com.alma42.mapgen.utils.CameraHelper.java Source code

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Here is the source code for com.alma42.mapgen.utils.CameraHelper.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.alma42.mapgen.utils;

import com.badlogic.gdx.graphics.OrthographicCamera;
import com.badlogic.gdx.graphics.g2d.Sprite;
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 = 1000.0f;

    private final Vector2 position;
    private Sprite target;
    private float zoom;

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

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

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

    public Vector2 getPosition() {
        return this.position;
    }

    public Sprite getTarget() {
        return this.target;
    }

    public float getZoom() {
        return this.zoom;
    }

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

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

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

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

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

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

        this.position.x = this.target.getX() + this.target.getOriginX();
        this.position.y = this.target.getY() + this.target.getOriginY();
    }

}