Hello Moving World

From Victory Engine

This is an extended version of Hello World. In this version, the GameLoop is introduced and used to animate the world.
package org.victoryengine.tutorials.helloworld;

import org.victoryengine.core.AbstractEntity;
import org.victoryengine.core.EntityList;
import org.victoryengine.core.GameLoop;
import org.victoryengine.geom.Point;
import org.victoryengine.graphics2d.Colour;
import org.victoryengine.graphics2d.Display2D;
import org.victoryengine.graphics2d.DisplayListener;
import org.victoryengine.graphics2d.Drawable;
import org.victoryengine.graphics2d.GC;
import org.victoryengine.graphics2d.Image;
import org.victoryengine.graphics2d.j2d.JDisplay;
import org.victoryengine.graphics2d.j2d.JDisplayParameters;

/**
 * Simple game which loads an image of the world and displays it.
 * Example of the Victory Engine.
 * @author Bart van Heukelom
 */
public class HelloMovingWorldGame extends AbstractEntity implements Drawable, DisplayListener {
    
    private Image world;
    private Display2D display;
    private Point pos = new Point();

    public static void main(String[] args) {
        new HelloMovingWorldGame().start();
    }
    
    /**
     * Set up the display.
     */
    public HelloMovingWorldGame() {

        // set up a 2d window of 300 x 300 pixels
        display = new JDisplay(new JDisplayParameters(300, 300));
        display.setBackgroundColour(Colour.BLACK);
        display.setWindowTitle("Hello Moving World");
        
        // set this as listener, so the game can be exited
        // when the window is closed. see windowClosed()
        display.addListener(this);
        
        // add this to the drawing loop, to draw the world
        // see draw()
        display.addDrawable(this);
        
        // load a 150x150 image of the world
        // which is placed directly in the classpath
        world = display.getImageIO().loadImage(
                ClassLoader.getSystemResource("world.png")
        );
        
        // add this to the entity list
        // so step() will be executed every game step
        EntityList.add(this);
        
    }

    /**
     * Start the display and game loop.
     */
    public void start() {
        display.start();
        GameLoop.get().start();
    }
    
    @Override
    public void step() {
        final double step = GameLoop.get().getStep() * 0.25;
        pos.set(
                75 + Math.cos(step) * 40,
                75 + Math.sin(step) * 40
        );
    }

    /**
     * Draw the earth.
     */
    public void draw(GC context) {
        context.drawImage(world, pos);
    }

    /**
     * Exit the game when the window is closed.
     */
    public void windowClosed() {
        System.exit(0);
    }
    
    public void frameStart(GC context) {
        // not used, but neccessary to implement DisplayListener
    }

    public double getDepth() {
        // not used, part of Drawable
        return 0;
    }

    public void setDepth(double depth) {
        // not used, part of Drawable
    }

}
Hello Moving World

From Victory Engine

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