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CameraShake.java
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CameraShake.java
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package com.antz.camera;
import com.badlogic.gdx.ApplicationAdapter;
import com.badlogic.gdx.Gdx;
import com.badlogic.gdx.audio.Music;
import com.badlogic.gdx.graphics.GL20;
import com.badlogic.gdx.graphics.Texture;
import com.badlogic.gdx.math.MathUtils;
import com.badlogic.gdx.scenes.scene2d.InputEvent;
import com.badlogic.gdx.scenes.scene2d.Stage;
import com.badlogic.gdx.scenes.scene2d.Touchable;
import com.badlogic.gdx.scenes.scene2d.ui.Image;
import com.badlogic.gdx.scenes.scene2d.ui.Label;
import com.badlogic.gdx.scenes.scene2d.ui.Skin;
import com.badlogic.gdx.scenes.scene2d.ui.Slider;
import com.badlogic.gdx.scenes.scene2d.ui.Table;
import com.badlogic.gdx.scenes.scene2d.ui.TextButton;
import com.badlogic.gdx.scenes.scene2d.utils.ClickListener;
import com.badlogic.gdx.utils.Align;
import com.badlogic.gdx.utils.viewport.FitViewport;
import com.badlogic.gdx.utils.viewport.Viewport;
import text.formic.Stringf;
/**
@author antz
@version 1.0.0
November 2022
See https://github.com/antzGames/libGDX-cameraShake for more information.
libGDX Camera Shake Demo
- tested on Desktop, HTML, and physical android devices
You can play with this demo on itch.io: https://antzgames.itch.io/camera-shaker-demo
*/
public class CameraShake extends ApplicationAdapter {
private Viewport viewport;
private Stage stage;
private float shakeRadius, minimumShakeRadius, radiusFallOffFactor;
private Slider shakeRadiusSlider, minimumShakeRadiusSlider, radiusFallOffSlider;
private Label shakeRadiusLabel, minimumShakeRadiusLabel, radiusFallOffLabel;
private Texture image;
private Music explosion;
private boolean isSoundOn = true;
private CameraShaker cameraShaker;
@Override
public void create() {
// Assign default values to parameters
shakeRadius = 30f; // must be positive
minimumShakeRadius = 3f; // must be positive and less than shakeRadius, aim for 5-15% of shake radius
radiusFallOffFactor = 0.90f; // must be greater than 0 and less than 1
// Setup the GUI
setupStage();
// Camera Shaker setup
cameraShaker = new CameraShaker(viewport.getCamera(), shakeRadius, minimumShakeRadius, radiusFallOffFactor);
// Start a camera shake
cameraShaker.startShaking();
}
@Override
public void render() {
Gdx.gl.glClearColor(0.15f, 0.15f, 0.2f, 1f);
Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT);
// Call camera shaker update method
cameraShaker.update(Gdx.graphics.getDeltaTime());
// draw User Interface
drawUI();
}
private void drawUI(){
// Update labels
shakeRadiusLabel.setText(Stringf.format("%.1f",shakeRadius));
minimumShakeRadiusLabel.setText(Stringf.format("Value: %.1f", minimumShakeRadius) + Stringf.format("\nPercent: %.1f", minimumShakeRadiusSlider.getValue()) + "%");
radiusFallOffLabel.setText(Stringf.format("%.2f",radiusFallOffFactor));
stage.act();
stage.draw();
}
private void setupStage() {
viewport = new FitViewport(Gdx.graphics.getWidth(), Gdx.graphics.getHeight());
stage = new Stage(viewport);
explosion = Gdx.audio.newMusic(Gdx.files.internal("explosion.mp3"));
Skin skin = new Skin(Gdx.files.internal("uiskin.json"));
// Slider UI elements
shakeRadiusSlider = new Slider(10.0f, 60f, 1.0f, false, skin);
shakeRadiusSlider.setValue(shakeRadius);
shakeRadiusSlider.setTouchable(Touchable.enabled);
shakeRadiusSlider.addListener(event -> {
shakeRadius = shakeRadiusSlider.getValue();
minimumShakeRadius = shakeRadius * minimumShakeRadiusSlider.getValue()/100f;
return false;
});
minimumShakeRadiusSlider = new Slider(1f, 99f, 1f, false, skin);
minimumShakeRadiusSlider.setValue(minimumShakeRadius/shakeRadius*100f);
minimumShakeRadiusSlider.setTouchable(Touchable.enabled);
minimumShakeRadiusSlider.addListener(event -> {
minimumShakeRadius = shakeRadius * minimumShakeRadiusSlider.getValue()/100f;
return false;
});
radiusFallOffSlider = new Slider(0.5f, 0.99f, 0.01f, false, skin);
radiusFallOffSlider.setValue(radiusFallOffFactor);
radiusFallOffSlider.setTouchable(Touchable.enabled);
radiusFallOffSlider.addListener(event -> {
radiusFallOffFactor = radiusFallOffSlider.getValue();
return false;
});
// LibGDX logo
image = new Texture("libgdx.png");
Image libGDXImage = new Image(image);
// Labels
shakeRadiusLabel = new Label(Stringf.format("%.1f",shakeRadius), skin);
minimumShakeRadiusLabel = new Label(Stringf.format("Value: %.1f", minimumShakeRadius) + Stringf.format("\nPercent: %.1f", minimumShakeRadiusSlider.getValue()) + "%" , skin);
radiusFallOffLabel= new Label(Stringf.format("%.2f",radiusFallOffFactor), skin);
// Buttons
TextButton shakeMeButton = new TextButton("CLICK ME TO RE-SHAKE!", skin);
shakeMeButton.setTouchable(Touchable.enabled);
shakeMeButton.addListener(new ClickListener() {
@Override
public boolean touchDown(InputEvent event, float x, float y, int pointer, int button) {
if (!cameraShaker.isCameraShaking() && !explosion.isPlaying()) {
cameraShaker.resetAndReconfigure(shakeRadius, minimumShakeRadius, radiusFallOffFactor);
cameraShaker.startShaking();
if(isSoundOn) explosion.play();
}
return false;
}
});
TextButton randomButton = new TextButton("Random Parameters", skin);
randomButton.setTouchable(Touchable.enabled);
randomButton.addListener(new ClickListener() {
@Override
public boolean touchDown(InputEvent event, float x, float y, int pointer, int button) {
if (!cameraShaker.isCameraShaking() && !explosion.isPlaying()) {
shakeRadius = MathUtils.random(10, 60);
radiusFallOffFactor = MathUtils.random(0.7f, 0.95f);
minimumShakeRadiusSlider.setValue(MathUtils.random(1, 15));
shakeRadiusSlider.setValue(shakeRadius);
radiusFallOffSlider.setValue(radiusFallOffFactor);
cameraShaker.resetAndReconfigure(shakeRadius, minimumShakeRadius, radiusFallOffFactor);
cameraShaker.startShaking();
if(isSoundOn) explosion.play();
}
return false;
}
});
TextButton defaultButton = new TextButton("Default Parameters", skin);
defaultButton.setTouchable(Touchable.enabled);
defaultButton.addListener(new ClickListener() {
@Override
public boolean touchDown(InputEvent event, float x, float y, int pointer, int button) {
if (!cameraShaker.isCameraShaking() && !explosion.isPlaying()) {
shakeRadius = 30f;
radiusFallOffFactor = 0.90f;
minimumShakeRadiusSlider.setValue(10f);
shakeRadiusSlider.setValue(shakeRadius);
radiusFallOffSlider.setValue(radiusFallOffFactor);
cameraShaker.resetAndReconfigure(shakeRadius, minimumShakeRadius, radiusFallOffFactor);
cameraShaker.startShaking();
if(isSoundOn) explosion.play();
}
return false;
}
});
TextButton toggleSoundButton;toggleSoundButton = new TextButton("Turn Sound Off", skin);
toggleSoundButton.setTouchable(Touchable.enabled);
toggleSoundButton.addListener(new ClickListener() {
@Override
public boolean touchDown(InputEvent event, float x, float y, int pointer, int button) {
if (isSoundOn) {
isSoundOn = false;
toggleSoundButton.setText("Turn Sound On");
} else {
isSoundOn = true;
toggleSoundButton.setText("Turn Sound Off");
}
return false;
}
});
// Table
Table table = new Table();
table.setFillParent(true);
table.top().center().align(Align.center);
table.defaults().center().pad(10,5,10,5);
table.row();
table.add(new Label("shakeRadius:", skin)).right();
table.add(shakeRadiusSlider).center();
table.add(shakeRadiusLabel).left();
table.row();
table.add(new Label("minShakeRadius as a\npercent of shakeRadius:", skin)).right();
table.add(minimumShakeRadiusSlider).center();
table.add(minimumShakeRadiusLabel).left();
table.row();
table.add(new Label("radiusFallOffFactor:", skin)).right();
table.add(radiusFallOffSlider).center();
table.add(radiusFallOffLabel).left();
table.row();
table.add(libGDXImage).colspan(3).padTop(30).center();
table.row();
table.add(shakeMeButton).colspan(3).padTop(30).center().height(60).fill();
table.row();
table.add(randomButton).center().height(30).fill();
table.add(toggleSoundButton).center().height(30).fill();
table.add(defaultButton).center().height(30).fill();
stage.addActor(table);
Gdx.input.setInputProcessor(stage);
}
@Override
public void resize(int width, int height) {
stage.getViewport().update(width, height, true);
}
@Override
public void dispose() {
image.dispose();
explosion.dispose();
stage.dispose();
}
}