lyx_mirror/src/mathed/InsetMathRoot.cpp
Enrico Forestieri 195b928f92 Fix bug #3294
2021-02-27 14:49:55 +01:00

250 lines
6.4 KiB
C++

/**
* \file InsetMathRoot.cpp
* This file is part of LyX, the document processor.
* Licence details can be found in the file COPYING.
*
* \author Alejandro Aguilar Sierra
* \author André Pönitz
*
* Full author contact details are available in file CREDITS.
*/
#include <config.h>
#include "InsetMathRoot.h"
#include "MathStream.h"
#include "MathSupport.h"
#include "Cursor.h"
#include "LaTeXFeatures.h"
#include "MetricsInfo.h"
#include "frontends/Painter.h"
#include "support/lassert.h"
#include "support/lstrings.h"
using namespace std;
namespace lyx {
using namespace frontend;
InsetMathRoot::InsetMathRoot(Buffer * buf)
: InsetMathNest(buf, 2)
{}
Inset * InsetMathRoot::clone() const
{
return new InsetMathRoot(*this);
}
void mathed_root_metrics(MetricsInfo & mi, MathData const & nucleus,
MathData const * root, Dimension & dim)
{
Changer dummy = mi.base.changeEnsureMath();
Dimension dimr;
if (root) {
Changer script = mi.base.font.changeStyle(SCRIPTSCRIPT_STYLE);
// make sure that the dim is high enough for any character
root->metrics(mi, dimr, false);
}
Dimension dimn;
nucleus.metrics(mi, dimn);
// Some room for the decoration
// The width of left decoration was 9 pixels with a 10em font
int const w = 9 * mathed_font_em(mi.base.font) / 10;
/* See rule 11 in Appendix G of Rhe TeXbook for the computation of the spacing
* above nucleus.
* FIXME more work is needed to implement properly rule 11.
* * Ideally, we should use sqrt glyphs from the math fonts. Note
that then we would get rule thickness from there.
* * The positioning of the root MathData is arbitrary. It should
* follow the definition of \root...\of... in The Texbook in
* Apprendix B page 360.
*
*/
int const t = mi.base.solidLineThickness();
int const x_height = mathed_font_x_height(mi.base.font);
int const phi = (mi.base.font.style() == DISPLAY_STYLE) ? x_height : t;
// first part is the spacing, second part is the line width
// itself, and last one is the spacing above.
int const space_above = (t + phi / 4) + t + t;
int const a = dimn.ascent();
int const d = dimn.descent();
// Not sure what the 1 stands for, it is needed to have some spacing at small sizes.
dim.asc = max(dimr.ascent() + (d - a) / 2, a + space_above) + 1;
dim.des = max(dimr.descent() - (d - a) / 2, d);
dim.wid = max(dimr.width() + 3 * w / 8, w) + dimn.width();
}
void InsetMathRoot::metrics(MetricsInfo & mi, Dimension & dim) const
{
mathed_root_metrics(mi, cell(0), &cell(1), dim);
}
void mathed_draw_root(PainterInfo & pi, int x, int y, MathData const & nucleus,
MathData const * root, Dimension const & dim)
{
Changer dummy = pi.base.changeEnsureMath();
// The width of left decoration was 9 pixels with a 10em font
int const w = 9 * mathed_font_em(pi.base.font) / 10;
// the height of the hook was 5 with a 10em font
int const h = 5 * mathed_font_em(pi.base.font) / 10;
int const a = dim.ascent();
int const d = dim.descent();
int const t = pi.base.solidLineThickness();
Dimension const & dimn = nucleus.dimension(*pi.base.bv);
// the width of the left part of the root
int const wl = dim.width() - dimn.width();
// the "exponent"
if (root) {
Changer script = pi.base.font.changeStyle(SCRIPTSCRIPT_STYLE);
Dimension const & dimr = root->dimension(*pi.base.bv);
int const root_offset = wl - 3 * w / 8 - dimr.width();
root->draw(pi, x + root_offset, y + (d - a)/2);
}
// the "base"
nucleus.draw(pi, x + wl, y);
int xp[4];
int yp[4];
pi.pain.line(x + dim.width(), y - a + 2 * t,
x + wl, y - a + 2 * t, pi.base.font.color(),
Painter::line_solid, t);
xp[0] = x + wl; yp[0] = y - a + 2 * t + 1;
xp[1] = x + wl - w / 2; yp[1] = y + d;
xp[2] = x + wl - w + h / 4; yp[2] = y + d - h;
xp[3] = x + wl - w; yp[3] = y + d - h + h / 4;
pi.pain.lines(xp, yp, 4, pi.base.font.color(),
Painter::fill_none, Painter::line_solid, t);
}
void InsetMathRoot::draw(PainterInfo & pi, int x, int y) const
{
mathed_draw_root(pi, x, y, cell(0), &cell(1), dimension(*pi.base.bv));
}
void InsetMathRoot::write(TeXMathStream & os) const
{
MathEnsurer ensurer(os);
if (os.latex() && !cell(1).empty() && !cell(1).front()->asBraceInset()
&& support::contains(asString(cell(1)), '['))
os << "\\sqrt[{" << cell(1) << "}]{" << cell(0) << '}';
else
os << "\\sqrt[" << cell(1) << "]{" << cell(0) << '}';
}
void InsetMathRoot::normalize(NormalStream & os) const
{
os << "[root " << cell(1) << ' ' << cell(0) << ']';
}
bool InsetMathRoot::idxUpDown(Cursor & cur, bool up) const
{
idx_type const target = up; //up ? 1 : 0;
if (cur.idx() == target)
return false;
cur.idx() = target;
cur.pos() = up ? cur.lastpos() : 0;
return true;
}
bool InsetMathRoot::idxForward(Cursor & cur) const
{
// nucleus is 0 and is on the right
if (cur.idx() == 0)
return false;
cur.idx() = 0;
cur.pos() = 0;
return true;
}
bool InsetMathRoot::idxBackward(Cursor & cur) const
{
// nucleus is 0 and is on the right
if (cur.idx() == 1)
return false;
cur.idx() = 1;
cur.pos() = cur.lastpos();
return true;
}
bool InsetMathRoot::idxFirst(Cursor & cur) const
{
LASSERT(&cur.inset() == this, return false);
cur.idx() = 1;
cur.pos() = 0;
return true;
}
bool InsetMathRoot::idxLast(Cursor & cur) const
{
LASSERT(&cur.inset() == this, return false);
cur.idx() = 0;
cur.pos() = cur.lastpos();
return true;
}
void InsetMathRoot::maple(MapleStream & os) const
{
os << '(' << cell(0) << ")^(1/(" << cell(1) <<"))";
}
void InsetMathRoot::mathematica(MathematicaStream & os) const
{
os << '(' << cell(0) << ")^(1/(" << cell(1) <<"))";
}
void InsetMathRoot::octave(OctaveStream & os) const
{
os << '(' << cell(0) << ")^(1/(" << cell(1) <<"))";
}
void InsetMathRoot::mathmlize(MathMLStream & ms) const
{
ms << MTag("mroot") << cell(0) << cell(1) << ETag("mroot");
}
void InsetMathRoot::htmlize(HtmlStream & os) const
{
os << MTag("span", "class='root'")
<< MTag("sup") << cell(1) << ETag("sup")
<< from_ascii("&radic;")
<< MTag("span", "class='rootof'") << cell(0) << ETag("span")
<< ETag("span");
}
void InsetMathRoot::validate(LaTeXFeatures & features) const
{
if (features.runparams().math_flavor == OutputParams::MathAsHTML)
features.addCSSSnippet(
"span.rootof{border-top: thin solid black;}\n"
"span.root sup{font-size: 75%;}");
InsetMathNest::validate(features);
}
} // namespace lyx