Dashboard for collecting, where ODF and LibeOffice differ in regard to angles.
Angles in ODF
It is in 18.3.1 angle.
An angle, as defined in §4.1 of [SVG]. An angle is a double value that may be followed immediately by one of the following angle unit identifiers: deg (degrees), grad (gradiants) or rad (radians). If no unit identifier is specified, the value is assumed to be in degrees.
Note: OpenDocument v1.1 did not support angle specifications that contain an angle unit identifier. Angle unit identifiers should be omitted for compatibility with OpenDocument v1.1.
angleis defined as reference to SVG. The default degrees is a problem for LibreOffice, because it uses radians in most cases. Idea: Introduce a datatype "draw-angle" with default radians.
- The Note is misleading. Better: If compatibility to OpenDocument v1.1 is desired, then unit identifiers should be omitted.
- Only referencing SVG hides the problem of orientation of angles.
- The attribute 20.77 dr3d:end-angle refers to 18.3.1 for its angle. But in LibreOffice this angle is neither degrees nor radians, but it is 1/10 degree in content, but without unit.
- The attributes draw:start-angle and draw:end-angle (from circle sector) refer to 18.3.1. and they are used in degree without unit.
- draw:transform="rotate(0.523598775598299)" is interpreted as counterclockwise in regard to UI in LibreOffice and as clockwise in regard to UI in Powerpoint. The users sees 30° for rotation in PowerPoint and in LibreOffice as well.
In 19.171 draw:formula
sin(n) returns the trigonometric sine of n, where n is an angle specified in degrees
cos(n) returns the trigonometric cosine of n, where n is an angle specified in degrees
tan(n) returns the trigonometric tangent of n, where n is an angle specified in degrees
atan(n) returns the arc tangent of n in degrees
atan2(x,y) returns the angle in degrees of the vector (x,y) with the x-axis
LibreOffice uses radians in all cases.