import javafx.scene.canvas.GraphicsContext;
import javafx.scene.paint.Color;

// * abstract class: canNOT be instantiated (is NOT instantiable)
//                   canNOT call the constructor with the "new" keyword
//                   new Stroke(...) is an error
// * new: goes to the memory, finds space big enough for object,
//        initializes all data members (instance variables),
//        and returns the address of the object

public abstract class Stroke {

	protected static final Color DEFAULT_COLOR = Color.BLACK;
	
	// common data members
	// private:    nobody but the current class has access
	// protected:  keeps access to family
	
	protected int cx, cy;
	protected int size;     // for now, radius for Circular, length for Square
	protected boolean filled; 
	
	// data members are for actual drawing operations
	protected int ulx, uly;
	protected int width, height;
	
	// must be accessed through parent's public/protected/default methods
	private Color color;
	
	public Stroke(int x, int y, int s, boolean f) {
		this(x, y, s, f, DEFAULT_COLOR);
	}
	
	public Stroke(int x, int y, int s, boolean f, Color c) {
		cx     = x;
		cy     = y;
		size   = s;
		filled = f;
		
		color  = c;

		ulx    = cx - size;
		uly    = cy - size;
		width  = size * 2;
		height = size * 2;
	}
	
	public Color getColor() {
		return color;
	}

	// when default behavior cannot be defined
	// (0) canNOT not have the method signature at least
	// (1) Fri Sep-13: some code that will never be executed
	// (2) Mon Sep-16: empty method body 
	// (3) Mon Sep-16: make the method abstract (signature exists, no body)
	// * abstract method: body will be defined by descendants
	public abstract void draw(GraphicsContext gc) ;
	
}