Hai everybody ,
past two days , I asked my queries regarding markers plug-ins in CDAT mailing list.
The CDAT developer Mr.Charles سمير Doutriaux replied to all my queires patientlly.
I thought , the markers source code is written by python.
But i got shocked when i came to know, it is wriiten by “C”. Oops !
I can not write the markers as vcs addons. I have to write it as vcs core. 
Developer encouraged me and told me, if i will wrirte new markers means he will update the CDAT source code with my code.
Now i am going to fix the bug in that circle marker.
I will try my level best.
Till now, i am not yet given back anything to open source via coding.
I hope this will become my first contribution to open source world by coding.
Regards,
Arulalan.T
Go ahead