| #// Usage: jjs -fx -scripting logisticmap.js -- <initial_x> <R> |
| |
| /* |
| * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * |
| * - Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * |
| * - Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * |
| * - 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, |
| * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR |
| * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
| * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
| * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
| * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF |
| * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING |
| * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
| * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| // 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(); |
| } |