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

 #// Usage: jjs -fx barchart_weather.js

 /*

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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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 // 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();

 }