You can use translate() before displaying the child, giving as parameter just the offset you need. Wrap the whole with pushMatrix / popMatrix, and it should work.

Thanks for the reply!! That is a good way to know the position, but if I have to work with a lot of child, I think that may to complex and may have mistakes??

And I have know more about the getParams, and I realized that it can get the x,y position, width and height of the child. I guess I can use that information to work with.

Also, actually I want to know is there any way to split the child or the shape(svg). The final result that I have to do is..
1. I have a svg that is a chinese word, make by a lot of 8x8 square in AI, thats mean one word have a lot of paths.
2. I have to make some part of the word split out of the original position. Just like the right picture below, the four small squares are part of the last right 8x8 square of the word.



So I just want to get this result and may be the rotate angle will random every time, or randomly select different part of the word to split. Is there any easy way to do? 

Sorry that is a lot of question and I am really don't familiar with SVG files(but this is the most easy way that I can think of, if I have to work with chinese characters.)...Thank you for the help.!!

Look at the Geomerative library, I don't know it well, but I know if offers lot of ways to manipulate SVG, maybe it can help.