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/*************************************************************************
** TpicSpecialHandler.cpp **
** **
** This file is part of dvisvgm -- the DVI to SVG converter **
** Copyright (C) 2005-2011 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 <cmath>
#include <cstring>
#include <sstream>
#include "Color.h"
#include "InputBuffer.h"
#include "InputReader.h"
#include "SpecialActions.h"
#include "TpicSpecialHandler.h"
#include "XMLNode.h"
#include "XMLString.h"
#include "types.h"
using namespace std;
TpicSpecialHandler::TpicSpecialHandler () {
reset();
}
void TpicSpecialHandler::dviEndPage () {
reset();
}
void TpicSpecialHandler::reset () {
_points.clear();
_penwidth = 1.0;
_fill = -1.0; // no fill
}
/** Creates SVG elements that draw lines through the recorded points.
* @param[in] stroke if true, the (out)line is drawn (in black)
* @param[in] fill if true, enclosed area is filled with current color
* @param[in] ddist dash/dot distance of line in TeX point units
* (0:solid line, >0:dashed line, <0:dotted line) */
void TpicSpecialHandler::drawLines (bool stroke, bool fill, double ddist, SpecialActions *actions) {
if (actions && _points.size() > 0) {
XMLElementNode *elem=0;
if (_points.size() == 1) {
const DPair &p = _points.back();
elem = new XMLElementNode("circle");
elem->addAttribute("cx", p.x()+actions->getX());
elem->addAttribute("cy", p.y()+actions->getY());
elem->addAttribute("r", _penwidth/2.0);
actions->embed(p, _penwidth/2.0);
}
else {
if (_points.size() == 2 || (!fill && _points.front() != _points.back())) {
elem = new XMLElementNode("polyline");
elem->addAttribute("fill", "none");
elem->addAttribute("stroke-linecap", "round");
}
else {
if (_points.front() == _points.back())
_points.pop_back();
if (_fill < 0)
_fill = 1;
Color color = actions->getColor();
color *= _fill;
elem = new XMLElementNode("polygon");
elem->addAttribute("fill", fill ? color.rgbString() : "none");
}
ostringstream oss;
FORALL(_points, vector<DPair>::iterator, it) {
if (it != _points.begin())
oss << ' ';
double x = it->x()+actions->getX();
double y = it->y()+actions->getY();
oss << x << ',' << y;
actions->embed(DPair(x, y));
}
elem->addAttribute("points", oss.str());
if (stroke) { // draw outline?
elem->addAttribute("stroke", "black");
elem->addAttribute("stroke-width", XMLString(_penwidth));
}
}
if (ddist > 0)
elem->addAttribute("stroke-dasharray", XMLString(ddist));
else if (ddist < 0) {
ostringstream oss;
oss << _penwidth << ' ' << -ddist;
elem->addAttribute("stroke-dasharray", oss.str());
}
actions->appendToPage(elem);
}
reset();
}
void TpicSpecialHandler::drawSplines (double ddist, SpecialActions *actions) {
if (actions && _points.size() > 0) {
const size_t size = _points.size();
if (size < 3)
drawLines(true, false, ddist, actions);
else {
double x = actions->getX();
double y = actions->getY();
DPair p(x,y);
ostringstream oss;
oss << 'M' << x+_points[0].x() << ',' << y+_points[0].y();
DPair mid = p+_points[0]+(_points[1]-_points[0])/2.0;
oss << 'L' << mid.x() << ',' << mid.y();
actions->embed(p+_points[0]);
for (size_t i=1; i < size-1; i++) {
const DPair p0 = p+_points[i-1];
const DPair p1 = p+_points[i];
const DPair p2 = p+_points[i+1];
mid = p1+(p2-p1)/2.0;
oss << 'Q' << p1.x() << ',' << p1.y()
<< ' ' << mid.x() << ',' << mid.y();
actions->embed(mid);
actions->embed((p0+p1*6.0+p2)/8.0, _penwidth);
}
if (_points[0] == _points[size-1]) // closed path?
oss << 'Z';
else {
oss << 'L' << x+_points[size-1].x() << ',' << y+_points[size-1].y();
actions->embed(p+_points[size-1]);
}
Color color = actions->getColor();
color *= _fill;
XMLElementNode *path = new XMLElementNode("path");
if (_fill >= 0) {
if (_points[0] != _points[size-1])
oss << 'Z';
path->addAttribute("fill", color.rgbString());
}
else
path->addAttribute("fill", "none");
path->addAttribute("d", oss.str());
path->addAttribute("stroke", actions->getColor().rgbString());
path->addAttribute("stroke-width", XMLString(_penwidth));
if (ddist > 0)
path->addAttribute("stroke-dasharray", XMLString(ddist));
else if (ddist < 0) {
ostringstream oss;
oss << _penwidth << ' ' << -ddist;
path->addAttribute("stroke-dasharray", oss.str());
}
actions->appendToPage(path);
}
}
reset();
}
void TpicSpecialHandler::drawArc (double cx, double cy, double rx, double ry, double angle1, double angle2, SpecialActions *actions) {
if (actions) {
const double PI2 = 4*asin(1.0);
angle1 *= -1;
angle2 *= -1;
if (fabs(angle1) > PI2) {
int n = (int) (angle1/PI2);
angle1 = angle1 - n*PI2;
angle2 = angle2 - n*PI2;
}
double x = cx + actions->getX();
double y = cy + actions->getY();
XMLElementNode *elem=0;
if (fabs(angle1-angle2) >= PI2) { // closed ellipse?
elem = new XMLElementNode("ellipse");
elem->addAttribute("cx", XMLString(x));
elem->addAttribute("cy", XMLString(y));
elem->addAttribute("rx", XMLString(rx));
elem->addAttribute("ry", XMLString(ry));
}
else {
if (angle1 < 0)
angle1 = PI2+angle1;
if (angle2 < 0)
angle2 = PI2+angle2;
elem = new XMLElementNode("path");
int large_arg = fabs(angle1-angle2) > PI2/2 ? 0 : 1;
int sweep = angle1 > angle2 ? 0 : 1;
if (angle1 > angle2) {
large_arg = 1-large_arg;
sweep = 1-sweep;
}
ostringstream oss;
oss << 'M' << x+rx*cos(angle1) << ',' << y+ry*sin(-angle1)
<< 'A' << rx << ',' << ry
<< " 0 "
<< large_arg << ' ' << sweep << ' '
<< x+rx*cos(angle2) << ',' << y-ry*sin(angle2);
if (_fill >= 0)
oss << 'Z';
elem->addAttribute("d", oss.str());
}
elem->addAttribute("stroke-width", _penwidth);
elem->addAttribute("stroke", actions->getColor().rgbString());
elem->addAttribute("stroke-linecap", "round");
elem->addAttribute("fill", "none");
if (_fill >= 0) {
Color color=actions->getColor();
color *= _fill;
elem->addAttribute("fill", color.rgbString());
}
else
elem->addAttribute("fill", "none");
actions->appendToPage(elem);
actions->embed(BoundingBox(cx-rx, cy-ry, cx+rx, cy+ry));
}
reset();
}
#define cmd_id(c1,c2) ((c1 << 8) | c2)
bool TpicSpecialHandler::process (const char *prefix, istream &is, SpecialActions *actions) {
if (!prefix || strlen(prefix) != 2)
return false;
const double PT=0.07227; // factor for milli-inch to TeX points
StreamInputBuffer ib(is);
BufferInputReader in(ib);
switch (cmd_id(prefix[0], prefix[1])) {
case cmd_id('p','n'): // set pen width in milli-inches
_penwidth = in.getDouble()*PT;
break;
case cmd_id('b','k'): // set fill color to black
_fill = 0;
break;
case cmd_id('w','h'): // set fill color to white
_fill = 1;
break;
case cmd_id('s','h'): // set fill color to given gray level
in.skipSpace();
_fill = in.eof() ? 0.5 : max(0.0, min(1.0, in.getDouble()));
break;
case cmd_id('t','x'): // set fill pattern
break;
case cmd_id('p','a'): { // add point to path
double x=in.getDouble()*PT;
double y=in.getDouble()*PT;
_points.push_back(DPair(x,y));
break;
}
case cmd_id('f','p'): // draw solid lines through recorded points; close and fill path if fill color was defined
drawLines(true, _fill >= 0, 0, actions);
break;
case cmd_id('i','p'): // don't draw outlines but close the recorded path and fill the resulting polygon
drawLines(false, true, 0, actions);
break;
case cmd_id('d','a'): // as fp but draw dashed lines
drawLines(true, _fill >= 0, in.getDouble()*72.27, actions);
break;
case cmd_id('d','t'): // as fp but draw dotted lines
drawLines(true, _fill >= 0, -in.getDouble()*72.27, actions);
break;
case cmd_id('s','p'): { // draw quadratic splines through recorded points
double ddist = in.getDouble();
drawSplines(ddist, actions);
break;
}
case cmd_id('a','r'): { // draw elliptical arc
double cx = in.getDouble()*PT;
double cy = in.getDouble()*PT;
double rx = in.getDouble()*PT;
double ry = in.getDouble()*PT;
double a1 = in.getDouble();
double a2 = in.getDouble();
drawArc(cx, cy, rx, ry, a1, a2, actions);
break;
}
case cmd_id('i','a'): { // fill elliptical arc
double cx = in.getDouble()*PT;
double cy = in.getDouble()*PT;
double rx = in.getDouble()*PT;
double ry = in.getDouble()*PT;
double a1 = in.getDouble();
double a2 = in.getDouble();
if (_fill < 0)
_fill = 1;
drawArc(cx, cy, rx, ry, a1, a2, actions);
if (_fill < 0)
_fill = -1;
break;
}
default:
return false;
}
return true;
}
const char** TpicSpecialHandler::prefixes () const {
static const char *pfx[] = {"ar", "bk", "da", "dt", "fp", "ia", "ip", "pa", "pn", "sh", "sp", "tx", "wh", 0};
return pfx;
}
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