Created attachment 147337 [details] Example with three quarter circles The command X in the enhanced-path of a custom shape geometry toggles x- and y-direction, see table 10 in section 19.145draw:enhanced-path http://docs.oasis-open.org/office/v1.2/os/OpenDocument-v1.2-os-part1.html#attribute-draw_enhanced-path PowerPoint and Karbon renders it this way, but LibreOffice uses always x-direction.
Proposed patch is in https://gerrit.libreoffice.org/#/c/65203/
Regina Henschel committed a patch related to this issue. It has been pushed to "master": https://git.libreoffice.org/core/+/a4c46ceec433edf0c5de03ea8d36857a455cafd2%5E%21 tdf#121761, tdf#121952 Accurate ellipsequadrant in custom shape It will be available in 6.3.0. The patch should be included in the daily builds available at https://dev-builds.libreoffice.org/daily/ in the next 24-48 hours. More information about daily builds can be found at: https://wiki.documentfoundation.org/Testing_Daily_Builds Affected users are encouraged to test the fix and report feedback.
See fix in Version: 6.3.0.0.alpha0+ (x64) Build ID: 49fcd3bbb30f93763fc5cb80fa6ac5cec5d00834 CPU threads: 8; OS: Windows 10.0; UI render: default; VCL: win; TinderBox: Win-x86_64@42, Branch:master, Time: 2018-12-24_22:40:25 Locale: de-DE (en_US); UI-Language: en-US Calc: threaded