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

samples/barchart_weather.js@2f1b9f4daec1 (annotated)

samples/barchart_weather.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 barchart_weather.js
 /*
  * 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.
  */
 // Example that retrieves weather data from a URL in JSON
 // format and draws bar chart using JavaFX
 // -fx check
 if (! $OPTIONS._fx) {
     print("Usage: jjs -fx barchart_weather.js");
     exit(1);
 }
 // Java classes used
 var URL = Java.type("java.net.URL");
 var BufferedReader = Java.type("java.io.BufferedReader");
 var InputStreamReader = Java.type("java.io.InputStreamReader");
 // function to retrieve text content of the given URL
 function readTextFromURL(url) {
     var str = '';
     var u = new URL(url);
     var reader = new BufferedReader(
         new InputStreamReader(u.openStream()));
     try {
         reader.lines().forEach(function(x) str += x);
         return str;
     } finally {
         reader.close();
     }
 }
 // change URL for your city here!
 var url = "http://api.openweathermap.org/data/2.5/forecast?q=chennai,india&units=metric&mode=json";
 // download JSON document and parse
 var json = readTextFromURL(url);
 var weather = JSON.parse(json);
 // View JSON of this using site such as http://www.jsoneditoronline.org/ to know
 // about the JSON data format used by this site
 // Extracted data from the json object
 var temp = weather.list.map(function(x) x.main.temp);
 var temp_min = weather.list.map(function(x) x.main.temp_min);
 var temp_max = weather.list.map(function(x) x.main.temp_max);
 var date = weather.list.map(function(x) x.dt_txt);
 // JavaFX classes used
 var Scene = Java.type("javafx.scene.Scene");
 var BarChart = Java.type("javafx.scene.chart.BarChart");
 var CategoryAxis = Java.type("javafx.scene.chart.CategoryAxis");
 var NumberAxis = Java.type("javafx.scene.chart.NumberAxis");
 var XYChart = Java.type("javafx.scene.chart.XYChart");
 function start(stage) {
     stage.title="Chennai Weather Bar Chart";
     var xAxis = new CategoryAxis();
     xAxis.label = "date/time";
     var yAxis = new NumberAxis();
     yAxis.label = "temp in C";
     var bc = new BarChart(xAxis, yAxis);
     // 3 bars per datetime item - temp, min temp and max temp
     var s1 = new XYChart.Series();
     s1.name = "temp";
     for (d in date) {
         s1.data.add(new XYChart.Data(date[d], temp[d]));
     }
     var s2 = new XYChart.Series();
     s2.name = "min temp";
     for (d in date) {
         s2.data.add(new XYChart.Data(date[d], temp_min[d]));
     }
     var s3 = new XYChart.Series();
     s3.name = "max temp";
     for (d in date) {
         s3.data.add(new XYChart.Data(date[d], temp_max[d]));
     }
     bc.data.addAll(s1, s2, s3);
     stage.scene = new Scene(bc, 800, 600);
     stage.show();
 }