import objectdraw.*;
import java.awt.*;

/**
 * A recursive Broccoli structure.
 */
public class Broccoli {
    
    // dark green color for broccoli
    private static final Color BROCCOLI_COLOR = new Color(0, 135, 0);

    // How much broccoli shrinks each call
    private static final double SHRINK_FACTOR = 0.8;   

    // How little a branch must be before broccoli stops expanding
    private static final double SIZE_SMALLEST_BRANCH = 20.0; 

    // angle increment/decrement for left and right branches
    private static final double BRANCH_ANGLE_INC = Math.PI / 9.0;

    // stem of broccoli
    private AngLine stem;
    
    // branches of broccoli
    private Broccoli leftBranch, centerBranch, rightBranch;    
    
    // length of stem
    private double stemLength;

    // Draw broccoli by recursively drawing branches 
    public Broccoli(Location stemStartLocation, double stemLength, 
            double stemAngle, DrawingCanvas canvas) {
                
        this.stemLength = stemLength;

        // Draw stem and color green                        
        stem = new AngLine(stemStartLocation, stemLength, stemAngle, canvas);    
        stem.setColor(BROCCOLI_COLOR);

        // Big enough to keep growing
        if (stemLength > SIZE_SMALLEST_BRANCH) {  

            // end of stem
            Location nextStartLocation = stem.getEnd(); 

            leftBranch = new Broccoli(nextStartLocation, stemLength * SHRINK_FACTOR,
                stemAngle + BRANCH_ANGLE_INC, canvas);

            centerBranch = new Broccoli(nextStartLocation, stemLength * SHRINK_FACTOR,
                stemAngle, canvas);

            rightBranch = new Broccoli(nextStartLocation, stemLength * SHRINK_FACTOR,
                stemAngle - BRANCH_ANGLE_INC, canvas);

        } 

    }

    // is a Location object "in" the Broccoli?
    public boolean contains(Location point) {

        if (stem.contains(point)) {
            return true;
        }

        if (stemLength > SIZE_SMALLEST_BRANCH) {    
            return leftBranch.contains(point) || centerBranch.contains(point) || rightBranch.contains(point);
        }

        return false;

    }

    // move broccoli by offsets x and y
    public void move(double xPixels, double yPixels) {

        stem.move(xPixels, yPixels);

        if (stemLength > SIZE_SMALLEST_BRANCH) {

            leftBranch.move(xPixels, yPixels);
            centerBranch.move(xPixels, yPixels);
            rightBranch.move(xPixels, yPixels);

        } 

    }

}