Drill down pie chart using SVG

Question

Having read several posts in this forum regarding SVG, pie charts and drilling down, I get the impression that it is possible, using the "link" column in the chart query, to drill down to another page.
My requirement is similar in that given a pie chart, the user can click on one of the sections of the pie and see more detail in another pie chart. The difference is that the page should not change (ie: other graphics and content ought not change when the pie chart is clicked).
Has anyone worked out a solution for something like this?
Is it, for example, possible to, on clicking the pie chart, have a conditional display set for a previously hidden chart and hide the original chart?
Your replies are appreciated.

Answer 1

I just re-read this and realize you want it on the same page. Same logic applies. Create a hidden item, a second chart region taking in the parameter from the first, and set it to show only when the hidden item is not null.
Let me know what you think:
http://htmldb.oracle.com/pls/otn/f?p=20332:1
Code for the first chart is:
select 'f?p='||:APP_ID||':1:::::P1_DRILLDOWN:'||cu.customer_id,
       cu.cust_first_name || ' ' || cu.cust_last_name,
       count(ord.order_id)
  from demo_orders ord,
       demo_customers cu
where cu.customer_id = ord.customer_id
group by 'f?p='||:APP_ID||':1:::::P1_DRILLDOWN:'||cu.customer_id,
cu.cust_first_name || ' ' || cu.cust_last_name2nd Chart:
select null,
       product_name,
       count(ite.product_id)
  from demo_orders ord,
       demo_order_items ite,
       demo_product_info pro
where ord.order_id = ite.order_id and
       ite.product_id = pro.product_id and
       ord.customer_id = :P1_DRILLDOWN
group by product_nameModify as necessary.