jdk8-mips64-public/nashorn: samples/logisticmap.js@2f1b9f4daec1 (annotated)

samples/logisticmap.js@2f1b9f4daec1 (annotated)

samples/logisticmap.js

Fri, 05 Jun 2015 12:38:53 +0200

author: mhaupt
date: Fri, 05 Jun 2015 12:38:53 +0200
changeset 1398: 2f1b9f4daec1
parent 962: ac62e33a99b0
permissions: -rw-r--r--

8080087: Nashorn $ENV.PWD is originally undefined
Summary: On Windows, the PWD environment variable does not exist and cannot be imported in scripting mode, so it is set explicitly.
Reviewed-by: lagergren, sundar

 #// 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();
 }