Develop Reference

OSMdroid - Replace empty grid background when no tile available (offline)

I'm using OSMdroid library in my project to display map tiles (it's a shape with lines and blank background) from my company local sever in my app. The thing is when I use the app in offline mode and I browse the map shows an empty grey grid background for the tiles that aren't in the cache, and I want to change that empty grey grid for an blank background image/tile.
The only workaround that I've found to achieve this is the following:
Add a tile overlay and set setLoadingBackgroundColor and setLoadingLineColor to Color.WHITE, and then set the TileSource from the local server from OnlineTileSourceBase. I know this is not quite performant, so is there a better way to do this? Thanks in advance!
final ITileSource tileSource = new OnlineTileSourceBase(...)
{
#Override
public String getTileURLString(MapTile aTile) {
return getBaseUrl() + aTile.getX() + "+" + aTile.getY() + "+" + aTile.getZoomLevel();
}
};
tileProvider = new MapTileProviderBasic(context, tileSource);
tilesOverlay = new TilesOverlay(tileProvider , context);
tilesOverlay.setLoadingBackgroundColor(Color.WHITE);
tilesOverlay.setLoadingLineColor(Color.WHITE);
this.map.getOverlays().add(tilesOverlay);
this.map.setTileSource(tileProvider.getTileSource());
map.invalidate();

Your code is an example on adding a secondary tile overlay. That's useful for when you need another raster graphics overlay on top of the map imagery.
You can also change the loading lines and background for the existing and default tiles overlay. This should get you going
mMapView.getOverlayManager().getTilesOverlay().setLoadingBackgroundColor(Color.TRANSPARENT);
mMapView.getOverlayManager().getTilesOverlay().setLoadingLineColor(Color.TRANSPARENT);

Putting Markers inside Venue

I am currently working on the Venues3D provided by Here-api.
Here is my problem:
I want to put a Marker inside a Venue and ontop of a Space.
Here is a example picture of what I want from the official Here WeGo Android-App.
Example: Marker ontop of Space inside venue
I already checked out the "normal" MapMarkers but they only take GeoCoordinate and not Spaces inside a Venue.
The Venue3DTutorial didn't help too much either. There is a routing option shipped with it that pins the markers when calculating a route between two points inside a venue. But this is done in the background.(Also called Flags)
Is there an other Class that provides this functionality?

Each Space has a center as GeoCoordinate, so you can use it for your marker. You should also specify correct parameters, so the marker will be visible on top of the venue. Here's an example how to do it with a marker similar to the one in HERE WeGo app:
public void showMarker(Space space) {
Bitmap bitmap = BitmapFactory.decodeResource(getResources(),
R.drawable.your_marker_image);
Image image = new Image();
image.setBitmap(bitmap);
m_marker = new MapMarker(space.getCenter(), image);
// Set anchor point to the centre-bottom area of the marker
m_marker.setAnchorPoint(new PointF(image.getWidth() / 2f, image.getHeight()));
m_marker.setOverlayType(MapOverlayType.FOREGROUND_OVERLAY);
m_marker.setZIndex(100);
// You can get map from VenueMapFragment, for example.
getMap().addMapObject(m_marker);
}

Store sprites from spritesheet in array Libgdx

I have 960x960 spritesheet stored as a png inside of my Libgdx android assets. In a class I have specified towards initializing sprites for use in my game, I am trying to make it so there is a 120x120 sprite cut from the spritesheet (so there should be 64 items in the array). How am I able to do this? This is what I have tried in a similar situation:
public static Texture spritesheet;
public static Sprite[] textures = new Sprite[64];
...
//inside method that gets called once to initialize variables
spritesheet = new Texture(
Gdx.app.getType() == Application.ApplicationType.Android ?
"...Spritesheet.png" :
"android/assets/...Spritesheet.png"
);
spritesheet.setFilter(Texture.TextureFilter.Linear, Texture.TextureFilter.Linear);
for (int x = 0; x < 64; x ++) {
textures[x] = new Sprite(spritesheet, x, (x%8), 64, 64);
textures[x].flip(false, true);
}
I then render the sprite in other classes with this:
batch.draw(Assets.textures[0 /*this can be any number*/], (float) x, (float) y, 108, 108);
When I do this, it acts really weird. It says there are elements filled in the array, but there's still Array Index Out of Bounds Exceptions or the sprites just render crazily. Overall, it's not working out. What I'm trying to do is make it so I don't have to initialize 64 different sprites separately, and make it so I can easily change the sprite by changing the index inputted when rendering the sprite so I can do some other things later on, like an animation. How can I go about doing this?

You should use a TextureAtlas for this purpose. A atlas is a file generated automatically from separate images by the LibGDX TexturePacker. It stores everything from image bounds within your sheet to NinePatch information. All you need to do is put your separate images in a folder and run the TexturePacker on that folder. This will create a sheet and a .atlas/.pack file for you that can easily loaded.
There exists a TexturePackerGui if you have difficulty with the commandline but I do recommend the command line or even using it within your app.
What I usually do is create these sheets on the fly when I'm developing. I can easily overwrite separate images and they have a immediate effect after I run my app again. I start with creating a new folder images at the root of my project. Then for each pack I need I create another folder. For this example I create the folder tileset in images. In the DesktopLauncher I will setup this folder to produce a atlas from the images.
TexturePacker.Settings settings = new TexturePacker.Settings();
settings.maxWidth = 1024;
settings.maxHeight = 1024;
The settings file specifies everything about your atlas. The maximum size of a single sheet, if it should strip transparency from images, padding, rotation, etc. They are all very straightforward and you can look these all up in the documentation. Using these settings you can create your atlas.
TexturePacker.process(settings,
"../../images/tileset", //where to find the images to be packed.
"../../android/assets/tileset/", //where to store the atlas and sheet
"tileset"); //what filename to use
Now you can open your .atlas file and you see it uses the filenames as a alias. This alias is used to look them up but let's load the atlas first.
TextureAtlas atlas = new TextureAtlas("tileset/tileset.atlas");
By passing just a string to the constructor it looks by default in your local path which in turn is by default in android/assets/. Now we can ask the atlas to hand over our assets in the sheet.
atlas.findRegion("alias"); //hands over the image on the sheet named "alias"
Looking up textures like this is somewhat expensive. You don't want to look up many textures like this each update so you still need to store them somewhere.
If you name your image sequence like image_01.png, image_02.png, image_03.png it stores them all under the same name and within the atlas it sorts them bu it's index. So if you want a separate array of certain textures you can name them with _xx and get them all in one go:
atlas.findRegions("alias");
This is especially handy for Animation. Just copy your image sequence to a folder and specify it to be packed. Name your sequence correctly and give the regions to the animation. Everything will work right off the bat.
Loading a TextureAtlas with the AssetManager is pretty much the same as a normal Texture except you would specify it's from a TextureAtlas.class. You always load the .atlas which in turn handles your image.
I always use AssetDescriptor to load my assets. If I where you I would get rid of the static Assets.textures[] since that will get you into trouble sooner or later.
//None static AssetManager with getter
private AssetManager manager = new AssetManager();
public AssetManager getManager() { return manager; }
//Specify a descriptor for the atlas, this is static so I can acces it anywhere.
//It's just a descriptor of the asset so this is safe.
public static final AssetDescriptor<TextureAtlas> TileSet = new AssetDescriptor<TextureAtlas>("tileset/tileset.atlas", TextureAtlas.class);
//then just load everything
public void load()
{
manager.load(tileSet);
//... load other stuff
}
Now just pass the AssetManager object anywhere you need access to your assets and you can load any asset just like so:
TextureAtlas tileset = assetManager.get(Assets.TileSet);

I think your for loop should look like this
for(int x = 0; x < 64; x ++){
textures[x] = new Sprite(
spritesheet,
(x%8)*64, //where x=3, (3%8)*64 = 3*64 = 192px sourceX
(x/8)*64, //where x=3, (int)(3/8)*64 = 0*64 = 0px sourceY
64, //source width
64 //source height
);
Another test case where x=20;
(20%8)*64 = 4*64 = 256px SourceX
(20/8)*64 = 2*64 = 128px SourceY

import json using box2d , I do not see the imported object

I have a problem with the rendering of a json object created with Box2D Editor .
My problem is that even if the object septum (correctly according to the tutorial found online ) , it is not seen on the stage.
private void createBottle() {
// 0. Create a loader for the file saved from the editor.
BodyEditorLoader loader = new BodyEditorLoader(Gdx.files.internal("ball.json"));
// 1. Create a BodyDef, as usual.
BodyDef bd = new BodyDef();
bd.position.set(spaceShip.getX(), spaceShip.getY());
bd.type = BodyDef.BodyType.DynamicBody;
// 2. Create a FixtureDef, as usual.
FixtureDef fd = new FixtureDef();
fd.density = 1;
fd.friction = 0.5f;
fd.restitution = 0.3f;
// 3. Create a Body, as usual.
bottleModel = world.createBody(bd);
// 4. Create the body fixture automatically by using the loader.
loader.attachFixture(bottleModel, "test01", fd, 8);
}
In the create method i have this:
createBottle();
in the Render method:
Vector2 bottlePos = bottleModel.getPosition().sub(bottleModelOrigin);
bottleSprite.setPosition(bottlePos.x, bottlePos.y);
bottleSprite.setOrigin(bottleModelOrigin.x, bottleModelOrigin.y);
bottleSprite.setRotation(bottleModel.getAngle() * MathUtils.radiansToDegrees);
bottleSprite.draw(batch);
I do not understand why it is not added , I can not see on the screen .... I have other items assigned with the z position ... but nothing does not want to appear .
My goal is to enter the mazes made ​​with box2d editor and will move into a commanding object with a virtual joystick , this is the game I'm doing ...
if someone wants to enlighten me on how to import successfully , it is the first time you use an external editor with import json .
EDIT
I tried to follow the tutorial also before posting my question here on .
However the error is on Vector2 .... also the tutorial is clear but not working ... even online I saw other examples that they said that did not work ... there is not a resource running around? I have not found yet

You might try as it is stated here here:
LibGDX draws images with a reference to their bottom left corner. Therefore, if you left the reference point at the bottom left corner of your body, you can directly place the image at the location of the reference point (returned by Box2d engine with the getPosition() method).Else, if you changed the reference point location, you need to take it into account to draw the image.
Therefore, you need to store the reference point somewhere for later use:
bottleModelOrigin = loader.getOrigin("test01", BOTTLE_WIDTH).cpy();
Finally, in your render method, you can draw the image at the reference point location, offset by its local coordinates relatively to the image bottom left corner:
public void render() {
Vector2 bottlePos = bottleModel.getPosition().sub(bottleModelOrigin);
bottleSprite.setPosition(bottlePos.x, bottlePos.y);
bottleSprite.setOrigin(bottleModelOrigin.x, bottleModelOrigin.y);
bottleSprite.setRotation(bottleModel.getAngle() * MathUtils.radiansToDegrees);
}
The problem in your code seems to be that you don't have a variable named bottleModelOrigin atleast it is not visible in your first example. Although in that case a NullPointerException should have been thrown.

How to assign texture to a loaded OBJ file in java3d

I have a java 3d application and this application I load an OBJ file into my scene. How can I assign a texture (a jpg file) to this model?
To be more precise, when I want to assign texture to a primitive java object (e.g. sphere) I use the following:
Sphere sphere = new Sphere(Radius, Primflags, Appearance);
However, when loading and adding an obj file I do:
Scene scene = getSceneFromFile("OBJ file");
myBranchGroup = scene.getSceneGroup();
And in second case, I can find no way of assigning the texture. How should I do that?

You would have to use a program that you made the obj file or were you can load the file. Paint it, then export that file. Then add this code to it outside any methods
static TextureLoader loader = new TextureLoader("C:\\Users\\Sawyera\\Desktop\\Paint Layer 1.jpg",
"RGP", new Container());
static Texture texture = loader.getTexture();
Then
texture.setBoundaryModeS(Texture.WRAP);
texture.setBoundaryModeT(Texture.WRAP);
texture.setBoundaryColor(new Color4f(0.0f, 1.0f, 0.0f, 0.0f));
TextureAttributes texAttr = new TextureAttributes();
texAttr.setTextureMode(TextureAttributes.MODULATE);
Appearance ap = new Appearance();
ap.setTexture(texture);
ap.setTextureAttributes(texAttr);
int primflags = Primitive.GENERATE_NORMALS
+ Primitive.GENERATE_TEXTURE_COORDS;
ObjectFile loader = new ObjectFile(ObjectFile.RESIZE);
Then add this before you assign the model to the scene. Assuming the 3D model varrible is called model
model.setAppearance(ap);

IIRC you need to get the Shape3D node you want to apply the texture to (calling setAppearance(...)) from your branch group, e.g. by using getChild(index) etc. Note that you might to iterate recursively through the children, since the branch group you get might actually contain other groups, so you might find the shapes further down the group tree.
Alternatively you should be able to add an AlternateAppearance object to the branch group.