Mark Overlapping Contours

[malcolm]

Hi
I have been asked if I can provide a script that will mark glyphs that have overlapping contours.
I know there is a method in Glyphs to remove overlap but how can I just check if a glyph has overlapping contours?

thanks

[Georg Seifert (FontLab)]

You can make a copy of the outlines and remove overlap. If the outline changes then there was a overlap.

Georg

[malcolm]

Thanks George.

I made a duplicate and removed the overlap. Compared the number of contours in each glyph and if different marked the original. I then deleted the duplicate. It works nicely.

cheers
Malcolm

[Eigi]

Hello,

as you can see, this works not in any case:


In both cases you have two contours!

Eigi

[malcolm]

Thanks Eigi, quite right.

I now include a check on the number of nodes also. This seems to work ok.
Do you think there may be a case where number of contours and number of nodes are going to be the same after removing overlap?

Malcolm

[Georg Seifert (FontLab)]

It is quite easy to even compare all nodes’ coordinates iv you want to be save.

I generate a "hash" from the outlines like this M12,34L34,50C34,70,50,80,70,80 ... (M = move point, L = line point, C = curve point, plus the coordinates) Then you compare the strings.

[Tags:]

Jump to: Please select a destination: ----------------------------- News and announcements ----------------------------- => Announcements from the forum’s moderators => News from the font industry ----------------------------- Type design and font technology ----------------------------- => Principles of type design => OpenType Layout feature development => Hinting => Font Formats and OpenType => Web font embedding => Font licensing ===> Electronic EULA Abstract (EEULAA) ----------------------------- Education and collaboration ----------------------------- => Work: Offers => Work: Looking for => Education: Offers => Education: Looking for => Typographic Events and Conferences ----------------------------- FontLab products ----------------------------- => News from FontLab => FontLab Studio ===> FontLab Studio Problems ===> FontLab Studio Tips and Tricks ===> FontLab Studio Wish List ===> FontLab Studio Public Preview => Fontographer ===> Fontographer Problems ===> Fontographer Wish List => TypeTool => AsiaFont Studio => TransType => ScanFont => SigMaker => Other Products ----------------------------- Photofont products ----------------------------- => BitFonter => Photofont WebReady => Photofont Start => Photofont ID => Photofont QX => The Photofont technology ----------------------------- Adobe Type products ----------------------------- => Adobe FDK for OpenType (AFDKO) ----------------------------- Apple Font products ----------------------------- => Apple Font Tools ----------------------------- Microsoft Typography products ----------------------------- => Microsoft Font Validator => Microsoft Visual OpenType Layout Tool (VOLT) => Microsoft Web Embedding Fonts Tool (WEFT) => Microsoft Visual TrueType (VTT) ----------------------------- Other products and Python scripting ----------------------------- => Python scripting => FontTools/TTX => Other font-related tools ----------------------------- Special interest groups ----------------------------- => SBL Fonts ===> SBL Hebrew ===> SBL Greek ===> SBL BibLit ----------------------------- FAQ and TechNotes ----------------------------- => OpenType Layout feature development FAQ and TechNotes => Hinting FAQ and TechNotes => Font Formats and OpenType FAQ and TechNotes => Web font embedding FAQ and TechNotes => Font licensing FAQ and TechNotes => FontLab Studio FAQ and TechNotes => Fontographer FAQ and TechNotes => TypeTool FAQ and TechNotes => AsiaFont Studio FAQ and TechNotes => TransType FAQ and TechNotes => ScanFont FAQ and TechNotes => SigMaker FAQ and TechNotes => BitFonter FAQ and TechNotes => Photofont WebReady FAQ and TechNotes => Photofont Start FAQ and TechNotes => Photofont ID FAQ and TechNotes => Photofont QX FAQ and TechNotes ----------------------------- Archive (MSN Groups) ----------------------------- => Archive: Old FontLab forum ===> Archive: FontLab Tips and Tricks ===> Archive: FontLab Bugs and Problems ===> Archive: FontLab Wish List ===> Archive: FontLab Announcements => Archive: Old Microsoft Font Validator group => Archive: Old Microsoft VOLT group => Archive: Old Microsoft VTT group ===> Archive: VTT Downloads ===> Archive: VTT Support ===> Archive: VTT Suggestions => Archive: Old Microsoft WEFT group ===> Archive: WEFT III ===> Archive: EOT for Email => Archive: Old SBL Fonts group ===> Archive: SBL Hebrew ===> Archive: SBL Greek ----------------------------- Various ----------------------------- => fontlab.com — the FontLab website => forum.fontlab.com — this forum => Other Topics