Android Open Source - SpaceGame Asteroid

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Back to project page SpaceGame.

License

The source code is released under:

Copyright (c) 2012 ??ukasz Patalas Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the So...

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Java Source Code

package com.lpatalas.spacegame;
//w w w  . ja v a2 s.  c o  m
import com.badlogic.gdx.Gdx;
import com.badlogic.gdx.graphics.Texture;
import com.badlogic.gdx.graphics.g2d.Sprite;
import com.badlogic.gdx.graphics.g2d.SpriteBatch;
import com.badlogic.gdx.math.MathUtils;
import com.badlogic.gdx.math.Rectangle;

/**
 * User: Lukasz
 * Date: 09.08.12
 */
class Asteroid {
  private final float movementSpeed;
  private final float rotationSpeed;
  private final Sprite sprite;
  private final float radius;

  public Asteroid(Texture texture) {
    this.movementSpeed = MathUtils.random(50.0f, 250.0f);
    this.radius = calculateRadius(texture);
    this.rotationSpeed = getRandomRotationSpeed();
    this.sprite = createSprite(texture);

    randomizePosition();
  }

  private float calculateRadius(Texture texture) {
    return Math.max(texture.getWidth(), texture.getHeight());
  }

  private float getRandomRotationSpeed() {
    boolean clockwiseDirection = MathUtils.randomBoolean();
    float speed = MathUtils.random(50.0f, 200.0f);

    if (clockwiseDirection)
      speed = -speed;

    return speed;
  }

  private Sprite createSprite(Texture texture) {
    Sprite sprite = new Sprite(texture);
    sprite.setOrigin(sprite.getWidth() / 2, sprite.getHeight() / 2);
    return sprite;
  }

  public boolean collidesWith(Rectangle bounds) {
    float x = sprite.getX() + sprite.getOriginX();
    float y = sprite.getY() + sprite.getOriginY();

    return bounds.contains(x, y);
  }

  public void update(float dt) {
    updateRotation(dt);
    updatePosition(dt);
  }

  private void updatePosition(float dt) {
    if (isOutOfScreen())
      randomizePosition();
    else {
      move(dt);
    }
  }

  private boolean isOutOfScreen() {
    return sprite.getX() < -radius;
  }

  private void randomizePosition() {
    float x = Gdx.graphics.getWidth() + MathUtils.random(Gdx.graphics.getWidth());
    float y = MathUtils.random(Gdx.graphics.getHeight());

    sprite.setPosition(x, y);
  }

  private void move(float dt) {
    float x = sprite.getX();
    x -= movementSpeed * dt;
    sprite.setX(x);
  }

  private void updateRotation(float dt) {
    float rotation = sprite.getRotation();
    rotation += rotationSpeed * dt;
    sprite.setRotation(rotation);
  }

  public void render(SpriteBatch spriteBatch) {
    sprite.draw(spriteBatch);
  }
}

Java Source Code List