Adding upstream version 1.2.2.upstream/1.2.2upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 569 insertions, 0 deletions

diff --git a/src/object/sp-star.cpp b/src/object/sp-star.cpp
new file mode 100644
index 0000000..1e098a6
--- /dev/null
+++ b/src/object/sp-star.cpp
@@ -0,0 +1,569 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * <sodipodi:star> implementation
+ *
+ * Authors:
+ *   Mitsuru Oka <oka326@parkcity.ne.jp>
+ *   Lauris Kaplinski <lauris@kaplinski.com>
+ *   bulia byak <buliabyak@users.sf.net>
+ *   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 <cstring>
+#include <string>
+#include <glib.h>
+#include "live_effects/effect.h"
+
+#include "svg/svg.h"
+#include "attributes.h"
+#include "display/curve.h"
+#include "xml/repr.h"
+#include "document.h"
+
+#include "sp-star.h"
+#include <glibmm/i18n.h>
+
+SPStar::SPStar() : SPShape() ,
+	sides(5),
+	center(0, 0),
+	flatsided(false),
+	rounded(0.0),
+	randomized(0.0)
+{
+	this->r[0] = 1.0;
+	this->r[1] = 0.001;
+	this->arg[0] = this->arg[1] = 0.0;
+}
+
+SPStar::~SPStar() = default;
+
+void SPStar::build(SPDocument * document, Inkscape::XML::Node * repr) {
+	// CPPIFY: see header file
+    SPShape::build(document, repr);
+
+    this->readAttr(SPAttr::SODIPODI_CX);
+    this->readAttr(SPAttr::SODIPODI_CY);
+    this->readAttr(SPAttr::INKSCAPE_FLATSIDED);
+    this->readAttr(SPAttr::SODIPODI_SIDES);
+    this->readAttr(SPAttr::SODIPODI_R1);
+    this->readAttr(SPAttr::SODIPODI_R2);
+    this->readAttr(SPAttr::SODIPODI_ARG1);
+    this->readAttr(SPAttr::SODIPODI_ARG2);
+    this->readAttr(SPAttr::INKSCAPE_ROUNDED);
+    this->readAttr(SPAttr::INKSCAPE_RANDOMIZED);
+}
+
+Inkscape::XML::Node* SPStar::write(Inkscape::XML::Document *xml_doc, Inkscape::XML::Node *repr, guint flags) {
+    if ((flags & SP_OBJECT_WRITE_BUILD) && !repr) {
+        repr = xml_doc->createElement("svg:path");
+    }
+
+    if (flags & SP_OBJECT_WRITE_EXT) {
+        repr->setAttribute("sodipodi:type", "star");
+        repr->setAttributeBoolean("inkscape:flatsided", this->flatsided);
+        repr->setAttributeInt("sodipodi:sides", this->sides);
+        repr->setAttributeSvgDouble("sodipodi:cx", this->center[Geom::X]);
+        repr->setAttributeSvgDouble("sodipodi:cy", this->center[Geom::Y]);
+        repr->setAttributeSvgDouble("sodipodi:r1", this->r[0]);
+        repr->setAttributeSvgDouble("sodipodi:r2", this->r[1]);
+        repr->setAttributeSvgDouble("sodipodi:arg1", this->arg[0]);
+        repr->setAttributeSvgDouble("sodipodi:arg2", this->arg[1]);
+        repr->setAttributeSvgDouble("inkscape:rounded", this->rounded);
+        repr->setAttributeSvgDouble("inkscape:randomized", this->randomized);
+    }
+
+    this->set_shape();
+    if (this->_curve) {
+        repr->setAttribute("d", sp_svg_write_path(this->_curve->get_pathvector()));
+    } else {
+        repr->removeAttribute("d");
+    }
+    // CPPIFY: see header file
+    SPShape::write(xml_doc, repr, flags);
+
+    return repr;
+}
+
+void SPStar::set(SPAttr key, const gchar* value) {
+    SVGLength::Unit unit;
+
+    /* fixme: we should really collect updates */
+    switch (key) {
+    case SPAttr::SODIPODI_SIDES:
+        if (value) {
+            this->sides = atoi (value);
+            this->sides = CLAMP(this->sides, this->flatsided ? 3 : 2, 1024);
+        } else {
+            this->sides = 5;
+        }
+
+        this->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG);
+        break;
+
+    case SPAttr::SODIPODI_CX:
+        if (!sp_svg_length_read_ldd (value, &unit, nullptr, &this->center[Geom::X]) ||
+            (unit == SVGLength::EM) ||
+            (unit == SVGLength::EX) ||
+            (unit == SVGLength::PERCENT)) {
+            this->center[Geom::X] = 0.0;
+        }
+
+        this->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG);
+        break;
+
+    case SPAttr::SODIPODI_CY:
+        if (!sp_svg_length_read_ldd (value, &unit, nullptr, &this->center[Geom::Y]) ||
+            (unit == SVGLength::EM) ||
+            (unit == SVGLength::EX) ||
+            (unit == SVGLength::PERCENT)) {
+            this->center[Geom::Y] = 0.0;
+        }
+
+        this->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG);
+        break;
+
+    case SPAttr::SODIPODI_R1:
+        if (!sp_svg_length_read_ldd (value, &unit, nullptr, &this->r[0]) ||
+            (unit == SVGLength::EM) ||
+            (unit == SVGLength::EX) ||
+            (unit == SVGLength::PERCENT)) {
+            this->r[0] = 1.0;
+        }
+
+        /* fixme: Need CLAMP (Lauris) */
+        this->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG);
+        break;
+
+    case SPAttr::SODIPODI_R2:
+        if (!sp_svg_length_read_ldd (value, &unit, nullptr, &this->r[1]) ||
+            (unit == SVGLength::EM) ||
+            (unit == SVGLength::EX) ||
+            (unit == SVGLength::PERCENT)) {
+            this->r[1] = 0.0;
+        }
+
+        this->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG);
+        return;
+
+    case SPAttr::SODIPODI_ARG1:
+        if (value) {
+            this->arg[0] = g_ascii_strtod (value, nullptr);
+        } else {
+            this->arg[0] = 0.0;
+        }
+
+        this->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG);
+        break;
+
+    case SPAttr::SODIPODI_ARG2:
+        if (value) {
+            this->arg[1] = g_ascii_strtod (value, nullptr);
+        } else {
+            this->arg[1] = 0.0;
+        }
+
+        this->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG);
+        break;
+
+    case SPAttr::INKSCAPE_FLATSIDED:
+        if (value && !strcmp(value, "true")) {
+            this->flatsided = true;
+            this->sides = MAX(this->sides, 3);
+        } else {
+        	this->flatsided = false;
+        }
+
+        this->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG);
+        break;
+
+    case SPAttr::INKSCAPE_ROUNDED:
+        if (value) {
+            this->rounded = g_ascii_strtod (value, nullptr);
+        } else {
+            this->rounded = 0.0;
+        }
+
+        this->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG);
+        break;
+
+    case SPAttr::INKSCAPE_RANDOMIZED:
+        if (value) {
+            this->randomized = g_ascii_strtod (value, nullptr);
+        } else {
+            this->randomized = 0.0;
+        }
+
+        this->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG);
+        break;
+
+    default:
+    	// CPPIFY: see header file
+        SPShape::set(key, value);
+        break;
+    }
+}
+
+void SPStar::update(SPCtx *ctx, guint flags) {
+    if (flags & (SP_OBJECT_MODIFIED_FLAG |
+             SP_OBJECT_STYLE_MODIFIED_FLAG |
+             SP_OBJECT_VIEWPORT_MODIFIED_FLAG)) {
+
+        this->set_shape();
+    }
+
+    // CPPIFY: see header file
+    SPShape::update(ctx, flags);
+}
+
+const char* SPStar::typeName() const {
+    if (this->flatsided == false)
+        return "star";
+    return "polygon";
+}
+
+const char* SPStar::displayName() const {
+    if (this->flatsided == false)
+        return _("Star");
+    return _("Polygon");
+}
+
+gchar* SPStar::description() const {
+    // while there will never be less than 2 or 3 vertices, we still need to
+    // make calls to ngettext because the pluralization may be different
+    // for various numbers >=3.  The singular form is used as the index.
+    return g_strdup_printf (ngettext(_("with %d vertex"), _("with %d vertices"),
+                this->sides), this->sides);
+}
+
+/**
+Returns a unit-length vector at 90 degrees to the direction from o to n
+ */
+static Geom::Point
+rot90_rel (Geom::Point o, Geom::Point n)
+{
+    return ((1/Geom::L2(n - o)) * Geom::Point ((n - o)[Geom::Y],  (o - n)[Geom::X]));
+}
+
+/**
+Returns a unique 32 bit int for a given point.
+Obvious (but acceptable for my purposes) limits to uniqueness:
+- returned value for x,y repeats for x+n*1024,y+n*1024
+- returned value is unchanged when the point is moved by less than 1/1024 of px
+*/
+static guint32
+point_unique_int (Geom::Point o)
+{
+    return ((guint32)
+    65536 *
+        (((int) floor (o[Geom::X] * 64)) % 1024 + ((int) floor (o[Geom::X] * 1024)) % 64)
+    +
+             (((int) floor (o[Geom::Y] * 64)) % 1024 + ((int) floor (o[Geom::Y] * 1024)) % 64)
+    );
+}
+
+/**
+Returns the next pseudorandom value using the Linear Congruential Generator algorithm (LCG)
+with the parameters (m = 2^32, a = 69069, b = 1). These parameters give a full-period generator,
+i.e. it is guaranteed to go through all integers < 2^32 (see http://random.mat.sbg.ac.at/~charly/server/server.html)
+*/
+static inline guint32
+lcg_next(guint32 const prev)
+{
+    return (guint32) ( 69069 * prev + 1 );
+}
+
+/**
+Returns a random number in the range [-0.5, 0.5) from the given seed, stepping the given number of steps from the seed.
+*/
+static double
+rnd (guint32 const seed, unsigned steps) {
+    guint32 lcg = seed;
+    for (; steps > 0; steps --)
+        lcg = lcg_next (lcg);
+
+    return ( lcg / 4294967296. ) - 0.5;
+}
+
+static Geom::Point
+sp_star_get_curvepoint (SPStar *star, SPStarPoint point, gint index, bool previ)
+{
+    // the point whose neighboring curve handle we're calculating
+    Geom::Point o = sp_star_get_xy (star, point, index);
+
+    // indices of previous and next points
+    gint pi = (index > 0)? (index - 1) : (star->sides - 1);
+    gint ni = (index < star->sides - 1)? (index + 1) : 0;
+
+    // the other point type
+    SPStarPoint other = (point == SP_STAR_POINT_KNOT2? SP_STAR_POINT_KNOT1 : SP_STAR_POINT_KNOT2);
+
+    // the neighbors of o; depending on flatsided, they're either the same type (polygon) or the other type (star)
+    Geom::Point prev = (star->flatsided? sp_star_get_xy (star, point, pi) : sp_star_get_xy (star, other, point == SP_STAR_POINT_KNOT2? index : pi));
+    Geom::Point next = (star->flatsided? sp_star_get_xy (star, point, ni) : sp_star_get_xy (star, other, point == SP_STAR_POINT_KNOT1? index : ni));
+
+    // prev-next midpoint
+    Geom::Point mid =  0.5 * (prev + next);
+
+    // point to which we direct the bissector of the curve handles;
+    // it's far enough outside the star on the perpendicular to prev-next through mid
+    Geom::Point biss =  mid + 100000 * rot90_rel (mid, next);
+
+    // lengths of vectors to prev and next
+    gdouble prev_len = Geom::L2 (prev - o);
+    gdouble next_len = Geom::L2 (next - o);
+
+    // unit-length vector perpendicular to o-biss
+    Geom::Point rot = rot90_rel (o, biss);
+
+    // multiply rot by star->rounded coefficient and the distance to the star point; flip for next
+    Geom::Point ret;
+    if (previ) {
+        ret = (star->rounded * prev_len) * rot;
+    } else {
+        ret = (star->rounded * next_len * -1) * rot;
+    }
+
+    if (star->randomized == 0) {
+        // add the vector to o to get the final curvepoint
+        return o + ret;
+    } else {
+        // the seed corresponding to the exact point
+        guint32 seed = point_unique_int (o);
+
+        // randomly rotate (by step 3 from the seed) and scale (by step 4) the vector
+        ret = ret * Geom::Affine (Geom::Rotate (star->randomized * M_PI * rnd (seed, 3)));
+        ret *= ( 1 + star->randomized * rnd (seed, 4));
+
+        // the randomized corner point
+        Geom::Point o_randomized = sp_star_get_xy (star, point, index, true);
+
+        return o_randomized + ret;
+    }
+}
+
+#define NEXT false
+#define PREV true
+
+void SPStar::set_shape() {
+    // perhaps we should convert all our shapes into LPEs without source path
+    // and with knotholders for parameters, then this situation will be handled automatically
+    // by disabling the entire stack (including the shape LPE)
+    if (checkBrokenPathEffect()) {
+        return;
+    }
+
+    auto c = std::make_unique<SPCurve>();
+
+    bool not_rounded = (fabs (this->rounded) < 1e-4);
+
+    // note that we pass randomized=true to sp_star_get_xy, because the curve must be randomized;
+    // other places that call that function (e.g. the knotholder) need the exact point
+
+    // draw 1st segment
+    c->moveto(sp_star_get_xy (this, SP_STAR_POINT_KNOT1, 0, true));
+
+    if (this->flatsided == false) {
+        if (not_rounded) {
+            c->lineto(sp_star_get_xy (this, SP_STAR_POINT_KNOT2, 0, true));
+        } else {
+            c->curveto(sp_star_get_curvepoint (this, SP_STAR_POINT_KNOT1, 0, NEXT),
+                sp_star_get_curvepoint (this, SP_STAR_POINT_KNOT2, 0, PREV),
+                sp_star_get_xy (this, SP_STAR_POINT_KNOT2, 0, true));
+        }
+    }
+
+    // draw all middle segments
+    for (gint i = 1; i < sides; i++) {
+        if (not_rounded) {
+            c->lineto(sp_star_get_xy (this, SP_STAR_POINT_KNOT1, i, true));
+        } else {
+            if (this->flatsided == false) {
+                c->curveto(sp_star_get_curvepoint (this, SP_STAR_POINT_KNOT2, i - 1, NEXT),
+                        sp_star_get_curvepoint (this, SP_STAR_POINT_KNOT1, i, PREV),
+                        sp_star_get_xy (this, SP_STAR_POINT_KNOT1, i, true));
+            } else {
+                c->curveto(sp_star_get_curvepoint (this, SP_STAR_POINT_KNOT1, i - 1, NEXT),
+                        sp_star_get_curvepoint (this, SP_STAR_POINT_KNOT1, i, PREV),
+                        sp_star_get_xy (this, SP_STAR_POINT_KNOT1, i, true));
+            }
+        }
+
+        if (this->flatsided == false) {
+            if (not_rounded) {
+                       c->lineto(sp_star_get_xy (this, SP_STAR_POINT_KNOT2, i, true));
+            } else {
+                c->curveto(sp_star_get_curvepoint (this, SP_STAR_POINT_KNOT1, i, NEXT),
+                    sp_star_get_curvepoint (this, SP_STAR_POINT_KNOT2, i, PREV),
+                    sp_star_get_xy (this, SP_STAR_POINT_KNOT2, i, true));
+            }
+        }
+    }
+
+    // draw last segment
+	if (!not_rounded) {
+		if (this->flatsided == false) {
+			c->curveto(sp_star_get_curvepoint (this, SP_STAR_POINT_KNOT2, sides - 1, NEXT),
+				sp_star_get_curvepoint (this, SP_STAR_POINT_KNOT1, 0, PREV),
+				sp_star_get_xy (this, SP_STAR_POINT_KNOT1, 0, true));
+		} else {
+			c->curveto(sp_star_get_curvepoint (this, SP_STAR_POINT_KNOT1, sides - 1, NEXT),
+				sp_star_get_curvepoint (this, SP_STAR_POINT_KNOT1, 0, PREV),
+				sp_star_get_xy (this, SP_STAR_POINT_KNOT1, 0, true));
+		}
+	}
+
+    c->closepath();
+
+    if (prepareShapeForLPE(c.get())) {
+        return;
+    }
+
+    // This happends on undo, fix bug:#1791784
+    setCurveInsync(std::move(c));
+}
+
+void
+sp_star_position_set (SPStar *star, gint sides, Geom::Point center, gdouble r1, gdouble r2, gdouble arg1, gdouble arg2, bool isflat, double rounded, double randomized)
+{
+    g_return_if_fail (star != nullptr);
+    g_return_if_fail (SP_IS_STAR (star));
+
+    star->flatsided = isflat;
+    star->center = center;
+    star->r[0] = MAX (r1, 0.001);
+
+    if (isflat == false) {
+        star->sides = CLAMP(sides, 2, 1024);
+        star->r[1] = CLAMP(r2, 0.0, star->r[0]);
+    } else {
+        star->sides = CLAMP(sides, 3, 1024);
+        star->r[1] = CLAMP( r1*cos(M_PI/sides) ,0.0, star->r[0] );
+    }
+
+    star->arg[0] = arg1;
+    star->arg[1] = arg2;
+    star->rounded = rounded;
+    star->randomized = randomized;
+    star->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG);
+}
+
+void SPStar::snappoints(std::vector<Inkscape::SnapCandidatePoint> &p, Inkscape::SnapPreferences const *snapprefs) const {
+    // We will determine the star's midpoint ourselves, instead of trusting on the base class
+    // Therefore snapping to object midpoints is temporarily disabled
+    Inkscape::SnapPreferences local_snapprefs = *snapprefs;
+    local_snapprefs.setTargetSnappable(Inkscape::SNAPTARGET_OBJECT_MIDPOINT, false);
+
+    // CPPIFY: see header file
+    SPShape::snappoints(p, &local_snapprefs);
+
+    if (snapprefs->isTargetSnappable(Inkscape::SNAPTARGET_OBJECT_MIDPOINT)) {
+        Geom::Affine const i2dt (this->i2dt_affine ());
+        p.emplace_back(this->center * i2dt,Inkscape::SNAPSOURCE_OBJECT_MIDPOINT, Inkscape::SNAPTARGET_OBJECT_MIDPOINT);
+    }
+}
+
+Geom::Affine SPStar::set_transform(Geom::Affine const &xform)
+{
+    bool opt_trans = (randomized == 0);
+    if (pathEffectsEnabled() && !optimizeTransforms()) {
+        return xform;
+    }
+    // Only set transform with proportional scaling
+    if (!xform.withoutTranslation().isUniformScale()) {
+        return xform;
+    }
+
+    /* Calculate star start in parent coords. */
+    Geom::Point pos( this->center * xform );
+
+    /* This function takes care of translation and scaling, we return whatever parts we can't
+       handle. */
+    Geom::Affine ret(opt_trans ? xform.withoutTranslation() : xform);
+    gdouble const s = hypot(ret[0], ret[1]);
+    if (s > 1e-9) {
+        ret[0] /= s;
+        ret[1] /= s;
+        ret[2] /= s;
+        ret[3] /= s;
+    } else {
+        ret[0] = 1.0;
+        ret[1] = 0.0;
+        ret[2] = 0.0;
+        ret[3] = 1.0;
+    }
+
+    this->r[0] *= s;
+    this->r[1] *= s;
+
+    /* Find start in item coords */
+    pos = pos * ret.inverse();
+    this->center = pos;
+
+    this->set_shape();
+
+    // Adjust stroke width
+    this->adjust_stroke(s);
+
+    // Adjust pattern fill
+    this->adjust_pattern(xform * ret.inverse());
+
+    // Adjust gradient fill
+    this->adjust_gradient(xform * ret.inverse());
+
+    return ret;
+}
+
+void SPStar::update_patheffect(bool write) {
+    SPShape::update_patheffect(write);
+}
+
+/**
+ * sp_star_get_xy: Get X-Y value as item coordinate system
+ * @star: star item
+ * @point: point type to obtain X-Y value
+ * @index: index of vertex
+ * @p: pointer to store X-Y value
+ * @randomized: false (default) if you want to get exact, not randomized point
+ *
+ * Initial item coordinate system is same as document coordinate system.
+ */
+Geom::Point
+sp_star_get_xy (SPStar const *star, SPStarPoint point, gint index, bool randomized)
+{
+    gdouble darg = 2.0 * M_PI / (double) star->sides;
+
+    double arg = star->arg[point];
+    arg += index * darg;
+
+    Geom::Point xy = star->r[point] * Geom::Point(cos(arg), sin(arg)) + star->center;
+
+    if (!randomized || star->randomized == 0) {
+        // return the exact point
+        return xy;
+    } else { // randomize the point
+        // find out the seed, unique for this point so that randomization is the same so long as the original point is stationary
+        guint32 seed = point_unique_int (xy);
+        // the full range (corresponding to star->randomized == 1.0) is equal to the star's diameter
+        double range = 2 * MAX (star->r[0], star->r[1]);
+        // find out the random displacement; x is controlled by step 1 from the seed, y by the step 2
+        Geom::Point shift (star->randomized * range * rnd (seed, 1), star->randomized * range * rnd (seed, 2));
+        // add the shift to the exact point
+        return xy + shift;
+    }
+}
+
+/*
+  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:fileencoding=utf-8:textwidth=99 :