1 files changed, 228 insertions, 0 deletions
diff --git a/src/extension/internal/grid.cpp b/src/extension/internal/grid.cpp
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+++ b/src/extension/internal/grid.cpp
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+// SPDX-License-Identifier: GPL-2.0-or-later
+/**
+    \file grid.cpp
+
+    A plug-in to add a grid creation effect into Inkscape.
+*/
+/*
+ * Copyright (C) 2004-2005  Ted Gould <ted@gould.cx>
+ * Copyright (C) 2007  MenTaLguY <mental@rydia.net>
+ *   Abhishek Sharma
+ *
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#include <gtkmm/box.h>
+#include <gtkmm/adjustment.h>
+#include <gtkmm/spinbutton.h>
+
+#include "desktop.h"
+
+#include "document.h"
+#include "layer-manager.h"
+#include "selection.h"
+#include "2geom/geom.h"
+
+#include "svg/path-string.h"
+
+#include "extension/effect.h"
+#include "extension/system.h"
+
+#include "util/units.h"
+
+#include "grid.h"
+
+namespace Inkscape {
+namespace Extension {
+namespace Internal {
+
+/**
+    \brief  A function to allocated anything -- just an example here
+    \param  module  Unused
+    \return Whether the load was successful
+*/
+bool
+Grid::load (Inkscape::Extension::Extension */*module*/)
+{
+    // std::cout << "Hey, I'm Grid, I'm loading!" << std::endl;
+    return TRUE;
+}
+
+namespace {
+
+Glib::ustring build_lines(Geom::Rect bounding_area,
+                          Geom::Point const &offset, Geom::Point const &spacing)
+{
+    Geom::Point point_offset(0.0, 0.0);
+
+    SVG::PathString path_data;
+
+    for ( int axis = Geom::X ; axis <= Geom::Y ; ++axis ) {
+        point_offset[axis] = offset[axis];
+
+        for (Geom::Point start_point = bounding_area.min();
+             start_point[axis] + offset[axis] <= (bounding_area.max())[axis];
+             start_point[axis] += spacing[axis]) {
+            Geom::Point end_point = start_point;
+            end_point[1-axis] = (bounding_area.max())[1-axis];
+
+            path_data.moveTo(start_point + point_offset)
+                .lineTo(end_point + point_offset);
+        }
+    }
+    // std::cout << "Path data:" << path_data.c_str() << std::endl;
+    return path_data;
+}
+
+} // namespace
+
+/**
+    \brief  This actually draws the grid.
+    \param  module   The effect that was called (unused)
+    \param  document What should be edited.
+*/
+void
+Grid::effect (Inkscape::Extension::Effect *module, Inkscape::UI::View::View *view, Inkscape::Extension::Implementation::ImplementationDocumentCache * /*docCache*/)
+{
+    auto desktop = dynamic_cast<SPDesktop *>(view);
+    Inkscape::Selection *selection = desktop->selection;
+    SPDocument *doc = desktop->doc();
+
+    Geom::Rect bounding_area = Geom::Rect(Geom::Point(0,0), Geom::Point(100,100));
+    if (selection->isEmpty()) {
+        /* get page size */
+        if (auto bounds = doc->preferredBounds()) {
+            bounding_area = *bounds;
+        }
+    } else {
+        if (auto bounds = selection->visualBounds()) {
+            bounding_area = *bounds;
+        }
+        Geom::Rect temprec = bounding_area * desktop->doc2dt();
+        bounding_area = temprec;
+    }
+
+    double scale = doc->getDocumentScale().inverse()[Geom::X];
+
+    bounding_area *= Geom::Scale(scale);
+    Geom::Point spacings( scale * module->get_param_float("xspacing"),
+                          scale * module->get_param_float("yspacing") );
+    gdouble line_width = scale * module->get_param_float("lineWidth");
+    Geom::Point offsets( scale * module->get_param_float("xoffset"),
+                         scale * module->get_param_float("yoffset") );
+
+    Glib::ustring path_data("");
+
+    path_data = build_lines(bounding_area, offsets, spacings);
+    Inkscape::XML::Document * xml_doc = doc->getReprDoc();
+
+    //XML Tree being used directly here while it shouldn't be.
+    Inkscape::XML::Node * current_layer = desktop->layerManager().currentLayer()->getRepr();
+    Inkscape::XML::Node * path = xml_doc->createElement("svg:path");
+
+    path->setAttribute("d", path_data);
+
+    std::ostringstream stringstream;
+    stringstream << "fill:none;stroke:#000000;stroke-width:" << line_width << "px";
+    path->setAttribute("style", stringstream.str());
+
+    current_layer->appendChild(path);
+    Inkscape::GC::release(path);
+}
+
+/** \brief  A class to make an adjustment that uses Extension params */
+class PrefAdjustment : public Gtk::Adjustment {
+    /** Extension that this relates to */
+    Inkscape::Extension::Extension * _ext;
+    /** The string which represents the parameter */
+    char * _pref;
+public:
+    /** \brief  Make the adjustment using an extension and the string
+                describing the parameter. */
+    PrefAdjustment(Inkscape::Extension::Extension * ext, char * pref) :
+            Gtk::Adjustment(0.0, 0.0, 10.0, 0.1), _ext(ext), _pref(pref) {
+        this->set_value(_ext->get_param_float(_pref));
+        this->signal_value_changed().connect(sigc::mem_fun(this, &PrefAdjustment::val_changed));
+        return;
+    };
+
+    void val_changed ();
+}; /* class PrefAdjustment */
+
+/** \brief  A function to respond to the value_changed signal from the
+            adjustment.
+
+    This function just grabs the value from the adjustment and writes
+    it to the parameter.  Very simple, but yet beautiful.
+*/
+void
+PrefAdjustment::val_changed ()
+{
+    // std::cout << "Value Changed to: " << this->get_value() << std::endl;
+    _ext->set_param_float(_pref, this->get_value());
+    return;
+}
+
+/** \brief  A function to get the preferences for the grid
+    \param  module  Module which holds the params
+    \param  view     Unused today - may get style information in the future.
+
+    Uses AutoGUI for creating the GUI.
+*/
+Gtk::Widget *
+Grid::prefs_effect(Inkscape::Extension::Effect *module, Inkscape::UI::View::View * view, sigc::signal<void> * changeSignal, Inkscape::Extension::Implementation::ImplementationDocumentCache * /*docCache*/)
+{
+    SPDocument * current_document = view->doc();
+
+    auto selected = ((SPDesktop *) view)->getSelection()->items();
+    Inkscape::XML::Node * first_select = nullptr;
+    if (!selected.empty()) {
+        first_select = selected.front()->getRepr();
+    }
+
+    return module->autogui(current_document, first_select, changeSignal);
+}
+
+#include "clear-n_.h"
+
+void
+Grid::init ()
+{
+    // clang-format off
+    Inkscape::Extension::build_from_mem(
+        "<inkscape-extension xmlns=\"" INKSCAPE_EXTENSION_URI "\">\n"
+            "<name>" N_("Grid") "</name>\n"
+            "<id>org.inkscape.effect.grid</id>\n"
+            "<param name=\"lineWidth\" gui-text=\"" N_("Line Width:") "\" type=\"float\">1.0</param>\n"
+            "<param name=\"xspacing\" gui-text=\"" N_("Horizontal Spacing:") "\" type=\"float\" min=\"0.1\" max=\"1000\">10.0</param>\n"
+            "<param name=\"yspacing\" gui-text=\"" N_("Vertical Spacing:") "\" type=\"float\" min=\"0.1\" max=\"1000\">10.0</param>\n"
+            "<param name=\"xoffset\" gui-text=\"" N_("Horizontal Offset:") "\" type=\"float\" min=\"0.0\" max=\"1000\">0.0</param>\n"
+            "<param name=\"yoffset\" gui-text=\"" N_("Vertical Offset:") "\" type=\"float\" min=\"0.0\" max=\"1000\">0.0</param>\n"
+            "<effect>\n"
+                "<object-type>all</object-type>\n"
+                "<effects-menu>\n"
+                "<submenu name=\"" N_("Render") "\">\n"
+                    "<submenu name=\"" N_("Grids") "\" />\n"
+                "</submenu>\n"
+                "</effects-menu>\n"
+                "<menu-tip>" N_("Draw a path which is a grid") "</menu-tip>\n"
+            "</effect>\n"
+        "</inkscape-extension>\n", new Grid());
+    // clang-format on
+    return;
+}
+
+}; /* namespace Internal */
+}; /* namespace Extension */
+}; /* namespace Inkscape */
+
+/*
+  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 :