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Support \widecheck (#1406)

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Fixes #1221.

Implemented as an upside-down version of `\widehat`.
This commit is contained in:
Ron Kok
2018-06-04 18:05:07 -07:00
committed by Kevin Barabash
parent 1e645198f7
commit 89e180c5a6
7 changed files with 35 additions and 11 deletions
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5
src/functions/accent.js
View File

@@ -209,7 +209,7 @@ defineFunction({
type: "accent",
names: [
"\\acute", "\\grave", "\\ddot", "\\tilde", "\\bar", "\\breve",
"\\check", "\\hat", "\\vec", "\\dot", "\\mathring",
"\\check", "\\hat", "\\vec", "\\dot", "\\mathring", "\\widecheck",
"\\widehat", "\\widetilde", "\\overrightarrow", "\\overleftarrow",
"\\Overrightarrow", "\\overleftrightarrow", "\\overgroup",
"\\overlinesegment", "\\overleftharpoon", "\\overrightharpoon",
@@ -223,7 +223,8 @@ defineFunction({
const isStretchy = !NON_STRETCHY_ACCENT_REGEX.test(context.funcName);
const isShifty = !isStretchy ||
context.funcName === "\\widehat" ||
context.funcName === "\\widetilde";
context.funcName === "\\widetilde" ||
context.funcName === "\\widecheck";
return new ParseNode("accent", {
type: "accent",

24
src/stretchy.js
View File

@@ -16,6 +16,7 @@ import type {DomSpan, SvgSpan} from "./domTree";
const stretchyCodePoint: {[string]: string} = {
widehat: "^",
widecheck: "ˇ",
widetilde: "~",
utilde: "~",
overleftarrow: "\u2190",
@@ -180,7 +181,8 @@ const svgSpan = function(
} {
let viewBoxWidth = 400000; // default
const label = group.value.label.substr(1);
if (utils.contains(["widehat", "widetilde", "utilde"], label)) {
if (utils.contains(["widehat", "widecheck", "widetilde", "utilde"],
label)) {
// Each type in the `if` statement corresponds to one of the ParseNode
// types below. This narrowing is required to access `grp.value.base`.
// $FlowFixMe
@@ -193,18 +195,24 @@ const svgSpan = function(
let height;
if (numChars > 5) {
viewBoxHeight = (label === "widehat" ? 420 : 312);
viewBoxWidth = (label === "widehat" ? 2364 : 2340);
// Next get the span height, in 1000 ems
height = (label === "widehat" ? 0.42 : 0.34);
pathName = (label === "widehat" ? "widehat" : "tilde") + "4";
if (label === "widehat" || label === "widecheck") {
viewBoxHeight = 420;
viewBoxWidth = 2364;
height = 0.42;
pathName = label + "4";
} else {
viewBoxHeight = 312;
viewBoxWidth = 2340;
height = 0.34;
pathName = "tilde4";
}
} else {
const imgIndex = [1, 1, 2, 2, 3, 3][numChars];
if (label === "widehat") {
if (label === "widehat" || label === "widecheck") {
viewBoxWidth = [0, 1062, 2364, 2364, 2364][imgIndex];
viewBoxHeight = [0, 239, 300, 360, 420][imgIndex];
height = [0, 0.24, 0.3, 0.3, 0.36, 0.42][imgIndex];
pathName = "widehat" + imgIndex;
pathName = label + imgIndex;
} else {
viewBoxWidth = [0, 600, 1033, 2339, 2340][imgIndex];
viewBoxHeight = [0, 260, 286, 306, 312][imgIndex];

13
src/svgGeometry.js
View File

@@ -281,6 +281,19 @@ c-1 5-5 9-11 9h-2L532 67 19 159h-2c-5 0-9-4-11-9l-5-22c-1-6 2-12 8-13z`,
widehat4: `M1181 0h2l1171 296c6 0 10 5 10 11l-2 23c-1 6-5 10
-11 10h-1L1182 67 15 340h-1c-6 0-10-4-11-10l-2-23c-1-6 4-11 10-11z`,
// widecheck paths are all inverted versions of widehat
widecheck1: `M529,159h5l519,-115c5,-1,9,-5,9,-10c0,-1,-1,-2,-1,-3l-4,-22c-1,
-5,-5,-9,-11,-9h-2l-512,92l-513,-92h-2c-5,0,-9,4,-11,9l-5,22c-1,6,2,12,8,13z`,
widecheck2: `M1181,220h2l1171,-176c6,0,10,-5,10,-11l-2,-23c-1,-6,-5,-10,
-11,-10h-1l-1168,153l-1167,-153h-1c-6,0,-10,4,-11,10l-2,23c-1,6,4,11,10,11z`,
widecheck3: `M1181,280h2l1171,-236c6,0,10,-5,10,-11l-2,-23c-1,-6,-5,-10,
-11,-10h-1l-1168,213l-1167,-213h-1c-6,0,-10,4,-11,10l-2,23c-1,6,4,11,10,11z`,
widecheck4: `M1181,340h2l1171,-296c6,0,10,-5,10,-11l-2,-23c-1,-6,-5,-10,
-11,-10h-1l-1168,273l-1167,-273h-1c-6,0,-10,4,-11,10l-2,23c-1,6,4,11,10,11z`,
// baraboveleftarrow is from glyph U+21C4 in font KaTeX AMS Regular
baraboveleftarrow: `M1 500c30.67-18 59-41.833 85-71.5s45-61.17 57-94.5h23
c15.33 0 23 .33 23 1 0 .67-5.33 12.67-16 36-16.67 34.67-39 67.33-67 98l-10 11