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Java 2D Game Framework inspired on the popular XNA framework.

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/*
 * This software is available under Apache License
 * Copyright (c) 2020
 */

package org.pixel.commons;

public class DeltaTime {

    private long lastTimestamp;
    private long elapsedMilliseconds;
    private float elapsedSeconds;

    /**
     * Constructor
     */
    public DeltaTime() {
        this.lastTimestamp = System.nanoTime() / 1000000;
    }

    /**
     * Get the elapsed time in seconds
     *
     * @return seconds
     */
    public float getElapsed() {
        return elapsedSeconds;
    }

    /**
     * Get the elapsed time in milliseconds
     *
     * @return milliseconds
     */
    public long getElapsedMs() {
        return elapsedMilliseconds;
    }

    /**
     * Update elapsed time (calculates delta since last tick)
     */
    public void tick() {
        long now = System.nanoTime() / 1000000;
        elapsedMilliseconds = now - lastTimestamp;
        elapsedSeconds = elapsedMilliseconds / 1000f;
        lastTimestamp = now;
    }

}