kicad-developers team mailing list archive

[Russell Oliver <roliver8143@xxxxxxxxx>]

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

Attachment: 0001-Proof-of-concept-of-mathematical-expression-input-fo.patch
Description: Binary data