Hi all,
Attached is a patch that allows for the use of a mathematical
expression when editing the value field of components in Eeschema.
If editing the value field and the entered string begins with an
equals sign "=" as you would when entering a formula into an Excel
spreadsheet cell, it is compiled and parsed when the Enter button is
pressed while the text entry is in focus.
A valid expression is returned as a double value which is then printed
with a format to remove trailing zeroes. An invalid expression will
not change the text value.
The expression parser is simple wrap of the C++ Mathematical
Expression Toolkit Library (ExprTk) written Arash Partow and is under
the MIT licence [1].
I think this provides a template for other numerical input fields
within Kicad.
[1] http://www.partow.net/programming/exprtk/index.html
Kind Regards
Russell
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