/*******************************************************************************
 * Copyright 2011 See AUTHORS file.
 *
 * 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 squidpony.squidgrid.gui.gdx;

import com.badlogic.gdx.graphics.Camera;
import com.badlogic.gdx.graphics.OrthographicCamera;
import com.badlogic.gdx.math.Vector2;
import com.badlogic.gdx.utils.Scaling;
import com.badlogic.gdx.utils.viewport.ScalingViewport;

/** A viewport that scales the world using {@link Scaling#stretch} on a sub-region of the screen.
 * Does not keep the aspect ratio, the world is scaled to take up the requested region of the screen.
 * @author Daniel Holderbaum
 * @author Nathan Sweet
 * Created by Tommy Ettinger on 4/16/2016.
 */
public class ShrinkPartViewport extends ScalingViewport {
    public float barWidth, barHeight;
    /** Creates a new viewport using a new {@link OrthographicCamera}. */
    public ShrinkPartViewport (float worldWidth, float worldHeight, float barWidth) {
        this(worldWidth, worldHeight, barWidth, new OrthographicCamera());
    }
    public ShrinkPartViewport (float worldWidth, float worldHeight, float barWidth, float barHeight) {
        this(worldWidth, worldHeight, barWidth, barHeight, new OrthographicCamera());
    }

    public ShrinkPartViewport (float worldWidth, float worldHeight, float barWidth, Camera camera) {
        this(worldWidth, worldHeight, barWidth, 0f, camera);
    }

    public ShrinkPartViewport (float worldWidth, float worldHeight, float barWidth, float barHeight, Camera camera) {
        super(Scaling.stretch, worldWidth, worldHeight, camera);
        this.barWidth = barWidth;
        this.barHeight = barHeight;
    }

    @Override
    public void update (int screenWidth, int screenHeight, boolean centerCamera) {
        Vector2 scaled = Scaling.stretch.apply(getWorldWidth(), getWorldHeight(),
                screenWidth - barWidth * 2, screenHeight - barHeight * 2);
        int viewportWidth = Math.round(scaled.x);
        int viewportHeight = Math.round(scaled.y);
        // Center.
        setScreenBounds((screenWidth - viewportWidth) >> 1, (screenHeight - viewportHeight) >> 1, viewportWidth, viewportHeight);
        apply(true);
    }

    public Scaling getScaling () {
        return Scaling.stretch;
    }
}