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