Contact at mumbai.academics@gmail.com or 8097636691
Responsive Ads Here

Friday, 6 July 2018

GWT Highcharts - Configuration Syntax



GWT Highcharts - Configuration Syntax

In this chapter, we will showcase the configuration required to draw a chart using the Highcharts API in GWT.

Step 1: Create GWT Application

Follow the following steps to update the GWT application we created in GWT - Create Application chapter −
StepDescription
1Create a project with a name HelloWorld under a package com.tutorialspoint as explained in the GWT - Create Application chapter.
2Modify HelloWorld.gwt.xmlHelloWorld.html and HelloWorld.java as explained below. Keep rest of the files unchanged.
3Compile and run the application to verify the result of the implemented logic.
Following is the content of the modified module descriptor src/com.tutorialspoint/HelloWorld.gwt.xml.
<?xml version = "1.0" encoding = "UTF-8"?>
<module rename-to = 'helloworld'>
   <inherits name = 'com.google.gwt.user.User'/>
   <inherits name = 'com.google.gwt.user.theme.clean.Clean'/>
   <entry-point class = 'com.tutorialspoint.client.HelloWorld'/>
   <inherits name="org.moxieapps.gwt.highcharts.Highcharts"/>
   <source path = 'client'/>
   <source path = 'shared'/>
</module>
Following is the content of the modified HTML host file war/HelloWorld.html.
<html>
   <head>
      <title>GWT Highcharts Showcase</title>
      <link rel = "stylesheet" href = "HelloWorld.css"/>
      <script language = "javascript" src = "helloworld/helloworld.nocache.js">
         <script src = "https://ajax.googleapis.com/ajax/libs/jquery/2.1.3/jquery.min.js" />
         <script src = "https://code.highcharts.com/highcharts.js" />
      </script>
   </head>
   <body>    
   </body>
</html>
We'll see the updated HelloWorld.java in the end after understanding configurations.

Step 2: Create Configurations

Create Chart

Configure the type, title and sub-title of the chart.
Chart chart = new Chart()
   .setType(Type.SPLINE)
   .setChartTitleText("Monthly Average Temperature")
   .setChartSubtitleText("Source: WorldClimate.com");

xAxis

Configure the ticker to be displayed on the X-Axis.
XAxis xAxis = chart.getXAxis();
xAxis.setCategories("Jan", "Feb", "Mar", "Apr", "May", "Jun",
   "Jul", "Aug", "Sep", "Oct", "Nov", "Dec");

yAxis

Configure the title, plot lines to be displayed on the Y-Axis.
YAxis yAxis = chart.getYAxis();
yAxis.setAxisTitleText("Temperature °C");
yAxis.createPlotLine()
   .setValue(0)
   .setWidth(1)
   .setColor("#808080");  

tooltip

Configure the tooltip. Put suffix to be added after value (y-axis).
ToolTip toolTip = new ToolTip();
toolTip.setValueSuffix("°C");
chart.setToolTip(toolTip);

legend

Configure the legend to be displayed on the right side of the chart along with other properties.
legend.setLayout(Legend.Layout.VERTICAL)
   .setAlign(Legend.Align.RIGHT)
   .setVerticalAlign(Legend.VerticalAlign.TOP)
   .setX(-10)
   .setY(100)
   .setBorderWidth(0);
chart.setLegend(legend);

series

Configure the data to be displayed on the chart. Series is an array where each element of this array represents a single line on the chart.
chart.addSeries(chart.createSeries()
   .setName("Tokyo")
   .setPoints(new Number[] {
      7.0, 6.9, 9.5, 14.5, 18.2, 21.5, 25.2,
      26.5, 23.3, 18.3, 13.9, 9.6
   })
);

chart.addSeries(chart.createSeries()
   .setName("New York")
   .setPoints(new Number[] {
      -0.2, 0.8, 5.7, 11.3, 17.0, 22.0, 24.8, 
      24.1, 20.1, 14.1, 8.6, 2.5
   })
);

chart.addSeries(chart.createSeries()
   .setName("Berlin")
   .setPoints(new Number[] {
      -0.9, 0.6, 3.5, 8.4, 13.5, 17.0, 18.6,
      17.9, 14.3, 9.0, 3.9, 1.0
   })
);

chart.addSeries(chart.createSeries()
   .setName("London")
   .setPoints(new Number[] {
      3.9, 4.2, 5.7, 8.5, 11.9, 15.2, 17.0, 
      16.6, 14.2, 10.3, 6.6, 4.8
   })
);

Step 3: Add the chart to parent panel.

We're adding the chart to root panel.
RootPanel.get().add(chart);

Example

Consider the following example to further understand the Configuration Syntax −
HelloWorld.java
package com.tutorialspoint.client;

import org.moxieapps.gwt.highcharts.client.Chart;
import org.moxieapps.gwt.highcharts.client.Legend;
import org.moxieapps.gwt.highcharts.client.Series.Type;
import org.moxieapps.gwt.highcharts.client.ToolTip;
import org.moxieapps.gwt.highcharts.client.XAxis;
import org.moxieapps.gwt.highcharts.client.YAxis;

import com.google.gwt.core.client.EntryPoint;
import com.google.gwt.user.client.ui.RootPanel;

public class HelloWorld implements EntryPoint {
   public void onModuleLoad() {
      Chart chart = new Chart()
         .setType(Type.SPLINE)
         .setChartTitleText("Monthly Average Temperature")
         .setChartSubtitleText("Source: WorldClimate.com");

      XAxis xAxis = chart.getXAxis();
      xAxis.setCategories("Jan", "Feb", "Mar", "Apr", "May", "Jun",
         "Jul", "Aug", "Sep", "Oct", "Nov", "Dec");

      YAxis yAxis = chart.getYAxis();
      yAxis.setAxisTitleText("Temperature °C");
      yAxis.createPlotLine()
         .setValue(0)
         .setWidth(1)
         .setColor("#808080");

      ToolTip toolTip = new ToolTip();
      toolTip.setValueSuffix("°C");
      chart.setToolTip(toolTip);

      Legend legend = new Legend();
      legend.setLayout(Legend.Layout.VERTICAL)
         .setAlign(Legend.Align.RIGHT)
         .setVerticalAlign(Legend.VerticalAlign.TOP)
         .setX(-10)
         .setY(100)
         .setBorderWidth(0);
      chart.setLegend(legend);

      chart.addSeries(chart.createSeries()
         .setName("Tokyo")
         .setPoints(new Number[] {
            7.0, 6.9, 9.5, 14.5, 18.2, 21.5, 25.2,
            26.5, 23.3, 18.3, 13.9, 9.6
         })
      );

      chart.addSeries(chart.createSeries()
         .setName("New York")
         .setPoints(new Number[] {
            -0.2, 0.8, 5.7, 11.3, 17.0, 22.0, 24.8, 
            24.1, 20.1, 14.1, 8.6, 2.5
         })
      );

      chart.addSeries(chart.createSeries()
         .setName("Berlin")
         .setPoints(new Number[] {
            -0.9, 0.6, 3.5, 8.4, 13.5, 17.0, 18.6,
            17.9, 14.3, 9.0, 3.9, 1.0
         })
      );

      chart.addSeries(chart.createSeries()
         .setName("London")
         .setPoints(new Number[] {
            3.9, 4.2, 5.7, 8.5, 11.9, 15.2, 17.0, 
            16.6, 14.2, 10.3, 6.6, 4.8
         })
      );
      RootPanel.get().add(chart);
   }
}

Result

Verify the result.
Basic Line Chart

No comments:

Post a Comment