MouseDemo.java

import javafx.application.Application;
import javafx.stage.Stage;
import javafx.scene.Group;
//import javafx.scene.Cursor;
import javafx.scene.*;
import javafx.event.EventHandler;
import javafx.scene.paint.*;
import javafx.scene.shape.*;
import javafx.collections.*;
import javafx.geometry.Point2D;
import javafx.geometry.Bounds;
import javafx.scene.input.* ;
import javafx.scene.layout.Pane;
import java.lang.Math;

import java.awt.image.BufferedImage;
import java.awt.Graphics2D;

import javafx.scene.control.Button;
import javafx.event.ActionEvent;
import javafx.scene.layout.BorderPane;
import javafx.scene.layout.HBox;

import java.util.ArrayList;

public class MouseDemo extends Application {
    Group grp = new Group();
    ArrayList<Capacitor3> list = new ArrayList<Capacitor3>();

    public void start(Stage stage) {
	// Create a border pane 
    	BorderPane pane = new BorderPane();
	Scene scene = new Scene(pane, 400, 400);

	Pane mypane = new Pane();
	pane.setCenter(mypane);
	mypane.getChildren().add(grp);



	grp.setTranslateX(scene.getWidth()/2);
	grp.setTranslateY(scene.getHeight()/2);
	double res = 96;
	grp.setScaleX(res);
	grp.setScaleY(res);

	Grid.draw(grp);

	grp.setOnMousePressed( e ->
	{
	    //System.out.println("event type " + e.getEventType());
	    //System.out.println("Local " + e.getX() + "  " + e.getY());
	    Point2D pt = new Point2D(e.getScreenX(),e.getScreenY());
	    Capacitor3 current = find(pt);
	    if (current==null) {
	    	Capacitor3 c = new Capacitor3();
	    	c.setPosition(e.getX(),-e.getY());
	    	c.draw(grp);
	    	list.add(c);
	    }
	}
	);

	grp.setOnMouseClicked( e ->
	{
	    Point2D pt = new Point2D(e.getScreenX(),e.getScreenY());
		if (e.getClickCount()>=2) {
			Capacitor3 current = find(pt);
			if (current==null) return;
			list.remove(current);
			grp.getChildren().remove(current.grp);
		}
		//System.out.println(e.getEventType() + " click count " + e.getClickCount());
	}
	);
/*
	Capacitor3 c1 =	new Capacitor3();
	c1.setPosition(-1.0,0.0);
	c1.draw(grp);
	list.add(c1);

	Capacitor3 c2 = new Capacitor3();
	c2.setPosition(1.0,1.0);
	c2.setAngle(30.0);
	c2.draw(grp);
	list.add(c2);
*/
	

        stage.setTitle("MouseDemo");
        stage.setScene(scene);
        stage.show();

    }

    public Capacitor3 find(Point2D pt) {
	    for (Capacitor3 ct: list) {
			if (ct.contains(pt)) return ct;
	    }
	    return null;
    }
}