import java.awt.*;
import java.util.LinkedList;

public class Enemy1 extends MovingObject {
	
	public int dy = 0; //hastighet i x-led
	public int dx = 0; //hastighet i y-led
	public double speed = 8.0; //šnskad fšrflyttningshastighet
	public Point visitPoint1 = new Point();
	public Point visitPoint2 = new Point();
	public Point visitPoint3 = new Point();
	public Point visitPoint4 = new Point();
	public LinkedList points = new LinkedList();
	public double distanceVectorX; //Vektorn mellan šnskad punkt och nuvarande (X)
	public double distanceVectorY; //Vektorn mellan šnskad punkt och nuvarande (Y)
	public double normDistX; //normaliserade vektorn
	public double normDistY; //normaliserade vektorn
	public Point tempPoint = new Point(); //TemporŠr punkt
	
	public Enemy1() {
		//skapar ett kolissions-polygon
		this.polygon.addPoint(x, y);
		this.polygon.addPoint(x, y + height);
		this.polygon.addPoint(x + width, y + height);
		this.polygon.addPoint(x + width, y);
		
		visitPoint1.x = 0;
		visitPoint1.y = 300;
		visitPoint2.x = 100;
		visitPoint2.y = 120;
		visitPoint3.x = 400;
		visitPoint3.y = 600;
				
		points.add(visitPoint1);
		points.add(visitPoint2);
		points.add(visitPoint3);
		points.add(visitPoint4);	
	}
	
	public void draw(Graphics g) {
		g.setColor(Color.BLACK);
		g.fillRect(x, y, width, height); //Ritar ut objektet i vald fŠrg
		//g.setColor(Color.PINK);
		//g.drawPolygon(polygon);
	}
	
	public void setdxdy() {
		tempPoint = (Point) points.element(); //tempPoint  <- Fšrsta punkten pŒ listan
		distanceVectorX = tempPoint.x - this.x; //RŠknar ut vektorn mellan šnskad punkt och nuvarande (X)
		distanceVectorY = tempPoint.y - this.y; //RŠknar ut vektorn mellan šnskad punkt och nuvarande (Y)
		normDistX = distanceVectorX / (Math.sqrt((double) (Math.pow(distanceVectorX, 2) + Math.pow(distanceVectorY, 2)))); //Normaliserar vektorn (X)
		normDistY = distanceVectorY / (Math.sqrt((double) (Math.pow(distanceVectorX, 2) + Math.pow(distanceVectorY, 2)))); //Normaliserar vektorn (Y)
		
		if (speed <= (Math.sqrt(Math.pow(distanceVectorX, 2) + Math.pow(distanceVectorY, 2)))) { //kollar om absolutbeloppet av vektorn Šr mindre Šn hastigheten
			dx = (int) (speed * normDistX); //SŠtter dx till hastigheten i x-led utifrŒn vektorns riktining
			dy = (int) (speed * normDistY); //SŠtter dy till hastigheten i y-led utifrŒn vektorns riktning
		}
		else {
			//SlŠnger den fšrsta punkten sist pŒ listan
			tempPoint = (Point) points.remove();
			points.add(tempPoint);
		}
	}
	
	public void clockTick() {
		setdxdy(); //AnvŠnder metoden setdxdy() fšr att bestŠmma hastigheten
		this.y += dy; //fšrflyttar objektet i y-ledd
		this.x += dx; //fšrflyttar objektet i x-ledd
		
		//Fšrflyttar Šven objektets kollissionspolygon
		Polygon polly = new Polygon();
		polly.addPoint(x, y);
		polly.addPoint(x, y + height);
		polly.addPoint(x + width, y + height);
		polly.addPoint(x + width, y);
		this.polygon = polly;
	}	
}