de.invation.code.toval.graphic.misc.RegularPolygon Maven / Gradle / Ivy

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package de.invation.code.toval.graphic.misc;

import java.awt.Point;
import java.awt.Polygon;
import java.util.ArrayList;
import java.util.List;

import de.invation.code.toval.validate.ParameterException;
import de.invation.code.toval.validate.Validate;

/**
 * This class stands for a circle that maintains a number of points that are positioned on the circle line with equal distance.
 */
public class RegularPolygon {

	/**
	 * The radius of the circle that is used for placement.
	 */
	protected double radius;
	/**
	 * The number of points.
	 */
	protected int numPoints;
	protected Point origin = new Point(0,0);
	/**
	 * The coordinates on the circular line that are used to place points.
	 */
	protected List coordinates = null;

	/**
	 * Creates a new PointCircle with the given order.
	 * @throws ParameterException 
	 */
	public RegularPolygon(int radius, int numPoints) throws ParameterException{
		Validate.positive(radius);
		Validate.positive(numPoints);
		Validate.bigger(numPoints, 2);
		
		this.radius = radius;
		this.numPoints = numPoints;
		coordinates = new ArrayList(numPoints);
		for(int i=0; i getCoordinates() {
		determineCoordinates();
		return coordinates;
	}
	
	public Polygon getPolygon(){
		Polygon result = new Polygon();
		for(Position coordinate: coordinates){
			result.addPoint(coordinate.getX(), coordinate.getY());
		}
		return result;
	}
	
	public Point getOrigin(){
		return new Point((int) origin.getX(), (int) origin.getY());
	}
	
	public double getArea(){
		getCoordinates();
		int oldOriginX = (int) origin.getX();
		int oldOriginY = (int) origin.getY();
		boolean resetNecessary = pushIntoFirstQuadrant();
		int sum = 0;
		int index = 0;
		int nextIndex = 0;
		for(int i=0; i