I've moved your post into the correct part of the forum (english version).
Unfortunetly there is no pixel mapping function in dot2. You can check this thread from the past for some more information: Pixelmapping
With clever selection and the Groups, Blocks and Wings functions of the effect engine you should be able to run some nice effects on your LED strips, but for real pixelmapping you need an additional tool.
Some people use Arkaos and I've heard also about some happy users of MADRIX. Check what fulfills your needs!