#include "knotholder.h"

#include "sp-item.h"

#include "style.h"

#include "preferences.h"

#include "macros.h"

#include "sp-pattern.h"

#include "snap.h"

#include "desktop.h"

#include "sp-namedview.h"

#include <2geom/affine.h>

#include <2geom/transforms.h>

int KnotHolderEntity::counter = 0;

KnotHolderEntity::create(SPDesktop *desktop, SPItem *item, KnotHolder *parent, const gchar *tip,

SPKnotShapeType shape, SPKnotModeType mode, guint32 color)

{

knot = sp_knot_new(desktop, tip);

this->parent_holder = parent;

this->item = item; // TODO: remove the item either from here or from knotholder.cpp

this->desktop = desktop;

my_counter = KnotHolderEntity::counter++;

g_object_set(G_OBJECT (knot->item), "shape", shape, NULL);

g_object_set(G_OBJECT (knot->item), "mode", mode, NULL);

knot->fill [SP_KNOT_STATE_NORMAL] = color;

g_object_set (G_OBJECT (knot->item), "fill_color", color, NULL);

update_knot();

sp_knot_show(knot);

_moved_connection = knot->_moved_signal.connect(sigc::mem_fun(*parent_holder, &KnotHolder::knot_moved_handler));

_click_connection = knot->_click_signal.connect(sigc::mem_fun(*parent_holder, &KnotHolder::knot_clicked_handler));

_ungrabbed_connection = knot->_ungrabbed_signal.connect(sigc::mem_fun(*parent_holder, &KnotHolder::knot_ungrabbed_handler));

}

KnotHolderEntity::~KnotHolderEntity()

{

_moved_connection.disconnect();

_click_connection.disconnect();

_ungrabbed_connection.disconnect();

/* unref should call destroy */

if (knot) {

g_object_unref(knot);

} else {

// FIXME: This shouldn't occur. Perhaps it is caused by LPE PointParams being knotholder entities, too

// If so, it will likely be fixed with upcoming refactoring efforts.

g_return_if_fail(knot);

}

}

KnotHolderEntity::update_knot()

{

Geom::Affine const i2dt(item->i2dt_affine());

Geom::Point dp(knot_get() * i2dt);

_moved_connection.block();

sp_knot_set_position(knot, dp, SP_KNOT_STATE_NORMAL);

_moved_connection.unblock();

}

Geom::Point

KnotHolderEntity::snap_knot_position(Geom::Point const &p)

{

Geom::Affine const i2dt (item->i2dt_affine());

Geom::Point s = p * i2dt;

SnapManager &m = desktop->namedview->snap_manager;

m.setup(desktop, true, item);

m.freeSnapReturnByRef(s, Inkscape::SNAPSOURCE_NODE_HANDLE);

m.unSetup();

return s * i2dt.inverse();

}

Geom::Point

KnotHolderEntity::snap_knot_position_constrained(Geom::Point const &p, Inkscape::Snapper::SnapConstraint const &constraint)

{

Geom::Affine const i2d (item->i2dt_affine());

Geom::Point s = p * i2d;

SnapManager &m = desktop->namedview->snap_manager;

m.setup(desktop, true, item);

// constrainedSnap() will first project the point p onto the constraint line and then try to snap along that line.

// This way the constraint is already enforced, no need to worry about that later on

Inkscape::Snapper::SnapConstraint transformed_constraint = Inkscape::Snapper::SnapConstraint(constraint.getPoint() * i2d, (constraint.getPoint() + constraint.getDirection()) * i2d - constraint.getPoint() * i2d);

m.constrainedSnapReturnByRef(s, Inkscape::SNAPSOURCE_NODE_HANDLE, transformed_constraint);

m.unSetup();

return s * i2d.inverse();

}

static gdouble sp_pattern_extract_theta(SPPattern *pat)

{

Geom::Affine transf = pat->patternTransform;

return Geom::atan2(transf.xAxis());

}

static Geom::Point sp_pattern_extract_scale(SPPattern *pat)

{

Geom::Affine transf = pat->patternTransform;

return Geom::Point( transf.expansionX(), transf.expansionY() );

}

static Geom::Point sp_pattern_extract_trans(SPPattern const *pat)

{

return Geom::Point(pat->patternTransform[4], pat->patternTransform[5]);

}

PatternKnotHolderEntityXY::knot_set(Geom::Point const &p, Geom::Point const &origin, guint state)

{

SPPattern *pat = SP_PATTERN(SP_STYLE_FILL_SERVER(SP_OBJECT(item)->style));

// FIXME: this snapping should be done together with knowing whether control was pressed. If GDK_CONTROL_MASK, then constrained snapping should be used.

Geom::Point p_snapped = snap_knot_position(p);

if ( state & GDK_CONTROL_MASK ) {

if (fabs((p - origin)[Geom::X]) > fabs((p - origin)[Geom::Y])) {

p_snapped[Geom::Y] = origin[Geom::Y];

} else {

p_snapped[Geom::X] = origin[Geom::X];

}

}

if (state) {

Geom::Point const q = p_snapped - sp_pattern_extract_trans(pat);

item->adjust_pattern(Geom::Affine(Geom::Translate(q)));

}

item->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG);

}

Geom::Point

PatternKnotHolderEntityXY::knot_get()

{

SPPattern const *pat = SP_PATTERN(SP_STYLE_FILL_SERVER(SP_OBJECT(item)->style));

return sp_pattern_extract_trans(pat);

}

Geom::Point

PatternKnotHolderEntityAngle::knot_get()

{

SPPattern *pat = SP_PATTERN(SP_STYLE_FILL_SERVER(SP_OBJECT(item)->style));

gdouble x = (pattern_width(pat));

gdouble y = 0;

Geom::Point delta = Geom::Point(x,y);

Geom::Point scale = sp_pattern_extract_scale(pat);

gdouble theta = sp_pattern_extract_theta(pat);

delta = delta * Geom::Affine(Geom::Scale(scale))*Geom::Affine(Geom::Rotate(theta));

delta = delta + sp_pattern_extract_trans(pat);

return delta;

}

PatternKnotHolderEntityAngle::knot_set(Geom::Point const &p, Geom::Point const &/*origin*/, guint state)

{

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

int const snaps = prefs->getInt("/options/rotationsnapsperpi/value", 12);

SPPattern *pat = SP_PATTERN(SP_STYLE_FILL_SERVER(SP_OBJECT(item)->style));

// get the angle from pattern 0,0 to the cursor pos

Geom::Point delta = p - sp_pattern_extract_trans(pat);

gdouble theta = atan2(delta);

if ( state & GDK_CONTROL_MASK ) {

theta = sp_round(theta, M_PI/snaps);

}

// get the scale from the current transform so we can keep it.

Geom::Point scl = sp_pattern_extract_scale(pat);

Geom::Affine rot = Geom::Affine(Geom::Scale(scl)) * Geom::Affine(Geom::Rotate(theta));

Geom::Point const t = sp_pattern_extract_trans(pat);

rot[4] = t[Geom::X];

rot[5] = t[Geom::Y];

item->adjust_pattern(rot, true);

item->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG);

}

PatternKnotHolderEntityScale::knot_set(Geom::Point const &p, Geom::Point const &/*origin*/, guint state)

{

SPPattern *pat = SP_PATTERN(SP_STYLE_FILL_SERVER(SP_OBJECT(item)->style));

// FIXME: this snapping should be done together with knowing whether control was pressed. If GDK_CONTROL_MASK, then constrained snapping should be used.

Geom::Point p_snapped = snap_knot_position(p);

// get angle from current transform

gdouble theta = sp_pattern_extract_theta(pat);

// Get the new scale from the position of the knotholder

Geom::Point d = p_snapped - sp_pattern_extract_trans(pat);

gdouble pat_x = pattern_width(pat);

gdouble pat_y = pattern_height(pat);

Geom::Scale scl(1);

if ( state & GDK_CONTROL_MASK ) {

// if ctrl is pressed: use 1:1 scaling

gdouble pat_h = hypot(pat_x, pat_y);

scl = Geom::Scale(d.length() / pat_h);

} else {

d *= Geom::Rotate(-theta);

scl = Geom::Scale(d[Geom::X] / pat_x, d[Geom::Y] / pat_y);

}

Geom::Affine rot = (Geom::Affine)scl * Geom::Rotate(theta);

Geom::Point const t = sp_pattern_extract_trans(pat);

rot[4] = t[Geom::X];

rot[5] = t[Geom::Y];

item->adjust_pattern(rot, true);

item->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG);

}

Geom::Point

PatternKnotHolderEntityScale::knot_get()

{

SPPattern *pat = SP_PATTERN(SP_STYLE_FILL_SERVER(SP_OBJECT(item)->style));

gdouble x = pattern_width(pat);

gdouble y = pattern_height(pat);

Geom::Point delta = Geom::Point(x,y);

Geom::Affine a = pat->patternTransform;

a[4] = 0;

a[5] = 0;

delta = delta * a;

delta = delta + sp_pattern_extract_trans(pat);

return delta;

}