ahhh, in that case...
...no, we can't tell you what your heading is by radar observation. We don't know exactly what winds you are experiencing or how much rudder trim you have on. We can tell you your true track pretty accurately, using electronic measurement. We could tell roughly what your heading is, based on current knowledge. By that I mean that ATC will have a pretty good idea of what the wind is doing from experience of observed track relative to headings given to previous aircraft in the area, but we can't assume to know your heading.
Hippy.