com.anhld.util.CameraHelper.java Source code

Introduction

Here is the source code for com.anhld.util.CameraHelper.java

Source

/*******************************************************************************
 * 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.util;

import com.anhld.object.AbstractGameObject;
import com.badlogic.gdx.graphics.OrthographicCamera;
import com.badlogic.gdx.math.MathUtils;
import com.badlogic.gdx.math.Vector2;

public class CameraHelper {

    private static final String TAG = CameraHelper.class.getName();

    private final float MAX_ZOOM_IN = 0.25f;
    private final float MAX_ZOOM_OUT = 10.0f;
    private final float FOLLOW_SPEED = 4.0f;

    private Vector2 position;
    private float zoom;
    private AbstractGameObject target;

    public CameraHelper() {
        position = new Vector2();
        zoom = 1.0f;
    }

    public void update(float deltaTime) {
        if (!hasTarget())
            return;

        position.lerp(target.position, FOLLOW_SPEED * deltaTime);

        // Prevent camera from moving down too far
        position.y = Math.max(-1f, position.y);
    }

    public void setPosition(float x, float y) {
        this.position.set(x, y);
    }

    public Vector2 getPosition() {
        return position;
    }

    public void addZoom(float amount) {
        setZoom(zoom + amount);
    }

    public void setZoom(float zoom) {
        this.zoom = MathUtils.clamp(zoom, MAX_ZOOM_IN, MAX_ZOOM_OUT);
    }

    public float getZoom() {
        return zoom;
    }

    public void setTarget(AbstractGameObject target) {
        this.target = target;
    }

    public AbstractGameObject getTarget() {
        return target;
    }

    public boolean hasTarget() {
        return target != null;
    }

    public boolean hasTarget(AbstractGameObject target) {
        return hasTarget() && this.target.equals(target);
    }

    public void applyTo(OrthographicCamera camera) {
        camera.position.x = position.x;
        camera.position.y = position.y;
        camera.zoom = zoom;
        camera.update();
    }

}