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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* SVG <polygon> implementation
*
* Authors:
* Lauris Kaplinski <lauris@kaplinski.com>
* Abhishek Sharma
*
* Copyright (C) 1999-2002 Lauris Kaplinski
* Copyright (C) 2000-2001 Ximian, Inc.
*
* Released under GNU GPL v2+, read the file 'COPYING' for more information.
*/
#include "attributes.h"
#include "sp-polygon.h"
#include "display/curve.h"
#include <glibmm/i18n.h>
#include <2geom/curves.h>
#include "helper/geom-curves.h"
#include "svg/stringstream.h"
#include "xml/repr.h"
#include "document.h"
SPPolygon::SPPolygon() : SPShape() {
}
SPPolygon::~SPPolygon() = default;
void SPPolygon::build(SPDocument *document, Inkscape::XML::Node *repr) {
SPPolygon* object = this;
SPShape::build(document, repr);
object->readAttr(SPAttr::POINTS);
}
/*
* sp_svg_write_polygon: Write points attribute for polygon tag.
* pathv may only contain paths with only straight line segments
* Return value: points attribute string.
*/
static gchar *sp_svg_write_polygon(Geom::PathVector const & pathv)
{
Inkscape::SVGOStringStream os;
for (const auto & pit : pathv) {
for (Geom::Path::const_iterator cit = pit.begin(); cit != pit.end_default(); ++cit) {
if ( is_straight_curve(*cit) )
{
os << cit->finalPoint()[0] << "," << cit->finalPoint()[1] << " ";
} else {
g_error("sp_svg_write_polygon: polygon path contains non-straight line segments");
}
}
}
return g_strdup(os.str().c_str());
}
Inkscape::XML::Node* SPPolygon::write(Inkscape::XML::Document *xml_doc, Inkscape::XML::Node *repr, guint flags) {
// Tolerable workaround: we need to update the object's curve before we set points=
// because it's out of sync when e.g. some extension attrs of the polygon or star are changed in XML editor
this->set_shape();
if ((flags & SP_OBJECT_WRITE_BUILD) && !repr) {
repr = xml_doc->createElement("svg:polygon");
}
/* We can safely write points here, because all subclasses require it too (Lauris) */
/* While saving polygon element without points attribute _curve is NULL (see bug 1202753) */
if (this->_curve != nullptr) {
gchar *str = sp_svg_write_polygon(this->_curve->get_pathvector());
repr->setAttribute("points", str);
g_free(str);
}
SPShape::write(xml_doc, repr, flags);
return repr;
}
/**
* @brief Parse a double from the string passed by pointer and advance the string start.
*
* @param[in,out] p A pointer to a string (representing a piece of the `points` attribute).
* @param[out] v The parsed value.
* @return Parse status.
*/
SPPolyParseError sp_poly_get_value(char const **p, double *v)
{
while (**p != '\0' && (**p == ',' || **p == '\x20' || **p == '\x9' || **p == '\xD' || **p == '\xA')) {
(*p)++;
}
if (**p == '\0') {
return POLY_END_OF_STRING;
}
gchar *e = nullptr;
double value = g_ascii_strtod(*p, &e);
if (e == *p) {
return POLY_INVALID_NUMBER;
}
if (std::isnan(value)) {
return POLY_NOT_A_NUMBER;
}
if (std::isinf(value)) {
return POLY_INFINITE_VALUE;
}
*p = e;
*v = value;
return POLY_OK;
}
/**
* @brief Print a warning message related to the parsing of a 'points' attribute.
*/
static void sp_poly_print_warning(char const *points, char const *error_location, SPPolyParseError error)
{
switch (error) {
case POLY_END_OF_STRING: // Unexpected end of string!
{
size_t constexpr MAX_DISPLAY_SIZE = 64;
Glib::ustring s{points};
if (s.size() > MAX_DISPLAY_SIZE) {
s = "... " + s.substr(s.size() - MAX_DISPLAY_SIZE);
}
g_warning("Error parsing a 'points' attribute: string ended unexpectedly!\n\t\"%s\"", s.c_str());
break;
}
case POLY_INVALID_NUMBER:
g_warning("Invalid number in the 'points' attribute:\n\t\"(...) %s\"", error_location);
break;
case POLY_INFINITE_VALUE:
g_warning("Infinity is not allowed in the 'points' attribute:\n\t\"(...) %s\"", error_location);
break;
case POLY_NOT_A_NUMBER:
g_warning("NaN-value is not allowed in the 'points' attribute:\n\t\"(...) %s\"", error_location);
break;
case POLY_OK:
default:
break;
}
}
/**
* @brief Parse a 'points' attribute, printing a warning when an error occurs.
*
* @param points The points attribute.
* @return The corresponding polyline curve (open).
*/
SPCurve sp_poly_parse_curve(char const *points)
{
SPCurve result;
char const *cptr = points;
bool has_pt = false;
while (true) {
double x, y;
if (auto error = sp_poly_get_value(&cptr, &x)) {
// If the error is something other than end of input, we must report it.
// End of input is allowed when scanning for the next x coordinate: it
// simply means that we have reached the end of the coordinate list.
if (error != POLY_END_OF_STRING) {
sp_poly_print_warning(points, cptr, error);
}
break;
}
if (auto error = sp_poly_get_value(&cptr, &y)) {
// End of input is not allowed when scanning for y.
sp_poly_print_warning(points, cptr, error);
break;
}
if (has_pt) {
result.lineto(x, y);
} else {
result.moveto(x, y);
has_pt = true;
}
}
return result;
}
void SPPolygon::set(SPAttr key, const gchar* value) {
switch (key) {
case SPAttr::POINTS: {
if (!value) {
/* fixme: The points attribute is required. We should handle its absence as per
* http://www.w3.org/TR/SVG11/implnote.html#ErrorProcessing. */
break;
}
auto curve = sp_poly_parse_curve(value);
curve.closepath();
setCurve(std::move(curve));
break;
}
default:
SPShape::set(key, value);
break;
}
}
const char* SPPolygon::typeName() const {
return "path";
}
gchar* SPPolygon::description() const {
return g_strdup(_("<b>Polygon</b>"));
}
/*
Local Variables:
mode:c++
c-file-style:"stroustrup"
c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
indent-tabs-mode:nil
fill-column:99
End:
*/
// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4 :
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