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1	Game Development / Newbie & Debugging Questions / Re: Tween functions?	on: 2013-05-16 22:27:48
Thank You!

2	Game Development / Newbie & Debugging Questions / Re: Tween functions?	on: 2013-05-16 16:52:30
OK. I will try to use Universal Tween Engine. I tried that before. But I was not happy of that engine. No great tutorials etc. Now... after many hours trying.. it's ok.

3	Game Development / Newbie & Debugging Questions / Re: Tween functions?	on: 2013-05-16 15:10:49
I always look at the license. I'm searching for codes that are written and all can use it in the game. I do not know how to say this. E.g. when somebody wants to make a website, he looks for written Layouts. And of course to the license. And then the programmer downloads or copy & pastes that layout in the file. And that's, what I'm searching for. Written tweens. (Why reinvent the wheel)

4	Game Development / Newbie & Debugging Questions / Re: Tween functions?	on: 2013-05-16 13:12:00
@Danny02 Yes, that's correct but I wanted to speed up my programming. I mean, copy & paste and use the function. Of course I can look at the code. But this takes time.

5	Game Development / Newbie & Debugging Questions / Re: Tween functions?	on: 2013-05-16 11:36:37
Yes, I know that. But I'm searching only for the algorithm or functions.

6	Game Development / Newbie & Debugging Questions / Re: Tween functions?	on: 2013-05-16 10:21:54
LibGDX

7	Game Development / Newbie & Debugging Questions / Tween functions?	on: 2013-05-16 09:28:36
Hi, I want to make tween animations in a game. E.g. when the player gets a coin, I want to show on the position of the coin the score and then the score is moving up and is going transparent. (Floating score) I know, there are tween libraries. But I'm searching only for the algorithm. Not only for the floating score. All the functions the are useful for games. Another example: The text "Game over" is coming from up to the center of the screen and waiting for 3 seconds and then is moving to the bottom screen. I can make tween animations myself. But it takes time.

8	Game Development / Newbie & Debugging Questions / Re: LibGDX - StillModel mesh - dispose?	on: 2013-05-15 16:24:29
Thank you! That helped me.

Game Development / Newbie & Debugging Questions / LibGDX - StillModel mesh - dispose?

on: 2013-05-14 09:05:55

Hi,

I have 16 Levels. In each level, I have a different 3d environment (mountains, buildings, volcano etc.).

Now When I go to Level 2, I don't need anymore the environment of Level 1.

How can I now free the memory of this meshes?
For example:

1 2	StillModel mountain; StillModel buildings;

10	Game Development / Newbie & Debugging Questions / Re: LibGDX - Gradient looks weird?	on: 2013-04-27 08:45:56
Thanks!

11	Game Development / Newbie & Debugging Questions / Re: LibGDX - Gradient looks weird?	on: 2013-04-26 08:09:52
Yes. I added the RGBA8888 to the texture. Not working.

Game Development / Newbie & Debugging Questions / LibGDX - Gradient looks weird?

on: 2013-04-25 17:55:03

Hi,

I added a 3D cube. On this 3D cube is a gradient texture. When I start my app,
the gradient looks like this here:

(second image)
http://stackoverflow.com/questions/13478116/android-gradient-weirdness

I added this code to my main activity. Code is not working!

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        AndroidApplicationConfiguration cfg = new AndroidApplicationConfiguration();
        cfg.useGL20 = false;

        cfg.r = 8;
        cfg.g = 8;
        cfg.b = 8;
        cfg.a = 8;

        initialize(new Game(), cfg);

Game Development / Newbie & Debugging Questions / Re: Time based movement / deltaTime / Event Timing ?

on: 2013-04-13 13:16:55

I solved it now. Thanks to everybody.

This two lines solved my problem:

1 2	float addDelta = 100*Gdx.graphics.getDeltaTime(); speed = addDelta;

I tried that before. But without success.

Now it's working. It's unbelievable.

Game Development / Newbie & Debugging Questions / Re: Time based movement / deltaTime / Event Timing ?

on: 2013-04-12 16:32:07

Here is an example.

In my app, there is a red box. It's moving from left to right. The app starts, when you touch the screen.
Now, I installed this on my big and small smartphone. I touch the both devices at the same time.
And now I see, that the red box on my smaller smartphone touches the right side of the screen first.

In my app, there is a ease function from Robert Penner and I added Aspect ratio.

So, first the images:
(This is my libgdx.png file)

(this is, where the red box starts)

(and this is, where the red box touches the right side)

And this is the code:

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package com.me.mygdxgame;

import com.badlogic.gdx.ApplicationListener;
import com.badlogic.gdx.Gdx;
import com.badlogic.gdx.graphics.Camera;
import com.badlogic.gdx.graphics.GL10;
import com.badlogic.gdx.graphics.OrthographicCamera;
import com.badlogic.gdx.graphics.Texture;
import com.badlogic.gdx.graphics.Texture.TextureFilter;
import com.badlogic.gdx.graphics.g2d.Sprite;
import com.badlogic.gdx.graphics.g2d.SpriteBatch;
import com.badlogic.gdx.graphics.g2d.TextureRegion;
import com.badlogic.gdx.math.Rectangle;
import com.badlogic.gdx.math.Vector2;

public class MyGdxGame implements ApplicationListener {
   
    private static final int VIRTUAL_WIDTH = 800;
    private static final int VIRTUAL_HEIGHT = 480;
    private static final float ASPECT_RATIO = (float)VIRTUAL_WIDTH/(float)VIRTUAL_HEIGHT;
   
    private Rectangle viewport;
   
   private OrthographicCamera camera;
   private SpriteBatch batch;
   private Texture texture;
   private Sprite sprite;
   
   private float x = 0f;
   private float y = 0f;   
   
   private boolean start = false;
   
    private float diff = 200f;

    private float minTime = 0;
    private float maxTime = 770f;
    
    private float iEaseOut = 0;
    private float zTime = 0;
       
   @Override
   public void create() {      

      camera = new OrthographicCamera(VIRTUAL_WIDTH, VIRTUAL_HEIGHT);
      batch = new SpriteBatch();
      
      texture = new Texture(Gdx.files.internal("data/libgdx.png"));
      texture.setFilter(TextureFilter.Linear, TextureFilter.Linear);
      
      TextureRegion region = new TextureRegion(texture, 2, 2, 32, 32);
      
      sprite = new Sprite(region);
   }

   @Override
   public void dispose() {
      batch.dispose();
      texture.dispose();
   }

   @Override
   public void render() {      
      
      float deltaTime = Gdx.graphics.getDeltaTime();
      
      if (Gdx.input.isTouched()) {
         start = true;
      }      
      
      if (start) {

         if (iEaseOut < diff) {
            zTime = expoEaseOut(iEaseOut, minTime, maxTime, diff);

            float deltaAdd = zTime*deltaTime;            
            zTime += deltaAdd;               
            
            x = zTime;         

            iEaseOut++;      
         } else {
            start = false;
         }
         
      }
      
      System.out.println(Gdx.graphics.getDeltaTime());
      
      
      Gdx.gl.glClearColor(1, 1, 1, 1);
      Gdx.gl.glClear(GL10.GL_COLOR_BUFFER_BIT);
      
      camera.update();
      
        Gdx.gl.glViewport((int) viewport.x, (int) viewport.y, (int) viewport.width, (int) viewport.height);   
      
      batch.setProjectionMatrix(camera.combined);
      batch.begin();
      sprite.setPosition(x-VIRTUAL_WIDTH/2, y);
      sprite.draw(batch);
      batch.end();
   }
      
   public static float expoEaseOut(float t,float b , float c, float d) {
      return (t==d) ? b+c : c * (-(float)Math.pow(2, -10 * t/d) + 1) + b;   
   }

   @Override
   public void resize(int width, int height) {
       // calculate new viewport
        float aspectRatio = (float)width/(float)height;
        float scale = 1f;
        Vector2 crop = new Vector2(0f, 0f);
        
        if(aspectRatio > ASPECT_RATIO)
        {
            scale = (float)height/(float)VIRTUAL_HEIGHT;
            crop.x = (width - VIRTUAL_WIDTH*scale)/2f;
        }
        else if(aspectRatio < ASPECT_RATIO)
        {
            scale = (float)width/(float)VIRTUAL_WIDTH;
            crop.y = (height - VIRTUAL_HEIGHT*scale)/2f;
        }
        else
        {
            scale = (float)width/(float)VIRTUAL_WIDTH;
        }

        float w = (float)VIRTUAL_WIDTH*scale;
        float h = (float)VIRTUAL_HEIGHT*scale;
        viewport = new Rectangle(crop.x, crop.y, w, h);
   }

   @Override
   public void pause() {
   }

   @Override
   public void resume() {
   }
}

15	Game Development / Newbie & Debugging Questions / Re: Time based movement / deltaTime / Event Timing ?	on: 2013-04-12 15:27:32
I'm not calculating deltaTime. I generated a standard LibGDX Project. I get it from LibDX. When I output deltatime on my bigger smartphone I get this: 0.016456..., or 0.152546... etc. On my smaller smartphone I get this: 0.011254..., or 0.102546... etc.

Game Development / Newbie & Debugging Questions / Time based movement / deltaTime / Event Timing ?

on: 2013-04-12 09:14:39

Hi,

I'm really confused. The app is faster or slower on some devices. I had some small problems with libgdx. BUT this is the biggest problem that I've had.

First I thought I understood deltaTime. But that is not so.

Why is that so hard. I made a small program, where is a 3d cube is moving from left to right.
And then the 3d cube is moving backwards.

I've tried so many things. NOTHING WORKS.
I also added the deltaTime (test += steps*deltaTime) to the movement. Nothing helps. On my smaller smartphone the movement is faster.

I don't know what to do. On my bigger smartphone is it slower.

I have read all of this. (some things I did not understand):
http://gafferongames.com/game-physics/fix-your-timestep/

http://www.badlogicgames.com/forum/viewtopic.php?f=11&t=1845&p=10046&hilit=step+deltatime#p10046

http://www.badlogicgames.com/forum/viewtopic.php?f=11&t=4185&p=20139&hilit=deltaTime#p20139

Has somebody not a great solution for this. How can I do it, that the render() renders at the same speed on all devices?

I read about accumulate or something like that. Is this the answer?

Info: I'm not using box2d.

Has anybody solved this problem. It would be great, when somebody can post a working example code.

My program looks a little bit like this:

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public class ObjectScreen implements Screen {
   Game game;


   public ObjectScreen (Game game) {
      this.game = game;
      
      cam = new PerspectiveCamera(45, VIRTUAL_WIDTH, VIRTUAL_HEIGHT);
      ...
   }
...

@Override
public void render (float delta) {
   update(delta);
   draw(delta);
}

public void update (float deltaTime) {
   // ...
}

public void draw (float deltaTime) {      

   GL10 gl = Gdx.graphics.getGL10();

   gl.glClearColor(0.0f, 0.0f, 0.0f, 1);

   gl.glClear(GL10.GL_COLOR_BUFFER_BIT | GL10.GL_DEPTH_BUFFER_BIT);
   ...
   
   // 3d Object moving
   ...
}
}

Thank You!

17	Game Development / Newbie & Debugging Questions / Re: LibGDX - deltatime?	on: 2013-04-07 10:46:02
I understand deltaTime now better. Thanks.

Game Development / Newbie & Debugging Questions / Re: LibGDX - deltatime?

on: 2013-04-06 20:45:05

Yes, I know this, but is it not possible to do this without to add the deltaTime to the movemet variable?

My project looks like this:

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public class ObjectScreen implements Screen {
   Game game;


   public ObjectScreen (Game game) {
      this.game = game;
      
      cam = new PerspectiveCamera(45, VIRTUAL_WIDTH, VIRTUAL_HEIGHT);
      ...
   }
...

@Override
public void render (float delta) {
   update(delta);
   draw(delta);
}

public void update (float deltaTime) {
   // ...
}

public void draw (float deltaTime) {      
   if (deltaTime > 0.1f) deltaTime = 0.1f;

   GL10 gl = Gdx.graphics.getGL10();

   gl.glClearColor(0.0f, 0.0f, 0.0f, 1);

   gl.glClear(GL10.GL_COLOR_BUFFER_BIT | GL10.GL_DEPTH_BUFFER_BIT);
   ...
   
   // 3d Object moving
   ...
}
}

19	Game Development / Newbie & Debugging Questions / Re: Opengl - Light looks different?	on: 2013-04-06 20:29:55
Oh... OK. I also first thought the same but then I thought, maybe I programmed it wrong.

Game Development / Newbie & Debugging Questions / LibGDX - deltatime?

on: 2013-04-06 20:28:27

3d Object moving on my second phone is faster.

I tried this here:

1	if (deltaTime > 0.1f) deltaTime = 0.1f;

But this don't works.

How can I do it, that the render() has the same speed on all phones?

I thought, that LibGDX regulates the deltatime self.

Game Development / Newbie & Debugging Questions / Opengl - Light looks different?

on: 2013-04-06 15:31:06

Hi,

I'm programming with LibGDX.

I added this code:

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       float lightColor1[] = {1.0f, 1.0f, 1.0f, 1.0f}; //Color (0.5, 0.2, 0.2)
       float lightPos1[] = {-1.0f, 0.5f, 0.5f, 0.0f};
       gl.glLightfv(GL10.GL_LIGHT1, GL10.GL_DIFFUSE, lightColor1, 0);
       gl.glLightfv(GL10.GL_LIGHT1, GL10.GL_POSITION, lightPos1, 0);

I have two different smartphones. The Light looks different on this two smartphones. I don't know why?

On the first smartphone the light is weak and on the second smartphone the light is bright.

EDIT:

OK. Now I programmed this:

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      // Create light components
      float ambientLight[] = { 1f, 1f, 1f, 1.0f };
      float diffuseLight[] = { 1f, 1f, 1f, 1.0f };
      float specularLight[] = { 1f, 1f, 1f, 1.0f };
      float position[] = { 0f,0f, 5.0f, 1.0f };

      // Assign created components to GL_LIGHT0
      gl.glLightfv(GL10.GL_LIGHT0, GL10.GL_AMBIENT, ambientLight, 0);
      gl.glLightfv(GL10.GL_LIGHT0, GL10.GL_DIFFUSE, diffuseLight, 0);
      gl.glLightfv(GL10.GL_LIGHT0, GL10.GL_SPECULAR, specularLight, 0);
      gl.glLightfv(GL10.GL_LIGHT0, GL10.GL_POSITION, position, 0);

It's now a little bit better, but on the small smartphone the texture looks brighter.

Game Development / Newbie & Debugging Questions / Re: LibGDX - Camera Coordinate To Screen Coordinate?

on: 2013-03-29 14:49:58

I added the perspective camera like this:

1	camera = new PerspectiveCamera(67, VIRTUAL_WIDTH, VIRTUAL_HEIGHT);

gluPerspective is the same, right?

OK. I try to explain. e.g.

The sprite is moving from left to right. When I now

1	System.out.println(sprite.x+" \| "+sprite.y)

I get this e.g. x:50, y:100 or x:55, y100 or x:500, y:100 etc.
The (0,0) is left bottom!

Now I don't know how move the 3d object at this positions? This is not working:

1	Gdx.gl10.glTranslatef(sprite.x, srite.y, -35.0f);

For e.g. When I do this,

1	Gdx.gl10.glTranslatef(100f, 0.0f, -35.0f);

I don't see the 3d object on the screen:

Game Development / Newbie & Debugging Questions / LibGDX - Camera Coordinate To Screen Coordinate?

on: 2013-03-29 13:52:24

Hi,

I made a sprite, that is moving on the screen. The sprite moves from left screen to the right screen.

Now, I will hide the sprite and I will add a 3d Object on the sprites position.

The problem is now: The width and height of the screen is 800x480.

And now I don't know how to move the 3d object? e.g.

1	Gdx.gl10.glTranslatef(sprite.x, srite.y, -35.0f);

Must I now cam.project or cam.unproject this? Or what is the right keyword?

Game Development / Newbie & Debugging Questions / Re: LibGDX - Get TouchPoint X and Y in Perspective?

on: 2013-03-27 19:25:25

Hi,

I solved it now so:

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float X = MathUtils.round(Gdx.input.getX()*(480f/1196f));

float Y = MathUtils.round(Gdx.input.getY()*(320f/720f));

If there is a better solution, then please post it.

Game Development / Newbie & Debugging Questions / LibGDX - Get TouchPoint X and Y in Perspective?

on: 2013-03-27 17:22:52

Hi,

I add a perspective camera.

1	cam = new PerspectiveCamera(45, 480, 320);

When I try to get the touchpoints with

1	(Gdx.input.getX(), Gdx.input.getY())

I get wrong numbers. My Perspective width is 480.

When I touch with my finger the screen (rightmost), I get 1196.

This is my screen resolution of my device.

EDIT: I also get wrong numbers when I try:

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      private Vector3 touchPoint;

       cam.unproject(touchPoint.set(Gdx.input.getX(), Gdx.input.getY(), 0));

       System.out.println(touchPoint.x+" | "+touchPoint.y);

I get something like this with touchpoint.x: -6 to 0.75

26	Game Development / Newbie & Debugging Questions / Re: LibGDX - How change the standard LibGX Project to Perspective Camera?	on: 2013-03-27 15:35:48
I solved it with the help of ProjectTest.java It's an example in GDX Tests.

Game Development / Newbie & Debugging Questions / LibGDX - How change the standard LibGX Project to Perspective Camera?

on: 2013-03-27 12:01:40

Hi,

I generated the simple LibGDX project where you see a LibGDX image.

The example is made with

1	private OrthographicCamera camera;

How can I change this to Perpective Camera?

I want it in Perspective Camera with the same look like in Orthographic Camera.

I will add some 3d objects on this image. Like this:

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         StillModel mesh;

    ... create()

          mesh =  ModelLoaderRegistry.loadStillModel(Gdx.files.internal("data/testObject.obj"));

    ... render()

          gl.glClear(GL10.GL_COLOR_BUFFER_BIT | GL10.GL_DEPTH_BUFFER_BIT);

          camera.update();

          batch.setProjectionMatrix(camera.combined);
          batch.begin();
          sprite.draw(batch);
          batch.end();

          gl.glEnable(GL10.GL_DEPTH_TEST);
          gl.glEnable(GL10.GL_LIGHTING);
          gl.glEnable(GL10.GL_COLOR_MATERIAL);
          gl.glEnable(GL10.GL_TEXTURE_2D);

          camera.update();
          gl.glMatrixMode(GL10.GL_PROJECTION);
          gl.glLoadIdentity();

          gl.glLoadMatrixf(cam.projection.val, 0);
          gl.glMatrixMode(GL10.GL_MODELVIEW);
          gl.glLoadMatrixf(cam.view.val, 0);

          gl.glEnable(GL10.GL_LIGHT0);
          gl.glLightfv(GL10.GL_LIGHT0, GL10.GL_DIFFUSE, lightColor, 0);
          gl.glLightfv(GL10.GL_LIGHT0, GL10.GL_POSITION, lightPosition, 0);

          gl.glRotatef(angleY, 0, 1, 0);
          gl.glRotatef(angleX, 1, 0, 0);
          mesh.render();
    ...

Has someone an Idea?

28	Discussions / General Discussions / Re: In-App Purchase	on: 2013-03-23 17:44:57
Wow! Thanks! About the game. I only made one level and the train movements. Before I write the whole game I wanted to inform me what I can do. I played Subway Surfers. Is well done. Now I will take a pencil and a sheet of paper and make a game concept.

29	Discussions / General Discussions / Re: In-App Purchase	on: 2013-03-23 16:20:39
Hi. Ok. I played Subway Surfers. They don't only sell "Double Coins". There are more things you can buy.

30	Discussions / General Discussions / Re: In-App Purchase	on: 2013-03-23 15:00:08
Thanks. Good examples and helpful tips.

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