Android Open Source - BreakoutWallpaper Ball

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From Project

Back to project page BreakoutWallpaper.

License

The source code is released under:

Apache License

Java Source Code

package com.jakewharton.breakoutwallpaper;
/*from  w w w . j a va  2s.c  om*/
import android.util.Log;

/**
 * Represents a single ball on the game board.
 * 
 * @author Jake Wharton
 */
public class Ball {
  /**
   * Tag used for logging.
   */
  private static final String TAG = "BreakoutWallpaper.Ball";
  
  /**
   * Size relative to the smaller of cell width and cell height.
   */
  /*package*/static final float SIZE_PERCENTAGE = 0.75f;
  
  /**
   * Ball radius in a static context.
   */
  /*package*/static float RADIUS = 0;
  
  /**
   * Arbitrary ball speed.
   */
  private static final int SPEED = 10;
  
  
  
  /**
   * X coordinate of on-screen location.
   */
  private float mLocationX;
  
  /**
   * Y coordinate of on-screen location.
   */
  private float mLocationY;
  
  /**
   * X coordinate of per-tick movement vector.
   */
  private float mVectorX;
  
  /**
   * Y coordinate of per-tick movement vector.
   */
  private float mVectorY;
  
  
  
  /**
   * Create a ball.
   */
  public Ball() {
    if (Wallpaper.LOG_VERBOSE) {
      Log.v(Ball.TAG, "> Ball()");
    }
    
    this.mLocationX = 0;
    this.mLocationY = 0;
    this.mVectorX = 0;
    this.mVectorY = 0;

    if (Wallpaper.LOG_VERBOSE) {
      Log.v(Ball.TAG, "< Ball()");
    }
  }
  
  
  
  /**
   * Get X coordinate of on-screen location.
   * 
   * @return Float.
   */
  public float getLocationX() {
    return this.mLocationX;
  }
  
  /**
   * Get Y coordinate of on-screen location.
   * 
   * @return Float.
   */
  public float getLocationY() {
    return this.mLocationY;
  }
  
  /**
   * Set on-screen location.
   * 
   * @param x X coordinate.
   * @param y Y coordinate.
   */
  public void setLocation(final float x, final float y) {
    this.mLocationX = x;
    this.mLocationY = y;
    
    if (Wallpaper.LOG_DEBUG) {
      Log.d(Ball.TAG, "Location: (" + x + ", " + y + ")");
    }
  }
  
  /**
   * Get X coordinate of per-tick movement vector.
   * 
   * @return Float.
   */
  public float getVectorX() {
    return this.mVectorY;
  }
  
  /**
   * Get Y coordinate of per-tick movement vector.
   * 
   * @return Float.
   */
  public float getVectorY() {
    return this.mVectorX;
  }
  
  /**
   * Set per-tick movement vector. This will be normalized and then scaled to speed.
   * 
   * @param x X coordinate.
   * @param y Y coordinate.
   */
  public void setVector(float x, float y) {
    final float length = (float)Math.sqrt(Math.pow(x, 2) + Math.pow(y, 2));
    x /= length;
    y /= length;
    x *= Ball.SPEED;
    y *= Ball.SPEED;
    
    this.mVectorX = x;
    this.mVectorY = y;
  }
  
  /**
   * Iterate the ball one step.
   */
  public void tick() {
    this.mLocationX += this.mVectorX;
    this.mLocationY += this.mVectorY;
  }
}

Java Source Code List

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