#// Usage: jjs -fx -scripting logisticmap.js -- <initial_x> <R>

/*

 * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.

 *

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 * modification, are permitted provided that the following conditions

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 *

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 *   - Redistributions in binary form must reproduce the above copyright

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 *

 *   - Neither the name of Oracle nor the names of its

 *     contributors may be used to endorse or promote products derived

 *     from this software without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS

 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,

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// Logistic map viewer using Java8 Streams and JavaFX

// See also http://en.wikipedia.org/wiki/Logistic_map

if (!$OPTIONS._fx || arguments.length < 2) {

    print("Usage: jjs -fx -scripting logisticmap.js -- <initial_x> <R>");

    exit(1);

}

// parameters for the logistic map

var x = parseFloat(arguments[0]);

var R = parseFloat(arguments[1]);

var NUM_POINTS = arguments.length > 2? parseFloat(arguments[2]) : 20;

// Java classes used

var DoubleStream = Java.type('java.util.stream.DoubleStream');

var LineChart = Java.type("javafx.scene.chart.LineChart");

var NumberAxis = Java.type("javafx.scene.chart.NumberAxis");

var Scene = Java.type("javafx.scene.Scene");

var Stage = Java.type("javafx.stage.Stage");

var XYChart = Java.type("javafx.scene.chart.XYChart");

function start(stage) {

    stage.title = "Logistic Map: initial x = ${x}, R = ${R}";

    // make chart

    var xAxis = new NumberAxis();

    var yAxis = new NumberAxis();

    var lineChart = new LineChart(xAxis, yAxis);

    xAxis.setLabel("iteration");

    yAxis.setLabel("x");

    // make chart data series

    var series = new XYChart.Series();

    var data = series.data;

    // populate data using logistic iteration

    var i = 0;

    DoubleStream

        .generate(function() x = R*x*(1-x))

        .limit(NUM_POINTS)

        .forEach(

            function(value) {

                data.add(new XYChart.Data(i, value));

                i++;

            }

         );

    // add to stage

    var scene = new Scene(lineChart, 800, 600);

    lineChart.data.add(series);

    stage.scene = scene;

    stage.show();

}