Mercurial > jdk8-mips64-public > nashorn / file revision

 #// Usage: jjs -fx -scripting logisticmap.js -- <initial_x> <R>

 /*

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  *     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,

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 // 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();

 }