com.gemserk.libgdx.test.HelloWorld.java Source code

Introduction

Here is the source code for com.gemserk.libgdx.test.HelloWorld.java

Source

/*
 * Copyright 2010 Mario Zechner (contact@badlogicgames.com), Nathan Sweet (admin@esotericsoftware.com)
 * 
 * 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.gemserk.libgdx.test;

import com.badlogic.gdx.ApplicationListener;
import com.badlogic.gdx.Gdx;
import com.badlogic.gdx.graphics.Color;
import com.badlogic.gdx.graphics.GL10;
import com.badlogic.gdx.graphics.Texture;
import com.badlogic.gdx.graphics.g2d.BitmapFont;
import com.badlogic.gdx.graphics.g2d.SpriteBatch;
import com.badlogic.gdx.math.Vector2;

public class HelloWorld implements ApplicationListener {
    SpriteBatch spriteBatch;
    Texture texture;
    BitmapFont font;
    Vector2 textPosition = new Vector2(100, 100);
    Vector2 textDirection = new Vector2(1, 1);

    @Override
    public void create() {
        font = new BitmapFont();
        font.setColor(Color.RED);
        texture = new Texture(Gdx.files.internal("data/badlogic.jpg"));
        spriteBatch = new SpriteBatch();
    }

    @Override
    public void render() {
        int centerX = Gdx.graphics.getWidth() / 2;
        int centerY = Gdx.graphics.getHeight() / 2;

        Gdx.graphics.getGL10().glClear(GL10.GL_COLOR_BUFFER_BIT);

        // more fun but confusing :)
        //textPosition.add(textDirection.tmp().mul(Gdx.graphics.getDeltaTime()).mul(60));
        textPosition.x += textDirection.x * Gdx.graphics.getDeltaTime() * 60;
        textPosition.y += textDirection.y * Gdx.graphics.getDeltaTime() * 60;

        if (textPosition.x < 0) {
            textDirection.x = -textDirection.x;
            textPosition.x = 0;
        }
        if (textPosition.x > Gdx.graphics.getWidth()) {
            textDirection.x = -textDirection.x;
            textPosition.x = Gdx.graphics.getWidth();
        }
        if (textPosition.y < 0) {
            textDirection.y = -textDirection.y;
            textPosition.y = 0;
        }
        if (textPosition.y > Gdx.graphics.getHeight()) {
            textDirection.y = -textDirection.y;
            textPosition.y = Gdx.graphics.getHeight();
        }

        spriteBatch.begin();
        spriteBatch.setColor(Color.WHITE);
        spriteBatch.draw(texture, centerX - texture.getWidth() / 2, centerY - texture.getHeight() / 2, 0, 0,
                texture.getWidth(), texture.getHeight());
        font.draw(spriteBatch, "Hello World!", (int) textPosition.x, (int) textPosition.y);
        spriteBatch.end();
    }

    @Override
    public void resize(int width, int height) {
        spriteBatch.getProjectionMatrix().setToOrtho2D(0, 0, width, height);
        textPosition.set(0, 0);
    }

    @Override
    public void pause() {

    }

    @Override
    public void resume() {

    }

    @Override
    public void dispose() {

    }

}