current

package intersectings;

import java.awt.*;
import java.util.ArrayList;
import java.util.List;

public final class IntersectedRectangles {

    /**
     * It compares every input element to every input element (the element is not compared by itself) of the
     * listOfRectangle array list.
     * If finds intersect between two elements takes that to a list as a Rectangle object.
     * @param listOfRectangles List what is compared to itself.
     * @return listOfIntersections. Every element of it defines an overlapping area as a rectangle.
     */
    public static List<Rectangle> findIntersects(List<Rectangle> listOfRectangles) {
        List<Rectangle> listOfIntersections = new ArrayList<>();

        for (int i = 0; i < listOfRectangles.size() - 1; i++) {
            for (int j = i + 1; j < listOfRectangles.size(); j++) {
                listOfIntersections.add(listOfRectangles.get(i).intersection(listOfRectangles.get(j)));
            }
        }

        return listOfIntersections;
    }

    /**
     *
     * @param listOfIntersecttions
     * @return
     */
    public static List<Rectangle> findMultipleIntersects(List<Rectangle> listOfIntersecttions) {
        List<Rectangle> listOfMultipleItersects = new ArrayList<>();

        for (int i = 0; i < listOfIntersecttions.size() - 1; i++) {
            for (int j = i + 1; j < listOfIntersecttions.size(); j++) {
                listOfMultipleItersects.add(
                        new Rectangle(listOfIntersecttions.get(i).intersection(listOfIntersecttions.get(j))));
            }
        }

        return listOfMultipleItersects;
    }

    public static List<Rectangle> removeDuplicatesAndValidIntersects(List<Rectangle> listOfMultipleIntersections) {
        List<Rectangle> listOfResult = new ArrayList<>();

        for (Rectangle rect: listOfMultipleIntersections) {
            if (! listOfResult.contains(rect) &&
                    rect.getWidth() > 0 && rect.getHeight() > 0) {
                listOfResult.add(rect);
            }
        }

        return listOfResult;
    }
}