Android Open Source - SpaceGame Player

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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 .  j a va 2  s.co  m
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.Rectangle;
import com.badlogic.gdx.math.Vector2;

/**
 * User: Lukasz
 * Date: 11.08.12
 */
class Player {
  private final Vector2 initialPosition;
  private final Vector2 position = new Vector2();
  private Vector2 targetPosition;
  private final Texture texture;
  private final Vector2 velocity = new Vector2(0, 0);

  public Player(Texture texture, Vector2 initialPosition) {
    this.texture = texture;
    this.initialPosition = initialPosition;
  }

  public Rectangle getBoundingRectangle() {
    float width = texture.getWidth();
    float height = texture.getHeight() / 2;

    return new Rectangle(position.x - width / 2, position.y - height / 2, width, height);
  }

  public Vector2 getPosition() {
    return position.cpy();
  }

  public void reset() {
    position.set(initialPosition);
    targetPosition = null;
    velocity.set(0, 0);
  }

  public void moveTo(Vector2 position) {
    targetPosition = position.cpy();
  }

  public void render(SpriteBatch spriteBatch) {
    spriteBatch.draw(texture, position.x - texture.getWidth() / 2, position.y - texture.getHeight() / 2);
  }

  public void update(float dt) {
    if (targetPosition != null)
      moveTowardsTarget(dt);
  }

  private void moveTowardsTarget(float dt) {
    final float mass = 1.0f;
    final float k = 200.0f;
    final float b = 200.0f;

    Vector2 toTarget = getVectorToTarget();
    Vector2 damping = velocity.cpy().mul(b);
    Vector2 force = toTarget.mul(k).sub(damping);

    Vector2 acc = force.mul(dt * mass);
    velocity.add(acc.mul(dt));

    float x = position.x + velocity.x * dt;
    float y = position.y + velocity.y * dt;

    position.set(x, y);
  }

  private Vector2 getVectorToTarget() {
    Vector2 toTarget = targetPosition.cpy();
    toTarget.sub(getPosition());
    return toTarget;
  }
}

Java Source Code List