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#define __SP_POLYGON_C__
/*
* SVG <polygon> implementation
*
* Authors:
* Lauris Kaplinski <lauris@kaplinski.com>
*
* Copyright (C) 1999-2002 Lauris Kaplinski
* Copyright (C) 2000-2001 Ximian, Inc.
*
* Released under GNU GPL, read the file 'COPYING' for more information
*/
#include "config.h"
#include "attributes.h"
#include "sp-polygon.h"
#include "display/curve.h"
#include <glibmm/i18n.h>
#include "libnr/n-art-bpath.h"
#include "svg/stringstream.h"
#include "xml/repr.h"
#include "document.h"
static void sp_polygon_class_init(SPPolygonClass *pc);
static void sp_polygon_init(SPPolygon *polygon);
static void sp_polygon_build(SPObject *object, SPDocument *document, Inkscape::XML::Node *repr);
static Inkscape::XML::Node *sp_polygon_write(SPObject *object, Inkscape::XML::Node *repr, guint flags);
static gchar *sp_polygon_description(SPItem *item);
static SPShapeClass *parent_class;
GType sp_polygon_get_type(void)
{
static GType type = 0;
if (!type) {
GTypeInfo info = {
sizeof(SPPolygonClass),
0, // base_init
0, // base_finalize
(GClassInitFunc)sp_polygon_class_init,
0, // class_finalize
0, // class_data
sizeof(SPPolygon),
0, // n_preallocs
(GInstanceInitFunc)sp_polygon_init,
0 // value_table
};
type = g_type_register_static(SP_TYPE_SHAPE, "SPPolygon", &info, static_cast<GTypeFlags>(0));
}
return type;
}
static void sp_polygon_class_init(SPPolygonClass *pc)
{
SPObjectClass *sp_object_class = (SPObjectClass *) pc;
SPItemClass *item_class = (SPItemClass *) pc;
parent_class = (SPShapeClass *) g_type_class_ref(SP_TYPE_SHAPE);
sp_object_class->build = sp_polygon_build;
sp_object_class->write = sp_polygon_write;
sp_object_class->set = sp_polygon_set;
item_class->description = sp_polygon_description;
}
static void sp_polygon_init(SPPolygon */*polygon*/)
{
/* Nothing here */
}
static void sp_polygon_build(SPObject *object, SPDocument *document, Inkscape::XML::Node *repr)
{
if (((SPObjectClass *) parent_class)->build) {
((SPObjectClass *) parent_class)->build(object, document, repr);
}
sp_object_read_attr(object, "points");
}
/*
* sp_svg_write_polygon: Write points attribute for polygon tag.
* @bpath:
*
* Return value: points attribute string.
*/
static gchar *sp_svg_write_polygon(const NArtBpath *bpath)
{
g_return_val_if_fail(bpath != NULL, NULL);
Inkscape::SVGOStringStream os;
for (int i = 0; bpath[i].code != NR_END; i++) {
switch (bpath [i].code) {
case NR_LINETO:
case NR_MOVETO:
case NR_MOVETO_OPEN:
os << bpath [i].x3 << "," << bpath [i].y3 << " ";
break;
case NR_CURVETO:
default:
g_assert_not_reached();
}
}
return g_strdup(os.str().c_str());
}
static Inkscape::XML::Node *sp_polygon_write(SPObject *object, Inkscape::XML::Node *repr, guint flags)
{
SPShape *shape = SP_SHAPE(object);
// 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
sp_shape_set_shape(shape);
if ((flags & SP_OBJECT_WRITE_BUILD) && !repr) {
Inkscape::XML::Document *xml_doc = sp_document_repr_doc(SP_OBJECT_DOCUMENT(object));
repr = xml_doc->createElement("svg:polygon");
}
/* We can safely write points here, because all subclasses require it too (Lauris) */
NArtBpath const * abp = shape->curve->get_bpath();
gchar *str = sp_svg_write_polygon(abp);
repr->setAttribute("points", str);
g_free(str);
if (((SPObjectClass *) (parent_class))->write) {
((SPObjectClass *) (parent_class))->write(object, repr, flags);
}
return repr;
}
static gboolean polygon_get_value(gchar const **p, gdouble *v)
{
while (**p != '\0' && (**p == ',' || **p == '\x20' || **p == '\x9' || **p == '\xD' || **p == '\xA')) {
(*p)++;
}
if (*p == '\0') {
return false;
}
gchar *e = NULL;
*v = g_ascii_strtod(*p, &e);
if (e == *p) {
return false;
}
*p = e;
return true;
}
void sp_polygon_set(SPObject *object, unsigned int key, const gchar *value)
{
SPPolygon *polygon = SP_POLYGON(object);
switch (key) {
case SP_ATTR_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;
}
SPCurve *curve = new SPCurve();
gboolean hascpt = FALSE;
gchar const *cptr = value;
bool has_error = false;
while (TRUE) {
gdouble x;
if (!polygon_get_value(&cptr, &x)) {
break;
}
gdouble y;
if (!polygon_get_value(&cptr, &y)) {
/* fixme: It is an error for an odd number of points to be specified. We
* should display the points up to now (as we currently do, though perhaps
* without the closepath: the spec isn't quite clear on whether to do a
* closepath or not, though I'd guess it's best not to do a closepath), but
* then flag the document as in error, as per
* http://www.w3.org/TR/SVG11/implnote.html#ErrorProcessing.
*
* (Ref: http://www.w3.org/TR/SVG11/shapes.html#PolygonElement.) */
has_error = true;
break;
}
if (hascpt) {
curve->lineto(x, y);
} else {
curve->moveto(x, y);
hascpt = TRUE;
}
}
if (has_error || *cptr != '\0') {
/* TODO: Flag the document as in error, as per
* http://www.w3.org/TR/SVG11/implnote.html#ErrorProcessing. */
} else if (curve->_posSet) {
/* We've done a moveto but no lineto. I'm not sure how we're supposed to represent
* a single-point polygon in SPCurve: sp_curve_closepath at the time of writing
* doesn't seem to like simply moveto followed by closepath. The following works,
* but won't round-trip properly: I believe it will write as two points rather than
* one. */
curve->lineto(curve->_movePos);
} else if (hascpt) {
curve->closepath();
}
sp_shape_set_curve(SP_SHAPE(polygon), curve, TRUE);
curve->unref();
break;
}
default:
if (((SPObjectClass *) parent_class)->set) {
((SPObjectClass *) parent_class)->set(object, key, value);
}
break;
}
}
static gchar *sp_polygon_description(SPItem */*item*/)
{
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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