Mon, 09 Nov 2015 13:45:10 -0800
Merge
aoqi@0 | 1 | #// Usage: jjs -fx -scripting logisticmap.js -- <initial_x> <R> |
aoqi@0 | 2 | |
aoqi@0 | 3 | /* |
aoqi@0 | 4 | * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved. |
attila@962 | 5 | * |
aoqi@0 | 6 | * Redistribution and use in source and binary forms, with or without |
aoqi@0 | 7 | * modification, are permitted provided that the following conditions |
aoqi@0 | 8 | * are met: |
attila@962 | 9 | * |
aoqi@0 | 10 | * - Redistributions of source code must retain the above copyright |
aoqi@0 | 11 | * notice, this list of conditions and the following disclaimer. |
attila@962 | 12 | * |
aoqi@0 | 13 | * - Redistributions in binary form must reproduce the above copyright |
aoqi@0 | 14 | * notice, this list of conditions and the following disclaimer in the |
aoqi@0 | 15 | * documentation and/or other materials provided with the distribution. |
attila@962 | 16 | * |
aoqi@0 | 17 | * - Neither the name of Oracle nor the names of its |
aoqi@0 | 18 | * contributors may be used to endorse or promote products derived |
aoqi@0 | 19 | * from this software without specific prior written permission. |
attila@962 | 20 | * |
aoqi@0 | 21 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS |
aoqi@0 | 22 | * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, |
aoqi@0 | 23 | * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
aoqi@0 | 24 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR |
aoqi@0 | 25 | * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
aoqi@0 | 26 | * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
aoqi@0 | 27 | * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
aoqi@0 | 28 | * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF |
aoqi@0 | 29 | * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING |
aoqi@0 | 30 | * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
aoqi@0 | 31 | * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
aoqi@0 | 32 | */ |
aoqi@0 | 33 | |
aoqi@0 | 34 | // Logistic map viewer using Java8 Streams and JavaFX |
aoqi@0 | 35 | // See also http://en.wikipedia.org/wiki/Logistic_map |
aoqi@0 | 36 | |
aoqi@0 | 37 | if (!$OPTIONS._fx || arguments.length < 2) { |
aoqi@0 | 38 | print("Usage: jjs -fx -scripting logisticmap.js -- <initial_x> <R>"); |
aoqi@0 | 39 | exit(1); |
aoqi@0 | 40 | } |
aoqi@0 | 41 | |
aoqi@0 | 42 | // parameters for the logistic map |
aoqi@0 | 43 | var x = parseFloat(arguments[0]); |
aoqi@0 | 44 | var R = parseFloat(arguments[1]); |
aoqi@0 | 45 | var NUM_POINTS = arguments.length > 2? parseFloat(arguments[2]) : 20; |
aoqi@0 | 46 | |
aoqi@0 | 47 | // Java classes used |
aoqi@0 | 48 | var DoubleStream = Java.type('java.util.stream.DoubleStream'); |
aoqi@0 | 49 | var LineChart = Java.type("javafx.scene.chart.LineChart"); |
aoqi@0 | 50 | var NumberAxis = Java.type("javafx.scene.chart.NumberAxis"); |
aoqi@0 | 51 | var Scene = Java.type("javafx.scene.Scene"); |
aoqi@0 | 52 | var Stage = Java.type("javafx.stage.Stage"); |
aoqi@0 | 53 | var XYChart = Java.type("javafx.scene.chart.XYChart"); |
aoqi@0 | 54 | |
aoqi@0 | 55 | function start(stage) { |
aoqi@0 | 56 | stage.title = "Logistic Map: initial x = ${x}, R = ${R}"; |
aoqi@0 | 57 | // make chart |
aoqi@0 | 58 | var xAxis = new NumberAxis(); |
aoqi@0 | 59 | var yAxis = new NumberAxis(); |
aoqi@0 | 60 | var lineChart = new LineChart(xAxis, yAxis); |
aoqi@0 | 61 | xAxis.setLabel("iteration"); |
aoqi@0 | 62 | yAxis.setLabel("x"); |
aoqi@0 | 63 | // make chart data series |
aoqi@0 | 64 | var series = new XYChart.Series(); |
aoqi@0 | 65 | var data = series.data; |
aoqi@0 | 66 | // populate data using logistic iteration |
aoqi@0 | 67 | var i = 0; |
aoqi@0 | 68 | DoubleStream |
aoqi@0 | 69 | .generate(function() x = R*x*(1-x)) |
aoqi@0 | 70 | .limit(NUM_POINTS) |
aoqi@0 | 71 | .forEach( |
aoqi@0 | 72 | function(value) { |
aoqi@0 | 73 | data.add(new XYChart.Data(i, value)); |
aoqi@0 | 74 | i++; |
aoqi@0 | 75 | } |
aoqi@0 | 76 | ); |
aoqi@0 | 77 | // add to stage |
aoqi@0 | 78 | var scene = new Scene(lineChart, 800, 600); |
aoqi@0 | 79 | lineChart.data.add(series); |
aoqi@0 | 80 | stage.scene = scene; |
aoqi@0 | 81 | stage.show(); |
aoqi@0 | 82 | } |