FMX Charts on iOS

FMX TMS FMX UI Pack
1

Hello,



I am working in XE6, building an iPad app. I hoped to make use of FMX Charts to have a horizontal scrolling area containing 4-6 simple charts side by side. The horizontal scroll component is on a frame which is dynamically created at run time and added to a tab control.



Although performance is very acceptable in the simulator, once deployed onto an iPad everything becomes almost unusably slow and laggy. Are there any ways I can improve performance?



eg. Do panels, scrollboxes, frames or tab controls have a known impact on drawing performance? I will experiment if nobody knows, but would like to save myself the time if somebody does.



Regards

Richard

2

Are you implementing a technique where you only display the "Active chart(s)"? Could you send us your sample so we can investigate here? Please note that we have invested a large amount of time in performance optimizations, and the FireMonkey framework has a low performance on mobile devices.


Kind Regards, 
Pieter

Pieter Scheldeman2014-05-08 05:33:08
3

Pieter - I am not doing anything very clever at the moment - I dropped down 4 charts and left them with the default "dummy" series. Then I ran it to see what it looked like, and immediately noticed the performance problem.



It seems to be that the issue is the THorzScrollBox component, or having more than 1 chart - if I build just a simple app with 1 form and 4 charts on THorzScrollBox, I get the same issues. Similarly if I have 3 charts on a frame (no Scrollbox), performance is bad.



I will send the simple project to you at the support email.

4

Pieter - can you confirm if you have replicated the problem?



Thanks.

Richard

5

Hi, 


We have received the support email, and we have answered it directly.

Kind Regards, 
Pieter
6

Thanks. Not received an email yet, but will look out for it.



If it helps, the same issue with another major charting vendor was solved by a combination of:



1. Making the chart invisible when the frame/tab first displayed

2. Adding Chart.Buffered := True in the constructor or Show events

7

Hi, 


You should receive the email shortly. We have compared it to TChart which generates even slower performance.

Kind Regards, 
Pieter