com.anhld.object.AbstractGameObject.java Source code

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Here is the source code for com.anhld.object.AbstractGameObject.java

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/*******************************************************************************
 * Copyright 2013 Andreas Oehlke
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *   http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 ******************************************************************************/

package com.anhld.object;

import com.badlogic.gdx.Gdx;
import com.badlogic.gdx.InputAdapter;
import com.badlogic.gdx.graphics.g2d.SpriteBatch;
import com.badlogic.gdx.math.MathUtils;
import com.badlogic.gdx.math.Rectangle;
import com.badlogic.gdx.math.Vector2;
import com.badlogic.gdx.scenes.scene2d.Actor;

public abstract class AbstractGameObject {

    public Vector2 position;
    public Vector2 dimension;
    public Vector2 origin;
    public Vector2 scale;
    public float rotation;
    public Vector2 velocity;
    public Vector2 terminalVelocity;
    public Vector2 friction;
    public Vector2 acceleration;
    public Rectangle bounds;

    public AbstractGameObject() {
        position = new Vector2();
        dimension = new Vector2(1, 1);
        origin = new Vector2();
        scale = new Vector2(1, 1);
        rotation = 0;
        velocity = new Vector2();
        terminalVelocity = new Vector2(1, 1);
        friction = new Vector2();
        acceleration = new Vector2();
        bounds = new Rectangle();
    }

    public void update(float deltaTime) {
        updateMotionX(deltaTime);
        updateMotionY(deltaTime);

        // Move to new position
        position.x += velocity.x * deltaTime;
        position.y += velocity.y * deltaTime;
    }

    protected void updateMotionX(float deltaTime) {
        if (velocity.x != 0) {
            // Apply friction
            if (velocity.x > 0) {
                velocity.x = Math.max(velocity.x - friction.x * deltaTime, 0);
            } else {
                velocity.x = Math.min(velocity.x + friction.x * deltaTime, 0);
            }
        }
        // Apply acceleration
        velocity.x += acceleration.x * deltaTime;
        // Make sure the object's velocity does not exceed the
        // positive or negative terminal velocity
        velocity.x = MathUtils.clamp(velocity.x, -terminalVelocity.x, terminalVelocity.x);
    }

    protected void updateMotionY(float deltaTime) {
        if (velocity.y != 0) {
            // Apply friction
            if (velocity.y > 0) {
                velocity.y = Math.max(velocity.y - friction.y * deltaTime, 0);
            } else {
                velocity.y = Math.min(velocity.y + friction.y * deltaTime, 0);
            }
        }
        // Apply acceleration
        velocity.y += acceleration.y * deltaTime;
        // Make sure the object's velocity does not exceed the
        // positive or negative terminal velocity
        velocity.y = MathUtils.clamp(velocity.y, -terminalVelocity.y, terminalVelocity.y);
    }

    public void updateVelocity(Vector2 velocity, Vector2 terminalVelocity) {
        this.velocity = velocity;
        this.terminalVelocity = terminalVelocity;
    }

    public abstract void render(SpriteBatch batch);

}