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RFC and some doubts about crop guide overlays

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RFC and some doubts about crop guide overlays Nelson A. de Oliveira 25 Apr 03:05
Nelson A. de Oliveira
2009-04-25 03:05:05 UTC (almost 16 years ago)

RFC and some doubts about crop guide overlays

Hi!

I would like to have some comments/suggestions/criticisms/etc about the quality and the implementation of the following crop guide overlays.
This is related with http://bugzilla.gnome.org/show_bug.cgi?id=575911

Please, consider them as proof of concept; also, I am only including the relevant part of the code.

First the easy one: a rule of fifths (more info about the rule of fifths at http://markhancock.blogspot.com/2006/03/address-basic-composition.html)

Code is available at http://naoliv.googlepages.com/gimp-fifhts.txt

Can it be implemented in a better way, optimized, etc?

Now about the other overlays, like this golden triangle overlay: http://naoliv.googlepages.com/gimp-triangle.txt

This is the code to represent http://pendery.org/files/other%20images/Techniques%20-%20Lightroom/Triangle.png (that is the pink lines from
http://www.corel.com/img/content/community/tips/px/2007-03d/Divine_Proportion_Final_1.jpg).

Can I use "phi" as I am using now or can I define it like SQRT5 is already defined?

Also, it will be necessary to flip it vertically and horizontally (like it's possible to see at
http://www.corel.com/img/content/community/tips/px/2007-03d/Divine_Proportion_Final_0.jpg). Any hints how can I do this, please?

Is it possible to draw lines with different colors? (like http://www.corel.com/img/content/community/tips/px/2007-03d/Divine_Proportion_Final_1.jpg)

Thank you very much!

Best regards, Nelson