AbstractShape.java

package shape;

import javafx.geometry.Point2D;
import javafx.scene.canvas.GraphicsContext;

import java.util.ArrayList;
import java.util.List;

public abstract class AbstractShape implements Shape {
    private List<Point2D> points;

    public AbstractShape(){
        this.points = new ArrayList<>();
    }
    @Override
    public int pointsCount() {
        return this.points.size();
    }

    @Override
    public Point2D point(int index) {
        return this.points.get(index);
    }

    @Override
    abstract public void draw(GraphicsContext context) ;
    public void addPoints(List<Point2D> points) {
         this.points.addAll(points);
    }
}