Geom::Rect Inkscape::snap_rectangular_box(SPDesktop const *desktop, SPItem *item,
Geom::Point const &pt, Geom::Point const ¢er, int state)
{
Geom::Point p[2];
bool const shift = state & GDK_SHIFT_MASK;
bool const control = state & GDK_CONTROL_MASK;
SnapManager &m = desktop->namedview->snap_manager;
m.setup(desktop, false, item);
Inkscape::SnappedPoint snappoint;
if (control) {
/* Control is down: we are constrained to producing integer-ratio rectangles */
/* Vector from the centre of the box to the point we are dragging to */
Geom::Point delta = pt - center;
/* Round it so that we have an integer-ratio (or golden ratio) box */
if (fabs(delta[Geom::X]) > fabs(delta[Geom::Y]) && (delta[Geom::Y] != 0.0)) {
double ratio = delta[Geom::X] / delta[Geom::Y];
double ratioabs = fabs (ratio);
double sign = (ratio < 0 ? -1 : 1);
if (midpt_1_goldenratio < ratioabs && ratioabs < midpt_goldenratio_2) {
delta[Geom::X] = sign * goldenratio * delta[Geom::Y];
} else {
delta[Geom::X] = floor(ratio + 0.5) * delta[Geom::Y];
}
} else if (delta[Geom::X] != 0.0) {
double ratio = delta[Geom::Y] / delta[Geom::X];
double ratioabs = fabs (ratio);
double sign = (ratio < 0 ? -1 : 1);
if (midpt_1_goldenratio < ratioabs && ratioabs < midpt_goldenratio_2) {
delta[Geom::Y] = sign * goldenratio * delta[Geom::X];
} else {
delta[Geom::Y] = floor(delta[Geom::Y] / delta[Geom::X] + 0.5) * delta[Geom::X];
}
}
/* p[1] is the dragged point with the integer-ratio constraint */
p[1] = center + delta;
if (shift) {
/* Shift is down, so our origin is the centre point rather than the corner
** point; this means that corner-point movements are bound to each other.
*/
/* p[0] is the opposite corner of our box */
p[0] = center - delta;
Inkscape::SnappedPoint s[2];
/* Try to snap p[0] (the opposite corner) along the constraint vector */
s[0] = m.constrainedSnap(Inkscape::SnapPreferences::SNAPPOINT_NODE, to_2geom(p[0]),
Inkscape::Snapper::ConstraintLine(p[0] - p[1]));
/* Try to snap p[1] (the dragged corner) along the constraint vector */
s[1] = m.constrainedSnap(Inkscape::SnapPreferences::SNAPPOINT_NODE, to_2geom(p[1]),
Inkscape::Snapper::ConstraintLine(p[1] - p[0]));
/* Choose the best snap and update points accordingly */
if (s[0].getSnapDistance() < s[1].getSnapDistance()) {
if (s[0].getSnapped()) {
p[0] = s[0].getPoint();
p[1] = 2 * center - s[0].getPoint();
snappoint = s[0];
}
} else {
if (s[1].getSnapped()) {
p[0] = 2 * center - s[1].getPoint();
p[1] = s[1].getPoint();
snappoint = s[1];
}
}
} else {
/* Our origin is the opposite corner. Snap the drag point along the constraint vector */
p[0] = center;
snappoint = m.constrainedSnap(Inkscape::SnapPreferences::SNAPPOINT_NODE, to_2geom(p[1]),
Inkscape::Snapper::ConstraintLine(p[1] - p[0]));
if (snappoint.getSnapped()) {
p[1] = snappoint.getPoint();
}
}
} else if (shift) {
/* Shift is down, so our origin is the centre point rather than the corner point;
** this means that corner-point movements are bound to each other.
*/
p[1] = pt;
p[0] = 2 * center - p[1];
Inkscape::SnappedPoint s[2];
s[0] = m.freeSnap(Inkscape::SnapPreferences::SNAPPOINT_NODE, to_2geom(p[0]));
s[1] = m.freeSnap(Inkscape::SnapPreferences::SNAPPOINT_NODE, to_2geom(p[1]));
if (s[0].getSnapDistance() < s[1].getSnapDistance()) {
if (s[0].getSnapped()) {
p[0] = s[0].getPoint();
p[1] = 2 * center - s[0].getPoint();
snappoint = s[0];
}
} else {
if (s[1].getSnapped()) {
p[0] = 2 * center - s[1].getPoint();
p[1] = s[1].getPoint();
snappoint = s[1];
}
}
} else {
/* There's no constraint on the corner point, so just snap it to anything */
p[0] = center;
p[1] = pt;
snappoint = m.freeSnap(Inkscape::SnapPreferences::SNAPPOINT_NODE, to_2geom(pt));
if (snappoint.getSnapped()) {
p[1] = snappoint.getPoint();
}
}
if (snappoint.getSnapped()) {
desktop->snapindicator->set_new_snaptarget(snappoint);
}
p[0] = sp_desktop_dt2doc_xy_point(desktop, p[0]);
p[1] = sp_desktop_dt2doc_xy_point(desktop, p[1]);
return Geom::Rect(Geom::Point(MIN(p[0][Geom::X], p[1][Geom::X]), MIN(p[0][Geom::Y], p[1][Geom::Y])),
Geom::Point(MAX(p[0][Geom::X], p[1][Geom::X]), MAX(p[0][Geom::Y], p[1][Geom::Y])));
}
static void
sp_spiral_drag(SPSpiralContext *sc, Geom::Point p, guint state)
{
SPDesktop *desktop = SP_EVENT_CONTEXT(sc)->desktop;
Inkscape::Preferences *prefs = Inkscape::Preferences::get();
int const snaps = prefs->getInt("/options/rotationsnapsperpi/value", 12);
if (!sc->item) {
if (Inkscape::have_viable_layer(desktop, sc->_message_context) == false) {
return;
}
/* Create object */
Inkscape::XML::Document *xml_doc = sp_document_repr_doc(SP_EVENT_CONTEXT_DOCUMENT(sc));
Inkscape::XML::Node *repr = xml_doc->createElement("svg:path");
repr->setAttribute("sodipodi:type", "spiral");
/* Set style */
sp_desktop_apply_style_tool(desktop, repr, "/tools/shapes/spiral", false);
sc->item = (SPItem *) desktop->currentLayer()->appendChildRepr(repr);
Inkscape::GC::release(repr);
sc->item->transform = sp_item_i2doc_affine(SP_ITEM(desktop->currentLayer())).inverse();
sc->item->updateRepr();
sp_canvas_force_full_redraw_after_interruptions(desktop->canvas, 5);
}
SnapManager &m = desktop->namedview->snap_manager;
m.setup(desktop, true, sc->item);
Geom::Point pt2g = to_2geom(p);
m.freeSnapReturnByRef(Inkscape::SnapPreferences::SNAPPOINT_NODE, pt2g);
Geom::Point const p0 = to_2geom(sp_desktop_dt2doc_xy_point(desktop, sc->center));
Geom::Point const p1 = to_2geom(sp_desktop_dt2doc_xy_point(desktop, from_2geom(pt2g)));
SPSpiral *spiral = SP_SPIRAL(sc->item);
Geom::Point const delta = p1 - p0;
gdouble const rad = Geom::L2(delta);
gdouble arg = Geom::atan2(delta) - 2.0*M_PI*spiral->revo;
if (state & GDK_CONTROL_MASK) {
arg = sp_round(arg, M_PI/snaps);
}
/* Fixme: these parameters should be got from dialog box */
sp_spiral_position_set(spiral, p0[Geom::X], p0[Geom::Y],
/*expansion*/ sc->exp,
/*revolution*/ sc->revo,
rad, arg,
/*t0*/ sc->t0);
/* status text */
GString *rads = SP_PX_TO_METRIC_STRING(rad, desktop->namedview->getDefaultMetric());
sc->_message_context->setF(Inkscape::IMMEDIATE_MESSAGE,
_("<b>Spiral</b>: radius %s, angle %5g°; with <b>Ctrl</b> to snap angle"),
rads->str, sp_round((arg + 2.0*M_PI*spiral->revo)*180/M_PI, 0.0001));
g_string_free(rads, FALSE);
}
