barchart_weather.js revision 802:235d22ccfd24 
1#// Usage: jjs -fx barchart_weather.js
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// Example that retrieves weather data from a URL in JSON
35// format and draws bar chart using JavaFX
36
37// -fx check
38if (! $OPTIONS._fx) {
39    print("Usage: jjs -fx barchart_weather.js");
40    exit(1);
41}
42
43// Java classes used
44var URL = Java.type("java.net.URL");
45var BufferedReader = Java.type("java.io.BufferedReader");
46var InputStreamReader = Java.type("java.io.InputStreamReader");
47
48// function to retrieve text content of the given URL
49function readTextFromURL(url) {
50    var str = '';
51    var u = new URL(url);
52    var reader = new BufferedReader(
53        new InputStreamReader(u.openStream()));
54    try {
55        reader.lines().forEach(function(x) str += x);
56        return str;
57    } finally {
58        reader.close();
59    }
60}
61
62// change URL for your city here!
63var url = "http://api.openweathermap.org/data/2.5/forecast?q=chennai,india&units=metric&mode=json";
64
65// download JSON document and parse
66var json = readTextFromURL(url);
67var weather = JSON.parse(json);
68
69// View JSON of this using site such as http://www.jsoneditoronline.org/ to know
70// about the JSON data format used by this site
71
72// Extracted data from the json object
73var temp = weather.list.map(function(x) x.main.temp);
74var temp_min = weather.list.map(function(x) x.main.temp_min);
75var temp_max = weather.list.map(function(x) x.main.temp_max);
76var date = weather.list.map(function(x) x.dt_txt);
77
78// JavaFX classes used
79var Scene = Java.type("javafx.scene.Scene");
80var BarChart = Java.type("javafx.scene.chart.BarChart");
81var CategoryAxis = Java.type("javafx.scene.chart.CategoryAxis");
82var NumberAxis = Java.type("javafx.scene.chart.NumberAxis");
83var XYChart = Java.type("javafx.scene.chart.XYChart");
84
85function start(stage) {
86    stage.title="Chennai Weather Bar Chart";
87    var xAxis = new CategoryAxis();
88    xAxis.label = "date/time";
89    var yAxis = new NumberAxis();
90    yAxis.label = "temp in C";
91    var bc = new BarChart(xAxis, yAxis);
92
93    // 3 bars per datetime item - temp, min temp and max temp
94    var s1 = new XYChart.Series();
95    s1.name = "temp";
96    for (d in date) {
97        s1.data.add(new XYChart.Data(date[d], temp[d]));
98    }
99
100    var s2 = new XYChart.Series();
101    s2.name = "min temp";
102    for (d in date) {
103        s2.data.add(new XYChart.Data(date[d], temp_min[d]));
104    }
105
106    var s3 = new XYChart.Series();
107    s3.name = "max temp";
108    for (d in date) {
109        s3.data.add(new XYChart.Data(date[d], temp_max[d]));
110    }
111
112    bc.data.addAll(s1, s2, s3);
113
114    stage.scene = new Scene(bc, 800, 600);
115    stage.show();
116}
117