Android Open Source - SpaceGame Stars

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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;
/*from  ww  w  . j  a  v  a  2  s .  c  o  m*/
import com.badlogic.gdx.Gdx;
import com.badlogic.gdx.graphics.Texture;
import com.badlogic.gdx.graphics.g2d.SpriteBatch;
import com.badlogic.gdx.math.MathUtils;
import com.badlogic.gdx.math.Vector2;

class Stars {
  private static final int STAR_COUNT = 20;
  private static final int STAR_LENGTH = 10;

  private final Vector2[] starPositions = new Vector2[STAR_COUNT];
  private final Texture texture;

  public Stars(Texture texture) {
    this.texture = texture;
  }

  public void initialize() {
    for (int i = 0; i < starPositions.length; i++) {
      starPositions[i] = new Vector2();
      randomizeStarPosition(starPositions[i], 0);
    }
  }

  public void render(SpriteBatch spriteBatch) {
    for (Vector2 starPosition : starPositions) {
      spriteBatch.draw(texture, starPosition.x, starPosition.y, STAR_LENGTH, 1);
    }
  }

  public void update(float deltaTime, float moveSpeed) {
    for (Vector2 starPosition : starPositions) {
      starPosition.x -= deltaTime * moveSpeed;
      if (isOutOfScreen(starPosition)) {
        randomizeStarPosition(starPosition, Gdx.graphics.getWidth());
      }
    }
  }

  private boolean isOutOfScreen(Vector2 starPosition) {
    return starPosition.x < 0;
  }

  private void randomizeStarPosition(Vector2 position, float xOffset) {
    position.x = MathUtils.random(xOffset, xOffset + Gdx.graphics.getWidth());
    position.y = MathUtils.random(Gdx.graphics.getHeight());
  }
}

Java Source Code List