1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/samples/logisticmap.js Wed Apr 27 01:36:41 2016 +0800
1.3 @@ -0,0 +1,82 @@
1.4 +#// Usage: jjs -fx -scripting logisticmap.js -- <initial_x> <R>
1.5 +
1.6 +/*
1.7 + * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
1.8 + *
1.9 + * Redistribution and use in source and binary forms, with or without
1.10 + * modification, are permitted provided that the following conditions
1.11 + * are met:
1.12 + *
1.13 + * - Redistributions of source code must retain the above copyright
1.14 + * notice, this list of conditions and the following disclaimer.
1.15 + *
1.16 + * - Redistributions in binary form must reproduce the above copyright
1.17 + * notice, this list of conditions and the following disclaimer in the
1.18 + * documentation and/or other materials provided with the distribution.
1.19 + *
1.20 + * - Neither the name of Oracle nor the names of its
1.21 + * contributors may be used to endorse or promote products derived
1.22 + * from this software without specific prior written permission.
1.23 + *
1.24 + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
1.25 + * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
1.26 + * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
1.27 + * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
1.28 + * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
1.29 + * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
1.30 + * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
1.31 + * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
1.32 + * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
1.33 + * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
1.34 + * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
1.35 + */
1.36 +
1.37 +// Logistic map viewer using Java8 Streams and JavaFX
1.38 +// See also http://en.wikipedia.org/wiki/Logistic_map
1.39 +
1.40 +if (!$OPTIONS._fx || arguments.length < 2) {
1.41 + print("Usage: jjs -fx -scripting logisticmap.js -- <initial_x> <R>");
1.42 + exit(1);
1.43 +}
1.44 +
1.45 +// parameters for the logistic map
1.46 +var x = parseFloat(arguments[0]);
1.47 +var R = parseFloat(arguments[1]);
1.48 +var NUM_POINTS = arguments.length > 2? parseFloat(arguments[2]) : 20;
1.49 +
1.50 +// Java classes used
1.51 +var DoubleStream = Java.type('java.util.stream.DoubleStream');
1.52 +var LineChart = Java.type("javafx.scene.chart.LineChart");
1.53 +var NumberAxis = Java.type("javafx.scene.chart.NumberAxis");
1.54 +var Scene = Java.type("javafx.scene.Scene");
1.55 +var Stage = Java.type("javafx.stage.Stage");
1.56 +var XYChart = Java.type("javafx.scene.chart.XYChart");
1.57 +
1.58 +function start(stage) {
1.59 + stage.title = "Logistic Map: initial x = ${x}, R = ${R}";
1.60 + // make chart
1.61 + var xAxis = new NumberAxis();
1.62 + var yAxis = new NumberAxis();
1.63 + var lineChart = new LineChart(xAxis, yAxis);
1.64 + xAxis.setLabel("iteration");
1.65 + yAxis.setLabel("x");
1.66 + // make chart data series
1.67 + var series = new XYChart.Series();
1.68 + var data = series.data;
1.69 + // populate data using logistic iteration
1.70 + var i = 0;
1.71 + DoubleStream
1.72 + .generate(function() x = R*x*(1-x))
1.73 + .limit(NUM_POINTS)
1.74 + .forEach(
1.75 + function(value) {
1.76 + data.add(new XYChart.Data(i, value));
1.77 + i++;
1.78 + }
1.79 + );
1.80 + // add to stage
1.81 + var scene = new Scene(lineChart, 800, 600);
1.82 + lineChart.data.add(series);
1.83 + stage.scene = scene;
1.84 + stage.show();
1.85 +}
