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Explicitly specify behavior of baseline property in the presence of textangle property #112

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Explicitly specify behavior of baseline property in the presence of textangle property #112

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0c43848
Specify baseline behavior in case of non-zero textangle
p12tic Apr 21, 2022
bd774e6
Fix typo in textangle definition
p12tic Apr 21, 2022
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23 changes: 20 additions & 3 deletions 1.2/spec.md
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Expand Up @@ -587,8 +587,25 @@ This property applies primarily to textlines.
The baseline is described by a polynomial of order `n` with the coefficients
`pn ... p0` with `n = 1` for a linear (i.e. straight) line.

The polynomial is in the coordinate system of the line, with the bottom left of
the bounding box as the origin.
The polynomial is in coordinate system which depends on the `textangle` value
that is effective for the element. The coordinate system is defined as follows:

* if `textangle` property is not present or has value in ranges `[315, 360]` or
`[0, 45)`, then the origin is the bottom left of the bounding box. The x-axis
and the y-axis are the same as the x-axis and the y-axis of the document image
respectively.

* if `textangle` property has value in range `[45, 135)` then the origin is the
bottom right of the bounding box. The x-axis is the opposite as the y-axis
of the document image, y-axis is the same as the x-axis of the document image.

* if `textangle` property has value in range `[135, 225)` then the origin is the
top right of the bounding box. The x-axis and the y-axis are the opposite of
the x-axis and the y-axis of the document image respectively.

* if `textangle` property has value in range `[225, 315)` then the origin is the
top left of the bounding box. The x-axis is the same as the y-axis
of the document image, y-axis is the opposite of the x-axis of the document image.

<div class="example">

Expand Down Expand Up @@ -827,7 +844,7 @@ The <dfn property>textangle</dfn> property {#textangle}

<pre class="include">path: include/defs/textangle</pre>

The angle in degrees by which textual content has been rotate relative to the
The angle in degrees by which textual content has been rotated relative to the
rest of the page (if not present, the angle is assumed to be zero); rotations
are counter-clockwise, so an angle of 90 degrees is vertical text running from
bottom to top in Latin script; note that this is different from reading order,
Expand Down