nashorn/samples/logisticmap.js
author cjplummer
Mon, 25 Apr 2016 12:11:58 -0700
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8154379: MIN_STACK_SHADOW_PAGES should equal DEFAULT_STACK_SHADOW_PAGES on aarch64 Summary: Undid previous change that had set it to 1. Reviewed-by: enevill, adinn, aph
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#// Usage: jjs -fx -scripting logisticmap.js -- <initial_x> <R>
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/*
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 * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 *
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 *   - Redistributions of source code must retain the above copyright
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 *     notice, this list of conditions and the following disclaimer.
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 *
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 *   - Redistributions in binary form must reproduce the above copyright
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 *     notice, this list of conditions and the following disclaimer in the
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 *     documentation and/or other materials provided with the distribution.
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 *
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 *   - Neither the name of Oracle nor the names of its
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 *     contributors may be used to endorse or promote products derived
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 *     from this software without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
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 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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// Logistic map viewer using Java8 Streams and JavaFX
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// See also http://en.wikipedia.org/wiki/Logistic_map
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if (!$OPTIONS._fx || arguments.length < 2) {
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    print("Usage: jjs -fx -scripting logisticmap.js -- <initial_x> <R>");
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    exit(1);
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}
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// parameters for the logistic map
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var x = parseFloat(arguments[0]);
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var R = parseFloat(arguments[1]);
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var NUM_POINTS = arguments.length > 2? parseFloat(arguments[2]) : 20;
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// Java classes used
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var DoubleStream = Java.type('java.util.stream.DoubleStream');
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var LineChart = Java.type("javafx.scene.chart.LineChart");
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var NumberAxis = Java.type("javafx.scene.chart.NumberAxis");
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var Scene = Java.type("javafx.scene.Scene");
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var Stage = Java.type("javafx.stage.Stage");
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var XYChart = Java.type("javafx.scene.chart.XYChart");
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function start(stage) {
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    stage.title = "Logistic Map: initial x = ${x}, R = ${R}";
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    // make chart
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    var xAxis = new NumberAxis();
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    var yAxis = new NumberAxis();
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    var lineChart = new LineChart(xAxis, yAxis);
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    xAxis.setLabel("iteration");
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    yAxis.setLabel("x");
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    // make chart data series
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    var series = new XYChart.Series();
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    var data = series.data;
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    // populate data using logistic iteration
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    var i = 0;
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    DoubleStream
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        .generate(function() x = R*x*(1-x))
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        .limit(NUM_POINTS)
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        .forEach(
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            function(value) {
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                data.add(new XYChart.Data(i, value));
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                i++;
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            }
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         );
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    // add to stage
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    var scene = new Scene(lineChart, 800, 600);
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    lineChart.data.add(series);
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    stage.scene = scene;
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    stage.show();
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}