/*
 * Our nice measuring tool
 *
 * Authors:
 *   Felipe Correa da Silva Sanches <juca@members.fsf.org>
 *   Jon A. Cruz <jon@joncruz.org>
 *   Jabiertxo Arraiza <jabier.arraiza@marker.es>
 *
 * Copyright (C) 2011 Authors
 *
 * Released under GNU GPL, read the file 'COPYING' for more information
 */
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif

#include <gtkmm.h>
#include <gdk/gdkkeysyms.h>
#include <boost/none_t.hpp>
#include "util/units.h"
#include "display/curve.h"
#include "display/sodipodi-ctrl.h"
#include "display/sp-ctrlline.h"
#include "display/sp-ctrlcurve.h"
#include "display/sp-canvas.h"
#include "display/sp-canvas-item.h"
#include "display/sp-canvas-util.h"
#include "svg/svg.h"
#include "svg/svg-color.h"
#include "ui/tools/measure-tool.h"
#include "ui/tools/freehand-base.h"
#include <2geom/line.h>
#include <2geom/path-intersection.h>
#include <2geom/pathvector.h>
#include <2geom/crossing.h>
#include <2geom/angle.h>
#include <2geom/transforms.h>
#include "ui/dialog/knot-properties.h"
#include "sp-namedview.h"
#include "sp-shape.h"
#include "sp-text.h"
#include "sp-flowtext.h"
#include "sp-defs.h"
#include "sp-item.h"
#include "sp-root.h"
#include "macros.h"
#include "svg/stringstream.h"
#include "rubberband.h"
#include "path-chemistry.h"
#include "desktop.h"
#include "document.h"
#include "document-undo.h"
#include "viewbox.h"
#include "snap.h"
#include "knot.h"
#include "text-editing.h"
#include "pixmaps/cursor-measure.xpm"
#include "preferences.h"
#include "inkscape.h"
#include "enums.h"
#include "knot-enums.h"
#include "desktop-style.h"
#include "verbs.h"
#include <glibmm/i18n.h>

using Inkscape::ControlManager;
using Inkscape::CTLINE_SECONDARY;
using Inkscape::Util::unit_table;
using Inkscape::DocumentUndo;

#define MT_KNOT_COLOR_NORMAL 0xffffff00
#define MT_KNOT_COLOR_MOUSEOVER 0xff000000


namespace Inkscape {
namespace UI {
namespace Tools {

const std::string& MeasureTool::getPrefsPath()
{
    return MeasureTool::prefsPath;
}

const std::string MeasureTool::prefsPath = "/tools/measure";

namespace {

/**
 * Simple class to use for removing label overlap.
 */
class LabelPlacement {
public:

    double lengthVal;
    double offset;
    Geom::Point start;
    Geom::Point end;
};

bool SortLabelPlacement(LabelPlacement const &first, LabelPlacement const &second)
{
    if (first.end[Geom::Y] == second.end[Geom::Y]) {
        return first.end[Geom::X] < second.end[Geom::X];
    } else {
        return first.end[Geom::Y] < second.end[Geom::Y];
    }
}

//precision is for give the number of decimal positions 
//of the label to calculate label width
void repositionOverlappingLabels(std::vector<LabelPlacement> &placements, SPDesktop *desktop, Geom::Point const &normal, double fontsize, int precision)
{
    std::sort(placements.begin(), placements.end(), SortLabelPlacement);

    double border = 3;
    Geom::Rect box;
    {
        Geom::Point tmp(fontsize * (6 + precision) + (border * 2), fontsize + (border * 2));
        tmp = desktop->w2d(tmp);
        box = Geom::Rect(-tmp[Geom::X] / 2, -tmp[Geom::Y] / 2, tmp[Geom::X] / 2, tmp[Geom::Y] / 2);
    }

    // Using index since vector may be re-ordered as we go.
    // Starting at one, since the first item can't overlap itself
    for (size_t i = 1; i < placements.size(); i++) {
        LabelPlacement &place = placements[i];

        bool changed = false;
        do {
            Geom::Rect current(box + place.end);

            changed = false;
            bool overlaps = false;
            for (size_t j = i; (j > 0) && !overlaps; --j) {
                LabelPlacement &otherPlace = placements[j - 1];
                Geom::Rect target(box + otherPlace.end);
                if (current.intersects(target)) {
                    overlaps = true;
                }
            }
            if (overlaps) {
                place.offset += (fontsize + border);
                place.end = place.start - desktop->w2d(normal * place.offset);
                changed = true;
            }
        } while (changed);

        std::sort(placements.begin(), placements.begin() + i + 1, SortLabelPlacement);
    }
}

/**
 * Calculates where to place the anchor for the display text and arc.
 *
 * @param desktop the desktop that is being used.
 * @param angle the angle to be displaying.
 * @param baseAngle the angle of the initial baseline.
 * @param startPoint the point that is the vertex of the selected angle.
 * @param endPoint the point that is the end the user is manipulating for measurement.
 * @param fontsize the size to display the text label at.
 */
Geom::Point calcAngleDisplayAnchor(SPDesktop *desktop, double angle, double baseAngle,
                                   Geom::Point const &startPoint, Geom::Point const &endPoint,
                                   double fontsize)
{
    // Time for the trick work of figuring out where things should go, and how.
    double lengthVal = (endPoint - startPoint).length();
    double effective = baseAngle + (angle / 2);
    Geom::Point where(lengthVal, 0);
    where *= Geom::Affine(Geom::Rotate(effective)) * Geom::Affine(Geom::Translate(startPoint));

    // When the angle is tight, the label would end up under the cursor and/or lines. Bump it
    double scaledFontsize = std::abs(fontsize * desktop->w2d(Geom::Point(0, 1.0))[Geom::Y]);
    if (std::abs((where - endPoint).length()) < scaledFontsize) {
        where[Geom::Y] += scaledFontsize * 2;
    }

    // We now have the ideal position, but need to see if it will fit/work.

    Geom::Rect visibleArea = desktop->get_display_area();
    // Bring it in to "title safe" for the anchor point
    Geom::Point textBox = desktop->w2d(Geom::Point(fontsize * 3, fontsize / 2));
    textBox[Geom::Y] = std::abs(textBox[Geom::Y]);

    visibleArea = Geom::Rect(visibleArea.min()[Geom::X] + textBox[Geom::X],
                             visibleArea.min()[Geom::Y] + textBox[Geom::Y],
                             visibleArea.max()[Geom::X] - textBox[Geom::X],
                             visibleArea.max()[Geom::Y] - textBox[Geom::Y]);

    where[Geom::X] = std::min(where[Geom::X], visibleArea.max()[Geom::X]);
    where[Geom::X] = std::max(where[Geom::X], visibleArea.min()[Geom::X]);
    where[Geom::Y] = std::min(where[Geom::Y], visibleArea.max()[Geom::Y]);
    where[Geom::Y] = std::max(where[Geom::Y], visibleArea.min()[Geom::Y]);

    return where;
}

/**
 * Create a measure iten in current document.
 *
 * @param pathv the path to create.
 * @param markers, if the path resuts get markers.
 * @param color of the stroke.
 * @param measure_repr container element.
 */
void setMeasureItem(Geom::PathVector pathv, bool is_curve, bool markers, guint32 color, Inkscape::XML::Node *measure_repr)
{
    SPDesktop *desktop = SP_ACTIVE_DESKTOP;
    if(!desktop) {
        return;
    }
    SPDocument *doc = desktop->getDocument();
    Inkscape::XML::Document *xml_doc = doc->getReprDoc();
    Inkscape::XML::Node *repr;
    repr = xml_doc->createElement("svg:path");
    gchar *str = sp_svg_write_path(pathv);
    SPCSSAttr *css = sp_repr_css_attr_new();
    Geom::Coord strokewidth = SP_ITEM(desktop->currentLayer())->i2doc_affine().inverse().expansionX();
    std::stringstream stroke_width;
    stroke_width.imbue(std::locale::classic());
    if(measure_repr) {
        stroke_width <<  strokewidth / desktop->current_zoom();
    } else {
        stroke_width <<  strokewidth;
    }
    sp_repr_css_set_property (css, "stroke-width", stroke_width.str().c_str());
    sp_repr_css_set_property (css, "fill", "none");
    if(color) {
        gchar color_line[64];
        sp_svg_write_color (color_line, sizeof(color_line), color);
        sp_repr_css_set_property (css, "stroke", color_line);
    } else {
        sp_repr_css_set_property (css, "stroke", "#ff0000");
    }
    char const * stroke_linecap = is_curve ? "butt" : "square";
    sp_repr_css_set_property (css, "stroke-linecap", stroke_linecap);
    sp_repr_css_set_property (css, "stroke-linejoin", "miter");
    sp_repr_css_set_property (css, "stroke-miterlimit", "4");
    sp_repr_css_set_property (css, "stroke-dasharray", "none");
    if(measure_repr) {
        sp_repr_css_set_property (css, "stroke-opacity", "0.5");
    } else {
        sp_repr_css_set_property (css, "stroke-opacity", "1");
    }
    if(markers) {
        sp_repr_css_set_property (css, "marker-start", "url(#Arrow2Sstart)");
        sp_repr_css_set_property (css, "marker-end", "url(#Arrow2Send)");
    }
    Glib::ustring css_str;
    sp_repr_css_write_string(css,css_str);
    repr->setAttribute("style", css_str.c_str());
    sp_repr_css_attr_unref (css);
    g_assert( str != NULL );
    repr->setAttribute("d", str);
    g_free(str);
    if(measure_repr) {
        measure_repr->addChild(repr, NULL);
        Inkscape::GC::release(repr);
    } else {
        SPItem *item = SP_ITEM(desktop->currentLayer()->appendChildRepr(repr));
        Inkscape::GC::release(repr);
        item->updateRepr();
        desktop->getSelection()->clear();
        desktop->getSelection()->add(item);
    }
}

/**
 * Given an angle, the arc center and edge point, draw an arc segment centered around that edge point.
 *
 * @param desktop the desktop that is being used.
 * @param center the center point for the arc.
 * @param end the point that ends at the edge of the arc segment.
 * @param anchor the anchor point for displaying the text label.
 * @param angle the angle of the arc segment to draw.
 * @param measure_rpr the container of the curve if converted to items.
 */
void createAngleDisplayCurve(SPDesktop *desktop, Geom::Point const &center, Geom::Point const &end, Geom::Point const &anchor, double angle, bool to_phantom, std::vector<SPCanvasItem *> &measure_phantom_items , std::vector<SPCanvasItem *> &measure_tmp_items , Inkscape::XML::Node *measure_repr = NULL)
{
    // Given that we have a point on the arc's edge and the angle of the arc, we need to get the two endpoints.

    double textLen = std::abs((anchor - center).length());
    double sideLen = std::abs((end - center).length());
    if (sideLen > 0.0) {
        double factor = std::min(1.0, textLen / sideLen);

        // arc start
        Geom::Point p1 = end * (Geom::Affine(Geom::Translate(-center))
                                * Geom::Affine(Geom::Scale(factor))
                                * Geom::Affine(Geom::Translate(center)));

        // arc end
        Geom::Point p4 = p1 * (Geom::Affine(Geom::Translate(-center))
                               * Geom::Affine(Geom::Rotate(-angle))
                               * Geom::Affine(Geom::Translate(center)));

        // from Riskus
        double xc = center[Geom::X];
        double yc = center[Geom::Y];
        double ax = p1[Geom::X] - xc;
        double ay = p1[Geom::Y] - yc;
        double bx = p4[Geom::X] - xc;
        double by = p4[Geom::Y] - yc;
        double q1 = (ax * ax) + (ay * ay);
        double q2 = q1 + (ax * bx) + (ay * by);

        double k2 = (4.0 / 3.0) * (std::sqrt(2 * q1 * q2) - q2) / ((ax * by) - (ay * bx));

        Geom::Point p2(xc + ax - (k2 * ay),
                       yc + ay  + (k2 * ax));
        Geom::Point p3(xc + bx + (k2 * by),
                       yc + by - (k2 * bx));
        SPCtrlCurve *curve = ControlManager::getManager().createControlCurve(desktop->getTempGroup(), p1, p2, p3, p4, CTLINE_SECONDARY);
        if(to_phantom){
            curve->rgba = 0x8888887f;
            measure_phantom_items.push_back(SP_CANVAS_ITEM(curve));
        } else {
            measure_tmp_items.push_back(SP_CANVAS_ITEM(curve));
        }
        sp_canvas_item_move_to_z(SP_CANVAS_ITEM(curve), 0);
        sp_canvas_item_show(SP_CANVAS_ITEM(curve));
        if(measure_repr) {
            Geom::PathVector pathv;
            Geom::Path path;
            path.start(desktop->doc2dt(p1));
            path.appendNew<Geom::CubicBezier>(desktop->doc2dt(p2),desktop->doc2dt(p3),desktop->doc2dt(p4));
            pathv.push_back(path);
            pathv *= SP_ITEM(desktop->currentLayer())->i2doc_affine().inverse();
            if(!pathv.empty()) {
                setMeasureItem(pathv, true, false, 0xff00007f, measure_repr);
            }
        }
    }
}

}  // namespace

boost::optional<Geom::Point> explicit_base_tmp = boost::none;

MeasureTool::MeasureTool()
    : ToolBase(cursor_measure_xpm, 4, 4)
    , grabbed(NULL)
{
    SPDesktop *desktop = SP_ACTIVE_DESKTOP;
    start_p = readMeasurePoint(true);
    end_p = readMeasurePoint(false);
    dimension_offset = 35;
    // create the knots
    this->knot_start = new SPKnot(desktop, _("Measure start, <b>Shift+Click</b> for position dialog"));
    this->knot_start->setMode(SP_KNOT_MODE_XOR);
    this->knot_start->setFill(MT_KNOT_COLOR_NORMAL, MT_KNOT_COLOR_MOUSEOVER, MT_KNOT_COLOR_MOUSEOVER);
    this->knot_start->setStroke(0x0000007f, 0x0000007f, 0x0000007f);
    this->knot_start->setShape(SP_KNOT_SHAPE_CIRCLE);
    this->knot_start->updateCtrl();
    this->knot_end = new SPKnot(desktop, _("Measure end, <b>Shift+Click</b> for position dialog"));
    this->knot_end->setMode(SP_KNOT_MODE_XOR);
    this->knot_end->setFill(MT_KNOT_COLOR_NORMAL, MT_KNOT_COLOR_MOUSEOVER, MT_KNOT_COLOR_MOUSEOVER);
    this->knot_end->setStroke(0x0000007f, 0x0000007f, 0x0000007f);
    this->knot_end->setShape(SP_KNOT_SHAPE_CIRCLE);
    this->knot_end->updateCtrl();
    Geom::Rect display_area = desktop->get_display_area();
    if(display_area.interiorContains(start_p) && display_area.interiorContains(end_p) && end_p != Geom::Point()) {
        this->knot_start->moveto(start_p);
        this->knot_start->show();
        this->knot_end->moveto(end_p);
        this->knot_end->show();
        showCanvasItems();
    } else {
        start_p = Geom::Point(0,0);
        end_p = Geom::Point(0,0);
        writeMeasurePoint(start_p, true);
        writeMeasurePoint(end_p, false);
    }
    this->_knot_start_moved_connection = this->knot_start->moved_signal.connect(sigc::mem_fun(*this, &MeasureTool::knotStartMovedHandler));
    this->_knot_start_click_connection = this->knot_start->click_signal.connect(sigc::mem_fun(*this, &MeasureTool::knotClickHandler));
    this->_knot_start_ungrabbed_connection = this->knot_start->ungrabbed_signal.connect(sigc::mem_fun(*this, &MeasureTool::knotUngrabbedHandler));
    this->_knot_end_moved_connection = this->knot_end->moved_signal.connect(sigc::mem_fun(*this, &MeasureTool::knotEndMovedHandler));
    this->_knot_end_click_connection = this->knot_end->click_signal.connect(sigc::mem_fun(*this, &MeasureTool::knotClickHandler));
    this->_knot_end_ungrabbed_connection = this->knot_end->ungrabbed_signal.connect(sigc::mem_fun(*this, &MeasureTool::knotUngrabbedHandler));

}

MeasureTool::~MeasureTool()
{
    this->_knot_start_moved_connection.disconnect();
    this->_knot_start_ungrabbed_connection.disconnect();
    this->_knot_end_moved_connection.disconnect();
    this->_knot_end_ungrabbed_connection.disconnect();

    /* unref should call destroy */
    knot_unref(this->knot_start);
    knot_unref(this->knot_end);
    for (size_t idx = 0; idx < measure_tmp_items.size(); ++idx) {
        sp_canvas_item_destroy(measure_tmp_items[idx]);
    }
    measure_tmp_items.clear();
    for (size_t idx = 0; idx < measure_phantom_items.size(); ++idx) {
        sp_canvas_item_destroy(measure_phantom_items[idx]);
    }
    measure_phantom_items.clear();
}

Geom::Point MeasureTool::readMeasurePoint(bool is_start) {
    SPDesktop *desktop = SP_ACTIVE_DESKTOP;
    SPNamedView *namedview = desktop->namedview;
    if(!namedview) {
        return Geom::Point(Geom::infinity(),Geom::infinity());
    }
    char const * measure_point = is_start ? "inkscape:measure-start" : "inkscape:measure-end";
    char const * measure_point_data = namedview->getAttribute (measure_point);
    if(!measure_point_data) {
        measure_point_data = "0,0";
        namedview->setAttribute (measure_point, measure_point_data);
    }
    gchar ** strarray = g_strsplit(measure_point_data, ",", 2);
    double newx, newy;
    unsigned int success = sp_svg_number_read_d(strarray[0], &newx);
    success += sp_svg_number_read_d(strarray[1], &newy);
    g_strfreev (strarray);
    if (success == 2) {
        Geom::Point point_data(newx, newy);
        return point_data;
    }
    return Geom::Point(Geom::infinity(),Geom::infinity());

}

void MeasureTool::writeMeasurePoint(Geom::Point point, bool is_start) {
    SPDesktop *desktop = SP_ACTIVE_DESKTOP;
    SPNamedView *namedview = desktop->namedview;
    if(!namedview) {
        return;
    }
    std::stringstream meassure_point_str;
    meassure_point_str.imbue(std::locale::classic());
    meassure_point_str << point[Geom::X] << "," << point[Geom::Y];
    gchar const *measure_point = is_start ? "inkscape:measure-start" : "inkscape:measure-end";
    namedview->setAttribute (measure_point, meassure_point_str.str().c_str());
}

//This function is used to reverse the Measure, I do it in two steps because when move the knot the 
//start_ or the end_p are overwrite so I need the original values.
void MeasureTool::reverseKnots()
{
    Geom::Point start = start_p;
    Geom::Point end = end_p;
    this->knot_start->moveto(end);
    this->knot_start->show();
    this->knot_end->moveto(start);
    this->knot_end->show();
    start_p = end;
    end_p = start;
    this->showCanvasItems();
}

void MeasureTool::knotClickHandler(SPKnot *knot, guint state)
{
    if (state & GDK_SHIFT_MASK) {
        SPDesktop *desktop = SP_ACTIVE_DESKTOP;
        Inkscape::Preferences *prefs = Inkscape::Preferences::get();
        Glib::ustring const unit_name =  prefs->getString("/tools/measure/unit");
        explicit_base = explicit_base_tmp;
        Inkscape::UI::Dialogs::KnotPropertiesDialog::showDialog(desktop, knot, unit_name);
    }
}

void MeasureTool::knotStartMovedHandler(SPKnot */*knot*/, Geom::Point const &ppointer, guint state)
{
    Geom::Point point = this->knot_start->position();
    if (state & GDK_CONTROL_MASK) {
        spdc_endpoint_snap_rotation(this, point, end_p, state);
    } else if (!(state & GDK_SHIFT_MASK)) {
        SnapManager &snap_manager = desktop->namedview->snap_manager;
        snap_manager.setup(desktop);
        Inkscape::SnapCandidatePoint scp(point, Inkscape::SNAPSOURCE_OTHER_HANDLE);
        scp.addOrigin(this->knot_end->position());
        Inkscape::SnappedPoint sp = snap_manager.freeSnap(scp);
        point = sp.getPoint();
        snap_manager.unSetup();
    }
    if(start_p != point) {
        start_p = point;
        this->knot_start->moveto(start_p);
    }
    showCanvasItems();
}

void MeasureTool::knotEndMovedHandler(SPKnot */*knot*/, Geom::Point const &ppointer, guint state)
{
    Geom::Point point = this->knot_end->position();
    if (state & GDK_CONTROL_MASK) {
        spdc_endpoint_snap_rotation(this, point, start_p, state);
    } else if (!(state & GDK_SHIFT_MASK)) {
        SnapManager &snap_manager = desktop->namedview->snap_manager;
        snap_manager.setup(desktop);
        Inkscape::SnapCandidatePoint scp(point, Inkscape::SNAPSOURCE_OTHER_HANDLE);
        scp.addOrigin(this->knot_start->position());
        Inkscape::SnappedPoint sp = snap_manager.freeSnap(scp);
        point = sp.getPoint();
        snap_manager.unSetup();
    }
    if(end_p != point) {
        end_p = point;
        this->knot_end->moveto(end_p);
    }
    showCanvasItems();
}

void MeasureTool::knotUngrabbedHandler(SPKnot */*knot*/,  unsigned int state)
{
    this->knot_start->moveto(start_p);
    this->knot_end->moveto(end_p);
    showCanvasItems();
}


//todo: we need this function?
void MeasureTool::finish()
{
    this->enableGrDrag(false);

    if (this->grabbed) {
        sp_canvas_item_ungrab(this->grabbed, GDK_CURRENT_TIME);
        this->grabbed = NULL;
    }

    ToolBase::finish();
}

static void calculate_intersections(SPDesktop * /*desktop*/, SPItem* item, Geom::PathVector const &lineseg, SPCurve *curve, std::vector<double> &intersections)
{
    curve->transform(item->i2doc_affine());
    // Find all intersections of the control-line with this shape
    Geom::CrossingSet cs = Geom::crossings(lineseg, curve->get_pathvector());
    Geom::delete_duplicates(cs[0]);

    // Reconstruct and store the points of intersection
    Inkscape::Preferences *prefs = Inkscape::Preferences::get();
    bool show_hidden = prefs->getBool("/tools/measure/show_hidden", true);
    SPDesktop *desktop = SP_ACTIVE_DESKTOP;
    for (Geom::Crossings::const_iterator m = cs[0].begin(); m != cs[0].end(); ++m) {
        if (!show_hidden) {
            double eps = 0.0001;
            if (((*m).ta > eps &&
             item == desktop->getItemAtPoint(desktop->d2w(desktop->dt2doc(lineseg[0].pointAt((*m).ta - eps))), true, NULL)) ||
            ((*m).ta + eps < 1 &&
             item == desktop->getItemAtPoint(desktop->d2w(desktop->dt2doc(lineseg[0].pointAt((*m).ta + eps))), true, NULL))) {
                intersections.push_back((*m).ta);
            }
        } else {
            intersections.push_back((*m).ta);
        }
    }
}

bool MeasureTool::root_handler(GdkEvent* event)
{
    gint ret = FALSE;

    switch (event->type) {
    case GDK_BUTTON_PRESS: {
        this->knot_start->hide();
        this->knot_end->hide();
        Geom::Point const button_w(event->button.x, event->button.y);
        explicit_base = boost::none;
        explicit_base_tmp = boost::none;
        last_end = boost::none;

        if (event->button.button == 1 && !this->space_panning) {
            // save drag origin
            start_p = desktop->w2d(Geom::Point(event->button.x, event->button.y));
            within_tolerance = true;

            ret = TRUE;
        }

        SnapManager &snap_manager = desktop->namedview->snap_manager;
        snap_manager.setup(desktop);
        snap_manager.freeSnapReturnByRef(start_p, Inkscape::SNAPSOURCE_OTHER_HANDLE);
        snap_manager.unSetup();

        sp_canvas_item_grab(SP_CANVAS_ITEM(desktop->acetate),
                            GDK_KEY_PRESS_MASK | GDK_KEY_RELEASE_MASK | GDK_BUTTON_RELEASE_MASK | GDK_POINTER_MOTION_MASK | GDK_POINTER_MOTION_HINT_MASK | GDK_BUTTON_PRESS_MASK,
                            NULL, event->button.time);
        this->grabbed = SP_CANVAS_ITEM(desktop->acetate);
        break;
    }
    case GDK_KEY_PRESS: {
        if ((event->key.keyval == GDK_KEY_Shift_L) || (event->key.keyval == GDK_KEY_Shift_R)) {
            explicit_base_tmp = explicit_base;
            explicit_base = end_p;
        }
        break;
    }
    case GDK_MOTION_NOTIFY: {
        if (!(event->motion.state & GDK_BUTTON1_MASK)) {
            if(!(event->motion.state & GDK_SHIFT_MASK)) {
                Geom::Point const motion_w(event->motion.x, event->motion.y);
                Geom::Point const motion_dt(desktop->w2d(motion_w));

                SnapManager &snap_manager = desktop->namedview->snap_manager;
                snap_manager.setup(desktop);

                Inkscape::SnapCandidatePoint scp(motion_dt, Inkscape::SNAPSOURCE_OTHER_HANDLE);
                scp.addOrigin(start_p);

                snap_manager.preSnap(scp);
                snap_manager.unSetup();
            }
        } else {
            ret = TRUE;
            Inkscape::Preferences *prefs = Inkscape::Preferences::get();
            tolerance = prefs->getIntLimited("/options/dragtolerance/value", 0, 0, 100);
            Geom::Point const motion_w(event->motion.x, event->motion.y);
            if ( within_tolerance) {
                if ( Geom::LInfty( motion_w - start_p ) < tolerance) {
                    return FALSE;   // Do not drag if we're within tolerance from origin.
                }
            }
            // Once the user has moved farther than tolerance from the original location
            // (indicating they intend to move the object, not click), then always process the
            // motion notify coordinates as given (no snapping back to origin)
            within_tolerance = false;
            if(event->motion.time == 0 || !last_end  || Geom::LInfty( motion_w - *last_end ) > (tolerance/4.0)) {
                Geom::Point const motion_dt(desktop->w2d(motion_w));
                end_p = motion_dt;

                if (event->motion.state & GDK_CONTROL_MASK) {
                    spdc_endpoint_snap_rotation(this, end_p, start_p, event->motion.state);
                } else if (!(event->motion.state & GDK_SHIFT_MASK)) {
                    SnapManager &snap_manager = desktop->namedview->snap_manager;
                    snap_manager.setup(desktop);
                    Inkscape::SnapCandidatePoint scp(end_p, Inkscape::SNAPSOURCE_OTHER_HANDLE);
                    scp.addOrigin(start_p);
                    Inkscape::SnappedPoint sp = snap_manager.freeSnap(scp);
                    end_p = sp.getPoint();
                    snap_manager.unSetup();
                }
                showCanvasItems();
                last_end = motion_w ;
            }
            gobble_motion_events(GDK_BUTTON1_MASK);
        }
        break;
    }
    case GDK_BUTTON_RELEASE: {
        this->knot_start->moveto(start_p);
        this->knot_start->show();
        if(last_end) {
            end_p = desktop->w2d(*last_end);
            if (event->button.state & GDK_CONTROL_MASK) {
                spdc_endpoint_snap_rotation(this, end_p, start_p, event->motion.state);
            } else if (!(event->button.state & GDK_SHIFT_MASK)) {
                SnapManager &snap_manager = desktop->namedview->snap_manager;
                snap_manager.setup(desktop);
                Inkscape::SnapCandidatePoint scp(end_p, Inkscape::SNAPSOURCE_OTHER_HANDLE);
                scp.addOrigin(start_p);
                Inkscape::SnappedPoint sp = snap_manager.freeSnap(scp);
                end_p = sp.getPoint();
                snap_manager.unSetup();
            }
        }
        this->knot_end->moveto(end_p);
        this->knot_end->show();
        showCanvasItems();

        if (this->grabbed) {
            sp_canvas_item_ungrab(this->grabbed, event->button.time);
            this->grabbed = NULL;
        }
        break;
    }
    default:
        break;
    }
    if (!ret) {
        ret = ToolBase::root_handler(event);
    }

    return ret;
}

void MeasureTool::setMarkers()
{
    SPDesktop *desktop = SP_ACTIVE_DESKTOP;
    SPDocument *doc = desktop->getDocument();
    SPObject *arrowStart = doc->getObjectById("Arrow2Sstart");
    SPObject *arrowEnd = doc->getObjectById("Arrow2Send");
    if (!arrowStart) {
        setMarker(true);
    }
    if(!arrowEnd) {
        setMarker(false);
    }
}
void MeasureTool::setMarker(bool isStart)
{
    SPDesktop *desktop = SP_ACTIVE_DESKTOP;
    SPDocument *doc = desktop->getDocument();
    SPDefs *defs = doc->getDefs();
    Inkscape::XML::Node *rmarker;
    Inkscape::XML::Document *xml_doc = doc->getReprDoc();
    rmarker = xml_doc->createElement("svg:marker");
    rmarker->setAttribute("id", isStart ? "Arrow2Sstart" : "Arrow2Send");
    rmarker->setAttribute("inkscape:isstock", "true");
    rmarker->setAttribute("inkscape:stockid", isStart ? "Arrow2Sstart" : "Arrow2Send");
    rmarker->setAttribute("orient", "auto");
    rmarker->setAttribute("refX", "0.0");
    rmarker->setAttribute("refY", "0.0");
    rmarker->setAttribute("style", "overflow:visible;");
    SPItem *marker = SP_ITEM(defs->appendChildRepr(rmarker));
    Inkscape::GC::release(rmarker);
    marker->updateRepr();
    Inkscape::XML::Node *rpath;
    rpath = xml_doc->createElement("svg:path");
    rpath->setAttribute("d", "M 8.72,4.03 L -2.21,0.02 L 8.72,-4.00 C 6.97,-1.63 6.98,1.62 8.72,4.03 z");
    rpath->setAttribute("id", isStart ? "Arrow2SstartPath" : "Arrow2SendPath");
    SPCSSAttr *css = sp_repr_css_attr_new();
    sp_repr_css_set_property (css, "stroke", "none");
    sp_repr_css_set_property (css, "fill", "#000000");
    sp_repr_css_set_property (css, "fill-opacity", "1");
    Glib::ustring css_str;
    sp_repr_css_write_string(css,css_str);
    rpath->setAttribute("style", css_str.c_str());
    sp_repr_css_attr_unref (css);
    rpath->setAttribute("transform", isStart ? "scale(0.3) translate(-2.3,0)" : "scale(0.3) rotate(180) translate(-2.3,0)");
    SPItem *path = SP_ITEM(marker->appendChildRepr(rpath));
    Inkscape::GC::release(rpath);
    path->updateRepr();
}

void MeasureTool::toGuides()
{
    SPDesktop *desktop = SP_ACTIVE_DESKTOP;
    if(!desktop || !start_p.isFinite() || !end_p.isFinite() || start_p == end_p) {
        return;
    }
    SPDocument *doc = desktop->getDocument();
    Geom::Point start = desktop->doc2dt(start_p) * desktop->doc2dt();
    Geom::Point end = desktop->doc2dt(end_p) * desktop->doc2dt();
    Geom::Ray ray(start,end);
    SPNamedView *namedview = desktop->namedview;
    if(!namedview) {
        return;
    }
    setGuide(start,ray.angle(), _("Measure"));
    if(explicit_base) {
        explicit_base = *explicit_base * SP_ITEM(desktop->currentLayer())->i2doc_affine().inverse();
        ray.setPoints(start, *explicit_base);
        if(ray.angle() != 0) {
            setGuide(start,ray.angle(), _("Base"));
        }
    }
    setGuide(start,0,"");
    setGuide(start,Geom::rad_from_deg(90),_("Start"));
    setGuide(end,0,_("End"));
    setGuide(end,Geom::rad_from_deg(90),"");
    showCanvasItems(true);
    doc->ensureUpToDate();
    DocumentUndo::done(desktop->getDocument(), SP_VERB_CONTEXT_MEASURE,_("Add guides from measure tool"));
}

void MeasureTool::toPhantom()
{
    SPDesktop *desktop = SP_ACTIVE_DESKTOP;
    if(!desktop || !start_p.isFinite() || !end_p.isFinite() || start_p == end_p) {
        return;
    }
    SPDocument *doc = desktop->getDocument();
    for (size_t idx = 0; idx < measure_phantom_items.size(); ++idx) {
        sp_canvas_item_destroy(measure_phantom_items[idx]);
    }
    measure_phantom_items.clear();
    for (size_t idx = 0; idx < measure_tmp_items.size(); ++idx) {
        sp_canvas_item_destroy(measure_tmp_items[idx]);
    }
    measure_tmp_items.clear();
    showCanvasItems(false, false, true);
    doc->ensureUpToDate();
    DocumentUndo::done(desktop->getDocument(), SP_VERB_CONTEXT_MEASURE,_("Keep last measure on the canvas, for reference"));
}

void MeasureTool::toItem()
{
    SPDesktop *desktop = SP_ACTIVE_DESKTOP;
    if(!desktop || !start_p.isFinite() || !end_p.isFinite() || start_p == end_p) {
        return;
    }
    SPDocument *doc = desktop->getDocument();
    Geom::Ray ray(start_p,end_p);
    guint32 line_color_primary = 0x0000ff7f;
    Inkscape::XML::Document *xml_doc = desktop->doc()->getReprDoc();
    Inkscape::XML::Node *rgroup = xml_doc->createElement("svg:g");
    showCanvasItems(false, true, false, rgroup);
    setLine(start_p,end_p, false, line_color_primary, rgroup);
    SPItem *measure_item = SP_ITEM(desktop->currentLayer()->appendChildRepr(rgroup));
    Inkscape::GC::release(rgroup);
    measure_item->updateRepr();
    doc->ensureUpToDate();
    DocumentUndo::done(desktop->getDocument(), SP_VERB_CONTEXT_MEASURE,_("Convert measure to items"));
    reset();
}

void MeasureTool::toMarkDimension()
{
    SPDesktop *desktop = SP_ACTIVE_DESKTOP;
    if(!desktop || !start_p.isFinite() || !end_p.isFinite() || start_p == end_p) {
        return;
    }
    SPDocument *doc = desktop->getDocument();
    setMarkers();
    Geom::Ray ray(start_p,end_p);
    Geom::Point start = start_p + Geom::Point::polar(ray.angle(), 5);
    Inkscape::Preferences *prefs = Inkscape::Preferences::get();
    dimension_offset = prefs->getDouble("/tools/measure/offset", 5.0);
    start = start + Geom::Point::polar(ray.angle() + Geom::rad_from_deg(90), -dimension_offset);
    Geom::Point end = end_p + Geom::Point::polar(ray.angle(), -5);
    end = end+ Geom::Point::polar(ray.angle() + Geom::rad_from_deg(90), -dimension_offset);
    guint32 color = 0x000000ff;
    setLine(start, end, true, color);
    Glib::ustring unit_name = prefs->getString("/tools/measure/unit");
    if (!unit_name.compare("")) {
        unit_name = "px";
    }
    double fontsize = prefs->getDouble("/tools/measure/fontsize", 10.0);
    int precision = prefs->getInt("/tools/measure/precision", 2);
    std::stringstream precision_str;
    precision_str.imbue(std::locale::classic());
    precision_str <<  "%." << precision << "f %s";
    Geom::Point middle = Geom::middle_point(start, end);
    double totallengthval = (end_p - start_p).length();
    totallengthval = Inkscape::Util::Quantity::convert(totallengthval, "px", unit_name);
    double scale = prefs->getDouble("/tools/measure/scale", 100.0) / 100.0;
    gchar *totallength_str = g_strdup_printf(precision_str.str().c_str(), totallengthval * scale, unit_name.c_str());
    setLabelText(totallength_str, middle, fontsize, Geom::rad_from_deg(180) - ray.angle(), color);
    g_free(totallength_str);
    doc->ensureUpToDate();
    DocumentUndo::done(desktop->getDocument(), SP_VERB_CONTEXT_MEASURE,_("Add global measure line"));
}

void MeasureTool::setGuide(Geom::Point origin,double angle, const char *label)
{
    SPDesktop *desktop = SP_ACTIVE_DESKTOP;
    SPDocument *doc = desktop->getDocument();
    Inkscape::XML::Document *xml_doc = doc->getReprDoc();
    SPRoot const *root = doc->getRoot();
    Geom::Affine affine(Geom::identity());
    if(root) {
        affine *= root->c2p.inverse();
    }
    SPNamedView *namedview = desktop->namedview;
    if(!namedview) {
        return;
    }
    origin *= affine; 
    //measure angle
    Inkscape::XML::Node *guide;
    guide = xml_doc->createElement("sodipodi:guide");
    std::stringstream position;
    position.imbue(std::locale::classic());
    position <<  origin[Geom::X] << "," << origin[Geom::Y];
    guide->setAttribute("position", position.str().c_str() );
    guide->setAttribute("inkscape:color", "rgb(167,0,255)");
    guide->setAttribute("inkscape:label", label);
    Geom::Point unit_vector = Geom::rot90(origin.polar(angle));
    std::stringstream angle_str;
    angle_str.imbue(std::locale::classic());
    angle_str << unit_vector[Geom::X] << "," << unit_vector[Geom::Y];
    guide->setAttribute("orientation", angle_str.str().c_str());
    namedview->appendChild(guide);
    Inkscape::GC::release(guide);
}

void MeasureTool::setLine(Geom::Point start_point,Geom::Point end_point, bool markers, guint32 color, Inkscape::XML::Node *measure_repr)
{
    SPDesktop *desktop = SP_ACTIVE_DESKTOP;
    if(!desktop || !start_p.isFinite() || !end_p.isFinite()) {
        return;
    }
    Geom::PathVector pathv;
    Geom::Path path;
    path.start(desktop->doc2dt(start_point));
    path.appendNew<Geom::LineSegment>(desktop->doc2dt(end_point));
    pathv.push_back(path);
    pathv *= SP_ITEM(desktop->currentLayer())->i2doc_affine().inverse();
    if(!pathv.empty()) {
        setMeasureItem(pathv, false, markers, color, measure_repr);
    }
}

void MeasureTool::setPoint(Geom::Point origin, Inkscape::XML::Node *measure_repr)
{
    SPDesktop *desktop = SP_ACTIVE_DESKTOP;
    if(!desktop || !origin.isFinite()) {
        return;
    }
    char const * svgd;
    svgd = "m 0.707,0.707 6.586,6.586 m 0,-6.586 -6.586,6.586";
    Geom::PathVector pathv = sp_svg_read_pathv(svgd);
    Geom::Scale scale = Geom::Scale(desktop->current_zoom()).inverse();
    pathv *= Geom::Translate(Geom::Point(-3.5,-3.5));
    pathv *= scale;
    pathv *= Geom::Translate(Geom::Point() - (scale.vector() * 0.5));
    pathv *= Geom::Translate(desktop->doc2dt(origin));
    pathv *= SP_ITEM(desktop->currentLayer())->i2doc_affine().inverse();
    if (!pathv.empty()) {
        guint32 line_color_secondary = 0xff0000ff;
        setMeasureItem(pathv, false, false, line_color_secondary, measure_repr);
    }
}

void MeasureTool::setLabelText(const char *value, Geom::Point pos, double fontsize, Geom::Coord angle, guint32 background, Inkscape::XML::Node *measure_repr, CanvasTextAnchorPositionEnum text_anchor)
{
    SPDesktop *desktop = SP_ACTIVE_DESKTOP;
    Inkscape::XML::Document *xml_doc = desktop->doc()->getReprDoc();
    /* Create <text> */
    pos = desktop->doc2dt(pos);
    Inkscape::XML::Node *rtext = xml_doc->createElement("svg:text");
    rtext->setAttribute("xml:space", "preserve");


    /* Set style */
    sp_desktop_apply_style_tool(desktop, rtext, "/tools/text", true);
    if(measure_repr) {
        sp_repr_set_svg_double(rtext, "x", 2);
        sp_repr_set_svg_double(rtext, "y", 2);
    } else {
        sp_repr_set_svg_double(rtext, "x", 0);
        sp_repr_set_svg_double(rtext, "y", 0);
    }

    /* Create <tspan> */
    Inkscape::XML::Node *rtspan = xml_doc->createElement("svg:tspan");
    rtspan->setAttribute("sodipodi:role", "line");
    SPCSSAttr *css = sp_repr_css_attr_new();
    std::stringstream font_size;
    font_size.imbue(std::locale::classic());
    if(measure_repr) {
        font_size <<  fontsize;
    } else {
        font_size <<  fontsize << "pt";
    }
    sp_repr_css_set_property (css, "font-size", font_size.str().c_str());
    sp_repr_css_set_property (css, "font-style", "normal");
    sp_repr_css_set_property (css, "font-weight", "normal");
    sp_repr_css_set_property (css, "line-height", "125%");
    sp_repr_css_set_property (css, "letter-spacing", "0");
    sp_repr_css_set_property (css, "word-spacing", "0");
    sp_repr_css_set_property (css, "text-align", "center");
    sp_repr_css_set_property (css, "text-anchor", "middle");
    if(measure_repr) {
        sp_repr_css_set_property (css, "fill", "#FFFFFF");
    } else {
        sp_repr_css_set_property (css, "fill", "#000000");
    }
    sp_repr_css_set_property (css, "fill-opacity", "1");
    sp_repr_css_set_property (css, "stroke", "none");
    Glib::ustring css_str;
    sp_repr_css_write_string(css,css_str);
    rtspan->setAttribute("style", css_str.c_str());
    sp_repr_css_attr_unref (css);
    rtext->addChild(rtspan, NULL);
    Inkscape::GC::release(rtspan);
    /* Create TEXT */
    Inkscape::XML::Node *rstring = xml_doc->createTextNode(value);
    rtspan->addChild(rstring, NULL);
    Inkscape::GC::release(rstring);
    SPItem *text_item = SP_ITEM(desktop->currentLayer()->appendChildRepr(rtext));
    Inkscape::GC::release(rtext);
    text_item->updateRepr();
    Geom::OptRect bbox = text_item->geometricBounds();
    if (!measure_repr && bbox) {
        Geom::Point center = bbox->midpoint();
        text_item->transform *= Geom::Translate(center).inverse();
        pos += Geom::Point::polar(angle+ Geom::rad_from_deg(90), -bbox->height());
    }
    if(measure_repr) {
        /* Create <group> */
        Inkscape::XML::Node *rgroup = xml_doc->createElement("svg:g");
        /* Create <rect> */
        Inkscape::XML::Node *rrect = xml_doc->createElement("svg:rect");
        SPCSSAttr *css = sp_repr_css_attr_new ();
        gchar color_line[64];
        sp_svg_write_color (color_line, sizeof(color_line), background);
        sp_repr_css_set_property (css, "fill", color_line);
        sp_repr_css_set_property (css, "fill-opacity", "0.5");
        sp_repr_css_set_property (css, "stroke-width", "0");
        Glib::ustring css_str;
        sp_repr_css_write_string(css,css_str);
        rrect->setAttribute("style", css_str.c_str());
        sp_repr_css_attr_unref (css);
        sp_repr_set_svg_double(rgroup, "x", 0);
        sp_repr_set_svg_double(rgroup, "y", 0);
        sp_repr_set_svg_double(rrect, "x", -bbox->width()/2.0);
        sp_repr_set_svg_double(rrect, "y", -bbox->height());
        sp_repr_set_svg_double(rrect, "width", bbox->width() + 6);
        sp_repr_set_svg_double(rrect, "height", bbox->height() + 6);
        Inkscape::XML::Node *rtextitem = text_item->getRepr();
        text_item->deleteObject();
        rgroup->addChild(rtextitem, NULL);
        Inkscape::GC::release(rtextitem);
        rgroup->addChild(rrect, NULL);
        Inkscape::GC::release(rrect);
        SPItem *text_item_box = SP_ITEM(desktop->currentLayer()->appendChildRepr(rgroup));
        Geom::Scale scale = Geom::Scale(desktop->current_zoom()).inverse();
        if(bbox && text_anchor == TEXT_ANCHOR_CENTER) {
            text_item_box->transform *= Geom::Translate(bbox->midpoint() - Geom::Point(1.0,1.0)).inverse();
        }
        text_item_box->transform *= scale;
        text_item_box->transform *= Geom::Translate(Geom::Point() - (scale.vector() * 0.5));
        text_item_box->transform *= Geom::Translate(pos);
        text_item_box->transform *= SP_ITEM(desktop->currentLayer())->i2doc_affine().inverse();
        text_item_box->updateRepr();
        text_item_box->doWriteTransform(text_item_box->getRepr(), text_item_box->transform, NULL, true);
        Inkscape::XML::Node *rlabel = text_item_box->getRepr();
        text_item_box->deleteObject();
        measure_repr->addChild(rlabel, NULL);
        Inkscape::GC::release(rlabel);
    } else {
        text_item->transform *= Geom::Rotate(angle);
        text_item->transform *= Geom::Translate(pos);
        text_item->transform *= SP_ITEM(desktop->currentLayer())->i2doc_affine().inverse();
        text_item->doWriteTransform(text_item->getRepr(), text_item->transform, NULL, true);
    }
}

void MeasureTool::reset()
{
    this->knot_start->hide();
    this->knot_end->hide();
    for (size_t idx = 0; idx < measure_tmp_items.size(); ++idx) {
        sp_canvas_item_destroy(measure_tmp_items[idx]);
    }
    measure_tmp_items.clear();
}

void MeasureTool::setMeasureCanvasText(bool is_angle, double precision, double amount, double fontsize, Glib::ustring unit_name, Geom::Point position, guint32 background, CanvasTextAnchorPositionEnum text_anchor, bool to_item, bool to_phantom, Inkscape::XML::Node *measure_repr)
{
    SPDesktop *desktop = SP_ACTIVE_DESKTOP;
    std::stringstream precision_str;
    precision_str.imbue(std::locale::classic());
    if(is_angle){
        precision_str << "%." << precision << "f °";
    } else {
        precision_str << "%." << precision << "f %s";
    }
    gchar *measure_str = g_strdup_printf(precision_str.str().c_str(), amount, unit_name.c_str());
    SPCanvasText *canvas_tooltip = sp_canvastext_new(desktop->getTempGroup(),
                                   desktop,
                                   position,
                                   measure_str);
    sp_canvastext_set_fontsize(canvas_tooltip, fontsize);
    canvas_tooltip->rgba = 0xffffffff;
    canvas_tooltip->rgba_background = background;
    canvas_tooltip->outline = false;
    canvas_tooltip->background = true;
    canvas_tooltip->anchor_position = text_anchor;
    if(to_phantom){
        canvas_tooltip->rgba_background = 0x4444447f;
        measure_phantom_items.push_back(SP_CANVAS_ITEM(canvas_tooltip));
        sp_canvas_item_show(SP_CANVAS_ITEM(canvas_tooltip));
    } else {
        measure_tmp_items.push_back(SP_CANVAS_ITEM(canvas_tooltip));
        sp_canvas_item_show(SP_CANVAS_ITEM(canvas_tooltip));
    }

    if(to_item) {
        setLabelText(measure_str, position, fontsize, 0, background, measure_repr);
    }
    g_free(measure_str);
}

void MeasureTool::setMeasureCanvasItem(Geom::Point position, bool to_item, bool to_phantom, Inkscape::XML::Node *measure_repr){
    SPDesktop *desktop = SP_ACTIVE_DESKTOP;
    guint32 color = 0xff0000ff;
    if(to_phantom){
        color = 0x888888ff;
    }
    SPCanvasItem * canvasitem = sp_canvas_item_new(desktop->getTempGroup(),
        SP_TYPE_CTRL,
        "anchor", SP_ANCHOR_CENTER,
        "size", 8.0,
        "stroked", TRUE,
        "stroke_color", color,
        "mode", SP_KNOT_MODE_XOR,
        "shape", SP_KNOT_SHAPE_CROSS,
        NULL );

    SP_CTRL(canvasitem)->moveto(position);
    if(to_phantom){
        measure_phantom_items.push_back(canvasitem);
    } else {
        measure_tmp_items.push_back(canvasitem);
    }
    sp_canvas_item_show(canvasitem);
    sp_canvas_item_move_to_z(canvasitem, 0);
    
    if(to_item) {
        setPoint(position, measure_repr);
    }
}

void MeasureTool::setMeasureCanvasControlLine(Geom::Point start, Geom::Point end, bool to_item, bool to_phantom, Inkscape::CtrlLineType ctrl_line_type, Inkscape::XML::Node *measure_repr){
        SPDesktop *desktop = SP_ACTIVE_DESKTOP;
        gint32 color = ctrl_line_type == CTLINE_PRIMARY ? 0x0000ff7f : 0xff00007f;
        if(to_phantom){
            color  = ctrl_line_type == CTLINE_PRIMARY ? 0x4444447f : 0x8888887f;
        }
        SPCtrlLine *control_line = ControlManager::getManager().createControlLine(desktop->getTempGroup(),
                                   start,
                                   end,
                                   ctrl_line_type);
        control_line->rgba = color;
        if(to_phantom){
            measure_phantom_items.push_back(SP_CANVAS_ITEM(control_line));
        } else {
            measure_tmp_items.push_back(SP_CANVAS_ITEM(control_line));
        }
        sp_canvas_item_move_to_z(SP_CANVAS_ITEM(control_line), 0);
        sp_canvas_item_show(SP_CANVAS_ITEM(control_line));
        if(to_item) {
            setLine(start,
                    end,
                    false,
                    color,
                    measure_repr);
        }
}

void MeasureTool::showCanvasItems(bool to_guides, bool to_item, bool to_phantom, Inkscape::XML::Node *measure_repr)
{
    SPDesktop *desktop = SP_ACTIVE_DESKTOP;
    if(!desktop || !start_p.isFinite() || !end_p.isFinite() || start_p == end_p) {
        return;
    }
    writeMeasurePoint(start_p, true);
    writeMeasurePoint(end_p, false);
    //clear previous canvas items, we'll draw new ones
    for (size_t idx = 0; idx < measure_tmp_items.size(); ++idx) {
        sp_canvas_item_destroy(measure_tmp_items[idx]);
    }
    measure_tmp_items.clear();
    //TODO:Calculate the measure area for current lenght and origin
    // and use canvas->requestRedraw. In the calculation need a gap for outside text
    // maybe this remove the trash lines on measure use
    Inkscape::Preferences *prefs = Inkscape::Preferences::get();
    bool show_in_between = prefs->getBool("/tools/measure/show_in_between", true);
    bool all_layers = prefs->getBool("/tools/measure/all_layers", true);
    dimension_offset = 70;
    Geom::PathVector lineseg;
    Geom::Path p;
    p.start(desktop->dt2doc(start_p));
    p.appendNew<Geom::LineSegment>(desktop->dt2doc(end_p));
    lineseg.push_back(p);

    double angle = atan2(end_p - start_p);
    double baseAngle = 0;

    if (explicit_base) {
        baseAngle = atan2(explicit_base.get() - start_p);
        angle -= baseAngle;
    }

    std::vector<SPItem*> items;
    SPDocument *doc = desktop->getDocument();
    Geom::Rect rect(start_p, end_p);
    items = doc->getItemsPartiallyInBox(desktop->dkey, rect, true);
    Inkscape::LayerModel *layer_model = NULL;
    SPObject *current_layer = NULL;
    if(desktop){
        layer_model = desktop->layers;
        current_layer = desktop->currentLayer();
    }
    std::vector<double> intersection_times;
    for (std::vector<SPItem*>::const_iterator i=items.begin(); i!=items.end(); ++i) {
        SPItem *item = *i;
        if(all_layers || (layer_model && layer_model->layerForObject(item) == current_layer)){
            if (SP_IS_SHAPE(item)) {
                calculate_intersections(desktop, item, lineseg, SP_SHAPE(item)->getCurve(), intersection_times);
            } else {
                if (SP_IS_TEXT(item) || SP_IS_FLOWTEXT(item)) {
                    Inkscape::Text::Layout::iterator iter = te_get_layout(item)->begin();
                    do {
                        Inkscape::Text::Layout::iterator iter_next = iter;
                        iter_next.nextGlyph(); // iter_next is one glyph ahead from iter
                        if (iter == iter_next) {
                            break;
                        }

                        // get path from iter to iter_next:
                        SPCurve *curve = te_get_layout(item)->convertToCurves(iter, iter_next);
                        iter = iter_next; // shift to next glyph
                        if (!curve) {
                            continue; // error converting this glyph
                        }
                        if (curve->is_empty()) { // whitespace glyph?
                            curve->unref();
                            continue;
                        }
                        curve->transform(item->transform);

                        calculate_intersections(desktop, item, lineseg, curve, intersection_times);
                        if (iter == te_get_layout(item)->end()) {
                            break;
                        }
                    } while (true);
                }
            }
        }
    }
    Glib::ustring unit_name = prefs->getString("/tools/measure/unit");
    if (!unit_name.compare("")) {
        unit_name = "px";
    }
    double scale = prefs->getDouble("/tools/measure/scale", 100.0) / 100.0;
    double fontsize = prefs->getDouble("/tools/measure/fontsize", 10.0);
    // Normal will be used for lines and text
    Geom::Point windowNormal = Geom::unit_vector(Geom::rot90(desktop->d2w(end_p - start_p)));
    Geom::Point normal = desktop->w2d(windowNormal);

    std::vector<Geom::Point> intersections;
    std::sort(intersection_times.begin(), intersection_times.end());
    for (std::vector<double>::iterator iter_t = intersection_times.begin(); iter_t != intersection_times.end(); ++iter_t) {
        intersections.push_back(lineseg[0].pointAt(*iter_t));
    }

    if(!show_in_between && intersection_times.size() > 1) {
        Geom::Point start = lineseg[0].pointAt(intersection_times[0]);
        Geom::Point end = lineseg[0].pointAt(intersection_times[intersection_times.size()-1]);
        intersections.clear();
        intersections.push_back(start);
        intersections.push_back(end);
    }
    if (!prefs->getBool("/tools/measure/ignore_1st_and_last", true)) {
        intersections.insert(intersections.begin(),lineseg[0].pointAt(0));
        intersections.push_back(lineseg[0].pointAt(1));
    }
    std::vector<LabelPlacement> placements;
    for (size_t idx = 1; idx < intersections.size(); ++idx) {
        LabelPlacement placement;
        placement.lengthVal = (intersections[idx] - intersections[idx - 1]).length();
        placement.lengthVal = Inkscape::Util::Quantity::convert(placement.lengthVal, "px", unit_name);
        placement.offset = dimension_offset / 2;
        placement.start = desktop->doc2dt( (intersections[idx - 1] + intersections[idx]) / 2 );
        placement.end = placement.start - (normal * placement.offset);

        placements.push_back(placement);
    }
    int precision = prefs->getInt("/tools/measure/precision", 2);
    // Adjust positions
    repositionOverlappingLabels(placements, desktop, windowNormal, fontsize, precision);
    for (std::vector<LabelPlacement>::iterator it = placements.begin(); it != placements.end(); ++it) {
        LabelPlacement &place = *it;
        
        setMeasureCanvasText(false, precision, place.lengthVal * scale, fontsize, unit_name, place.end, 0x0000007f, TEXT_ANCHOR_CENTER, to_item, to_phantom, measure_repr);
    }
    Geom::Point angleDisplayPt = calcAngleDisplayAnchor(desktop, angle, baseAngle,
                                 start_p, end_p,
                                 fontsize);
    {
        setMeasureCanvasText(true, precision, Geom::deg_from_rad(angle), fontsize, unit_name, angleDisplayPt, 0x337f337f, TEXT_ANCHOR_CENTER, to_item, to_phantom, measure_repr);
    }

    {
        double totallengthval = (end_p - start_p).length();
        totallengthval = Inkscape::Util::Quantity::convert(totallengthval, "px", unit_name);
        Geom::Point origin = end_p + desktop->w2d(Geom::Point(3*fontsize, -fontsize));
        setMeasureCanvasText(false, precision, totallengthval * scale, fontsize, unit_name, origin, 0x3333337f, TEXT_ANCHOR_LEFT, to_item, to_phantom, measure_repr);
    }

    if (intersections.size() > 2) {
        double totallengthval = (intersections[intersections.size()-1] - intersections[0]).length();
        totallengthval = Inkscape::Util::Quantity::convert(totallengthval, "px", unit_name);
        Geom::Point origin = desktop->doc2dt((intersections[0] + intersections[intersections.size()-1])/2) + normal * dimension_offset;
        setMeasureCanvasText(false, precision, totallengthval * scale, fontsize, unit_name, origin, 0x33337f7f, TEXT_ANCHOR_CENTER, to_item, to_phantom, measure_repr);
    }

    // Initial point
    {
        setMeasureCanvasItem(start_p, false, to_phantom, measure_repr);
    }

    // Now that text has been added, we can add lines and controls so that they go underneath
    for (size_t idx = 0; idx < intersections.size(); ++idx) {
        setMeasureCanvasItem(desktop->doc2dt(intersections[idx]), to_item, to_phantom, measure_repr);
        if(to_guides) {
            gchar *cross_number;
            if (!prefs->getBool("/tools/measure/ignore_1st_and_last", true)) {
                cross_number= g_strdup_printf(_("Crossing %lu"), static_cast<unsigned long>(idx));
            } else {
                cross_number= g_strdup_printf(_("Crossing %lu"), static_cast<unsigned long>(idx + 1));
            }
            if (!prefs->getBool("/tools/measure/ignore_1st_and_last", true) && idx == 0) {
                setGuide(desktop->doc2dt(intersections[idx]), angle + Geom::rad_from_deg(90), "");
            } else {
                setGuide(desktop->doc2dt(intersections[idx]), angle + Geom::rad_from_deg(90), cross_number);
            }
            g_free(cross_number);
        }
    }
    // Since adding goes to the bottom, do all lines last.

    // draw main control line
    {
        setMeasureCanvasControlLine(start_p, end_p, false, to_phantom, CTLINE_PRIMARY, measure_repr);
        double length = std::abs((end_p - start_p).length());
        Geom::Point anchorEnd = start_p;
        anchorEnd[Geom::X] += length;
        if (explicit_base) {
            anchorEnd *= (Geom::Affine(Geom::Translate(-start_p))
                          * Geom::Affine(Geom::Rotate(baseAngle))
                          * Geom::Affine(Geom::Translate(start_p)));
        }
        setMeasureCanvasControlLine(start_p, anchorEnd, to_item, to_phantom, CTLINE_SECONDARY, measure_repr);
        createAngleDisplayCurve(desktop, start_p, end_p, angleDisplayPt, angle, to_phantom, measure_phantom_items, measure_tmp_items, measure_repr);
    }

    if (intersections.size() > 2) {
        setMeasureCanvasControlLine(desktop->doc2dt(intersections[0]) + normal * dimension_offset, desktop->doc2dt(intersections[intersections.size() - 1]) + normal * dimension_offset, to_item, to_phantom, CTLINE_PRIMARY , measure_repr);
        
        setMeasureCanvasControlLine(desktop->doc2dt(intersections[0]), desktop->doc2dt(intersections[0]) + normal * dimension_offset, to_item, to_phantom, CTLINE_PRIMARY , measure_repr);

        setMeasureCanvasControlLine(desktop->doc2dt(intersections[intersections.size() - 1]), desktop->doc2dt(intersections[intersections.size() - 1]) + normal * dimension_offset, to_item, to_phantom, CTLINE_PRIMARY , measure_repr);
    }

    // call-out lines
    for (std::vector<LabelPlacement>::iterator it = placements.begin(); it != placements.end(); ++it) {
        LabelPlacement &place = *it;
        setMeasureCanvasControlLine(place.start, place.end, to_item, to_phantom, CTLINE_SECONDARY, measure_repr);
    }

    {
        for (size_t idx = 1; idx < intersections.size(); ++idx) {
            Geom::Point measure_text_pos = (intersections[idx - 1] + intersections[idx]) / 2;
            setMeasureCanvasControlLine(desktop->doc2dt(measure_text_pos), desktop->doc2dt(measure_text_pos) - (normal * dimension_offset / 2), to_item, to_phantom, CTLINE_SECONDARY, measure_repr);
        }
    }
}

}
}
}

/*
  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 :
