Create image by painting from a managed bean method, same as "paint" (Graphics2D) in "SWING" components.

Figure 6.78.  <rich:paint2D> component

The example shows two main attributes of the component:

The "format" attribute of the component defines a format of visual data passing to the server.

Generated data can be used as a cacheable or non-cacheable resource. It's defined with "cacheable" attribute. If cache support is turned on, a key is created in URI with a mix of size (width/height), "paint" method, "format" and "data" attributes.

Example:

paintBean.java:

      

public void paint(Graphics2D g2, Object obj) {

        // code that gets data from the data Bean (PaintData)

       PaintData data = (PaintData) obj;

        ...

        // a code drawing a rectangle

        g2.drawRect(0, 0, data.Width, data.Height);

        ...

        // some more code placing graphical data into g2 stream below

}

     

dataBean.java:

    

public class PaintData implements Serializable{

        private static final long serialVersionUID = 1L;

        Integer Width=100;

        Integer Height=50;

       ...

}

    

page.xhtml:


...

<rich:paint2D paint="#{paint2D.paint}" data="#{paint2DModel.data}"/>

... 

Table of <rich:paint2D> attributes.

On the component LiveDemo page you can see the example of <rich:paint2D> usage and sources for the given example.