de.r2soft.empires.client.graphics.R2Overlay.java Source code

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Here is the source code for de.r2soft.empires.client.graphics.R2Overlay.java

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/* #########################################################################
 * Copyright (c) 2014 Random Robot Softworks
 * 
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 * 
 ######################################################################### */

package de.r2soft.empires.client.graphics;

import org.apache.log4j.Logger;

import com.badlogic.gdx.Gdx;
import com.badlogic.gdx.graphics.Color;
import com.badlogic.gdx.graphics.GL30;
import com.badlogic.gdx.graphics.OrthographicCamera;
import com.badlogic.gdx.graphics.glutils.ShapeRenderer;
import com.badlogic.gdx.graphics.glutils.ShapeRenderer.ShapeType;
import com.badlogic.gdx.math.Vector2;
import com.badlogic.gdx.scenes.scene2d.Stage;

/**
 * An overlay to be placed over the screen stack of a game. Will handle camera and stage logic in this class. Sub-actors
 * will need to be added via protected getter for {@link #stage}
 * 
 * @author Katharina <katharina.sabel@2rsoftworks.de>
 * 
 */
public abstract class R2Overlay extends R2Screen {
    private ShapeRenderer renderer;
    private OrthographicCamera camera;
    private final Logger log = Logger.getLogger(getClass().getSimpleName());

    /** Additional overlay settings */
    private boolean overlay;
    private Vector2 start, size;
    private float alpha;
    private Color color;

    /** Stage to handle all UI items for an overlay in the stack */
    protected Stage stage;

    public R2Overlay(Stage stage) {
        this.stage = stage;
        renderer = new ShapeRenderer();
        this.camera = (OrthographicCamera) stage.getCamera();
    }

    public void addAdditionalAlpha(Vector2 start, Vector2 size, float alpha) {
        overlay = true;
        this.start = start;
        this.size = size;
        this.alpha = alpha;
        this.color = Color.BLACK;
    }

    public void addAdditionalAlpha(Vector2 start, Vector2 size, float alpha, Color color) {
        overlay = true;
        this.start = start;
        this.size = size;
        this.alpha = alpha;
        this.color = color;
    }

    public void disableAdditionalAlpha() {
        overlay = false;
    }

    @Override
    public void render(float delta) {
        Gdx.gl20.glEnable(GL30.GL_BLEND);
        renderer.setProjectionMatrix(camera.combined);
        renderer.begin(ShapeType.Filled);
        renderer.setColor(0, 0, 0, 0.5f);
        renderer.rect(0, 0, Gdx.graphics.getWidth(), Gdx.graphics.getHeight());
        renderer.end();

        if (overlay) {
            renderer.begin(ShapeType.Filled);
            renderer.setColor(color.r, color.g, color.b, alpha);
            renderer.rect(start.x, start.y, size.x, size.y);
            renderer.end();
        }

        stage.draw();
    }

    @Override
    public void resize(int width, int height) {
        if (stage != null)
            stage.getViewport().update(width, height);
    }

    @Override
    public void show() {
        this.build();
    }

    @Override
    public void hide() {

    }

    @Override
    public void pause() {

    }

    @Override
    public void resume() {

    }

    @Override
    public void dispose() {
        stage.dispose();
    }

    protected Stage getStage() {
        return stage;
    }

    protected void setStage(Stage stage) {
        this.stage = stage;
        log.info("Stage was changed. Did you really want to do that?");
    }

    /**
     * This method can be called instead of show to build an interface. It's the first call in the show() method. It's
     * considered good Practice to ONLY override this method for building!
     */
    public void build() {

    }

}