I have an image that I want to move to the right. To do this I increase its x position by 200f*Gdx.graphics.getDeltaTime(); every time render is called. I've read other posts where people had similar problems but were they were not multiplying by delta or Gdx.graphics.getDeltaTime(). Because I obviously do this why is my image flickering/vibrating when its moving???
My code:
public class gm extends Game{
OrthographicCamera cam;
SpriteBatch batch;
Texture img;
float x = 0;
#Override
public void create () {
batch = new SpriteBatch();
img = new Texture("badlogic.jpg");
cam = new OrthographicCamera();
cam.setToOrtho(false, Gdx.graphics.getWidth(), Gdx.graphics.getHeight());
}
#Override
public void render () {
super.render();
//x += 200f*Gdx.graphics.getDeltaTime();
Gdx.gl.glClearColor(1, 0, 0, 1);
Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT);
cam.update();
batch.setProjectionMatrix(cam.combined);
batch.begin();
batch.draw(img, x += 100f*Gdx.graphics.getDeltaTime(), 0);
batch.end();
}
}
Related
I have an issue in LibGDX where when i call upon Gdx.input.getY(), it selects a pixel that's on the other side of the application relative to the center of the screen.
public class Main extends ApplicationAdapter {
private SpriteBatch batch;
private Texture img;
private OrthographicCamera camera;
int xPos;
int yPos;
private Vector3 tp = new Vector3();
BitmapFont font;
#Override
public void create () {
batch = new SpriteBatch();
img = new Texture("crosshair.png");
camera = new OrthographicCamera();
camera.setToOrtho(false, 1280, 720);
font = new BitmapFont();
}
#Override
public void render () {
yPos = Gdx.input.getY();
xPos = Gdx.input.getX();
Gdx.gl.glClearColor(0, 0, 0, 1);
Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT);
camera.unproject(tp.set(xPos, yPos, 0));
batch.begin();
font.draw(batch,xPos + " , " + yPos, Gdx.input.getX() - 25, Gdx.input.getY() - 5);
batch.draw(img, xPos, yPos);
batch.end();
}
#Override
public void dispose () {
batch.dispose();
img.dispose();
}
Subtracting the viewport height with the touch location won't work, because that would be subtracting world coordinates with touch coordinates. (and even for a pixel perfect projection it would be height - 1 - y). Instead use the unproject method to convert touch coordinates to world coordinates.
There are two problems with your code:
You are never setting the batch projection matrix.
Even though you are using the unproject method, you are never using its result.
So instead use the following:
#Override
public void render () {
Gdx.gl.glClearColor(0, 0, 0, 1);
Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT);
batch.setProjectionMatrix(camera.combined);
batch.begin();
camera.unproject(tp.set(Gdx.input.getX(), Gdx.input.getY(), 0));
font.draw(batch,tp.x+ " , " + tp.y, tp.x - 25, tp.y - 5);
batch.draw(img, tp.x, tp.y);
batch.end();
}
I would suggest to read the following pages, which describe this and the reasoning behind it in detail:
https://github.com/libgdx/libgdx/wiki/Coordinate-systems
https://xoppa.github.io/blog/pixels/
https://github.com/libgdx/libgdx/wiki/Viewports
It's better to try this
yPos = camera.viewportHeight - Gdx.input.getY();
I'm very new to programming so bear with me here...
I'm making a basic 2d android game. I am trying to simply make a sprite jump up in the air a bit and then land back to where it originally started. The sprite that I want to jump is "ball2". This is my code so far (Basically just added textures and the sprite in the correct position to start the jump but haven't done anything else).
Any help is appreciated.
public class MyGdxGame extends ApplicationAdapter {
SpriteBatch batch;
Texture background;
Texture ball;
Texture spike1;
Texture spike2;
#Override
public void create () {
batch = new SpriteBatch();
background = new Texture("gamebackground.png");
ball = new Texture("ball2.png");
ball.setFilter(Texture.TextureFilter.Nearest, Texture.TextureFilter.Nearest);
spike1 = new Texture("spike1.png");
spike1.setFilter(Texture.TextureFilter.Nearest, Texture.TextureFilter.Nearest);
spike2 = new Texture("spike2.png");
}
#Override
public void render () {
batch.begin();
float scaleFactor = 2.0f;
batch.draw(background, 0, 0, Gdx.graphics.getWidth(), Gdx.graphics.getHeight());
batch.draw(ball, 80, 145, ball.getWidth() * scaleFactor, ball.getHeight() * scaleFactor);
batch.end();
}
#Override
public void render () {
batch.begin();
float scaleFactor = 2.0f;
batch.draw(background, 0, 0, Gdx.graphics.getWidth(), Gdx.graphics.getHeight());
batch.draw(ball, 80, 145, ball.getWidth() * scaleFactor, ball.getHeight() * scaleFactor);
batch.end();
Gdx.input.setInputProcessor(new InputAdapter () {
#Override
public boolean keyDown (int keycode) {
if(keycode==Keys.UP)
{
ball.setHeight(ball.getHeight()+50);
}
return true;
}
}
}
Then you need to add the timer down down or you could add down button. Not sure if you have spikes on the top as well. I don't know what it's supposed to look like.
So, I just want to draw Box2DDebugRenderer same with sprite size.
I have use same SpriteBatch same Camera and same Viewport. It took me 8 hours, tried finding a solution around google and still not solve the problem.
Here what I got:
I just change this line:
PolygonShape shape = new PolygonShape();
shape.setAsBox(32, 32);
Some tutorial said to div by 2. I tried that I got result like 2nd picture.
Here my script
PlayScreen.java:
public class PlayScreen implements Screen {
private SpriteBatch batch;
private TiledMap tileMap;
private TiledMapRenderer tiledMapRenderer;
private OrthographicCamera cam;
private Player player;
private World world;
private Box2DDebugRenderer debugRenderer;
private FitViewport gamePort;
public PlayScreen(HookaHookaGame game) {
this.batch = game.getSpriteBatch();
this.world = new World(new Vector2(0, -20), true);
// Create cam
cam = new OrthographicCamera();
gamePort = new FitViewport(800, 600, cam);
gamePort.apply(true);
//initially set our gamcam to be centered correctly at the start of of map
// cam.position.set(400, 300, 0);
// cam.update();
// Load tilemap
tileMap = new TmxMapLoader().load("simulation01.tmx");
tiledMapRenderer = new OrthogonalTiledMapRenderer(tileMap, batch);
// Create box2d debug renderer
debugRenderer = new Box2DDebugRenderer();
// Create player sprite
player = new Player(this.world);
}
#Override
public void show() {
}
#Override
public void render(float delta) {
//cam.update();
// Update sprite
player.update(delta);
//Clear the game screen with Black
Gdx.gl.glClearColor(0, 0, 0, 1);
Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT);
// Draw tilemap
tiledMapRenderer.setView(cam);
tiledMapRenderer.render();
// Set camera to spritebatch
batch.setProjectionMatrix(cam.combined);
// Draw sprite
batch.begin();
batch.draw(player.getKeyFrame(), 300, 300);
player.draw(batch);
batch.end();
// Draw box2d debug renderer
debugRenderer.render(world, cam.combined);
}
#Override
public void resize(int width, int height) {
gamePort.update(width, height);
}
#Override
public void pause() {
}
#Override
public void resume() {
}
#Override
public void hide() {
}
#Override
public void dispose() {
}
}
Player.java, extended from Sprite Class:
public class Player extends Sprite {
private Animation anim;
private float stateTimer;
private World world;
private Body body;
// Debug
public Player(World world) {
stateTimer = 0;
this.world = world;
loadAnim();
}
private void loadAnim() {
Array<TextureRegion> temp = new Array<TextureRegion>(40);
Texture texture = new Texture("sprite.png");
temp.add(new TextureRegion(texture, 3*32, 3*32, 32, 32));
temp.add(new TextureRegion(texture, 2*32, 3*32, 32, 32));
temp.add(new TextureRegion(texture, 32, 3 * 32, 32, 32));
temp.add(new TextureRegion(texture, 0, 3*32, 32, 32));
anim = new Animation(0.1f, temp, Animation.PlayMode.LOOP);
BodyDef bodyDef = new BodyDef();
bodyDef.position.set(100, 100);
bodyDef.type = BodyDef.BodyType.DynamicBody;
body = world.createBody(bodyDef);
PolygonShape shape = new PolygonShape();
shape.setAsBox(32, 32);
FixtureDef fixture = new FixtureDef();
fixture.shape = shape;
body.createFixture(fixture);
setBounds(0, 0, 32, 32);
setPosition(100, 100);
}
public void update(float delta) {
stateTimer += delta;
setRegion(getKeyFrame());
setSize(32, 32);
}
public TextureRegion getKeyFrame() {
return anim.getKeyFrame(stateTimer, true);
}
}
Could you explain what happen exactly?
Box2d and Textures have different origins.
The origin of the body is its center.
The origin of the Texture is the bottom left corner.
As you can see, the center of the box2d object is exactly at the bottom left corner of the texture, if you draw them both at the same position.
Pseudo code:
batch.draw(texture, body.x - texture.width / 2, body.y - texture.heigth / 2);
Otherwise you could set the origin of the box2d body to "the bottom left corner", but that might give you trouble if you follow other tutorials.
you can also put the origin of your sprite to center by calling the function setOriginCenter() of your Sprites before drawing them
so the spritebatch will draw them from center just like your box
Can someone just give me a real quick answer on how i would implement a viewport so this sprite would fill the whole screen?
Thanks
Current code (not working):
public SplashScreen(Jump game)
{
this.game = game;
cam = new OrthographicCamera();
cam.setToOrtho(false, 1920, 1080);
sb = new SpriteBatch();
}
public void show()
{
}
public void render(float delta)
{
Gdx.gl20.glClearColor(0.2F, 0.6F, 1F, 1F);
Gdx.gl20.glClear(GL20.GL_COLOR_BUFFER_BIT);
cam.update();
sb.setProjectionMatrix(cam.combined);
sb.begin();
sb.draw(Assets.splash_spr_background, 0, 0);
sb.end();
}
On
#Override
public void resize(int width, int height) {
stage.getViewport().update(Gdx.graphics.getWidth(),
Gdx.graphics.getHeight(), false);
}
as spritebatch does not have a viewport. You have to control this using stage or cam.
you can do that.
I have this approach which works and scales as expected on Windows Desktop:
public class MyGdxGame extends ApplicationAdapter {
SpriteBatch m_batch;
FitViewport m_viewport;
OrthographicCamera m_camera;
private Texture img;
private BitmapFont m_font;
#Override
public void create() {
Gdx.app.setLogLevel(Application.LOG_NONE);
m_batch = new SpriteBatch();
m_camera = new OrthographicCamera();
m_camera.position.set(640 / 2f, 400 / 2f, 0);
m_camera.update();
m_viewport = new FitViewport(640, 400, m_camera);
img = new Texture("badlogic.jpg");
m_font = new BitmapFont();
}
#Override
public void render() {
Gdx.gl.glClearColor(1, 0, 0, 1);
Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT);
m_batch.begin();
m_font.draw(m_batch, "X000000000000000000000000000000000000000000000000000000000000000000000000000000X", 0, m_camera.viewportHeight);
m_batch.draw(img, 0, 0);
m_batch.end();
}
#Override
public void resize(int width, int height) {
m_viewport.update(width, height);
}
}
Initial Window Size:
Bigger Window Size
But if I deploy to Android (in this case Nexus 7 2013) it seems not to scale properly:
Why does it not work? How to solve this?
You forgot to use the camera in your sprite batch. Call
spriteBatch.setProjectionMatrix(viewport.getCamera().combined);
before spriteBatch.begin();.