#// Usage: jjs -fx barchart_weather.js

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 * 

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 *     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,

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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();

}