Summary:
Add support for math-mode accents. This involves a couple changes.
First, in order to correctly position the accents, we must know the kern between
every character and the "skewchar" in that font. To do this, we improve our tfm
parser to run the mini-kern-language and calculate kerns. We then export these
into fontMetrics.js.
Then, we add normal support for accents. In particular, we do some special
handling for supsubs around accents. This involves building the supsub
separately without the accent, and then replacing its base with the built
accent.
Finally, the character in the fonts for the \vec command is a combining unicode
character, so it is shifted to the left, but none of the other characters do
this. We add some special handling for \vec to account for this.
Fixes#7
Test Plan:
- Make sure tests pass
- Make sure no huxley screenshots changed, and the new one looks good
Reviewers: alpert
Reviewed By: alpert
Differential Revision: http://phabricator.khanacademy.org/D13157
Summary:
The `\dots` and `\dots{c,o,b,i,m}` commands do more than just show characters,
they add extra space and `\dots` also looks ahead to determine what kind of
environment it is in (see [this math.sx post]
(http://tex.stackexchange.com/questions/122491/difference-of-the-dots)). We
can't support that yet, so remove them.
Also, add comments to the extract_ttf script to show what caracters we are
extracting metrics for.
Test Plan: - Make sure tests work
Reviewers: alpert
Reviewed By: alpert
Differential Revision: http://phabricator.khanacademy.org/D13151
Summary:
Upon switching over from ttf metrics to TeX metrics, we lost metrics for a
couple of the characters that are dynamically generated by TeX. Thus TeX doesn't
have metrics for them, but our fonts do have the characters because the MathJax
scripts also dynamically build them. This adds the ability to extract metrics
from the generated font files so that we can use the generated characters
correctly. A better solution would be to dynamically generate the characters
ourselves, but that is much harder, and will be left to a future time.
Test Plan:
- Make sure typing "\neq \cong \text{ }" produces no warnings in the console.
- Make sure huxley screenshots look the same
Reviewers: alpert
Reviewed By: alpert
Differential Revision: http://phabricator.khanacademy.org/D13107
