void Insert (wxSnip *snip, wxSnip *before, float x, float y)
void Insert (wxSnip *snip, float x, float y)
void Insert (wxSnip *snip, wxSnip *before)
Inserts the snip into the buffer. If before is specified, the snip will be put in a new drawing plane just in front of before; otherwise, it is put in front of all snips. If x and y are not specified, then the snip is centered in the buffer; if the buffer is being viewed, then it is cenetered with respect to the visible region, otherwise it is ceneterd with respect to the total width and height of the buffer.