Method to detect a click on a text in LibGdx - java

How can I detect a click on a text using LibGdx? For example, I want the user to be able to click on the String Show Highscore. The problem I'm having is that I already implemented an if-statement, which states that if anything is clicked on, the game starts. What kind of method do I have to write now, so that the user can click on Show Highscore? I can change the if statement which uses the whole screen, if necessary. Thanks :)
public class MainMenuScreen implements Screen {
final FlappyWizardGame game;
OrthographicCamera camera;
String buttonHighscore = "Show Highscore";
public MainMenuScreen(FlappyWizardGame game) {
this.game = game;
camera = new OrthographicCamera();
camera.setToOrtho(false, 1280, 720);
screenHeight = Gdx.graphics.getHeight();
}
#Override
public void render(float delta) {
Gdx.gl.glClearColor(0, 0, 0.2f, 1);
Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT);
camera.update();
game.batch.setProjectionMatrix(camera.combined);
game.batch.begin();
game.batch.draw(game.hermine, 0, 0, (int)(game.hermine.getWidth() * 0.25), (int)(game.hermine.getHeight() * 0.25));
game.font.draw(game.batch, "Welcome to Flappy Wizard!!! ", camera.viewportWidth / 3, camera.viewportHeight - 100);
game.font.draw(game.batch, "Tap anywhere to begin!", camera.viewportWidth / 3, camera.viewportHeight - 150);
game.font.draw(game.batch, buttonHighscore, camera.viewportWidth / 3, camera.viewportHeight - 200);
if (Gdx.input.isTouched()) {
game.setScreen(new GameScreen(game));
dispose();
}
}

You must create a Rectangle around the Text:
Rectangle rectangle = new Rectangle(x, y, width, height);
And then in your if statement check if the touch event is in the Rectangle:
if(Gdx.input.isTouched()){
if(rectangle.contains(Gdx.input.getX(), Gdx.input.getY())){
openHighscore();
} else{
game.setScreen(new GameScreen(game));
dispose();
}
}

Answer by Morchul is correct although for UI Screen you probably want to consider using LibGDX's Scene2D component. It allows you to easily create Label, button, menu and detect click event by adding listener to them.

Related

The text drawn using "batch" is hidden by a rectangle drawed using "renderer"

I've just begun using LibGDX and I'm encountering a problem using batch:
I have a render method in my HomeScreen that renders pretty much everything on the screen, including some Buttons. In my class Button, I render the buttons and afterwards, I use a batch to draw a text. The problem is that the text is drawn behind the rectangle of the button (even if the batch begins after the renderer of the rectangle) don't know if it's clear so here's some code:
In the Screen class:
public void render(float delta) {
Gdx.gl.glClearColor(0, 0, 0, 1);
Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT);
viewport.apply();
vector3.set(Gdx.input.getX(), Gdx.input.getY(), 0);
viewport.unproject(vector3);
renderer.setProjectionMatrix(camera.combined);
renderer.setAutoShapeType(true);
renderer.begin(ShapeRenderer.ShapeType.Filled);
homeStars.render(renderer);
for (Button button: buttons)
{
button.render(renderer);
}
renderer.setColor(1,1,1,1);
//realCursor = cursorToWorldPosition(Gdx.input.getX(),Gdx.input.getY());
//renderer.circle((vector3.x+1)*Const.WORLD_WIDTH/2,(vector3.y+1)*Const.WORLD_HEIGHT/2,5);
renderer.circle(vector3.x,vector3.y,5);
renderer.set(ShapeRenderer.ShapeType.Line);
for(HomeStar star : HomeStars.stars)
{
if(vector3.dst(star.position)<Const.MAX_DIST_MOUSE_STAR){
renderer.line(vector3.x, vector3.y,star.position.x,star.position.y,Color.WHITE, Color.BLUE);
}
}
}
And in the Button class:
public void render(ShapeRenderer renderer){
if (mouseOn() == true){
renderer.rect(position.x-width/2,position.y-height/2,width, height, Color.BLACK, Color.VIOLET, Color.BLACK, Color.VIOLET);
}
else if (mouseOn() == false){
renderer.rect(position.x-width/2,position.y-height/2,width, height, Color.BLACK, Color.GRAY, Color.BLACK, Color.GRAY);
}
batch.begin();
font.draw(batch, "yo", position.x, position.y);
batch.end();
}
Any help would be much appreciated, thank you!
You can't nest SpriteBatch and ShapeRenderer. Make sure to call renderer.end() before calling batch.begin() and then call renderer.begin() after calling batch.end():
renderer.end();
batch.begin();
font.draw(batch, "yo", position.x, position.y);
batch.end();
renderer.begin();
Since you are learning, that should do it for now. Note however that this will get quickly very inefficient, because it defeats the purpose of batching. You should avoid constantly switching between ShapeRenderer and SpriteBatch. SpriteBatch is perfect to render rectangles, so you might want to work to using only SpriteBatch for your buttons (or use scene2 for UI).

Making a ellipse object in libgx java android game

I have tried to make a ellipse object in libgdx. Sorry if i can't describe properly but im a newbie in java.
My code looks like:
public class GameScreen implements Screen{
MyGame game;
OrthographicCamera camera;
SpriteBatch batch;
...
Ellipse playBounds;
public GameScreen(MyGame game) {
this.game = game;
camera = new OrthographicCamera();
camera.setToOrtho(false, 1080, 1920);
batch = new SpriteBatch();
state = GAME_READY;
touchPoint = new Vector3();
pauseBounds = new com.badlogic.gdx.math.Rectangle(1080-128,1920-128,128,128);
playBounds= new Ellipse()
}
...
public void render(float delta) {
Gdx.gl.glClearColor(1F, 1F, 1F, 1F);
Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT);
camera.update();
generalupdate();
batch.setProjectionMatrix(camera.combined);
batch.begin();
batch.draw(Assets.sprite_bg, 0, 0);
switch (state){
case GAME_READY:{
batch.draw(Assets.sprite_startScreen, 0, 0);
batch.draw(Assets.sprite_playButton,218,800,644,225);
break;
}
Basically it draws background, a welcome screen and a button(with "play" on it)
So here i made a touch detection.
if (Gdx.input.justTouched()) {
camera.unproject(touchPoint.set(Gdx.input.getX(), Gdx.input.getY(), 0));
if (state==GAME_READY);
if (playBounds.contains(touchPoint.x, touchPoint.y)) {
state=GAME_RUNNING;
Drawing works fine but the problem is when i touch the button it doesnt work instead if i touch near it game starts as it should
Alright, ignoring the several errors in the code which I will just assume were made here instead of the actual code, I believe the problem could be that you are not setting the values in the Ellipse. By this I mean the width, height, x, and y.
An nice way to do this would be to use the constructor:
Ellipse(float x, float y, float width, float height)
instead of just :
Ellipse()
That way you can set the values right away. Refer to this website for more info in Ellipses for LibGDX.
If that doesn't solve your problem you may have to post a little more of the relevant parts of your code.

Why doesn't SpriteBatch draw anything (LibGdx)?

This is from day 6 of the flappy bird recreation tutorial
-http://www.kilobolt.com/day-6-adding-graphics---welcome-to-the-necropolis.html
Here is the image file i am using for texture in my game. It is a 256px x 64px .png file.
Here is the class that I used for loading the texture and the specific TextureRegion(part of the texure) that I want the SpriteBatch to draw.
public class AssetLoader {
public static Texture texture;
public static TextureRegion bg;
public static void load() {
texture = new Texture(Gdx.files.internal("data/texture.png"));
bg = new TextureRegion(texture, 0, 0, 136, 43);
}
}
And I call AssertLoader.load(), along with setting up game screen from
public class MyGdxGame extends Game{
#Override
public void create() {
AssetLoader.load();
setScreen(new GameScreen());
}
}
And inside GameScreen.java
public class GameScreen implements Screen {
//delegate render task
private GameRenderer renderer;
public GameScreen() {
float screenHeight = Gdx.graphics.getHeight();
float screenWidth = Gdx.graphics.getWidth();
float gameWidth = 136;
float gameHeight = screenHeight / (screenWidth / gameWidth);
renderer = new GameRenderer((int)gameHeight);
}
}
And inside GameRederer, the class I delegate to render the game
public class GameRenderer {
private int gameHeight;
private SpriteBatch batch;
private OrthographicCamera cam;
public GameRenderer(int gameHeight) {
this.gameHeight = gameHeight;
cam = new OrthographicCamera();
batch = new SpriteBatch();
batch.setProjectionMatrix(cam.combined);
cam.setToOrtho(true, 136, gameHeight);
}
public void render() {
Gdx.gl.glClearColor(0, 0, 0, 1);
Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT);
batch.begin();
batch.disableBlending();
batch.draw(AssetLoader.bg, 0, (gameHeight/2) + 23, 136, 43);
batch.end()
}
}
What I get when I run the desktop version of the game is the black screen shown above(black because i set the background to black with these lines of code
Gdx.gl.glClearColor(0, 0, 0, 1);
Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT);
Does anyone know why the SpritchBatch drawing isn't showing up? I extracted the texture portion of the texture I wanted with this line of code(starts from 0,0, width of 136, height of 43) - used GIMP - to find out portion to cut.
bg = new TextureRegion(texture, 0, 0, 136, 43);
I also put a few log statements(removed them from view) to ensure that before drawing, bg's width and height were set correctly, which they were. And the issue can't be game height because I used a print statement and found that to be 204 which means that this expression, (gameHeight/2) + 23 will evaluate to 125 which is in bounds between 0 and game height.
I checked out other threads as well.
My issue can't be libgdx spritebatch not rendering textures because the SpriteBatch should overwrite the background.
And it can't be LibGDX: Android SpriteBatch not drawing because i am running mine on desktop, not andorid.
could be that you have to first put cam.setToOrtho(true, 136, gameHeight);before the batch, so I can not confirm hopefully help
public GameRenderer(int gameHeight) {
this.gameHeight = gameHeight;
cam = new OrthographicCamera();
batch = new SpriteBatch();
cam.setToOrtho(true, 136, gameHeight);
batch.setProjectionMatrix(cam.combined);
}
If anyone's having a similar issue, the way I solved the problem was to call
batch.setProjectionMatrix(cam.combined);
after
cam.setToOrtho(true, 136, gameHeight);
Which didn't really make sense to me because it's still the same Matrix4 in Camera.java, that is
public final Matrix4 combined = new Matrix4();
Was hoping someone else could clarify that.

Stage draws over everything

public void render(float delta) {
Gdx.gl.glClearColor(0, 0, 0.2f, 1);
Gdx.gl.glClear(GL10.GL_COLOR_BUFFER_BIT);
stage.act(delta);
batch.setProjectionMatrix(camera.combined);
batch.begin();
if (lifeCount > 0) {
/*
When stage.draw is called here, it only displays the exit button.
The game still operates, but everything is invisible.
If I leave the game on, the game over screen is shown,
*/
stage.draw();
text.setColor(1.0f, 1.0f, 1.0f, 1.0f);
text.draw(batch, score + scoreCount, 25, 100);
text.draw(batch, lives + lifeCount, 25, 120);
text.draw(batch, speed + raindropSpeed, 25, 80);
batch.draw(bucketTexture, bucket.x, bucket.y);
for (Rectangle clearDrop : clearDrops) {
batch.draw(clearDropTexture, clearDrop.x, clearDrop.y);
}
for (Rectangle healthDrop : healthDrops) {
batch.draw(healthDropTexture, healthDrop.x, healthDrop.y);
/*
If I place stage.draw here, health drops are invisible.
This also happens if I place it in the raindrop for-loop and the
cleardrop for-loop
*/
}
for (Rectangle raindrop : raindrops) {
batch.draw(raindropTexture, raindrop.x, raindrop.y);
}
/*
If I place stage.draw here, the bucket, score, life, and speed
display correctly. The drops are still invisible.
*/
} else {
pause();
raindrops.clear();
game.setScreen(new GameOver(game));
}
batch.end();
What I have been trying to do is have an exit button in the top right corner of the GameScreen, although drawing the stage which the button resides in gives me difficulties (see comments in code).
Here is my code for the exit button and stage (resize()):
if (stage == null)
stage = new Stage(width, height, true);
stage.clear();
Gdx.input.setInputProcessor(stage);
TextButtonStyle styleQuit = new TextButtonStyle();
styleQuit.up = skin.getDrawable("buttonnormal");
styleQuit.down = skin.getDrawable("buttonpressed");
styleQuit.font = text;
quitButton = new TextButton(" ", styleQuit);
quitButton.setWidth(128);
quitButton.setHeight(128);
quitButton.setX(800 - 128);
quitButton.setY(480 - 100);
quitButton.addListener(new InputListener() {
public boolean touchDown(InputEvent event, float x, float y,
int pointer, int button) {
return true;
}
public void touchUp(InputEvent event, float x, float y,
int pointer, int button) {
Gdx.app.log(RainCatcher.LOG, "Quit Button Pressed");
game.setScreen(new MainMenu(game));
}
});
stage.addActor(quitButton);
And the rest (in show())
atlas = new TextureAtlas("gamebuttons.pack");
skin = new Skin();
skin.addRegions(atlas);
text = new BitmapFont();
Is there any special trick to allow a stage to be rendered alongside with the falling raindrops, bucket, and text? My friends and I have been stumped and couldn't find a solution anywhere.
Move stage.draw() after batch.end() or before batch.begin()
This is not the right approach you're taking in my opinion. If you're using a stage in libgdx, then you should benefit from other components of Scene2d. So, rather than drawing your raindrops and other game entities separately (and making your job complicated), you should make them actors and add them to stage wherever you need and then draw the stage in the render.
For example:
public class RaindDrop extends Actor {
TextureRegion region;
public RaindDrop () {
region = new TextureRegion(...);
}
public void draw (SpriteBatch batch, float parentAlpha) {
Color color = getColor();
batch.setColor(color.r, color.g, color.b, color.a * parentAlpha);
batch.draw(...);
}
}
So on for other entities. Initialise and add them to your stage.
Here's the official wiki to read more:
https://code.google.com/p/libgdx/wiki/scene2d

Draw a sprite onto the map not to the screen

I'm using libgdx and I have a tiled map which i want to draw the sprite onto. However the sprite is drawn onto the actual window so when I move the camera, the sprite stays in the same place. ?I want to the sprite to move on the map.
This is how i currently render my objects
#Override
public void render(float delta) {
translateCamera();
Gdx.gl.glClearColor(0, 0, 0, 1);
Gdx.gl.glClear(GL10.GL_COLOR_BUFFER_BIT);
camera.update();
renderer.setView(camera);
renderer.render(bgLayers);
batch.begin();
batch.draw(splayerSprite, Gdx.graphics.getWidth() / 2,
Gdx.graphics.getHeight() / 2);
batch.end();
renderer.render(fgLayers);
}
It always end up being in the middle of the screen, however I want to be able to move them seperatly like for example the camera with (W,A,S,D) and move my player with the direction keys. Then if I want the camera locks onto the player but other wise its free.
I'm new to libgdx so please bear with me, Thanks
The problem is the SpriteBatch projection matrix isn't being set to the Camera projection matrix. This means the Sprite is not being rendered relative to the Camera. This is why the camera is moving, but the sprite is not; the correct matrix is not being used.
Also the sprite is being rendered always at half the screen's width, and half the screen's height. To fix this Call sprite.draw. This will use the Sprite's internal position.
Set the SpriteBatch projection matrix via batch.setProjectionMatrix(camera.combined). This will cause the sprite to be rendered relative to the camera.
#Override
public void render(float delta) {
translateCamera();
Gdx.gl.glClearColor(0, 0, 0, 1);
Gdx.gl.glClear(GL10.GL_COLOR_BUFFER_BIT);
camera.update();
renderer.setView(camera);
renderer.render(bgLayers);
//here's the line that was missing.
batch.setProjectionMatrix(camera.combined);
batch.begin();
//be sure to call this instead of specifying position yourself!
splayerSprite.draw(batch);
batch.end();
renderer.render(fgLayers);
}
You'll still need to handle snapping the camera's position to the sprite's position whenever WASD is pressed, but that's trivial.
//snap the camera to the sprite's center.
if(wasd_isDown){
float centerX = sprite.getX()+sprite.getWidth()/2;
float centerY = sprite.getY()+sprite.getHeight()/2;
camera.position.set(x,y, 0);
}
If direction keys are pressed, just translate the camera's position vector via Vector3.add like so:
if(!wasd_isDown){
float deltaX = 0;
float deltaY = 0;
float MOVE_DIST = 10;//or whatever you need.
if(leftPressed) deltaX = -MOVE_DIST;
else if(rightPressed) deltaX = MOVE_DIST;
if(upPressed)deltaY = MOVE_DIST;
else if(downPressed)deltaY = -MOVE_DIST;
camera.position.add(deltaX, deltaY, 0);
}
This will allow the camera to move independently only when the player uses directional keys, and will allow the sprite be be rendered in relation to the camera's orientation. It will also snap the camera immediately back to the sprite when WASD is pressed.
batch.draw(splayerSprite, Gdx.graphics.getWidth() / 2, Gdx.graphics.getHeight() / 2);
You are telling the code to draw it to the center of your screen every time. You need to change Gdx.graphics.getWidth() / 2 and Gdx.graphics.getHeight() / 2 to actual values that change based on your input.
Edit #2: The line batch.setProjectionmatrix(camera.combined); is needed in addition to everything I have mentioned, I both did not notice that specific line was already in my code (it is included in the default libGDX project), and did not try running my demo with that line removed. I hope that clears up any confusion I may have caused.
Edit: Since apparently nobody really liked my answer, I went and wrote a demo using the controls specified in a clean libGDX game. Regardless of where the camera is aimed at (since it is being translated), the sprite was always being rendered in the center of the global screen. It is very much necessary to use the sprite's position in the batch.draw() instead of a static position, otherwise it will not move.
package com.me.mygdxgame;
import com.badlogic.gdx.ApplicationListener;
import com.badlogic.gdx.Gdx;
import com.badlogic.gdx.Input.Keys;
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.Vector2;
public class MyGdxGame implements ApplicationListener {
private OrthographicCamera camera;
private SpriteBatch batch;
private Texture texture;
private Sprite sprite;
private Sprite background;
private boolean lockToSprite;
private Vector2 vecCamera;
private Vector2 vecSprite;
#Override
public void create() {
float w = Gdx.graphics.getWidth();
float h = Gdx.graphics.getHeight();
camera = new OrthographicCamera(w, h);
batch = new SpriteBatch();
lockToSprite = true;
vecCamera = new Vector2();
vecSprite = new Vector2();
texture = new Texture(Gdx.files.internal("data/libgdx.png"));
texture.setFilter(TextureFilter.Linear, TextureFilter.Linear);
TextureRegion region = new TextureRegion(texture, 0, 0, 512, 275);
sprite = new Sprite(region);
sprite.setSize(0.1f * sprite.getWidth(), 0.1f * sprite.getHeight());
sprite.setOrigin(sprite.getWidth()/2, sprite.getHeight()/2);
sprite.setPosition(-sprite.getWidth()/2, -sprite.getHeight()/2);
background = new Sprite(region);
background.setOrigin(background.getWidth() / 2, background.getHeight() / 2);
System.out.println(background.getOriginX());
background.setPosition(-background.getWidth() / 2, -background.getHeight() / 2);
}
#Override
public void dispose() {
batch.dispose();
texture.dispose();
}
#Override
public void render() {
camera.translate(vecCamera);
Gdx.gl.glClearColor(1, 1, 1, 1);
Gdx.gl.glClear(GL10.GL_COLOR_BUFFER_BIT);
camera.update();
camera.translate(vecCamera.cpy().mul(-1));
float moveSensitivity = 0.9f;
Vector2 vecInputSprite = new Vector2();
if (Gdx.input.isKeyPressed(Keys.UP))
vecInputSprite.y += moveSensitivity;
if (Gdx.input.isKeyPressed(Keys.DOWN))
vecInputSprite.y -= moveSensitivity;
if (Gdx.input.isKeyPressed(Keys.LEFT))
vecInputSprite.x -= moveSensitivity;
if (Gdx.input.isKeyPressed(Keys.RIGHT))
vecInputSprite.x += moveSensitivity;
if (Gdx.input.isKeyPressed(Keys.N))
vecSprite.set(new Vector2());
Vector2 vecInputCamera = new Vector2();
if (Gdx.input.isKeyPressed(Keys.W))
vecInputCamera.y += moveSensitivity;
if (Gdx.input.isKeyPressed(Keys.S))
vecInputCamera.y -= moveSensitivity;
if (Gdx.input.isKeyPressed(Keys.A))
vecInputCamera.x -= moveSensitivity;
if (Gdx.input.isKeyPressed(Keys.D))
vecInputCamera.x += moveSensitivity;
if (Gdx.input.isKeyPressed(Keys.R)) {
vecCamera.set(new Vector2());
lockToSprite = false;
}
if (vecInputCamera.len2() != 0)
lockToSprite = false;
else if (Gdx.input.isKeyPressed(Keys.L))
lockToSprite = true;
if (lockToSprite) {
vecCamera.set(vecSprite);
} else {
vecCamera.add(vecInputCamera);
}
vecSprite.add(vecInputSprite);
batch.setProjectionMatrix(camera.combined);
batch.begin();
background.draw(batch);
sprite.setPosition(vecSprite.x, vecSprite.y);
sprite.draw(batch);
//batch.draw(sprite, vecSprite.x, vecSprite.y);
batch.end();
}
#Override
public void resize(int width, int height) {
}
#Override
public void pause() {
}
#Override
public void resume() {
}
}

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