aoqi@0: #// Usage: jjs -fx -scripting logisticmap.js -- <initial_x> <R>
aoqi@0: 
aoqi@0: /*
aoqi@0:  * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
attila@962:  *
aoqi@0:  * Redistribution and use in source and binary forms, with or without
aoqi@0:  * modification, are permitted provided that the following conditions
aoqi@0:  * are met:
attila@962:  *
aoqi@0:  *   - Redistributions of source code must retain the above copyright
aoqi@0:  *     notice, this list of conditions and the following disclaimer.
attila@962:  *
aoqi@0:  *   - Redistributions in binary form must reproduce the above copyright
aoqi@0:  *     notice, this list of conditions and the following disclaimer in the
aoqi@0:  *     documentation and/or other materials provided with the distribution.
attila@962:  *
aoqi@0:  *   - Neither the name of Oracle nor the names of its
aoqi@0:  *     contributors may be used to endorse or promote products derived
aoqi@0:  *     from this software without specific prior written permission.
attila@962:  *
aoqi@0:  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
aoqi@0:  * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
aoqi@0:  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
aoqi@0:  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
aoqi@0:  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
aoqi@0:  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
aoqi@0:  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
aoqi@0:  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
aoqi@0:  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
aoqi@0:  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
aoqi@0:  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
aoqi@0:  */
aoqi@0: 
aoqi@0: // Logistic map viewer using Java8 Streams and JavaFX
aoqi@0: // See also http://en.wikipedia.org/wiki/Logistic_map
aoqi@0: 
aoqi@0: if (!$OPTIONS._fx || arguments.length < 2) {
aoqi@0:     print("Usage: jjs -fx -scripting logisticmap.js -- <initial_x> <R>");
aoqi@0:     exit(1);
aoqi@0: }
aoqi@0: 
aoqi@0: // parameters for the logistic map
aoqi@0: var x = parseFloat(arguments[0]);
aoqi@0: var R = parseFloat(arguments[1]);
aoqi@0: var NUM_POINTS = arguments.length > 2? parseFloat(arguments[2]) : 20;
aoqi@0: 
aoqi@0: // Java classes used
aoqi@0: var DoubleStream = Java.type('java.util.stream.DoubleStream');
aoqi@0: var LineChart = Java.type("javafx.scene.chart.LineChart");
aoqi@0: var NumberAxis = Java.type("javafx.scene.chart.NumberAxis");
aoqi@0: var Scene = Java.type("javafx.scene.Scene");
aoqi@0: var Stage = Java.type("javafx.stage.Stage");
aoqi@0: var XYChart = Java.type("javafx.scene.chart.XYChart");
aoqi@0: 
aoqi@0: function start(stage) {
aoqi@0:     stage.title = "Logistic Map: initial x = ${x}, R = ${R}";
aoqi@0:     // make chart
aoqi@0:     var xAxis = new NumberAxis();
aoqi@0:     var yAxis = new NumberAxis();
aoqi@0:     var lineChart = new LineChart(xAxis, yAxis);
aoqi@0:     xAxis.setLabel("iteration");
aoqi@0:     yAxis.setLabel("x");
aoqi@0:     // make chart data series
aoqi@0:     var series = new XYChart.Series();
aoqi@0:     var data = series.data;
aoqi@0:     // populate data using logistic iteration
aoqi@0:     var i = 0;
aoqi@0:     DoubleStream
aoqi@0:         .generate(function() x = R*x*(1-x))
aoqi@0:         .limit(NUM_POINTS)
aoqi@0:         .forEach(
aoqi@0:             function(value) {
aoqi@0:                 data.add(new XYChart.Data(i, value));
aoqi@0:                 i++;
aoqi@0:             }
aoqi@0:          );
aoqi@0:     // add to stage
aoqi@0:     var scene = new Scene(lineChart, 800, 600);
aoqi@0:     lineChart.data.add(series);
aoqi@0:     stage.scene = scene;
aoqi@0:     stage.show();
aoqi@0: }