#include <gdk/gdkkeysyms.h>

#include "helper/units.h"

#include "macros.h"

#include "display/curve.h"

#include "sp-shape.h"

#include "sp-text.h"

#include "sp-flowtext.h"

#include "text-editing.h"

#include "display/sp-ctrlline.h"

#include "display/sodipodi-ctrl.h"

#include "display/sp-canvas-item.h"

#include "display/sp-canvas-util.h"

#include "desktop.h"

#include "document.h"

#include "pixmaps/cursor-measure.xpm"

#include "preferences.h"

#include "inkscape.h"

#include "desktop-handles.h"

#include "measure-context.h"

#include "draw-context.h"

#include "display/canvas-text.h"

#include "path-chemistry.h"

#include "2geom/line.h"

#include <2geom/path-intersection.h>

#include <2geom/pathvector.h>

#include <2geom/crossing.h>

static void sp_measure_context_class_init(SPMeasureContextClass *klass);

static void sp_measure_context_init(SPMeasureContext *measure_context);

static void sp_measure_context_setup(SPEventContext *ec);

static void sp_measure_context_finish (SPEventContext *ec);

static gint sp_measure_context_root_handler(SPEventContext *event_context, GdkEvent *event);

static gint sp_measure_context_item_handler(SPEventContext *event_context, SPItem *item, GdkEvent *event);

static SPEventContextClass *parent_class;

static gint xp = 0, yp = 0; // where drag started

static gint tolerance = 0;

static bool within_tolerance = false;

Geom::Point start_point;

std::vector<Inkscape::Display::TemporaryItem*> measure_tmp_items;

GType sp_measure_context_get_type(void)

{

static GType type = 0;

if (!type) {

GTypeInfo info = {

sizeof(SPMeasureContextClass),

NULL, NULL,

(GClassInitFunc) sp_measure_context_class_init,

NULL, NULL,

sizeof(SPMeasureContext),

4,

(GInstanceInitFunc) sp_measure_context_init,

NULL, /* value_table */

};

type = g_type_register_static(SP_TYPE_EVENT_CONTEXT, "SPMeasureContext", &info, (GTypeFlags) 0);

}

return type;

}

static void sp_measure_context_class_init(SPMeasureContextClass *klass)

{

SPEventContextClass *event_context_class = (SPEventContextClass *) klass;

parent_class = (SPEventContextClass*) g_type_class_peek_parent(klass);

event_context_class->setup = sp_measure_context_setup;

event_context_class->finish = sp_measure_context_finish;

event_context_class->root_handler = sp_measure_context_root_handler;

event_context_class->item_handler = sp_measure_context_item_handler;

}

static void sp_measure_context_init (SPMeasureContext *measure_context)

{

SPEventContext *event_context = SP_EVENT_CONTEXT(measure_context);

event_context->cursor_shape = cursor_measure_xpm;

event_context->hot_x = 4;

event_context->hot_y = 4;

}

static void

sp_measure_context_finish (SPEventContext *ec)

{

SPMeasureContext *mc = SP_MEASURE_CONTEXT(ec);

ec->enableGrDrag(false);

if (mc->grabbed) {

sp_canvas_item_ungrab(mc->grabbed, GDK_CURRENT_TIME);

mc->grabbed = NULL;

}

}

static void sp_measure_context_setup(SPEventContext *ec)

{

if (((SPEventContextClass *) parent_class)->setup) {

((SPEventContextClass *) parent_class)->setup(ec);

}

}

static gint sp_measure_context_item_handler(SPEventContext *event_context, SPItem *item, GdkEvent *event)

{

gint ret = FALSE;

if (((SPEventContextClass *) parent_class)->item_handler) {

ret = ((SPEventContextClass *) parent_class)->item_handler (event_context, item, event);

}

return ret;

}

bool GeomPointSortPredicate(const Geom::Point& p1, const Geom::Point& p2)

{

if (p1[Geom::Y] == p2[Geom::Y])

return p1[Geom::X] < p2[Geom::X];

else

return p1[Geom::Y] < p2[Geom::Y];

}

void calculate_intersections(SPDesktop *desktop, SPItem* item, Geom::PathVector *lineseg, SPCurve *curve, std::vector<Geom::Point> *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());

// Reconstruct and store the points of intersection

for (Geom::Crossings::const_iterator m = cs[0].begin(); m != cs[0].end(); m++) {

#if 0

Geom::Point intersection = (*lineseg)[0].pointAt((*m).ta);

double eps = 0.0001;

SPDocument* doc = sp_desktop_document(desktop);

if (((*m).ta > eps &&

item == doc->getItemAtPoint(desktop->dkey, (*lineseg)[0].pointAt((*m).ta - eps), false, NULL)) ||

((*m).ta + eps < 1 &&

item == doc->getItemAtPoint(desktop->dkey, (*lineseg)[0].pointAt((*m).ta + eps), false, NULL)) ){

intersections->push_back(intersection);

}

#else

intersections->push_back((*lineseg)[0].pointAt((*m).ta));

#endif

}

}

static gint sp_measure_context_root_handler(SPEventContext *event_context, GdkEvent *event)

{

SPDesktop *desktop = event_context->desktop;

Inkscape::Preferences *prefs = Inkscape::Preferences::get();

tolerance = prefs->getIntLimited("/options/dragtolerance/value", 0, 0, 100);

SPMeasureContext *mc = SP_MEASURE_CONTEXT(event_context);

gint ret = FALSE;

switch (event->type) {

case GDK_BUTTON_PRESS:

{

Geom::Point const button_w(event->button.x, event->button.y);

start_point = desktop->w2d(button_w);

if (event->button.button == 1 && !event_context->space_panning) {

// save drag origin

xp = (gint) event->button.x;

yp = (gint) event->button.y;

within_tolerance = true;

ret = TRUE;

}

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);

mc->grabbed = SP_CANVAS_ITEM(desktop->acetate);

break;

}

case GDK_MOTION_NOTIFY:

{

if (event->motion.state & GDK_BUTTON1_MASK && !event_context->space_panning) {

ret = TRUE;

if ( within_tolerance

&& ( abs( (gint) event->motion.x - xp ) < tolerance )

&& ( abs( (gint) event->motion.y - yp ) < tolerance ) ) {

break; // 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;

//clear previous temporary canvas items, we'll draw new ones

unsigned int idx;

for (idx=0; idx<measure_tmp_items.size(); idx++){

desktop->remove_temporary_canvasitem(measure_tmp_items[idx]);

}

measure_tmp_items.clear();

Geom::Point const motion_w(event->motion.x, event->motion.y);

Geom::Point const motion_dt(desktop->w2d(motion_w));

Geom::Point end_point = motion_dt;

//rotation constraint

if (event->motion.state & GDK_CONTROL_MASK)

spdc_endpoint_snap_rotation(event_context, end_point, start_point, event->motion.state);

//draw control line

SPCanvasItem * control_line = NULL;

control_line = sp_canvas_item_new(sp_desktop_tempgroup (desktop), SP_TYPE_CTRLLINE, NULL);

sp_ctrlline_set_coords(SP_CTRLLINE(control_line), start_point, end_point);

measure_tmp_items.push_back(desktop->add_temporary_canvasitem(control_line, 0));

Geom::PathVector lineseg;

Geom::Path p;

p.start(desktop->dt2doc(start_point));

p.appendNew<Geom::LineSegment>(desktop->dt2doc(end_point));

lineseg.push_back(p);

double deltax = end_point[Geom::X] - start_point[Geom::X];

double deltay = end_point[Geom::Y] - start_point[Geom::Y];

double angle = atan2(deltay, deltax);

#define NPOINTS 800

std::vector<Geom::Point> points;

double i;

for (i=0; i<NPOINTS; i++){

points.push_back(desktop->d2w(start_point + (i/NPOINTS)*(end_point-start_point)));

}

//select elements crossed by line segment:

GSList *items = sp_desktop_document(desktop)->getItemsAtPoints(desktop->dkey, points);

SPItem* item;

GSList *l;

std::vector<Geom::Point> intersections;

Inkscape::Preferences *prefs = Inkscape::Preferences::get();

bool ignore_1st_and_last = prefs->getBool("/tools/measure/ignore_1st_and_last", true);

if (!ignore_1st_and_last){

intersections.push_back(desktop->dt2doc(start_point));

}

for (l = items; l != NULL; l = l->next){

item = (SPItem*) (l->data);

if (SP_IS_SHAPE(item)) {

calculate_intersections(desktop, item, &lineseg, SP_SHAPE(item)->getCurve(), &intersections);

} 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->i2doc_affine());

Geom::PathVector pathv = curve->get_pathvector();

calculate_intersections(desktop, item, &lineseg, curve, &intersections);

if (iter == te_get_layout(item)->end())

break;

} while (true);

}

}

}

if (!ignore_1st_and_last){

intersections.push_back(desktop->dt2doc(end_point));

}

//sort intersections

if (intersections.size()>2){

std::sort(intersections.begin(), intersections.end(), GeomPointSortPredicate);

}

for (idx=0;idx<intersections.size(); idx++){

// Display the intersection indicator (i.e. the cross)

SPCanvasItem * canvasitem = NULL;

canvasitem = sp_canvas_item_new(sp_desktop_tempgroup (desktop),

SP_TYPE_CTRL,

"anchor", GTK_ANCHOR_CENTER,

"size", 8.0,

"stroked", TRUE,

"stroke_color", 0xff0000ff,

"mode", SP_KNOT_MODE_XOR,

"shape", SP_KNOT_SHAPE_CROSS,

NULL );

SP_CTRL(canvasitem)->moveto(desktop->doc2dt(intersections[idx]));

measure_tmp_items.push_back(desktop->add_temporary_canvasitem(canvasitem, 0));

}

SPUnitId unitid = static_cast<SPUnitId>(prefs->getInt("/tools/measure/unitid", SP_UNIT_PX));

SPUnit unit = sp_unit_get_by_id(unitid);

double fontsize = prefs->getInt("/tools/measure/fontsize");

Geom::Point previous_point;

if (intersections.size()>0)

previous_point = intersections[0];

for (idx=1; idx < intersections.size(); idx++){

Geom::Point measure_text_pos = (previous_point + intersections[idx])/2;

double lengthval = (intersections[idx] - previous_point).length();

sp_convert_distance(&lengthval, &sp_unit_get_by_id(SP_UNIT_PX), &unit);

char* measure_str = (char*) malloc(sizeof(char)*20);

sprintf(measure_str, "%.2f %s", lengthval, unit.abbr);

SPCanvasItem *canvas_tooltip = sp_canvastext_new(sp_desktop_tempgroup(desktop), desktop, desktop->dt2doc(measure_text_pos), measure_str);

sp_canvastext_set_fontsize (SP_CANVASTEXT(canvas_tooltip), fontsize);

SP_CANVASTEXT(canvas_tooltip)->rgba = 0xffffffff;

SP_CANVASTEXT(canvas_tooltip)->rgba_background = 0x0000007f;

SP_CANVASTEXT(canvas_tooltip)->outline = false;

SP_CANVASTEXT(canvas_tooltip)->background = true;

measure_tmp_items.push_back(desktop->add_temporary_canvasitem(canvas_tooltip, 0));

free(measure_str);

previous_point = intersections[idx];

}

char* angle_str = (char*) malloc(sizeof(char)*20);

sprintf(angle_str, "%.2f °", angle * 180/3.1415 );

SPCanvasItem *canvas_tooltip = sp_canvastext_new(sp_desktop_tempgroup(desktop), desktop, end_point + desktop->w2d(Geom::Point(5*fontsize,0)), angle_str);

sp_canvastext_set_fontsize (SP_CANVASTEXT(canvas_tooltip), fontsize);

sp_canvastext_set_rgba32 (SP_CANVASTEXT(canvas_tooltip), 0x337f33ff, 0xffffffff);

SP_CANVASTEXT(canvas_tooltip)->rgba = 0xffffffff;

SP_CANVASTEXT(canvas_tooltip)->rgba_background = 0x337f337f;

SP_CANVASTEXT(canvas_tooltip)->outline = false;

SP_CANVASTEXT(canvas_tooltip)->background = true;

measure_tmp_items.push_back(desktop->add_temporary_canvasitem(canvas_tooltip, 0));

free(angle_str);

gobble_motion_events(GDK_BUTTON1_MASK);

}

break;

}

case GDK_BUTTON_RELEASE:

{

//clear all temporary canvas items related to the measurement tool.

unsigned int idx;

for (idx=0; idx<measure_tmp_items.size(); idx++){

desktop->remove_temporary_canvasitem(measure_tmp_items[idx]);

}

measure_tmp_items.clear();

if (mc->grabbed) {

sp_canvas_item_ungrab(mc->grabbed, event->button.time);

mc->grabbed = NULL;

}

xp = yp = 0;

break;

}

default:

break;

}

if (!ret) {

if (((SPEventContextClass *) parent_class)->root_handler) {

ret = ((SPEventContextClass *) parent_class)->root_handler(event_context, event);

}

}

return ret;

}