User:Regina/MYDrafts4

Problems With Angle Definitions in ODF1.2

Coordinate System

There are two common ways to orientate a Cartesian coordinate system

mathematical orientation	Bild
screen orientation	Bild

Only when the orientation is determined, terms like "clockwise" are unambigious. Such orientation rule is missing in ODF 1.2.

Suggestion:

If a rule refers to a two-dimensional coordinate system, a Cartesian coordinate system in screen orientation (see figure ##) is used. The directions "clockwise", "counter clockwise", and the edge descriptions "left", "top", "right" and "button" are accordingly defined as shown in figures [##] to [##].

clockwise	Bild
counter clockwise	Bild
left, top, right, bottom	Bild

Angles in Attribute draw:transform

These suggestions are all about section 19.228. (Because of the Wiki markup I skipped the characters < and >).

Original	Problems and Suggestions
	The whole original text is very near to SVG section 7, but a reference is missing.
matrix(a b c d e f), specifies a transformation in the form of a transformation matrix of six values. "The values describe...	No problems, but the quotation mark before 'The values' has to be removed.
rotate(rotate-angle), specifies a rotation by rotate-angle degrees about the origin of the shapes coordinate system.	The orientation of the rotation is missing. I suggest not to use "clockwise" but to define it by an equivalent matrix. Suggestion: The value rotate(a) is equivalent to the value matrix( cos(a) sin(a) −sin(a) cos(a) 0 0).
scale( sx [ sy ]), specifies a scale operation by sx and sy.	"scale operation" is acceptable, but I suggest give the equivalent matrix here too, to make it uniform. Suggestion: The value scale( s ) is equivalent to the value matrix( s 0 0 s 0 0). The value scale( sx sy ) is equivalent to the value matrix( sx 0 0 sy 0 0).