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/*************************************************************************
** BoundingBox.cpp **
** **
** This file is part of dvisvgm -- a fast DVI to SVG converter **
** Copyright (C) 2005-2022 Martin Gieseking <martin.gieseking@uos.de> **
** **
** This program is free software; you can redistribute it and/or **
** modify it under the terms of the GNU General Public License as **
** published by the Free Software Foundation; either version 3 of **
** the License, or (at your option) any later version. **
** **
** This program is distributed in the hope that it will be useful, but **
** WITHOUT ANY WARRANTY; without even the implied warranty of **
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the **
** GNU General Public License for more details. **
** **
** You should have received a copy of the GNU General Public License **
** along with this program; if not, see <http://www.gnu.org/licenses/>. **
*************************************************************************/
#include <algorithm>
#include <sstream>
#include "BoundingBox.hpp"
#include "Matrix.hpp"
#include "utility.hpp"
#include "XMLNode.hpp"
#include "XMLString.hpp"
using namespace std;
BoundingBox::BoundingBox ()
: _ulx(0), _uly(0), _lrx(0), _lry(0), _valid(false), _locked(false)
{
}
BoundingBox::BoundingBox (double ulxx, double ulyy, double lrxx, double lryy)
: _ulx(min(ulxx,lrxx)), _uly(min(ulyy,lryy)),
_lrx(max(ulxx,lrxx)), _lry(max(ulyy,lryy)),
_valid(true), _locked(false)
{
}
BoundingBox::BoundingBox (const DPair &p1, const DPair &p2)
: _ulx(min(p1.x(), p2.x())), _uly(min(p1.y(), p2.y())),
_lrx(max(p1.x(), p2.x())), _lry(max(p1.y(), p2.y())),
_valid(true), _locked(false)
{
}
BoundingBox::BoundingBox (const Length &ulxx, const Length &ulyy, const Length &lrxx, const Length &lryy)
: _ulx(min(ulxx.bp(),lrxx.bp())), _uly(min(ulyy.bp(),lryy.bp())),
_lrx(max(ulxx.bp(),lrxx.bp())), _lry(max(ulyy.bp(),lryy.bp())),
_valid(true), _locked(false)
{
}
BoundingBox::BoundingBox (const string &boxstr)
: _ulx(0), _uly(0), _lrx(0), _lry(0), _valid(false), _locked(false)
{
set(boxstr);
}
/** Extracts a sequence of length values from a string like "5cm, 2.4in, 0pt".
* @param[in] boxstr whitespace and/or comma separated string of lengths.
* @param[out] the extracted lengths */
vector<Length> BoundingBox::extractLengths (string boxstr) {
vector<Length> lengths;
boxstr = util::replace(boxstr, ",", " ");
boxstr = util::normalize_space(boxstr);
vector<string> lengthStrings = util::split(boxstr, " ");
for (const string &lenstr : lengthStrings) {
if (!lenstr.empty())
lengths.emplace_back(lenstr);
}
return lengths;
}
/** Sets or modifies the bounding box. If 'boxstr' consists of 4 length values,
* they denote the absolute position of two diagonal corners of the box. In case
* of a single length value l the current box is enlarged by adding (-l,-l) the upper
* left and (l,l) to the lower right corner.
* @param[in] boxstr whitespace and/or comma separated string of lengths. */
void BoundingBox::set (const string &boxstr) {
vector<Length> coord = extractLengths(boxstr);
set(coord);
}
void BoundingBox::set (const std::vector<Length> &coord) {
switch (coord.size()) {
case 1:
_ulx -= coord[0].bp();
_uly -= coord[0].bp();
_lrx += coord[0].bp();
_lry += coord[0].bp();
break;
case 2:
_ulx -= coord[0].bp();
_uly -= coord[1].bp();
_lrx += coord[0].bp();
_lry += coord[1].bp();
break;
case 4:
_ulx = min(coord[0].bp(), coord[2].bp());
_uly = min(coord[1].bp(), coord[3].bp());
_lrx = max(coord[0].bp(), coord[2].bp());
_lry = max(coord[1].bp(), coord[3].bp());
break;
default:
throw BoundingBoxException("1, 2 or 4 length parameters expected");
}
_valid = true;
}
/** Enlarges the box so that point (x,y) is enclosed. */
void BoundingBox::embed (double x, double y) {
if (!_locked) {
if (_valid) {
if (x < _ulx)
_ulx = x;
else if (x > _lrx)
_lrx = x;
if (y < _uly)
_uly = y;
else if (y > _lry)
_lry = y;
}
else {
_ulx = _lrx = x;
_uly = _lry = y;
_valid = true;
}
}
}
/** Enlarges the box so that the given bounding box is enclosed. */
void BoundingBox::embed (const BoundingBox &bbox) {
if (!_locked && bbox._valid) {
if (_valid) {
embed(bbox._ulx, bbox._uly);
embed(bbox._lrx, bbox._lry);
}
else {
_ulx = bbox._ulx;
_uly = bbox._uly;
_lrx = bbox._lrx;
_lry = bbox._lry;
_valid = true;
}
}
}
/** Embeds a virtual circle into the box and enlarges it accordingly.
* @param[in] c center of the circle
* @param[in] r radius of the circle */
void BoundingBox::embed (const DPair &c, double r) {
embed(BoundingBox(c.x()-r, c.y()-r, c.x()+r, c.y()+r));
}
/** Expands the box in all four directions by a given value. */
void BoundingBox::expand (double m) {
if (!_locked) {
_ulx -= m;
_uly -= m;
_lrx += m;
_lry += m;
}
}
/** Intersects the current box with bbox and applies the result to *this.
* If both boxes are disjoint, *this is not altered.
* @param[in] bbox box to intersect with
* @return false if *this is locked or both boxes are disjoint */
bool BoundingBox::intersect (const BoundingBox &bbox) {
// check if the two boxes are disjoint
if (_locked || _lrx < bbox._ulx || _lry < bbox._uly || _ulx > bbox._lrx || _uly > bbox._lry)
return false;
// not disjoint: compute the intersection
_ulx = max(_ulx, bbox._ulx);
_uly = max(_uly, bbox._uly);
_lrx = min(_lrx, bbox._lrx);
_lry = min(_lry, bbox._lry);
return true;
}
void BoundingBox::operator += (const BoundingBox &bbox) {
if (!_locked) {
_ulx += bbox._ulx;
_uly += bbox._uly;
_lrx += bbox._lrx;
_lry += bbox._lry;
}
}
static inline bool almost_equal (double v1, double v2) {
return abs(v1-v2) < 1e-10;
}
bool BoundingBox::operator == (const BoundingBox &bbox) const {
return _valid && bbox._valid
&& almost_equal(_ulx, bbox._ulx)
&& almost_equal(_uly, bbox._uly)
&& almost_equal(_lrx, bbox._lrx)
&& almost_equal(_lry, bbox._lry);
}
void BoundingBox::scale (double sx, double sy) {
if (!_locked) {
_ulx *= sx;
_lrx *= sx;
if (sx < 0) swap(_ulx, _lrx);
_uly *= sy;
_lry *= sy;
if (sy < 0) swap(_uly, _lry);
}
}
void BoundingBox::transform (const Matrix &tm) {
if (!_locked) {
DPair ul = tm * DPair(_ulx, _uly);
DPair lr = tm * DPair(_lrx, _lry);
DPair ll = tm * DPair(_ulx, _lry);
DPair ur = tm * DPair(_lrx, _uly);
_ulx = min(min(ul.x(), lr.x()), min(ur.x(), ll.x()));
_uly = min(min(ul.y(), lr.y()), min(ur.y(), ll.y()));
_lrx = max(max(ul.x(), lr.x()), max(ur.x(), ll.x()));
_lry = max(max(ul.y(), lr.y()), max(ur.y(), ll.y()));
}
}
string BoundingBox::toSVGViewBox () const {
ostringstream oss;
oss << XMLString(_ulx) << ' ' << XMLString(_uly) << ' ' << XMLString(width()) << ' ' << XMLString(height());
return oss.str();
}
ostream& BoundingBox::write (ostream &os) const {
os << '(' << _ulx << ", " << _uly << ", " << _lrx << ", " << _lry << ')';
if (!_valid)
os << " (invalid)";
else if (_locked)
os << " (locked)";
return os;
}
unique_ptr<XMLElement> BoundingBox::createSVGRect () const {
auto rect = util::make_unique<XMLElement>("rect");
rect->addAttribute("x", minX());
rect->addAttribute("y", minY());
rect->addAttribute("width", width());
rect->addAttribute("height", height());
rect->addAttribute("fill", "none");
return rect;
}
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