Contents

package com.game_machine.core;

import java.util.concurrent.ConcurrentHashMap;

import GameMachine.Messages.TrackData;

public class DefaultMovementVerifier implements MovementVerifier {

	private ConcurrentHashMap<String, TrackData> trackdatas = new ConcurrentHashMap<String, TrackData>();
	private ConcurrentHashMap<String, Long> lastUpdates = new ConcurrentHashMap<String, Long>();
	private double maxUnitsPerSecond;
	
	private double distance(float px, float py, float x, float y) {
		return Math.sqrt(Math.pow(x - px, 2) + Math.pow(y - py, 2));
	}
	
	public DefaultMovementVerifier(double maxUnitsPerSecond) {
		this.maxUnitsPerSecond = maxUnitsPerSecond;
	}
	
	@Override
	public boolean verify(TrackData trackData) {
		if (!trackdatas.containsKey(trackData.id)) {
			trackdatas.put(trackData.id, trackData);
			lastUpdates.put(trackData.id, System.currentTimeMillis());
			return true;
		}
		
		// verify once per second, every update is a waste of cpu
		Long lastUpdate = lastUpdates.get(trackData.id);
		double seconds = (System.currentTimeMillis() - lastUpdate) / 1000;
		if (seconds >= 1.0) {
			TrackData previous = trackdatas.get(trackData.id);
			
			// check distance traveled over time (basic speed hack prevention)
			double distance = distance(previous.x,previous.y,trackData.x,trackData.y);
			double unitsPerSecond = distance / seconds;
			if (unitsPerSecond > maxUnitsPerSecond) {
				return false;
			}
			
			// TODO check valid movement.
			// using pathfinding, pre calculate every possible move and save it somewhere.
			// At startup load the data and use it to check for valid movement.  Can also modify it
			// at runtime if needed.
			
			// In addition, check for other objects that occupy the coordinates the player is trying to move to, and
			// deny if they are occupied.  Need to look at most cost effective way to do this.
			
			trackdatas.put(trackData.id, trackData);
			lastUpdates.put(trackData.id, System.currentTimeMillis());
		}
		return true;
	}

}

Version data entries

2 entries across 2 versions & 1 rubygems

Version	Path
game_machine-1.0.4	java/project/src/main/java/com/game_machine/core/DefaultMovementVerifier.java
game_machine-1.0.2	java/project/src/main/java/com/game_machine/core/DefaultMovementVerifier.java