[Texmacs-dev] A few explanations please

[Salman Khilji]

Can someone please explain the following quantities please.  What is meant by 
logical?  What is meant by ink here?  Am I painting the folliwing picture 
correctly?

+---+
| A  |
+---+

The "+" signs refer to x1, y1, x2, y2.

The bounds of the letter A refer to x3, y3, and x4, y4.

Am I correct?


class box_rep: public abstract_struct {

public:
  SI x1, y1;    // under left corner (logical)
  SI x2, y2;    // upper right corner (logical)
  SI x3, y3;    // under left corner (ink)
  SI x4, y4;    // upper right corner (ink)