Date: prev next · Thread: first prev next last
2019 Archives by date, by thread · List index


Hi all,

some years ago Radek Doulik has implemented a commant 'G' for the enhanced-path of a custom shape. Such path is written in drawooo namespace. I have not found any documentation about it and it is not mentioned in https://wiki.documentfoundation.org/Development/ODF_Implementer_Notes/List_of_LibreOffice_ODF_Extensions

You know, that I'm hesitant to bring something new to ODF. But in this case the new command seems to be useful. You will find the draft for a proposal below. Because the lack of any documentation (and my problems with English) it would be nice, if you look whether I have got it correct.

PowerPoint restricts the swing angle to [-360°;360°], but I do not find any such restriction in the OOXML spec. What to do for ODF about this? Currently it is not restricted in my proposal draft.

Kind regards
Regina

Proposal
========
Command     G
Name        arcangleto
Parameters  (wR hR st sw) +
Description
Draws an arc of an ellipse. The ellipse is specified by the width 2*wR, and the hight 2*hR. The arc is specifies by the start angle st in degrees and the swing angle sw in degrees. The ellipse is positioned so that the current point is the start point of the arc. The arc is drawn so that sw is the central angle of the arc. If sw is positive, the arc is drawn clockwise; if sw is negative, the arc is drawn counter-clockwise. The endpoint of the arc becomes the new current point.
In case the path is filled, the filling is drawn as ellipse sector.
The swing angle may be greater as 360° and may be smaller than -360°. In that cases filling will overlap.

Explanation
===========
This command is needed for interoperability with the OOXML standard and its attribute "arcTo", see ECMA-376 Part 1 section 20.1.94. With the current commands A, B, U, T, V and W only one direction of the arc is possible, either clockwise or counter-clockwise. The new command G allows to specify the arc direction depending on a parameter. Such parameter can be calculated from a formula or adjustment value, so the direction is not predefined.

Context


Privacy Policy | Impressum (Legal Info) | Copyright information: Unless otherwise specified, all text and images on this website are licensed under the Creative Commons Attribution-Share Alike 3.0 License. This does not include the source code of LibreOffice, which is licensed under the Mozilla Public License (MPLv2). "LibreOffice" and "The Document Foundation" are registered trademarks of their corresponding registered owners or are in actual use as trademarks in one or more countries. Their respective logos and icons are also subject to international copyright laws. Use thereof is explained in our trademark policy.