hi!
Im extremely sorry for not furnishing all the details of my problem.
1) i have 1 image
2) i will draw a st line.
3) i will calculate the length of the line in pixels.
4) i will get the center point of the line by dividing the total length by 2.
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5) how to plot a point as you have done in the image which i had attached in the previous mail?
6) i want the center point to be pointed so that the user can know that it i the center point of the line.
how to do this in images?

7) after plotting the center point i should be able to automatically draw a circle which meets the where this line passes through the middle of the circle.

with regards!
Sethuraman R