Java tutorial
/******************************************************************************* * 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 java.io.BufferedReader; import java.text.MessageFormat; import java.util.ArrayList; import java.util.HashMap; import java.util.List; import java.util.Locale; import java.util.Map; import com.badlogic.gdx.Gdx; import com.badlogic.gdx.Input; import com.badlogic.gdx.InputAdapter; import com.badlogic.gdx.InputProcessor; import com.badlogic.gdx.ScreenAdapter; import com.badlogic.gdx.audio.Music; import com.badlogic.gdx.graphics.Color; import com.badlogic.gdx.graphics.GL20; import com.badlogic.gdx.graphics.Texture; import com.badlogic.gdx.graphics.Texture.TextureFilter; import com.badlogic.gdx.graphics.g2d.BitmapFont; import com.badlogic.gdx.graphics.g2d.GlyphLayout; import com.badlogic.gdx.graphics.g2d.SpriteBatch; import com.badlogic.gdx.scenes.scene2d.utils.Drawable; import com.badlogic.gdx.utils.Align; 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.DPIUtils; import com.bladecoder.engine.util.EngineLogger; public class CreditsScreen extends ScreenAdapter implements BladeScreen { private static final String CREDITS_FILENAME = "ui/credits"; private static final float SPEED = 10 * DPIUtils.getSpacing(); // px/sec. // title and texts pair sequence private final List<String> credits = new ArrayList<>(); private CreditScreenStyle style; private int stringHead = 0; private float scrollY = 0; private UI ui; private Music music; private final Map<String, Texture> images = new HashMap<>(); private Viewport viewport; private final GlyphLayout layout = new GlyphLayout(); private final InputProcessor inputProcessor = new InputAdapter() { @Override public boolean keyUp(int keycode) { if (keycode == Input.Keys.ESCAPE || keycode == Input.Keys.BACK) ui.setCurrentScreen(Screens.MENU_SCREEN); // FIXME: This should probably return true when we process ESCAPE or BACK? return false; } @Override public boolean touchUp(int screenX, int screenY, int pointer, int button) { ui.setCurrentScreen(Screens.MENU_SCREEN); return true; } }; @Override public void render(float delta) { final SpriteBatch batch = ui.getBatch(); final int width = (int) viewport.getWorldWidth(); final int height = (int) viewport.getWorldHeight(); Gdx.gl.glClearColor(0, 0, 0, 1); Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT); batch.setProjectionMatrix(viewport.getCamera().combined); batch.begin(); if (style.background != null) { style.background.draw(batch, 0, 0, width, height); } scrollY += delta * SPEED * EngineAssetManager.getInstance().getScale(); float y = scrollY; if (stringHead >= credits.size()) ui.setCurrentScreen(Screens.MENU_SCREEN); for (int i = stringHead; i < credits.size(); i++) { String s = credits.get(i); char type = 'c'; // types are 'c' -> credit, 't' -> title, 'i' -> image, 's' -> space, 'm' -> music if (s.indexOf('#') != -1) { type = s.charAt(0); s = s.substring(2); } switch (type) { case 't': y = processCreditTitle(batch, width, height, y, i, s); break; case 'i': y = processCreditImage(batch, width, height, y, i, s); break; case 's': y = processCreditSpace(height, y, i, s); break; case 'm': processCreditMusic(s); break; default: y = processCreditDefault(batch, width, height, y, i, s); break; } if (y < 0) { break; } } batch.end(); } private float processCreditTitle(SpriteBatch batch, int width, int height, float y, int i, String s) { final float lineHeight = style.titleFont.getLineHeight(); y -= lineHeight * 2; drawCenteredScreenX(batch, style.titleFont, s, y, width); y -= lineHeight; if (y > height + lineHeight) { stringHead = i + 1; scrollY -= lineHeight; scrollY -= lineHeight * 2; } return y; } private float processCreditImage(SpriteBatch batch, int width, int height, float y, int i, String s) { Texture img = images.get(s); final int lineHeight = img.getHeight(); batch.draw(img, (width - img.getWidth()) / 2, y - lineHeight); y -= lineHeight; if (y > height) { stringHead = i + 1; scrollY -= lineHeight; } return y; } private float processCreditSpace(int height, float y, int i, String s) { int lineHeight = (int) (Integer.valueOf(s) * EngineAssetManager.getInstance().getScale()); y -= lineHeight; if (y > height) { stringHead = i + 1; scrollY -= lineHeight; } return y; } private void processCreditMusic(String s) { if (music != null) music.dispose(); music = Gdx.audio.newMusic(EngineAssetManager.getInstance().getAsset("music/" + s)); music.play(); } private float processCreditDefault(SpriteBatch batch, int width, int height, float y, int i, String s) { drawCenteredScreenX(batch, style.font, s, y, width); final float lineHeight = style.font.getLineHeight(); y -= lineHeight; if (y > height + lineHeight) { stringHead = i + 1; scrollY -= lineHeight; } return y; } @Override public void resize(int width, int height) { viewport.update(width, height, true); } @Override public void dispose() { for (Texture t : images.values()) t.dispose(); images.clear(); credits.clear(); if (music != null) { music.stop(); music.dispose(); } } private void retrieveAssets() { style = ui.getSkin().get(CreditScreenStyle.class); final Locale locale = Locale.getDefault(); String localeFilename = MessageFormat.format("{0}_{1}.txt", CREDITS_FILENAME, locale.getLanguage()); if (!EngineAssetManager.getInstance().assetExists(localeFilename)) localeFilename = MessageFormat.format("{0}.txt", CREDITS_FILENAME); BufferedReader reader = EngineAssetManager.getInstance().getAsset(localeFilename).reader(4096, "utf-8"); try { String line; while ((line = reader.readLine()) != null) { credits.add(line); } } catch (Exception e) { EngineLogger.error(e.getMessage()); ui.setCurrentScreen(Screens.MENU_SCREEN); } scrollY += style.titleFont.getLineHeight(); // Load IMAGES for (String s : credits) { if (s.indexOf('#') != -1 && s.charAt(0) == 'i') { s = s.substring(2); Texture tex = new Texture(EngineAssetManager.getInstance().getResAsset("ui/" + s)); tex.setFilter(TextureFilter.Linear, TextureFilter.Linear); images.put(s, tex); } } } @Override public void show() { retrieveAssets(); Gdx.input.setInputProcessor(inputProcessor); // int wWidth = EngineAssetManager.getInstance().getResolution().portraitWidth; // int wHeight = EngineAssetManager.getInstance().getResolution().portraitHeight; // viewport = new ExtendViewport(wWidth, wHeight); viewport = new ScreenViewport(); stringHead = 0; scrollY = 0; } @Override public void hide() { dispose(); } @Override public void setUI(UI ui) { this.ui = ui; } public void drawCenteredScreenX(SpriteBatch batch, BitmapFont font, CharSequence str, float y, int viewportWidth) { float x = 0; layout.setText(font, str, Color.WHITE, viewportWidth, Align.center, true); //x = (viewportWidth - layout.width)/2; font.draw(batch, layout, x, y); } /** * The style for the CreditsScreen */ public static class CreditScreenStyle { /** * Optional. */ public Drawable background; /** * if 'bg' not specified try to load the bgFile */ public String bgFile; public BitmapFont titleFont; public BitmapFont font; public CreditScreenStyle() { } public CreditScreenStyle(CreditScreenStyle style) { background = style.background; bgFile = style.bgFile; titleFont = style.titleFont; font = style.font; } } }