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/*************************************************************************
** BoundingBox.cpp **
** **
** This file is part of dvisvgm -- the DVI to SVG converter **
** Copyright (C) 2005-2012 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 <string>
#include "BoundingBox.h"
#include "Matrix.h"
#include "XMLNode.h"
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.pt(),lrxx.pt())), uly(min(ulyy.pt(),lryy.pt())),
lrx(max(ulxx.pt(),lrxx.pt())), lry(max(ulyy.pt(),lryy.pt())),
_valid(true), _locked(false)
{
}
/** Removes leading and trailing whitespace from the given string. */
static string& strip (string &str) {
size_t n=0;
while (n < str.length() && isspace(str[n]))
++n;
str.erase(0, n);
n=str.length()-1;
while (n > 0 && isspace(str[n]))
--n;
str.erase(n+1);
return str;
}
/** 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 (string boxstr) {
vector<Length> coord;
const size_t len = boxstr.length();
size_t l=0;
strip(boxstr);
string lenstr;
do {
while (l < len && isspace(boxstr[l]))
l++;
size_t r=l;
while (r < len && !isspace(boxstr[r]) && boxstr[r] != ',')
r++;
lenstr = boxstr.substr(l, r-l);
if (!lenstr.empty()) {
coord.push_back(Length(lenstr));
if (boxstr[r] == ',')
r++;
l = r;
}
} while (!lenstr.empty() && coord.size() < 4);
switch (coord.size()) {
case 1:
ulx -= coord[0].pt();
uly -= coord[0].pt();
lrx += coord[0].pt();
lry += coord[0].pt();
break;
case 2:
ulx -= coord[0].pt();
uly -= coord[1].pt();
lrx += coord[0].pt();
lry += coord[1].pt();
break;
case 4:
ulx = min(coord[0].pt(), coord[2].pt());
uly = min(coord[1].pt(), coord[3].pt());
lrx = max(coord[0].pt(), coord[2].pt());
lry = max(coord[1].pt(), coord[3].pt());
break;
default:
throw BoundingBoxException("1, 2 or 4 length parameters expected");
}
}
/** 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 box bb is enclosed. */
void BoundingBox::embed (const BoundingBox &bb) {
if (!_locked && bb._valid) {
if (_valid) {
embed(bb.ulx, bb.uly);
embed(bb.lrx, bb.lry);
}
else {
ulx = bb.ulx;
uly = bb.uly;
lrx = bb.lrx;
lry = bb.lry;
_valid = true;
}
}
}
void BoundingBox::embed (const DPair &c, double r) {
embed(BoundingBox(c.x()-r, c.y()-r, c.x()+r, c.y()+r));
}
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) {
if (_locked || lrx < bbox.ulx || lry < bbox.uly || ulx > bbox.lrx || uly > bbox.lry)
return false;
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 &bb) {
if (!_locked) {
ulx += bb.ulx;
uly += bb.uly;
lrx += bb.lrx;
lry += bb.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(lrx, lry);
DPair lr = tm * DPair(ulx, uly);
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 << ulx << ' ' << uly << ' ' << width() << ' ' << height();
return oss.str();
}
ostream& BoundingBox::write (ostream &os) const {
return os << '(' << ulx << ", " << uly
<< ", " << lrx << ", " << lry << ')';
}
XMLElementNode* BoundingBox::toSVGRect () const {
XMLElementNode *rect = new XMLElementNode("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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