1 files changed, 619 insertions, 0 deletions

diff --git a/src/object/sp-rect.cpp b/src/object/sp-rect.cpp
new file mode 100644
index 0000000..6b03dc7
--- /dev/null
+++ b/src/object/sp-rect.cpp
@@ -0,0 +1,619 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * SVG <rect> implementation
+ *
+ * Authors:
+ *   Lauris Kaplinski <lauris@kaplinski.com>
+ *   bulia byak <buliabyak@users.sf.net>
+ *
+ * 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 "display/curve.h"
+
+#include "inkscape.h"
+#include "document.h"
+#include "attributes.h"
+#include "style.h"
+#include "sp-rect.h"
+#include "sp-guide.h"
+#include "preferences.h"
+#include "svg/svg.h"
+#include "snap-candidate.h"
+#include "snap-preferences.h"
+#include <glibmm/i18n.h>
+
+#define noRECT_VERBOSE
+
+//#define OBJECT_TRACE
+
+SPRect::SPRect() : SPShape() {
+}
+
+SPRect::~SPRect() = default;
+
+void SPRect::build(SPDocument* doc, Inkscape::XML::Node* repr) {
+#ifdef OBJECT_TRACE
+    objectTrace( "SPRect::build" );
+#endif
+
+    SPShape::build(doc, repr);
+
+    this->readAttr(SPAttr::X);
+    this->readAttr(SPAttr::Y);
+    this->readAttr(SPAttr::WIDTH);
+    this->readAttr(SPAttr::HEIGHT);
+    this->readAttr(SPAttr::RX);
+    this->readAttr(SPAttr::RY);
+
+#ifdef OBJECT_TRACE
+    objectTrace( "SPRect::build", false );
+#endif
+}
+
+void SPRect::set(SPAttr key, gchar const *value) {
+
+#ifdef OBJECT_TRACE
+    std::stringstream temp;
+    temp << "SPRect::set: " << sp_attribute_name(key)  << " " << (value?value:"null");
+    objectTrace( temp.str() );
+#endif
+
+    /* fixme: We need real error processing some time */
+
+    // We must update the SVGLengths immediately or nodes may be misplaced after they are moved.
+    double const w = viewport.width();
+    double const h = viewport.height();
+    double const em = style->font_size.computed;
+    double const ex = em * 0.5;
+
+    switch (key) {
+        case SPAttr::X:
+            this->x.readOrUnset(value);
+            this->x.update( em, ex, w );
+            this->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG);
+            break;
+
+        case SPAttr::Y:
+            this->y.readOrUnset(value);
+            this->y.update( em, ex, h );
+            this->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG);
+            break;
+
+        case SPAttr::WIDTH:
+            if (!this->width.read(value) || this->width.value < 0.0) {
+            	this->width.unset();
+            }
+            this->width.update( em, ex, w );
+            this->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG);
+            break;
+
+        case SPAttr::HEIGHT:
+            if (!this->height.read(value) || this->height.value < 0.0) {
+            	this->height.unset();
+            }
+            this->height.update( em, ex, h );
+            this->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG);
+            break;
+
+        case SPAttr::RX:
+            if (!this->rx.read(value) || this->rx.value <= 0.0) {
+            	this->rx.unset();
+            }
+            this->rx.update( em, ex, w );
+            this->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG);
+            break;
+
+        case SPAttr::RY:
+            if (!this->ry.read(value) || this->ry.value <= 0.0) {
+            	this->ry.unset();
+            }
+            this->ry.update( em, ex, h );
+            this->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG);
+            break;
+
+        default:
+            SPShape::set(key, value);
+            break;
+    }
+#ifdef OBJECT_TRACE
+    objectTrace( "SPRect::set", false );
+#endif
+}
+
+void SPRect::update(SPCtx* ctx, unsigned int flags) {
+
+#ifdef OBJECT_TRACE
+    objectTrace( "SPRect::update", true, flags );
+#endif
+
+    if (flags & (SP_OBJECT_MODIFIED_FLAG | SP_OBJECT_STYLE_MODIFIED_FLAG | SP_OBJECT_VIEWPORT_MODIFIED_FLAG)) {
+        SPItemCtx const *ictx = reinterpret_cast<SPItemCtx const *>(ctx);
+
+        double const w = ictx->viewport.width();
+        double const h = ictx->viewport.height();
+        double const em = style->font_size.computed;
+        double const ex = 0.5 * em;  // fixme: get x height from pango or libnrtype.
+
+        this->x.update(em, ex, w);
+        this->y.update(em, ex, h);
+        this->width.update(em, ex, w);
+        this->height.update(em, ex, h);
+        this->rx.update(em, ex, w);
+        this->ry.update(em, ex, h);
+        this->set_shape();
+
+        flags &= ~SP_OBJECT_USER_MODIFIED_FLAG_B; // since we change the description, it's not a "just translation" anymore
+    }
+
+    SPShape::update(ctx, flags);
+#ifdef OBJECT_TRACE
+    objectTrace( "SPRect::update", false, flags );
+#endif
+}
+
+Inkscape::XML::Node * SPRect::write(Inkscape::XML::Document *xml_doc, Inkscape::XML::Node *repr, guint flags) {
+
+#ifdef OBJECT_TRACE
+    objectTrace( "SPRect::write", true, flags );
+#endif
+
+    if ((flags & SP_OBJECT_WRITE_BUILD) && !repr) {
+        repr = xml_doc->createElement("svg:rect");
+    }
+    if (this->hasPathEffectOnClipOrMaskRecursive(this) && repr && strcmp(repr->name(), "svg:rect") == 0) {
+        repr->setCodeUnsafe(g_quark_from_string("svg:path"));
+        repr->setAttribute("sodipodi:type", "rect");
+    }
+    repr->setAttributeSvgLength("width", this->width);
+    repr->setAttributeSvgLength("height", this->height);
+
+    if (this->rx._set) {
+    	repr->setAttributeSvgLength("rx", this->rx);
+    }
+
+    if (this->ry._set) {
+    	repr->setAttributeSvgLength("ry", this->ry);
+    }
+
+    repr->setAttributeSvgLength("x", this->x);
+    repr->setAttributeSvgLength("y", this->y);
+    // write d=
+    if (strcmp(repr->name(), "svg:rect") != 0) {
+        set_rect_path_attribute(repr); // include set_shape()
+    } else {
+        this->set_shape(); // evaluate SPCurve
+    }
+    SPShape::write(xml_doc, repr, flags);
+
+#ifdef OBJECT_TRACE
+    objectTrace( "SPRect::write", false, flags );
+#endif
+
+    return repr;
+}
+
+const char* SPRect::typeName() const {
+    return "rect";
+}
+
+const char* SPRect::displayName() const {
+    return _("Rectangle");
+}
+
+#define C1 0.554
+
+void SPRect::set_shape() {
+    if (checkBrokenPathEffect()) {
+        return;
+    }
+    if ((this->height.computed < 1e-18) || (this->width.computed < 1e-18)) {
+    	this->setCurveInsync(nullptr);
+    	this->setCurveBeforeLPE(nullptr);
+        return;
+    }
+
+    auto c = std::make_unique<SPCurve>();
+
+    double const x = this->x.computed;
+    double const y = this->y.computed;
+    double const w = this->width.computed;
+    double const h = this->height.computed;
+    double const w2 = w / 2;
+    double const h2 = h / 2;
+    double const rx = std::min(( this->rx._set
+                                 ? this->rx.computed
+                                 : ( this->ry._set
+                                     ? this->ry.computed
+                                     : 0.0 ) ),
+                               .5 * this->width.computed);
+    double const ry = std::min(( this->ry._set
+                                 ? this->ry.computed
+                                 : ( this->rx._set
+                                     ? this->rx.computed
+                                     : 0.0 ) ),
+                               .5 * this->height.computed);
+    /* TODO: Handle negative rx or ry as per
+     * http://www.w3.org/TR/SVG11/shapes.html#RectElementRXAttribute once Inkscape has proper error
+     * handling (see http://www.w3.org/TR/SVG11/implnote.html#ErrorProcessing).
+     */
+
+    /* We don't use proper circular/elliptical arcs, but bezier curves can approximate a 90-degree
+     * arc fairly well.
+     */
+    if ((rx > 1e-18) && (ry > 1e-18)) {
+        c->moveto(x + rx, y);
+
+        if (rx < w2) {
+        	c->lineto(x + w - rx, y);
+        }
+
+        c->curveto(x + w - rx * (1 - C1), y, x + w, y + ry * (1 - C1), x + w, y + ry);
+
+        if (ry < h2) {
+        	c->lineto(x + w, y + h - ry);
+        }
+
+        c->curveto(x + w, y + h - ry * (1 - C1), x + w - rx * (1 - C1), y + h, x + w - rx, y + h);
+
+        if (rx < w2) {
+        	c->lineto(x + rx, y + h);
+        }
+
+        c->curveto(x + rx * (1 - C1), y + h, x, y + h - ry * (1 - C1), x, y + h - ry);
+
+        if (ry < h2) {
+        	c->lineto(x, y + ry);
+        }
+
+        c->curveto(x, y + ry * (1 - C1), x + rx * (1 - C1), y, x + rx, y);
+    } else {
+        c->moveto(x + 0.0, y + 0.0);
+        c->lineto(x + w, y + 0.0);
+        c->lineto(x + w, y + h);
+        c->lineto(x + 0.0, y + h);
+    }
+
+    c->closepath();
+
+    if (prepareShapeForLPE(c.get())) {
+        return;
+    }
+
+    // This happends on undo, fix bug:#1791784
+    setCurveInsync(std::move(c));
+}
+
+bool SPRect::set_rect_path_attribute(Inkscape::XML::Node *repr)
+{
+    // Make sure our pathvector is up to date.
+    this->set_shape();
+
+    if (_curve) {
+        repr->setAttribute("d", sp_svg_write_path(_curve->get_pathvector()));
+    } else {
+        repr->removeAttribute("d");
+    }
+
+    return true;
+}
+
+void SPRect::modified(guint flags)
+{
+    if (flags & (SP_OBJECT_MODIFIED_FLAG | SP_OBJECT_STYLE_MODIFIED_FLAG | SP_OBJECT_VIEWPORT_MODIFIED_FLAG)) {
+        this->set_shape();
+    }
+
+    SPShape::modified(flags);
+}
+
+/* fixme: Think (Lauris) */
+
+void SPRect::setPosition(gdouble x, gdouble y, gdouble width, gdouble height) {
+    this->x = x;
+    this->y = y;
+    this->width = width;
+    this->height = height;
+
+    this->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG);
+}
+
+void SPRect::setRx(bool set, gdouble value) {
+    this->rx._set = set;
+
+    if (set) {
+    	this->rx = value;
+    }
+
+    this->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG);
+}
+
+void SPRect::setRy(bool set, gdouble value) {
+    this->ry._set = set;
+
+    if (set) {
+    	this->ry = value;
+    }
+
+    this->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG);
+}
+
+void SPRect::update_patheffect(bool write) {
+    SPShape::update_patheffect(write);
+}
+
+Geom::Affine SPRect::set_transform(Geom::Affine const& xform) {
+    if (pathEffectsEnabled() && !optimizeTransforms()) {
+        return xform;
+    }
+    /* Calculate rect start in parent coords. */
+    Geom::Point pos(Geom::Point(this->x.computed, this->y.computed) * xform);
+
+    /* This function takes care of translation and scaling, we return whatever parts we can't
+       handle. */
+    Geom::Affine ret(Geom::Affine(xform).withoutTranslation());
+    gdouble const sw = hypot(ret[0], ret[1]);
+    gdouble const sh = hypot(ret[2], ret[3]);
+
+    if (sw > 1e-9) {
+        ret[0] /= sw;
+        ret[1] /= sw;
+    } else {
+        ret[0] = 1.0;
+        ret[1] = 0.0;
+    }
+
+    if (sh > 1e-9) {
+        ret[2] /= sh;
+        ret[3] /= sh;
+    } else {
+        ret[2] = 0.0;
+        ret[3] = 1.0;
+    }
+
+    /* Preserve units */
+    this->width.scale( sw );
+    this->height.scale( sh );
+
+    if (this->rx._set) {
+    	this->rx.scale( sw );
+    }
+
+    if (this->ry._set) {
+    	this->ry.scale( sh );
+    }
+
+    /* Find start in item coords */
+    pos = pos * ret.inverse();
+    this->x = pos[Geom::X];
+    this->y = pos[Geom::Y];
+
+    this->set_shape();
+
+    // Adjust stroke width
+    this->adjust_stroke(sqrt(fabs(sw * sh)));
+
+    // Adjust pattern fill
+    this->adjust_pattern(xform * ret.inverse());
+
+    // Adjust gradient fill
+    this->adjust_gradient(xform * ret.inverse());
+
+    return ret;
+}
+
+
+/**
+Returns the ratio in which the vector from p0 to p1 is stretched by transform
+ */
+gdouble SPRect::vectorStretch(Geom::Point p0, Geom::Point p1, Geom::Affine xform) {
+    if (p0 == p1) {
+        return 0;
+    }
+
+    return (Geom::distance(p0 * xform, p1 * xform) / Geom::distance(p0, p1));
+}
+
+void SPRect::setVisibleRx(gdouble rx) {
+    if (rx == 0) {
+        this->rx.unset();
+    } else {
+    	this->rx = rx / SPRect::vectorStretch(
+            Geom::Point(this->x.computed + 1, this->y.computed),
+            Geom::Point(this->x.computed, this->y.computed),
+            this->i2doc_affine());
+    }
+
+    this->updateRepr();
+}
+
+void SPRect::setVisibleRy(gdouble ry) {
+    if (ry == 0) {
+    	this->ry.unset();
+    } else {
+    	this->ry = ry / SPRect::vectorStretch(
+            Geom::Point(this->x.computed, this->y.computed + 1),
+            Geom::Point(this->x.computed, this->y.computed),
+            this->i2doc_affine());
+    }
+
+    this->updateRepr();
+}
+
+gdouble SPRect::getVisibleRx() const {
+    if (!this->rx._set) {
+        return 0;
+    }
+
+    return this->rx.computed * SPRect::vectorStretch(
+        Geom::Point(this->x.computed + 1, this->y.computed),
+        Geom::Point(this->x.computed, this->y.computed),
+        this->i2doc_affine());
+}
+
+gdouble SPRect::getVisibleRy() const {
+    if (!this->ry._set) {
+        return 0;
+    }
+
+    return this->ry.computed * SPRect::vectorStretch(
+        Geom::Point(this->x.computed, this->y.computed + 1),
+        Geom::Point(this->x.computed, this->y.computed),
+        this->i2doc_affine());
+}
+
+Geom::Rect SPRect::getRect() const {
+    Geom::Point p0 = Geom::Point(this->x.computed, this->y.computed);
+    Geom::Point p2 = Geom::Point(this->x.computed + this->width.computed, this->y.computed + this->height.computed);
+
+    return Geom::Rect(p0, p2);
+}
+
+void SPRect::compensateRxRy(Geom::Affine xform) {
+    if (this->rx.computed == 0 && this->ry.computed == 0) {
+        return; // nothing to compensate
+    }
+
+    // test unit vectors to find out compensation:
+    Geom::Point c(this->x.computed, this->y.computed);
+    Geom::Point cx = c + Geom::Point(1, 0);
+    Geom::Point cy = c + Geom::Point(0, 1);
+
+    // apply previous transform if any
+    c *= this->transform;
+    cx *= this->transform;
+    cy *= this->transform;
+
+    // find out stretches that we need to compensate
+    gdouble eX = SPRect::vectorStretch(cx, c, xform);
+    gdouble eY = SPRect::vectorStretch(cy, c, xform);
+
+    // If only one of the radii is set, set both radii so they have the same visible length
+    // This is needed because if we just set them the same length in SVG, they might end up unequal because of transform
+    if ((this->rx._set && !this->ry._set) || (this->ry._set && !this->rx._set)) {
+        gdouble r = MAX(this->rx.computed, this->ry.computed);
+        this->rx = r / eX;
+        this->ry = r / eY;
+    } else {
+    	this->rx = this->rx.computed / eX;
+    	this->ry = this->ry.computed / eY;
+    }
+
+    // Note that a radius may end up larger than half-side if the rect is scaled down;
+    // that's ok because this preserves the intended radii in case the rect is enlarged again,
+    // and set_shape will take care of trimming too large radii when generating d=
+}
+
+void SPRect::setVisibleWidth(gdouble width) {
+    this->width = width / SPRect::vectorStretch(
+        Geom::Point(this->x.computed + 1, this->y.computed),
+        Geom::Point(this->x.computed, this->y.computed),
+        this->i2doc_affine());
+
+    this->updateRepr();
+}
+
+void SPRect::setVisibleHeight(gdouble height) {
+    this->height = height / SPRect::vectorStretch(
+        Geom::Point(this->x.computed, this->y.computed + 1),
+        Geom::Point(this->x.computed, this->y.computed),
+        this->i2doc_affine());
+
+	this->updateRepr();
+}
+
+gdouble SPRect::getVisibleWidth() const {
+    if (!this->width._set) {
+        return 0;
+    }
+
+    return this->width.computed * SPRect::vectorStretch(
+        Geom::Point(this->x.computed + 1, this->y.computed),
+        Geom::Point(this->x.computed, this->y.computed),
+        this->i2doc_affine());
+}
+
+gdouble SPRect::getVisibleHeight() const {
+    if (!this->height._set) {
+        return 0;
+    }
+
+    return this->height.computed * SPRect::vectorStretch(
+        Geom::Point(this->x.computed, this->y.computed + 1),
+        Geom::Point(this->x.computed, this->y.computed),
+        this->i2doc_affine());
+}
+
+void SPRect::snappoints(std::vector<Inkscape::SnapCandidatePoint> &p, Inkscape::SnapPreferences const *snapprefs) const {
+    /* This method overrides sp_shape_snappoints, which is the default for any shape. The default method
+    returns all eight points along the path of a rounded rectangle, but not the real corners. Snapping
+    the startpoint and endpoint of each rounded corner is not very useful and really confusing. Instead
+    we could snap either the real corners, or not snap at all. Bulia Byak opted to snap the real corners,
+    but it should be noted that this might be confusing in some cases with relatively large radii. With
+    small radii though the user will easily understand which point is snapping. */
+
+    Geom::Affine const i2dt (this->i2dt_affine ());
+
+    Geom::Point p0 = Geom::Point(this->x.computed, this->y.computed) * i2dt;
+    Geom::Point p1 = Geom::Point(this->x.computed, this->y.computed + this->height.computed) * i2dt;
+    Geom::Point p2 = Geom::Point(this->x.computed + this->width.computed, this->y.computed + this->height.computed) * i2dt;
+    Geom::Point p3 = Geom::Point(this->x.computed + this->width.computed, this->y.computed) * i2dt;
+
+    if (snapprefs->isTargetSnappable(Inkscape::SNAPTARGET_RECT_CORNER)) {
+        p.emplace_back(p0, Inkscape::SNAPSOURCE_RECT_CORNER, Inkscape::SNAPTARGET_RECT_CORNER);
+        p.emplace_back(p1, Inkscape::SNAPSOURCE_RECT_CORNER, Inkscape::SNAPTARGET_RECT_CORNER);
+        p.emplace_back(p2, Inkscape::SNAPSOURCE_RECT_CORNER, Inkscape::SNAPTARGET_RECT_CORNER);
+        p.emplace_back(p3, Inkscape::SNAPSOURCE_RECT_CORNER, Inkscape::SNAPTARGET_RECT_CORNER);
+    }
+
+    if (snapprefs->isTargetSnappable(Inkscape::SNAPTARGET_LINE_MIDPOINT)) {
+        p.emplace_back((p0 + p1)/2, Inkscape::SNAPSOURCE_LINE_MIDPOINT, Inkscape::SNAPTARGET_LINE_MIDPOINT);
+        p.emplace_back((p1 + p2)/2, Inkscape::SNAPSOURCE_LINE_MIDPOINT, Inkscape::SNAPTARGET_LINE_MIDPOINT);
+        p.emplace_back((p2 + p3)/2, Inkscape::SNAPSOURCE_LINE_MIDPOINT, Inkscape::SNAPTARGET_LINE_MIDPOINT);
+        p.emplace_back((p3 + p0)/2, Inkscape::SNAPSOURCE_LINE_MIDPOINT, Inkscape::SNAPTARGET_LINE_MIDPOINT);
+    }
+
+    if (snapprefs->isTargetSnappable(Inkscape::SNAPTARGET_OBJECT_MIDPOINT)) {
+        p.emplace_back((p0 + p2)/2, Inkscape::SNAPSOURCE_OBJECT_MIDPOINT, Inkscape::SNAPTARGET_OBJECT_MIDPOINT);
+    }
+}
+
+void SPRect::convert_to_guides() const {
+    Inkscape::Preferences *prefs = Inkscape::Preferences::get();
+
+    if (!prefs->getBool("/tools/shapes/rect/convertguides", true)) {
+    	// Use bounding box instead of edges
+    	SPShape::convert_to_guides();
+        return;
+    }
+
+    std::list<std::pair<Geom::Point, Geom::Point> > pts;
+
+    Geom::Affine const i2dt(this->i2dt_affine());
+
+    Geom::Point A1(Geom::Point(this->x.computed, this->y.computed) * i2dt);
+    Geom::Point A2(Geom::Point(this->x.computed, this->y.computed + this->height.computed) * i2dt);
+    Geom::Point A3(Geom::Point(this->x.computed + this->width.computed, this->y.computed + this->height.computed) * i2dt);
+    Geom::Point A4(Geom::Point(this->x.computed + this->width.computed, this->y.computed) * i2dt);
+
+    pts.emplace_back(A1, A2);
+    pts.emplace_back(A2, A3);
+    pts.emplace_back(A3, A4);
+    pts.emplace_back(A4, A1);
+
+    sp_guide_pt_pairs_to_guides(this->document, pts);
+}
+
+/*
+  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 :