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Improve drawing of math roots (\sqrt and \root)

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This is preliminary work to make roots look more like in TeX output:

* correct font size for root order

* set minimum size of the root from the max ascent descent of the
  font. This is what TeX does.

* fix drawing, and in particular horizontal size.

More needs to be done, in particular:

* handle zooming and dpi correctly by removing hardcoded pixel values.

* factor the code for the two types of roots in one.
This commit is contained in:
Jean-Marc Lasgouttes 2017-03-31 18:50:14 +02:00
parent da590925cd
commit 758de9577d
2 changed files with 38 additions and 15 deletions
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42
src/mathed/InsetMathRoot.cpp
View File

@ -15,6 +15,7 @@
#include "MathData.h"
#include "MathStream.h"
#include "MathSupport.h"
#include "Cursor.h"
#include "LaTeXFeatures.h"
@ -42,27 +43,44 @@ Inset * InsetMathRoot::clone() const
void InsetMathRoot::metrics(MetricsInfo & mi, Dimension & dim) const
{
Changer dummy = mi.base.changeEnsureMath();
cellsMetrics(mi);
Dimension const & dim0 = cell(0).dimension(*mi.base.bv);
Dimension const & dim1 = cell(1).dimension(*mi.base.bv);
dim.asc = max(dim0.ascent() + 5, dim1.ascent()) + 2;
dim.des = max(dim0.descent() - 5, dim1.descent()) + 2;
dim.wid = dim0.width() + dim1.width() + 10;
Dimension dim0;
{
Changer script = mi.base.font.changeStyle(LM_ST_SCRIPTSCRIPT);
cell(0).metrics(mi, dim0);
// make sure that the dim is high enough for any character
Dimension fontDim;
math_font_max_dim(mi.base.font, fontDim.asc, fontDim.des);
dim0 += fontDim;
}
Dimension dim1;
cell(1).metrics(mi, dim1);
// make sure that the dim is high enough for any character
Dimension fontDim;
math_font_max_dim(mi.base.font, fontDim.asc, fontDim.des);
dim1 += fontDim;
dim.asc = max(dim0.ascent() + 5, dim1.ascent()) + 1;
dim.des = max(dim0.descent() - 5, dim1.descent());
dim.wid = dim0.width() + dim1.width() + 4;
}
void InsetMathRoot::draw(PainterInfo & pi, int x, int y) const
{
Changer dummy = pi.base.changeEnsureMath();
Dimension const & dim0 = cell(0).dimension(*pi.base.bv);
int const w = dim0.width();
// the "exponent"
cell(0).draw(pi, x, y - 5 - dim0.descent());
// the "base"
cell(1).draw(pi, x + w + 8, y);
Dimension const dim = dimension(*pi.base.bv);
int const a = dim.ascent();
int const d = dim.descent();
Dimension const & dim0 = cell(0).dimension(*pi.base.bv);
int const w = dim0.width();
// the "exponent"
{
Changer script = pi.base.font.changeStyle(LM_ST_SCRIPTSCRIPT);
cell(0).draw(pi, x, y + (d - a)/2 - dim0.descent());
}
// the "base"
cell(1).draw(pi, x + w + 4, y);
int xp[4];
int yp[4];
pi.pain.line(x + dim.width(), y - a + 1,

11
src/mathed/InsetMathSqrt.cpp
View File

@ -14,6 +14,7 @@
#include "MathData.h"
#include "MathStream.h"
#include "MathSupport.h"
#include "LaTeXFeatures.h"
#include "MetricsInfo.h"
@ -39,9 +40,13 @@ void InsetMathSqrt::metrics(MetricsInfo & mi, Dimension & dim) const
{
Changer dummy = mi.base.changeEnsureMath();
cell(0).metrics(mi, dim);
dim.asc += 4;
dim.des += 2;
dim.wid += 12;
// make sure that the dim is high enough for any character
Dimension fontDim;
math_font_max_dim(mi.base.font, fontDim.asc, fontDim.des);
dim += fontDim;
// Some room for the decoration
dim.asc += 1;
dim.wid += 7;
}