GridRegion.java

import java.awt.geom.Area;
import java.util.ArrayList;

public class GridRegion {

    private double primaryAngle;
    private int minX;
    private int minY;
    private int maxX;
    private int maxY;
    private Area area;
    private ArrayList<GridCell> cells;
    
    public GridRegion(double primaryAngle){
        cells = new ArrayList<GridCell>();
        this.primaryAngle = primaryAngle;
        minX = Integer.MAX_VALUE;
        minY = Integer.MAX_VALUE;
        maxX = Integer.MIN_VALUE;
        maxY = Integer.MIN_VALUE;
    }
    
    public ArrayList<GridCell> getCells(){
        return cells;
    }
    
    public void addCell(GridCell cell){
        area = null;
        cells.add(cell);
        if(cell.getX() < minX)
            minX = cell.getX();
        if(cell.getY() < minY)
            minY = cell.getY();
        if(cell.getX()+cell.getWidth() > maxX)
            maxX = cell.getX()+cell.getWidth();
        if(cell.getY()+cell.getHeight() > maxY)
            maxY = cell.getY()+cell.getHeight();
    }
    
    public double getPrimaryAngle(){
        return primaryAngle;
    }
    
    public int getMinX(){
        return minX;
    }
    
    public int getMinY(){
        return minY;
    }
    
    public int getMaxX(){
        return maxX;
    }
    
    public int getMaxY(){
        return maxY;
    }
    
    public boolean contains(Node node){
        if(area == null){
            area = new Area();
            for(GridCell c : cells){
                area.add(new Area(c.bounds()));
            }
        }
        return area.contains(node.getX(), node.getY());
    }
    
    public Node center(){
        return new Node((minX+maxX)/2, (minY+maxY)/2);
    }
    
    public void updatePrimaryAngle(){
        double diffSum = 0;
        for(GridCell c : cells){
            double diff = c.getPrimaryAngle() - primaryAngle;
            if(diff > 90)
                diffSum = diffSum + 180-diff;
            else if(diff < -90)
                diffSum = diffSum - 180-diff;
            else
                diffSum = diffSum + diff;
        }
        primaryAngle = primaryAngle + (diffSum/cells.size());
    }
}