


To integrate the  https://developers.google.com/chart/[Google Chart] tool into our pages we can use module wicketstuff-googlecharts. To display a chart we must combine the following entities: component Chart, interface IChartData and class ChartProvider, all inside package org.wicketstuff.googlecharts. The following snippet is taken from example page Home:

*HTML:*

[source,html]
----
...
  <h2>Hello World</h2>
  <img wicket:id="helloWorld"/>
... 
----

*Java code:*

[source,java]
----
IChartData data = new AbstractChartData(){
    public double[][] getData(){
       return new double[][] { { 34, 22 } };
    }
};

ChartProvider provider = new ChartProvider(new Dimension(250, 100), ChartType.PIE_3D, data);
provider.setPieLabels(new String[] { "Hello", "World" });
add(new Chart("helloWorld", provider));
----

*Displayed chart:*

image::../img/googlechart.png[]

As we can see in the snippet above, component Chart must be used with <img> tag while the input data returned by IChartData must be a two-dimensional array of double values. 
