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Make horizontal stretchy characters use multiple extenders rather than CSS transform. Issue #1326

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This commit is contained in:
Davide P. Cervone 2015-12-04 10:28:54 -05:00
parent 49003fe4ac
commit 206dc7f490
1 changed files with 33 additions and 40 deletions
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73
unpacked/jax/output/CommonHTML/jax.js
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@ -96,12 +96,7 @@
".mjx-prestack > .mjx-presup": {display:"block"},
".mjx-prestack > .mjx-presub": {display:"block"},
".mjx-delim-v > .mjx-char": {transform:"scale(1)"}, // for Firefox to get horizontal alignment better
".mjx-delim-h": {display:"block"},
".mjx-delim-h > .mjx-char": {
transform:"scale(1)",
display:"inline-block"
},
".mjx-delim-h > .mjx-char": {display:"inline-block"},
".mjx-surd": {"vertical-align":"top"},
@ -1026,10 +1021,10 @@
if (delim.min && H < h*delim.min) H = h*delim.min;
if (H > h) {
ebox = this.createChar(tmp,delim.ext,1,font); ext = tmp.removeChild(tmp.firstChild);
var eH = ebox.h + ebox.d, eh = eH - EFUZZ, n, N;
N = n = Math.min(Math.ceil((H-h)/(k*eh)),this.maxStretchyParts);
var eH = ebox.h + ebox.d, eh = eH - EFUZZ;
var n = Math.min(Math.ceil((H-h)/(k*eh)),this.maxStretchyParts);
if (delim.fullExtenders) H = n*k*eh + h; else eh = (H-h)/(k*n);
c = ebox.d+ebox.a-eH/2; // for centering of extenders
c = ebox.d + ebox.a - eH/2; // for centering of extenders
ext.style.margin = ext.style.padding = "";
ext.style.lineHeight = CHTML.Em(eh);
ext.style.marginBottom = CHTML.Em(c-EFUZZ/2/k);
@ -1065,64 +1060,62 @@
lbox = this.createChar(tmp,(delim.left||delim.rep),1,font); left = tmp.removeChild(tmp.firstChild);
rbox = this.createChar(tmp,(delim.right||delim.rep),1,font); right = tmp.removeChild(tmp.firstChild);
ebox = this.createChar(tmp,delim.rep,1,font); ext = tmp.removeChild(tmp.firstChild);
left.style.marginLeft = CHTML.Em(-lbox.l);
right.style.marginRight = CHTML.Em(rbox.r-rbox.w);
node.appendChild(left);
var hbox = CHTML.BBOX.zero();
hbox.h = Math.max(lbox.h,rbox.h); hbox.d = Math.max(lbox.d,rbox.d);
left.style.marginLeft = CHTML.Em(-lbox.l); left.style.marginRight = CHTML.Em(lbox.r-lbox.w);
right.style.marginleft = CHTML.Em(-rbox.l); right.style.marginRight = CHTML.Em(rbox.r-rbox.w);
var w = (lbox.r - lbox.l) + (rbox.r - rbox.l) - .05;
hbox.h = Math.max(lbox.h,rbox.h,ebox.h);
hbox.d = Math.max(lbox.D||lbox.d,rbox.D||rbox.d,ebox.D||ebox.d);
var w = (lbox.r - lbox.l) + (rbox.r - rbox.l) - EFUZZ;
if (delim.mid) {
mbox = this.createChar(tmp,delim.mid,1,font);
mid = tmp.removeChild(tmp.firstChild);
w += mbox.w; k = 2;
mid.style.marginleft = CHTML.Em(-mbox.l); mid.style.marginRight = CHTML.Em(mbox.r-mbox.w);
w += mbox.r - mbox.l + EFUZZ; k = 2;
if (mbox.h > hbox.h) hbox.h = mbox.h;
if (mbox.d > hbox.d) hbox.d = mbox.d;
}
if (delim.min && W < w*delim.min) W = w*delim.min;
right.style.marginLeft = CHTML.Em((W-w-rbox.l)/k);
hbox.w = hbox.r = W;
if (W > w) {
if (ebox.h > hbox.h) hbox.h = ebox.h;
if (ebox.d > hbox.d) hbox.d = ebox.d;
var s = (W - w)/k + .2; // space to cover by extender
s /= (ebox.r - ebox.l); // scale factor
this.Transform(ext,
"translateX("+CHTML.Em(-ebox.l-.1)+") scaleX("+s.toFixed(3).replace(/0+$/,"")+")",
CHTML.Em(ebox.l)+" center"
);
ext.style.width = 0;
var eW = ebox.r-ebox.l, ew = eW - EFUZZ;
var n = Math.min(Math.ceil((W-w)/(k*ew)),this.maxStretchyParts);
if (delim.fullExtenders) W = n*k*ew + w; else ew = (W-w)/(k*n);
var c = (eW - ew + EFUZZ/k) / 2; // for centering of extenders
ext.style.marginLeft = CHTML.Em(-ebox.l-c);
ext.style.marginRight = CHTML.Em(ebox.r-ebox.w+c);
ext.style.letterSpacing = CHTML.Em(-(ebox.w-ew));
left.style.marginRight = CHTML.Em(lbox.r-lbox.w);
right.style.marginleft = CHTML.Em(-rbox.l);
var TEXT = ext.textContent, text = TEXT;
while (--n > 0) TEXT += text;
ext.firstChild.textContent = TEXT;
node.appendChild(ext);
if (delim.mid) {
node.appendChild(mid);
mid.style.marginLeft = right.style.marginLeft;
ext2 = node.appendChild(ext.cloneNode(true));
}
} else {
if (delim.mid) {
node.appendChild(mid);
mid.style.marginLeft = CHTML.Em((W-w)/k);
}
c = (W-w-EFUZZ/k) / 2;
left.style.marginRight = CHTML.Em(lbox.r-lbox.w+c);
if (delim.mid) node.appendChild(mid);
right.style.marginLeft = CHTML.Em(-rbox.l+c);
}
node.appendChild(right);
if (ebox.D) ebox.d = ebox.D;
hbox.t = hbox.h; hbox.b = hbox.d; hbox.h = ebox.h; hbox.d = ebox.d;
this.adjustHeights([left,ext,mid,ext2,right],hbox);
var mt = ebox.h - hbox.t - ebox.a, mb = ebox.d - hbox.b + ebox.a;
if (mt) node.style.marginTop = CHTML.Em(mt);
if (mb) node.style.marginBottom = CHTML.Em(mb);
this.adjustHeights([left,ext,mid,ext2,right],[lbox,ebox,mbox,ebox,rbox],hbox);
if (BBOX) {hbox.scale = BBOX.scale; hbox.rscale = BBOX.rscale}
return hbox;
},
adjustHeights: function (nodes,bbox) {
adjustHeights: function (nodes,box,bbox) {
//
// To get alignment right in horizontal delimiters, we force all
// the elements to the same height and depth
//
var T = CHTML.Em(bbox.t), D = CHTML.Em(bbox.b);
if (bbox.d < 0) {bbox.D = bbox.d; bbox.d = 0; D = CHTML.Em(-bbox.D+bbox.b)}
var T = bbox.h, B = bbox.d;
if (bbox.d < 0) {B = -bbox.d; bbox.D = bbox.d; bbox.d = 0}
for (var i = 0, m = nodes.length; i < m; i++) if (nodes[i]) {
nodes[i].style.paddingTop = T;
nodes[i].style.paddingBottom = D;
nodes[i].style.paddingTop = CHTML.Em(T-box[i].a);
nodes[i].style.paddingBottom = CHTML.Em(B+box[i].a);
nodes[i].style.marginTop = nodes[i].style.marginBottom = 0;
}
},