com.bladecoder.engine.ui.LoadingScreen.java Source code

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Here is the source code for com.bladecoder.engine.ui.LoadingScreen.java

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/*******************************************************************************
 * Copyright 2014 Rafael Garcia Moreno.
 *
 * 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.bladecoder.engine.ui;

import com.badlogic.gdx.Gdx;
import com.badlogic.gdx.ScreenAdapter;
import com.badlogic.gdx.graphics.Color;
import com.badlogic.gdx.graphics.GL20;
import com.badlogic.gdx.graphics.g2d.SpriteBatch;
import com.badlogic.gdx.utils.viewport.ScreenViewport;
import com.badlogic.gdx.utils.viewport.Viewport;
import com.bladecoder.engine.assets.EngineAssetManager;
import com.bladecoder.engine.ui.UI.Screens;
import com.bladecoder.engine.util.RectangleRenderer;

public class LoadingScreen extends ScreenAdapter implements BladeScreen {
    private final static float INIT_TIME_SEG = 1f;
    private final static float WAIT_TIME_MS = 100f;

    private int pos = 0;
    private int numSquares = 3;

    private float x, y;

    private float squareWidth = 30f;
    private float squareHeight = 30f;
    private float margin = 10f;

    private float initTime = 100;

    private float delta = 0;

    private UI ui;

    private final Viewport viewport = new ScreenViewport();

    private boolean wait = true;

    @Override
    public void render(float delta) {

        // Try to load scene for WAIT_TIME_MS before continue. If not loaded in
        // this time,
        // show the loading screen
        if (wait) {
            float t0 = System.currentTimeMillis();
            float t = 0f;
            while (EngineAssetManager.getInstance().isLoading() && t - t0 < WAIT_TIME_MS) {
                t = System.currentTimeMillis();
            }
        }

        if (!EngineAssetManager.getInstance().isLoading()) {
            ui.setCurrentScreen(Screens.SCENE_SCREEN);
            return;
        }

        Gdx.gl.glClearColor(0, 0, 0, 1);
        Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT);

        // Only show the squares when time > INIT_TIME
        if (initTime < INIT_TIME_SEG) {
            initTime += delta;
            return;
        }

        final SpriteBatch batch = ui.getBatch();

        batch.setProjectionMatrix(viewport.getCamera().combined);
        batch.begin();

        update(delta);

        for (int i = 0; i < numSquares; i++) {
            final Color color = i == pos ? Color.WHITE : Color.GRAY;
            RectangleRenderer.draw(ui.getBatch(), x + i * (squareWidth + margin), y, squareWidth, squareHeight,
                    color);
        }
        batch.end();
    }

    private void update(float d) {
        delta += d;

        if (delta > 0.4) {
            pos = (pos + 1) % numSquares;
            delta = 0;
        }
    }

    @Override
    public void resize(int width, int height) {
        viewport.update(width, height, true);

        x = (viewport.getWorldWidth() - (squareWidth * numSquares + margin * (numSquares - 1))) / 2;
        y = (viewport.getWorldHeight() - squareHeight) / 2;
    }

    @Override
    public void show() {
        Gdx.input.setInputProcessor(null);
        initTime = 0;
        delta = 0;
        wait = true;
    }

    @Override
    public void setUI(UI ui) {
        this.ui = ui;
    }
}