Android Open Source - Save-the-Planet Obstacle Manager

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License

The source code is released under:

Copyright (c) 2002 JSON.org 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 Software ...

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Java Source Code

package com.karolmajta.stp.models;
/*  w w w .  j a  v  a 2  s . c  o  m*/
import java.util.ArrayList;
import java.util.Random;

public class ObstacleManager extends Tickable  {
  private ArrayList<MainMenuObstacleBall> obstacles;
  
  private float x;
  private float y;
  private float w;
  private float h;

  private long offset;
  
  public ObstacleManager(float x, float y, float w, float h) {
    obstacles = new ArrayList<MainMenuObstacleBall>();
    offset = 0;
    this.x = x;
    this.y = y;
    this.w = w;
    this.h = h;
  }
  
  public ArrayList<MainMenuObstacleBall> getObstacles() {
    return obstacles;
  }
  
  public void cleanup() {
    // check balls above line y = 0. If vy<0 it means this ball
    // has left the space - remove it.
    for(int i = 0; i < obstacles.size(); i++) {
      if(obstacles.get(i).getY() < 0 && obstacles.get(i).getVY() < 0){
        obstacles.remove(i);
      }
    }
    // check balls below line y = h. If vy>0 it means this ball
    // has left the space - remove it.
    for(int i = 0; i < obstacles.size(); i++) {
      if(obstacles.get(i).getY() > h && obstacles.get(i).getVY() > 0){
        obstacles.remove(i);
      }
    }
    // check balls before line x = 0. If vx<0 it means this ball
    // has left the space - remove it.
    for(int i = 0; i < obstacles.size(); i++) {
      if(obstacles.get(i).getX() < 0 && obstacles.get(i).getVX() < 0){
        obstacles.remove(i);
      }
    }
    // check balls after line x = w. If vx>0 it means this ball
    // has left the space - remove it.
    for(int i = 0; i < obstacles.size(); i++) {
      if(obstacles.get(i).getX() > w && obstacles.get(i).getVX() > 0){
        obstacles.remove(i);
      }
    }
  }
  
  public void addBall() {
    Random r = new Random();
    // choose side of screen to spawn ball
    int side = r.nextInt(4);
    float minX = 0;
    float minY = 0;
    float maxX = 0;
    float maxY = 0;
    switch(side){
      case 0:
        // left
        minX = -50;
        maxX = 0;
        minY = 0;
        maxY = h;
        break;
      case 1:
        // top
        minX = 0;
        maxX = w;
        minY = -50;
        maxY = 0;
        break;
      case 2:
        // right
        minX = w;
        maxX = w+50;
        minY = 0;
        maxY = h;
        break;
      case 3:
        // bottom
        minX = 0;
        maxX = w;
        minY = h;
        maxY = h+50;
        break;
    }
    float x = minX + r.nextInt((int)(maxX-minX));
    float y = minY + r.nextInt((int)(maxY-minY));
    
    float rx = w/2 - x;
    float ry = h/2 - y;
    
    float vx = rx;
    float vy = ry;
    
    float normV = (float)Math.sqrt(vx*vx+vy*vy);
    vx /= normV*3;
    vy /= normV*3;
    
    MainMenuObstacleBall b = new MainMenuObstacleBall
        (
            x,
            y,
            w/20,
            vx,
            vy,
            100
        );
    obstacles.add(b);
  }

  @Override
  protected void onTick(long dt) {
    offset += dt;
    if(offset > 1000) {
      offset = 0;
      addBall();
    }
  }
}

Java Source Code List