1 files changed, 173 insertions, 0 deletions
diff --git a/src/object/sp-line.cpp b/src/object/sp-line.cpp
new file mode 100644
index 0000000..bcc13e9
--- /dev/null
+++ b/src/object/sp-line.cpp
@@ -0,0 +1,173 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * SVG <line> implementation
+ *
+ * Authors:
+ *   Lauris Kaplinski <lauris@kaplinski.com>
+ *   Abhishek Sharma
+ *   Jon A. Cruz <jon@joncruz.org>
+ *
+ * Copyright (C) 1999-2002 Lauris Kaplinski
+ *
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#include "attributes.h"
+#include "style.h"
+#include "sp-line.h"
+#include "sp-guide.h"
+#include "display/curve.h"
+#include <glibmm/i18n.h>
+#include "document.h"
+#include "inkscape.h"
+
+SPLine::SPLine() : SPShape() {
+    this->x1.unset();
+    this->y1.unset();
+    this->x2.unset();
+    this->y2.unset();
+}
+
+SPLine::~SPLine() = default;
+
+void SPLine::build(SPDocument * document, Inkscape::XML::Node * repr) {
+    SPShape::build(document, repr);
+
+    this->readAttr(SPAttr::X1);
+    this->readAttr(SPAttr::Y1);
+    this->readAttr(SPAttr::X2);
+    this->readAttr(SPAttr::Y2);
+}
+
+void SPLine::set(SPAttr key, const gchar* value) {
+    /* fixme: we should really collect updates */
+
+    switch (key) {
+        case SPAttr::X1:
+            this->x1.readOrUnset(value);
+            this->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG);
+            break;
+
+        case SPAttr::Y1:
+            this->y1.readOrUnset(value);
+            this->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG);
+            break;
+
+        case SPAttr::X2:
+            this->x2.readOrUnset(value);
+            this->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG);
+            break;
+
+        case SPAttr::Y2:
+            this->y2.readOrUnset(value);
+            this->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG);
+            break;
+
+        default:
+            SPShape::set(key, value);
+            break;
+    }
+}
+
+void SPLine::update(SPCtx *ctx, guint flags) {
+    if (flags & (SP_OBJECT_MODIFIED_FLAG | SP_OBJECT_STYLE_MODIFIED_FLAG | SP_OBJECT_VIEWPORT_MODIFIED_FLAG)) {
+        SPStyle const *style = this->style;
+        SPItemCtx const *ictx = (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 = em * 0.5;  // fixme: get from pango or libnrtype.
+
+        this->x1.update(em, ex, w);
+        this->x2.update(em, ex, w);
+        this->y1.update(em, ex, h);
+        this->y2.update(em, ex, h);
+
+        this->set_shape();
+    }
+
+    SPShape::update(ctx, flags);
+}
+
+Inkscape::XML::Node* SPLine::write(Inkscape::XML::Document *xml_doc, Inkscape::XML::Node *repr, guint flags) {
+    if ((flags & SP_OBJECT_WRITE_BUILD) && !repr) {
+        repr = xml_doc->createElement("svg:line");
+    }
+
+    if (repr != this->getRepr()) {
+        repr->mergeFrom(this->getRepr(), "id");
+    }
+
+    repr->setAttributeSvgDouble("x1", this->x1.computed);
+    repr->setAttributeSvgDouble("y1", this->y1.computed);
+    repr->setAttributeSvgDouble("x2", this->x2.computed);
+    repr->setAttributeSvgDouble("y2", this->y2.computed);
+
+    SPShape::write(xml_doc, repr, flags);
+
+    return repr;
+}
+
+const char* SPLine::typeName() const {
+    return "path";
+}
+
+const char* SPLine::displayName() const {
+    return _("Line");
+}
+
+void SPLine::convert_to_guides() const {
+    Geom::Point points[2];
+    Geom::Affine const i2dt(this->i2dt_affine());
+
+    points[0] = Geom::Point(this->x1.computed, this->y1.computed)*i2dt;
+    points[1] = Geom::Point(this->x2.computed, this->y2.computed)*i2dt;
+
+    SPGuide::createSPGuide(this->document, points[0], points[1]);
+}
+
+
+Geom::Affine SPLine::set_transform(Geom::Affine const &transform) {
+    Geom::Point points[2];
+
+    points[0] = Geom::Point(this->x1.computed, this->y1.computed);
+    points[1] = Geom::Point(this->x2.computed, this->y2.computed);
+
+    points[0] *= transform;
+    points[1] *= transform;
+
+    this->x1.computed = points[0][Geom::X];
+    this->y1.computed = points[0][Geom::Y];
+    this->x2.computed = points[1][Geom::X];
+    this->y2.computed = points[1][Geom::Y];
+
+    this->adjust_stroke(transform.descrim());
+
+    this->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG | SP_OBJECT_STYLE_MODIFIED_FLAG);
+
+    return Geom::identity();
+}
+
+void SPLine::set_shape() {
+    auto c = std::make_unique<SPCurve>();
+
+    c->moveto(this->x1.computed, this->y1.computed);
+    c->lineto(this->x2.computed, this->y2.computed);
+
+    // *_insync does not call update, avoiding infinite recursion when set_shape is called by update
+    setCurveInsync(std::move(c));
+    setCurveBeforeLPE(curve());
+
+    // LPE's cannot be applied to lines. (the result can (generally) not be represented as SPLine)
+}
+
+/*
+  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 :