Difference between revisions of "User:Regina/MYDrafts4"
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== Angles in Attribute <tt>draw:transform</tt> == | == Angles in Attribute <tt>draw:transform</tt> == | ||
| − | These suggestions are all about section 19.228. (Because of the Wiki markup I skipped the characters < and >. | + | These suggestions are all about section 19.228. (Because of the Wiki markup I skipped the characters < and >). |
{| class="wikitable" | {| class="wikitable" | ||
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| No problems, but the quotation mark before 'The values' has to be removed. | | No problems, but the quotation mark before 'The values' has to be removed. | ||
|- | |- | ||
| − | | <tt | + | | <tt>rotate(rotate-angle)</tt>, specifies a rotation by <tt>rotate-angle</tt> 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. | | The orientation of the rotation is missing. I suggest not to use "clockwise" but to define it by an equivalent matrix. | ||
Suggestion: | Suggestion: | ||
| − | The value <tt | + | The value <tt>rotate(a)</tt> is equivalent to the value <tt>matrix( cos(a) sin(a) −sin(a) cos(a) 0 0)</tt>. |
|} | |} | ||
Revision as of 23:06, 8 August 2012
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). |
