83 lines
3.2 KiB
JavaScript
83 lines
3.2 KiB
JavaScript
#// 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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}
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