Mercurial > jdk8-mips64-public > nashorn / file comparison
comparison: samples/logisticmap.js
samples/logisticmap.js
- changeset 0
- b1a7da25b547
- child 962
- ac62e33a99b0
equal
deleted
inserted
replaced
| -1:000000000000 | 0:b1a7da25b547 |
|---|---|
| 1 #// Usage: jjs -fx -scripting logisticmap.js -- <initial_x> <R> | |
| 2 | |
| 3 /* | |
| 4 * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved. | |
| 5 * | |
| 6 * Redistribution and use in source and binary forms, with or without | |
| 7 * modification, are permitted provided that the following conditions | |
| 8 * are met: | |
| 9 * | |
| 10 * - Redistributions of source code must retain the above copyright | |
| 11 * notice, this list of conditions and the following disclaimer. | |
| 12 * | |
| 13 * - Redistributions in binary form must reproduce the above copyright | |
| 14 * notice, this list of conditions and the following disclaimer in the | |
| 15 * documentation and/or other materials provided with the distribution. | |
| 16 * | |
| 17 * - Neither the name of Oracle nor the names of its | |
| 18 * contributors may be used to endorse or promote products derived | |
| 19 * from this software without specific prior written permission. | |
| 20 * | |
| 21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS | |
| 22 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, | |
| 23 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR | |
| 24 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR | |
| 25 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, | |
| 26 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, | |
| 27 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR | |
| 28 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF | |
| 29 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING | |
| 30 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS | |
| 31 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
| 32 */ | |
| 33 | |
| 34 // Logistic map viewer using Java8 Streams and JavaFX | |
| 35 // See also http://en.wikipedia.org/wiki/Logistic_map | |
| 36 | |
| 37 if (!$OPTIONS._fx || arguments.length < 2) { | |
| 38 print("Usage: jjs -fx -scripting logisticmap.js -- <initial_x> <R>"); | |
| 39 exit(1); | |
| 40 } | |
| 41 | |
| 42 // parameters for the logistic map | |
| 43 var x = parseFloat(arguments[0]); | |
| 44 var R = parseFloat(arguments[1]); | |
| 45 var NUM_POINTS = arguments.length > 2? parseFloat(arguments[2]) : 20; | |
| 46 | |
| 47 // Java classes used | |
| 48 var DoubleStream = Java.type('java.util.stream.DoubleStream'); | |
| 49 var LineChart = Java.type("javafx.scene.chart.LineChart"); | |
| 50 var NumberAxis = Java.type("javafx.scene.chart.NumberAxis"); | |
| 51 var Scene = Java.type("javafx.scene.Scene"); | |
| 52 var Stage = Java.type("javafx.stage.Stage"); | |
| 53 var XYChart = Java.type("javafx.scene.chart.XYChart"); | |
| 54 | |
| 55 function start(stage) { | |
| 56 stage.title = "Logistic Map: initial x = ${x}, R = ${R}"; | |
| 57 // make chart | |
| 58 var xAxis = new NumberAxis(); | |
| 59 var yAxis = new NumberAxis(); | |
| 60 var lineChart = new LineChart(xAxis, yAxis); | |
| 61 xAxis.setLabel("iteration"); | |
| 62 yAxis.setLabel("x"); | |
| 63 // make chart data series | |
| 64 var series = new XYChart.Series(); | |
| 65 var data = series.data; | |
| 66 // populate data using logistic iteration | |
| 67 var i = 0; | |
| 68 DoubleStream | |
| 69 .generate(function() x = R*x*(1-x)) | |
| 70 .limit(NUM_POINTS) | |
| 71 .forEach( | |
| 72 function(value) { | |
| 73 data.add(new XYChart.Data(i, value)); | |
| 74 i++; | |
| 75 } | |
| 76 ); | |
| 77 // add to stage | |
| 78 var scene = new Scene(lineChart, 800, 600); | |
| 79 lineChart.data.add(series); | |
| 80 stage.scene = scene; | |
| 81 stage.show(); | |
| 82 } |
