the game more fun to play. if (keystate.IsKeyDown(Keys.W)) { vPlayerPos += Vector2.Normalize(new Vector2(Mouse.GetState().X - vPlayerPos.X, Mouse.GetState().Y - vPlayerPos.Y)) * 3; rPlayer.X = (int)vPlayerPos.X; rPlayer.Y = (int)vPlayerPos.Y; } if (keystate.IsKeyDown(Keys.S)) { vPlayerPos += Vector2.Normalize(new Vector2(Mouse.GetState().X - vPlayerPos.X, Mouse.GetState().Y - vPlayerPos.Y)) * -3; rPlayer.X = (int)vPlayerPos.X; rPlayer.Y = (int)vPlayerPos.Y; } This is what i use to move towards and away from my mouse crossair. I tried to make a somewhat similar function to make it strafe with "A" and "D". But for some reason I just couldn't get it done. Any thoughts?

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• rotating an object on an arc

  - by gardian06

  I am trying to get a turret to rotate on an arc, and have hit a wall. I have 8 possible starting orientations for the turrets, and want them to rotate on a 90 degree arc. I currently take the starting rotation of the turret, and then from that derive the positive, and negative boundary of the arc. because of engine restrictions (Unity) I have to do all of my tests against a value which is between [0,360], and due to numerical precision issues I can not test against specific values. I would like to write a general test without having to go in, and jury rig cases //my current test is: // member variables public float negBound; public float posBound; // found in Start() function (called immediately after construction) // eulerAngles.y is the the degree measure of the starting y rotation negBound = transform.eulerAngles.y-45; posBound = transform.eulerAngles.y+45; // insure that values are within bounds if(negBound<0){ negBound+=360; }else if(posBound>360){ posBound-=360; } // called from Update() when target not in firing line void Rotate(){ // controlls what direction if(transform.eulerAngles.y>posBound){ dir = -1; } else if(transform.eulerAngles.y < negBound){ dir = 1; } // rotate object } follows is a table of values for my different cases (please excuse my force formatting) read as base is the starting rotation of the turret, neg is the negative boundry, pos is the positive boundry, range is the acceptable range of values, and works is if it performs as expected with the current code. |base-|-neg-|-pos--|----------range-----------|-works-| |---0---|-315-|--45--|-315-0,0-45----------|----------| |--45--|---0---|--90--|-0-45,54-90----------|----x----| |-135-|---90--|-180-|-90-135,135-180---|----x----| |-180-|--135-|-225-|-135-180,180-225-|----x----| |-225-|--180-|-270-|-180-225,225-270-|----x----| |-270-|--225-|-315-|-225-270,270-315-|----------| |-315-|--270-|---0---|--270-315,315-0---|----------| I will need to do all tests from derived, or stored values, but can not figure out how to get all of my cases to work simultaneously. //I attempted to concatenate the 2 tests: if((transform.eulerAngles.y>posBound)&&(transform.eulerAngles.y < negBound)){ dir *= -1; } this caused only the first case to be successful // I attempted to store a opposite value, and do a void Rotate(){ // controlls what direction if((transform.eulerAngles.y > posBound)&&(transform.eulerAngles.y<oposite)){ dir = -1; } else if((transform.eulerAngles.y < negBound)&&(transform.eulerAngles.y>oposite)){ dir = 1; } // rotate object } this causes the opposite situation as indicated on the table. What am I missing here?

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• How to decompose a rectangular shape in a Voronoi diagram, only generating convex shapes?

  - by DevilWithin

  I think this is a very straighforward question, lets say i have a building in 2D, a rectangle shape. Now i want to decompose that area in a lot of convex shapes, as seen in a voronoi diagram, or closely like it, just so I can add those shapes to the physics engine, and have a realistic destruction. Bonus: Possible suggestions on how to make the effect more dynamic and interesting. Please keep in mind we re talking about realtime calculations..

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