lyx_mirror/src/mathed/math_rootinset.C

/*
 *  File:        math_root.C
 *  Purpose:     Implementation of the root object 
 *  Author:      Alejandro Aguilar Sierra <asierra@servidor.unam.mx> 
 *  Created:     January 1999
 *  Description: Root math object
 *
 *  Copyright: 1999 Alejandro Aguilar Sierra
 *
 *   You are free to use and modify this code under the terms of
 *   the GNU General Public Licence version 2 or later.
 */

#ifdef __GNUG__
#pragma implementation
#endif

#include "math_rootinset.h"
#include "support/LOstream.h"
#include "Painter.h"

MathRootInset::MathRootInset()
	: MathNestInset(2)
{}


MathInset * MathRootInset::clone() const
{
	return new MathRootInset(*this);
}


void MathRootInset::metrics(MathStyles st)
{
	MathNestInset::metrics(st);
	size_    = st;
	ascent_  = std::max(xcell(0).ascent()  + 5, xcell(1).ascent())  + 2;
	descent_ = std::max(xcell(1).descent() + 5, xcell(0).descent()) + 2;
	width_   = xcell(0).width() + xcell(1).width() + 10;
}


void MathRootInset::draw(Painter & pain, int x, int y)
{
	xo(x);
	yo(y);
	int const w = xcell(0).width();
	xcell(0).draw(pain, x, y - 5 - xcell(0).descent());       // the "exponent"
	xcell(1).draw(pain, x + w + 8, y);   // the "base"
	int const a = ascent();
	int const d = descent();
	int xp[5];
	int yp[5];
	xp[0] = x + width_;   yp[0] = y - a + 1;
	xp[1] = x + w + 4;    yp[1] = y - a + 1;
	xp[2] = x + w;        yp[2] = y + d;
	xp[3] = x + w - 2;    yp[3] = y + (d - a)/2 + 2;
	xp[4] = x;            yp[4] = y + (d - a)/2 + 2;
	pain.lines(xp, yp, 5, LColor::mathline);
}


void MathRootInset::write(std::ostream & os, bool fragile) const
{
	os << "\\sqrt[";
	cell(0).write(os, fragile);  
	os << "]{";
	cell(1).write(os, fragile);
	os << '}';
}


void MathRootInset::writeNormal(std::ostream & os) const
{
	os << "[root ";
	cell(1).writeNormal(os);  
	os << " ";
	cell(0).writeNormal(os);
	os << "] ";
}

bool MathRootInset::idxUp(int & idx, int & pos) const
{
	if (idx == 0)
		return false;
	idx = 0;
	pos = 0;
	return true;
}

bool MathRootInset::idxDown(int & idx, int & pos) const
{
	if (idx == 1)
		return false;
	idx = 1;
	pos = 0;
	return true;
}