#define __SP_ELLIPSE_C__

#ifdef HAVE_CONFIG_H

# include "config.h"

#endif

#include "libnr/nr-matrix-fns.h"

#include "svg/svg.h"

#include "svg/path-string.h"

#include "xml/repr.h"

#include "attributes.h"

#include "style.h"

#include "display/curve.h"

#include <glibmm/i18n.h>

#include <2geom/transforms.h>

#include "document.h"

#include "sp-ellipse.h"

#include "preferences.h"

#define noELLIPSE_VERBOSE

#ifndef M_PI

#define M_PI 3.14159265358979323846

#endif

#define SP_2PI (2 * M_PI)

#if 1

#define sp_round(v,m) (((v) < 0.0) ? ((ceil((v) / (m) - 0.5)) * (m)) : ((floor((v) / (m) + 0.5)) * (m)))

#else

static double sp_round(double x, double y)

{

double remain;

g_assert(y > 0.0);

/* return round(x/y) * y; */

remain = fmod(x, y);

if (remain >= 0.5*y)

return x - remain + y;

else

return x - remain;

}

#endif

static void sp_genericellipse_class_init(SPGenericEllipseClass *klass);

static void sp_genericellipse_init(SPGenericEllipse *ellipse);

static void sp_genericellipse_update(SPObject *object, SPCtx *ctx, guint flags);

static void sp_genericellipse_snappoints(SPItem const *item, bool const target, SnapPointsWithType &p, Inkscape::SnapPreferences const *snapprefs);

static void sp_genericellipse_set_shape(SPShape *shape);

static void sp_genericellipse_update_patheffect (SPLPEItem *lpeitem, bool write);

static Inkscape::XML::Node *sp_genericellipse_write(SPObject *object, Inkscape::XML::Document *doc, Inkscape::XML::Node *repr,

guint flags);

static gboolean sp_arc_set_elliptical_path_attribute(SPArc *arc, Inkscape::XML::Node *repr);

static SPShapeClass *ge_parent_class;

sp_genericellipse_get_type(void)

{

static GType type = 0;

if (!type) {

GTypeInfo info = {

sizeof(SPGenericEllipseClass),

NULL, /* base_init */

NULL, /* base_finalize */

(GClassInitFunc) sp_genericellipse_class_init,

NULL, /* class_finalize */

NULL, /* class_data */

sizeof(SPGenericEllipse),

16, /* n_preallocs */

(GInstanceInitFunc) sp_genericellipse_init,

NULL, /* value_table */

};

type = g_type_register_static(SP_TYPE_SHAPE, "SPGenericEllipse", &info, (GTypeFlags)0);

}

return type;

}

static void sp_genericellipse_class_init(SPGenericEllipseClass *klass)

{

SPObjectClass *sp_object_class = (SPObjectClass *) klass;

SPItemClass *item_class = (SPItemClass *) klass;

SPLPEItemClass *lpe_item_class = (SPLPEItemClass *) klass;

SPShapeClass *shape_class = (SPShapeClass *) klass;

ge_parent_class = (SPShapeClass*) g_type_class_ref(SP_TYPE_SHAPE);

sp_object_class->update = sp_genericellipse_update;

sp_object_class->write = sp_genericellipse_write;

item_class->snappoints = sp_genericellipse_snappoints;

shape_class->set_shape = sp_genericellipse_set_shape;

lpe_item_class->update_patheffect = sp_genericellipse_update_patheffect;

}

static void

sp_genericellipse_init(SPGenericEllipse *ellipse)

{

ellipse->cx.unset();

ellipse->cy.unset();

ellipse->rx.unset();

ellipse->ry.unset();

ellipse->start = 0.0;

ellipse->end = SP_2PI;

ellipse->closed = TRUE;

}

static void

sp_genericellipse_update(SPObject *object, SPCtx *ctx, guint flags)

{

if (flags & (SP_OBJECT_MODIFIED_FLAG | SP_OBJECT_STYLE_MODIFIED_FLAG | SP_OBJECT_VIEWPORT_MODIFIED_FLAG)) {

SPGenericEllipse *ellipse = (SPGenericEllipse *) object;

SPStyle const *style = object->style;

Geom::OptRect viewbox = ((SPItemCtx const *) ctx)->vp;

double const dx = viewbox->width();

double const dy = viewbox->height();

double const dr = sqrt(dx*dx + dy*dy)/sqrt(2);

double const em = style->font_size.computed;

double const ex = em * 0.5; // fixme: get from pango or libnrtype

ellipse->cx.update(em, ex, dx);

ellipse->cy.update(em, ex, dy);

ellipse->rx.update(em, ex, dr);

ellipse->ry.update(em, ex, dr);

sp_shape_set_shape((SPShape *) object);

}

if (((SPObjectClass *) ge_parent_class)->update)

((SPObjectClass *) ge_parent_class)->update(object, ctx, flags);

}

static void

sp_genericellipse_update_patheffect(SPLPEItem *lpeitem, bool write)

{

SPShape *shape = (SPShape *) lpeitem;

sp_genericellipse_set_shape(shape);

if (write) {

Inkscape::XML::Node *repr = SP_OBJECT_REPR(shape);

if ( shape->curve != NULL ) {

gchar *str = sp_svg_write_path(shape->curve->get_pathvector());

repr->setAttribute("d", str);

g_free(str);

} else {

repr->setAttribute("d", NULL);

}

}

((SPObject *)shape)->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG);

}

static void sp_genericellipse_set_shape(SPShape *shape)

{

double rx, ry, s, e;

double x0, y0, x1, y1, x2, y2, x3, y3;

double len;

gint slice = FALSE;

// gint i;

SPGenericEllipse *ellipse = (SPGenericEllipse *) shape;

if ((ellipse->rx.computed < 1e-18) || (ellipse->ry.computed < 1e-18)) return;

if (fabs(ellipse->end - ellipse->start) < 1e-9) return;

sp_genericellipse_normalize(ellipse);

rx = ellipse->rx.computed;

ry = ellipse->ry.computed;

// figure out if we have a slice, guarding against rounding errors

len = fmod(ellipse->end - ellipse->start, SP_2PI);

if (len < 0.0) len += SP_2PI;

if (fabs(len) < 1e-8 || fabs(len - SP_2PI) < 1e-8) {

slice = FALSE;

ellipse->end = ellipse->start + SP_2PI;

} else {

slice = TRUE;

}

SPCurve * curve = new SPCurve();

curve->moveto(cos(ellipse->start), sin(ellipse->start));

for (s = ellipse->start; s < ellipse->end; s += M_PI_2) {

e = s + M_PI_2;

if (e > ellipse->end)

e = ellipse->end;

len = 4*tan((e - s)/4)/3;

x0 = cos(s);

y0 = sin(s);

x1 = x0 + len * cos(s + M_PI_2);

y1 = y0 + len * sin(s + M_PI_2);

x3 = cos(e);

y3 = sin(e);

x2 = x3 + len * cos(e - M_PI_2);

y2 = y3 + len * sin(e - M_PI_2);

#ifdef ELLIPSE_VERBOSE

g_print("step %d s %f e %f coords %f %f %f %f %f %f\n",

i, s, e, x1, y1, x2, y2, x3, y3);

#endif

curve->curveto(x1,y1, x2,y2, x3,y3);

}

if (slice && ellipse->closed) { // TODO: is this check for "ellipse->closed" necessary?

curve->lineto(0., 0.);

}

if (ellipse->closed) {

curve->closepath();

}

Geom::Matrix aff = Geom::Scale(rx, ry) * Geom::Translate(ellipse->cx.computed, ellipse->cy.computed);

curve->transform(aff);

/* Reset the shape'scurve to the "original_curve"

sp_shape_set_curve_insync (shape, curve, TRUE);

if (sp_lpe_item_has_path_effect(SP_LPE_ITEM(shape)) && sp_lpe_item_path_effects_enabled(SP_LPE_ITEM(shape))) {

SPCurve *c_lpe = curve->copy();

bool success = sp_lpe_item_perform_path_effect(SP_LPE_ITEM (shape), c_lpe);

if (success) {

sp_shape_set_curve_insync (shape, c_lpe, TRUE);

}

c_lpe->unref();

}

curve->unref();

}

static void sp_genericellipse_snappoints(SPItem const *item, bool const target, SnapPointsWithType &p, Inkscape::SnapPreferences const *snapprefs)

{

g_assert(item != NULL);

g_assert(SP_IS_GENERICELLIPSE(item));

// Help enforcing strict snapping, i.e. only return nodes when we're snapping nodes to nodes or a guide to nodes

if (!(snapprefs->getSnapModeNode() || snapprefs->getSnapModeGuide())) {

return;

}

SPGenericEllipse *ellipse = SP_GENERICELLIPSE(item);

sp_genericellipse_normalize(ellipse);

Geom::Matrix const i2d = sp_item_i2d_affine(item);

// figure out if we have a slice, while guarding against rounding errors

bool slice = false;

double len = fmod(ellipse->end - ellipse->start, SP_2PI);

if (len < 0.0) len += SP_2PI;

if (fabs(len) < 1e-8 || fabs(len - SP_2PI) < 1e-8) {

slice = false;

ellipse->end = ellipse->start + SP_2PI;

} else {

slice = true;

}

double rx = ellipse->rx.computed;

double ry = ellipse->ry.computed;

double cx = ellipse->cx.computed;

double cy = ellipse->cy.computed;

Geom::Point pt;

// Snap to the 4 quadrant points of the ellipse, but only if the arc

// spans far enough to include them

if (snapprefs->getSnapToItemNode()) { //TODO: Make a separate snap option toggle for this?

double angle = 0;

for (angle = 0; angle < SP_2PI; angle += M_PI_2) {

if (angle >= ellipse->start && angle <= ellipse->end) {

pt = Geom::Point(cx + cos(angle)*rx, cy + sin(angle)*ry) * i2d;

p.push_back(std::make_pair(pt, target ? int(Inkscape::SNAPTARGET_ELLIPSE_QUADRANT_POINT) : int(Inkscape::SNAPSOURCE_ELLIPSE_QUADRANT_POINT)));

}

}

}

// Add the centre, if we have a closed slice or when explicitly asked for

if ((snapprefs->getSnapToItemNode() && slice && ellipse->closed) || snapprefs->getSnapObjectMidpoints()) {

pt = Geom::Point(cx, cy) * i2d;

p.push_back(std::make_pair(pt, target ? int(Inkscape::SNAPTARGET_HANDLE) : int(Inkscape::SNAPSOURCE_HANDLE)));

}

// And if we have a slice, also snap to the endpoints

if (snapprefs->getSnapToItemNode() && slice) {

// Add the start point, if it's not coincident with a quadrant point

if (fmod(ellipse->start, M_PI_2) != 0.0 ) {

pt = Geom::Point(cx + cos(ellipse->start)*rx, cy + sin(ellipse->start)*ry) * i2d;

p.push_back(std::make_pair(pt, target ? int(Inkscape::SNAPTARGET_NODE_CUSP) : int(Inkscape::SNAPSOURCE_NODE_CUSP)));

}

// Add the end point, if it's not coincident with a quadrant point

if (fmod(ellipse->end, M_PI_2) != 0.0 ) {

pt = Geom::Point(cx + cos(ellipse->end)*rx, cy + sin(ellipse->end)*ry) * i2d;

p.push_back(std::make_pair(pt, target ? int(Inkscape::SNAPTARGET_NODE_CUSP) : int(Inkscape::SNAPSOURCE_NODE_CUSP)));

}

}

}

sp_genericellipse_normalize(SPGenericEllipse *ellipse)

{

ellipse->start = fmod(ellipse->start, SP_2PI);

ellipse->end = fmod(ellipse->end, SP_2PI);

if (ellipse->start < 0.0)

ellipse->start += SP_2PI;

double diff = ellipse->start - ellipse->end;

if (diff >= 0.0)

ellipse->end += diff - fmod(diff, SP_2PI) + SP_2PI;

/* Now we keep: 0 <= start < end <= 2*PI */

}

static Inkscape::XML::Node *sp_genericellipse_write(SPObject *object, Inkscape::XML::Document *xml_doc, Inkscape::XML::Node *repr, guint flags)

{

SPGenericEllipse *ellipse = SP_GENERICELLIPSE(object);

if (flags & SP_OBJECT_WRITE_EXT) {

if ((flags & SP_OBJECT_WRITE_BUILD) && !repr) {

repr = xml_doc->createElement("svg:path");

}

sp_repr_set_svg_double(repr, "sodipodi:cx", ellipse->cx.computed);

sp_repr_set_svg_double(repr, "sodipodi:cy", ellipse->cy.computed);

sp_repr_set_svg_double(repr, "sodipodi:rx", ellipse->rx.computed);

sp_repr_set_svg_double(repr, "sodipodi:ry", ellipse->ry.computed);

if (SP_IS_ARC(ellipse))

sp_arc_set_elliptical_path_attribute(SP_ARC(object), SP_OBJECT_REPR(object));

}

if (((SPObjectClass *) ge_parent_class)->write)

((SPObjectClass *) ge_parent_class)->write(object, xml_doc, repr, flags);

return repr;

}

static void sp_ellipse_class_init(SPEllipseClass *klass);

static void sp_ellipse_init(SPEllipse *ellipse);

static void sp_ellipse_build(SPObject *object, SPDocument *document, Inkscape::XML::Node *repr);

static Inkscape::XML::Node *sp_ellipse_write(SPObject *object, Inkscape::XML::Document *doc, Inkscape::XML::Node *repr, guint flags);

static void sp_ellipse_set(SPObject *object, unsigned int key, gchar const *value);

static gchar *sp_ellipse_description(SPItem *item);

static SPGenericEllipseClass *ellipse_parent_class;

sp_ellipse_get_type(void)

{

static GType type = 0;

if (!type) {

GTypeInfo info = {

sizeof(SPEllipseClass),

NULL, /* base_init */

NULL, /* base_finalize */

(GClassInitFunc) sp_ellipse_class_init,

NULL, /* class_finalize */

NULL, /* class_data */

sizeof(SPEllipse),

16, /* n_preallocs */

(GInstanceInitFunc) sp_ellipse_init,

NULL, /* value_table */

};

type = g_type_register_static(SP_TYPE_GENERICELLIPSE, "SPEllipse", &info, (GTypeFlags)0);

}

return type;

}

static void sp_ellipse_class_init(SPEllipseClass *klass)

{

SPObjectClass *sp_object_class = (SPObjectClass *) klass;

SPItemClass *item_class = (SPItemClass *) klass;

ellipse_parent_class = (SPGenericEllipseClass*) g_type_class_ref(SP_TYPE_GENERICELLIPSE);

sp_object_class->build = sp_ellipse_build;

sp_object_class->write = sp_ellipse_write;

sp_object_class->set = sp_ellipse_set;

item_class->description = sp_ellipse_description;

}

static void

sp_ellipse_init(SPEllipse */*ellipse*/)

{

/* Nothing special */

}

static void

sp_ellipse_build(SPObject *object, SPDocument *document, Inkscape::XML::Node *repr)

{

if (((SPObjectClass *) ellipse_parent_class)->build)

(* ((SPObjectClass *) ellipse_parent_class)->build) (object, document, repr);

sp_object_read_attr(object, "cx");

sp_object_read_attr(object, "cy");

sp_object_read_attr(object, "rx");

sp_object_read_attr(object, "ry");

}

static Inkscape::XML::Node *

sp_ellipse_write(SPObject *object, Inkscape::XML::Document *xml_doc, Inkscape::XML::Node *repr, guint flags)

{

SPGenericEllipse *ellipse;

ellipse = SP_GENERICELLIPSE(object);

if ((flags & SP_OBJECT_WRITE_BUILD) && !repr) {

repr = xml_doc->createElement("svg:ellipse");

}

sp_repr_set_svg_double(repr, "cx", ellipse->cx.computed);

sp_repr_set_svg_double(repr, "cy", ellipse->cy.computed);

sp_repr_set_svg_double(repr, "rx", ellipse->rx.computed);

sp_repr_set_svg_double(repr, "ry", ellipse->ry.computed);

if (((SPObjectClass *) ellipse_parent_class)->write)

(* ((SPObjectClass *) ellipse_parent_class)->write) (object, xml_doc, repr, flags);

return repr;

}

static void

sp_ellipse_set(SPObject *object, unsigned int key, gchar const *value)

{

SPGenericEllipse *ellipse;

ellipse = SP_GENERICELLIPSE(object);

switch (key) {

case SP_ATTR_CX:

ellipse->cx.readOrUnset(value);

object->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG);

break;

case SP_ATTR_CY:

ellipse->cy.readOrUnset(value);

object->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG);

break;

case SP_ATTR_RX:

if (!ellipse->rx.read(value) || (ellipse->rx.value <= 0.0)) {

ellipse->rx.unset();

}

object->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG);

break;

case SP_ATTR_RY:

if (!ellipse->ry.read(value) || (ellipse->ry.value <= 0.0)) {

ellipse->ry.unset();

}

object->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG);

break;

default:

if (((SPObjectClass *) ellipse_parent_class)->set)

((SPObjectClass *) ellipse_parent_class)->set(object, key, value);

break;

}

}

static gchar *sp_ellipse_description(SPItem */*item*/)

{

return g_strdup(_("<b>Ellipse</b>"));

}

sp_ellipse_position_set(SPEllipse *ellipse, gdouble x, gdouble y, gdouble rx, gdouble ry)

{

SPGenericEllipse *ge;

g_return_if_fail(ellipse != NULL);

g_return_if_fail(SP_IS_ELLIPSE(ellipse));

ge = SP_GENERICELLIPSE(ellipse);

ge->cx.computed = x;

ge->cy.computed = y;

ge->rx.computed = rx;

ge->ry.computed = ry;

((SPObject *)ge)->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG);

}

static void sp_circle_class_init(SPCircleClass *klass);

static void sp_circle_init(SPCircle *circle);

static void sp_circle_build(SPObject *object, SPDocument *document, Inkscape::XML::Node *repr);

static Inkscape::XML::Node *sp_circle_write(SPObject *object, Inkscape::XML::Document *doc, Inkscape::XML::Node *repr, guint flags);

static void sp_circle_set(SPObject *object, unsigned int key, gchar const *value);

static gchar *sp_circle_description(SPItem *item);

static SPGenericEllipseClass *circle_parent_class;

sp_circle_get_type(void)

{

static GType type = 0;

if (!type) {

GTypeInfo info = {

sizeof(SPCircleClass),

NULL, /* base_init */

NULL, /* base_finalize */

(GClassInitFunc) sp_circle_class_init,

NULL, /* class_finalize */

NULL, /* class_data */

sizeof(SPCircle),

16, /* n_preallocs */

(GInstanceInitFunc) sp_circle_init,

NULL, /* value_table */

};

type = g_type_register_static(SP_TYPE_GENERICELLIPSE, "SPCircle", &info, (GTypeFlags)0);

}

return type;

}

static void

sp_circle_class_init(SPCircleClass *klass)

{

SPObjectClass *sp_object_class = (SPObjectClass *) klass;

SPItemClass *item_class = (SPItemClass *) klass;

circle_parent_class = (SPGenericEllipseClass*) g_type_class_ref(SP_TYPE_GENERICELLIPSE);

sp_object_class->build = sp_circle_build;

sp_object_class->write = sp_circle_write;

sp_object_class->set = sp_circle_set;

item_class->description = sp_circle_description;

}

static void

sp_circle_init(SPCircle */*circle*/)

{

/* Nothing special */

}

static void

sp_circle_build(SPObject *object, SPDocument *document, Inkscape::XML::Node *repr)

{

if (((SPObjectClass *) circle_parent_class)->build)

(* ((SPObjectClass *) circle_parent_class)->build)(object, document, repr);

sp_object_read_attr(object, "cx");

sp_object_read_attr(object, "cy");

sp_object_read_attr(object, "r");

}

static Inkscape::XML::Node *

sp_circle_write(SPObject *object, Inkscape::XML::Document *xml_doc, Inkscape::XML::Node *repr, guint flags)

{

SPGenericEllipse *ellipse;

ellipse = SP_GENERICELLIPSE(object);

if ((flags & SP_OBJECT_WRITE_BUILD) && !repr) {

repr = xml_doc->createElement("svg:circle");

}

sp_repr_set_svg_double(repr, "cx", ellipse->cx.computed);

sp_repr_set_svg_double(repr, "cy", ellipse->cy.computed);

sp_repr_set_svg_double(repr, "r", ellipse->rx.computed);

if (((SPObjectClass *) circle_parent_class)->write)

((SPObjectClass *) circle_parent_class)->write(object, xml_doc, repr, flags);

return repr;

}

static void

sp_circle_set(SPObject *object, unsigned int key, gchar const *value)

{

SPGenericEllipse *ge;

ge = SP_GENERICELLIPSE(object);

switch (key) {

case SP_ATTR_CX:

ge->cx.readOrUnset(value);

object->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG);

break;

case SP_ATTR_CY:

ge->cy.readOrUnset(value);

object->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG);

break;

case SP_ATTR_R:

if (!ge->rx.read(value) || ge->rx.value <= 0.0) {

ge->rx.unset();

}

ge->ry = ge->rx;

object->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG);

break;

default:

if (((SPObjectClass *) circle_parent_class)->set)

((SPObjectClass *) circle_parent_class)->set(object, key, value);

break;

}

}

static gchar *sp_circle_description(SPItem */*item*/)

{

return g_strdup(_("<b>Circle</b>"));

}

static void sp_arc_class_init(SPArcClass *klass);

static void sp_arc_init(SPArc *arc);

static void sp_arc_build(SPObject *object, SPDocument *document, Inkscape::XML::Node *repr);

static Inkscape::XML::Node *sp_arc_write(SPObject *object, Inkscape::XML::Document *doc, Inkscape::XML::Node *repr, guint flags);

static void sp_arc_set(SPObject *object, unsigned int key, gchar const *value);

static void sp_arc_modified(SPObject *object, guint flags);

static gchar *sp_arc_description(SPItem *item);

static SPGenericEllipseClass *arc_parent_class;

sp_arc_get_type(void)

{

static GType type = 0;

if (!type) {

GTypeInfo info = {

sizeof(SPArcClass),

NULL, /* base_init */

NULL, /* base_finalize */

(GClassInitFunc) sp_arc_class_init,

NULL, /* class_finalize */

NULL, /* class_data */

sizeof(SPArc),

16, /* n_preallocs */

(GInstanceInitFunc) sp_arc_init,

NULL, /* value_table */

};

type = g_type_register_static(SP_TYPE_GENERICELLIPSE, "SPArc", &info, (GTypeFlags)0);

}

return type;

}

static void

sp_arc_class_init(SPArcClass *klass)

{

SPObjectClass *sp_object_class = (SPObjectClass *) klass;

SPItemClass *item_class = (SPItemClass *) klass;

arc_parent_class = (SPGenericEllipseClass*) g_type_class_ref(SP_TYPE_GENERICELLIPSE);

sp_object_class->build = sp_arc_build;

sp_object_class->write = sp_arc_write;

sp_object_class->set = sp_arc_set;

sp_object_class->modified = sp_arc_modified;

item_class->description = sp_arc_description;

}

static void

sp_arc_init(SPArc */*arc*/)

{

/* Nothing special */

}

static void

sp_arc_build(SPObject *object, SPDocument *document, Inkscape::XML::Node *repr)

{

if (((SPObjectClass *) arc_parent_class)->build)

(* ((SPObjectClass *) arc_parent_class)->build) (object, document, repr);

Inkscape::Version version = sp_object_get_sodipodi_version(object);

sp_object_read_attr(object, "sodipodi:cx");

sp_object_read_attr(object, "sodipodi:cy");

sp_object_read_attr(object, "sodipodi:rx");

sp_object_read_attr(object, "sodipodi:ry");

sp_object_read_attr(object, "sodipodi:start");

sp_object_read_attr(object, "sodipodi:end");

sp_object_read_attr(object, "sodipodi:open");

}

static gboolean

sp_arc_set_elliptical_path_attribute(SPArc *arc, Inkscape::XML::Node *repr)

{

SPGenericEllipse *ge = SP_GENERICELLIPSE(arc);

Inkscape::SVG::PathString str;

Geom::Point p1 = sp_arc_get_xy(arc, ge->start);

Geom::Point p2 = sp_arc_get_xy(arc, ge->end);

double rx = ge->rx.computed;

double ry = ge->ry.computed;

str.moveTo(p1);

double dt = fmod(ge->end - ge->start, SP_2PI);

if (fabs(dt) < 1e-6) {

Geom::Point ph = sp_arc_get_xy(arc, (ge->start + ge->end) / 2.0);

str.arcTo(rx, ry, 0, true, true, ph)

.arcTo(rx, ry, 0, true, true, p2)

.closePath();

} else {

bool fa = (fabs(dt) > M_PI);

bool fs = (dt > 0);

str.arcTo(rx, ry, 0, fa, fs, p2);

if (ge->closed) {

Geom::Point center = Geom::Point(ge->cx.computed, ge->cy.computed);

str.lineTo(center).closePath();

}

}

repr->setAttribute("d", str.c_str());

return true;

}

static Inkscape::XML::Node *

sp_arc_write(SPObject *object, Inkscape::XML::Document *xml_doc, Inkscape::XML::Node *repr, guint flags)

{

SPGenericEllipse *ge = SP_GENERICELLIPSE(object);

SPArc *arc = SP_ARC(object);

if ((flags & SP_OBJECT_WRITE_BUILD) && !repr) {

repr = xml_doc->createElement("svg:path");

}

if (flags & SP_OBJECT_WRITE_EXT) {

repr->setAttribute("sodipodi:type", "arc");

sp_repr_set_svg_double(repr, "sodipodi:cx", ge->cx.computed);

sp_repr_set_svg_double(repr, "sodipodi:cy", ge->cy.computed);

sp_repr_set_svg_double(repr, "sodipodi:rx", ge->rx.computed);

sp_repr_set_svg_double(repr, "sodipodi:ry", ge->ry.computed);

// write start and end only if they are non-trivial; otherwise remove

gdouble len = fmod(ge->end - ge->start, SP_2PI);

if (len < 0.0) len += SP_2PI;

if (!(fabs(len) < 1e-8 || fabs(len - SP_2PI) < 1e-8)) {

sp_repr_set_svg_double(repr, "sodipodi:start", ge->start);

sp_repr_set_svg_double(repr, "sodipodi:end", ge->end);

repr->setAttribute("sodipodi:open", (!ge->closed) ? "true" : NULL);

} else {

repr->setAttribute("sodipodi:end", NULL);

repr->setAttribute("sodipodi:start", NULL);

repr->setAttribute("sodipodi:open", NULL);

}

}

// write d=

sp_arc_set_elliptical_path_attribute(arc, repr);

if (((SPObjectClass *) arc_parent_class)->write)

((SPObjectClass *) arc_parent_class)->write(object, xml_doc, repr, flags);

return repr;

}

static void

sp_arc_set(SPObject *object, unsigned int key, gchar const *value)

{

SPGenericEllipse *ge = SP_GENERICELLIPSE(object);

switch (key) {

case SP_ATTR_SODIPODI_CX:

ge->cx.readOrUnset(value);

object->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG);

break;

case SP_ATTR_SODIPODI_CY:

ge->cy.readOrUnset(value);

object->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG);

break;

case SP_ATTR_SODIPODI_RX:

if (!ge->rx.read(value) || ge->rx.computed <= 0.0) {

ge->rx.unset();

}

object->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG);

break;

case SP_ATTR_SODIPODI_RY:

if (!ge->ry.read(value) || ge->ry.computed <= 0.0) {

ge->ry.unset();

}

object->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG);

break;

case SP_ATTR_SODIPODI_START:

if (value) {

sp_svg_number_read_d(value, &ge->start);

} else {

ge->start = 0;

}

object->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG);

break;

case SP_ATTR_SODIPODI_END:

if (value) {

sp_svg_number_read_d(value, &ge->end);

} else {

ge->end = 2 * M_PI;

}

object->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG);

break;

case SP_ATTR_SODIPODI_OPEN:

ge->closed = (!value);

object->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG);

break;

default:

if (((SPObjectClass *) arc_parent_class)->set)

((SPObjectClass *) arc_parent_class)->set(object, key, value);

break;

}

}

static void

sp_arc_modified(SPObject *object, guint flags)

{

if (flags & (SP_OBJECT_MODIFIED_FLAG | SP_OBJECT_STYLE_MODIFIED_FLAG | SP_OBJECT_VIEWPORT_MODIFIED_FLAG)) {

sp_shape_set_shape((SPShape *) object);

}

if (((SPObjectClass *) arc_parent_class)->modified)

((SPObjectClass *) arc_parent_class)->modified(object, flags);

}

static gchar *sp_arc_description(SPItem *item)

{

SPGenericEllipse *ge = SP_GENERICELLIPSE(item);

gdouble len = fmod(ge->end - ge->start, SP_2PI);

if (len < 0.0) len += SP_2PI;

if (!(fabs(len) < 1e-8 || fabs(len - SP_2PI) < 1e-8)) {

if (ge->closed) {

return g_strdup(_("<b>Segment</b>"));

} else {

return g_strdup(_("<b>Arc</b>"));

}

} else {

return g_strdup(_("<b>Ellipse</b>"));

}

}

sp_arc_position_set(SPArc *arc, gdouble x, gdouble y, gdouble rx, gdouble ry)

{

g_return_if_fail(arc != NULL);

g_return_if_fail(SP_IS_ARC(arc));

SPGenericEllipse *ge = SP_GENERICELLIPSE(arc);

ge->cx.computed = x;

ge->cy.computed = y;

ge->rx.computed = rx;

ge->ry.computed = ry;

Inkscape::Preferences *prefs = Inkscape::Preferences::get();

if (prefs->getDouble("/tools/shapes/arc/start", 0.0) != 0)

ge->start = prefs->getDouble("/tools/shapes/arc/start", 0.0);

if (prefs->getDouble("/tools/shapes/arc/end", 0.0) != 0)

ge->end = prefs->getDouble("/tools/shapes/arc/end", 0.0);

if (!prefs->getBool("/tools/shapes/arc/open"))

ge->closed = 1;

else

ge->closed = 0;

((SPObject *)arc)->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG);

}

Geom::Point sp_arc_get_xy(SPArc *arc, gdouble arg)

{

SPGenericEllipse *ge = SP_GENERICELLIPSE(arc);

return Geom::Point(ge->rx.computed * cos(arg) + ge->cx.computed,

ge->ry.computed * sin(arg) + ge->cy.computed);

}