import greenfoot.*;  // (World, Actor, GreenfootImage, Greenfoot and MouseInfo)
import java.util.List;
/**
 * Write a description of class ScalingWorld here.
 * 
 * @author (your name) 
 * @version (a version number or a date)
 */
public class ScalingWorld extends World
{
    static int oWidth;
    static int oHeight;
    static int currentWidth;
    static int currentHeight;
    static boolean first = true;
    /**
     * Constructor for objects of class ScalingWorld.
     * 
     */
    public ScalingWorld()
    {    
        // Create a new world with 600x400 cells with a cell size of 1x1 pixels.
        super(600, 400, 1); 
        if(first) {
            first = false;
            oWidth = getWidth();
            oHeight = getHeight();
            addObject(new Apple(),100,100); //for testing
        }
    }

    public void scale(int newWidth,int newHeight) {
        GreenfootImage background = getBackground();
        background.scale(newWidth,newHeight);
        List<Actor> actors = getObjects(null);
        double xChange = newWidth/oWidth;
        double yChange = newHeight/oHeight;
        for(Actor a:actors) {
            scaleActor(a,xChange,yChange);
        }
        ScalingWorld newWorld = new ScalingWorld();
        newWorld.setBackground(background);
        Greenfoot.setWorld(newWorld);
    }

    public void scaleActor(Actor actor, double xChange,double yChange) {
        GreenfootImage image = actor.getImage();
        int newX = (int) (image.getWidth()*xChange);
        int newY = (int) (image.getHeight()*yChange);
        if(newX <= 0) {
            newX = 1;
        }
        if(newY <= 0) {
            newY = 1;
        }
        image.scale(newX,newY);
        actor.setImage(image);
    }

    public void scaleActor(Actor actor, int xPX,int yPX,boolean scaleInPixels) {
        if(scaleInPixels) {
            GreenfootImage image = actor.getImage();
            image.scale(xPX,yPX);
            actor.setImage(image);
        }else {
            scaleActor(actor,xPX,yPX);
        }
    }
}