com.hajnar.GravityShip.GameObjects.GameCamera.java Source code

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Here is the source code for com.hajnar.GravityShip.GameObjects.GameCamera.java

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/*******************************************************************************
 * Copyright 2013 Jn Hajnr.
 *
 * 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.hajnar.GravityShip.GameObjects;

import com.badlogic.gdx.graphics.OrthographicCamera;
import com.badlogic.gdx.math.Vector2;
import com.hajnar.GravityShip.Helper;

public class GameCamera extends OrthographicCamera {

    private float playerVelocityBefore; //toto je pre metodu followWithZoom lebo neviem zistit akceleraciu telesa
    private Vector2 cameraTranslation;
    private Vector2 offset;

    public GameCamera(float width, float height) {
        super(width, height);
        this.playerVelocityBefore = 0;
        this.offset = new Vector2();
        this.cameraTranslation = new Vector2();
    }

    public Vector2 follow(Player player) {
        Vector2 playerVelocity = player.getBody().getLinearVelocity();
        offset.add(-offset.x / 20f, -offset.y / 20f);
        offset.add(playerVelocity.mul(1.2f));
        if (offset.x > 200)
            offset.x = 200;
        else if (offset.x < -200)
            offset.x = -200;
        if (offset.y > 150)
            offset.y = 150;
        else if (offset.y < -150)
            offset.y = -150;
        cameraTranslation.set(player.getBody().getPosition().mul(Helper.BOX_TO_WORLD).sub(position.x - offset.x,
                position.y - offset.y));
        translate(cameraTranslation);
        return cameraTranslation;
    }

    public Vector2 followWithZooming(Player player, float delta) {
        Vector2 playerVelocity = player.getBody().getLinearVelocity();
        float playerVelocityLen = playerVelocity.len();
        offset.add(-offset.x / 20f, -offset.y / 20f);
        offset.add(playerVelocity.mul(1.2f));
        if (offset.x > 200)
            offset.x = 200;
        else if (offset.x < -200)
            offset.x = -200;
        if (offset.y > 150)
            offset.y = 150;
        else if (offset.y < -150)
            offset.y = -150;
        cameraTranslation.set(player.getBody().getPosition().mul(Helper.BOX_TO_WORLD).sub(position.x - offset.x,
                position.y - offset.y));
        translate(cameraTranslation);
        if (playerVelocityLen < 20)
            if (playerVelocityBefore < playerVelocityLen && playerVelocityLen > 2)
                changeZoom(0.27f * delta);
            else
                changeZoom(-0.27f * delta);
        playerVelocityBefore = playerVelocityLen;
        return cameraTranslation;

    }

    public void changeZoom(float value) {
        if (zoom + value > 1.5)
            zoom = 1.5f;
        else if (zoom + value < 1)
            zoom = 1;
        else
            zoom += value;
    }
}