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-rw-r--r--src/context-fns.cpp238
1 files changed, 238 insertions, 0 deletions
diff --git a/src/context-fns.cpp b/src/context-fns.cpp
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+// SPDX-License-Identifier: GPL-2.0-or-later
+/** @file
+ * TODO: insert short description here
+ *//*
+ * Authors: see git history
+ *
+ * Copyright (C) 2018 Authors
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+#include <glibmm/i18n.h>
+
+#include "context-fns.h"
+
+#include "desktop.h"
+#include "layer-manager.h"
+#include "message-context.h"
+#include "message-stack.h"
+#include "snap.h"
+
+#include "display/control/snap-indicator.h"
+
+#include "object/sp-namedview.h"
+#include "object/sp-item-group.h"
+
+#include "ui/modifiers.h"
+#include "ui/tools/tool-base.h"
+
+static const double midpt_1_goldenratio = (1 + goldenratio) / 2;
+static const double midpt_goldenratio_2 = (goldenratio + 2) / 2;
+
+/* FIXME: could probably use a template here */
+
+/**
+ * Check to see if the current layer is both unhidden and unlocked. If not,
+ * set a message about it on the given context.
+ *
+ * \param desktop Desktop.
+ * \param message Message context to put messages on.
+ * \return true if the current layer is both unhidden and unlocked, otherwise false.
+ */
+
+bool Inkscape::have_viable_layer(SPDesktop *desktop, MessageContext *message)
+{
+ auto layer = desktop->layerManager().currentLayer();
+
+ if ( !layer || desktop->itemIsHidden(layer) ) {
+ message->flash(Inkscape::ERROR_MESSAGE,
+ _("<b>Current layer is hidden</b>. Unhide it to be able to draw on it."));
+ return false;
+ }
+
+ if ( layer->isLocked() ) {
+ message->flash(Inkscape::ERROR_MESSAGE,
+ _("<b>Current layer is locked</b>. Unlock it to be able to draw on it."));
+ return false;
+ }
+
+ return true;
+}
+
+
+/**
+ * Check to see if the current layer is both unhidden and unlocked. If not,
+ * set a message about it on the given context.
+ *
+ * \param desktop Desktop.
+ * \param message Message context to put messages on.
+ * \return true if the current layer is both unhidden and unlocked, otherwise false.
+ */
+
+bool Inkscape::have_viable_layer(SPDesktop *desktop, MessageStack *message)
+{
+ auto layer = desktop->layerManager().currentLayer();
+
+ if ( !layer || desktop->itemIsHidden(layer) ) {
+ message->flash(Inkscape::WARNING_MESSAGE,
+ _("<b>Current layer is hidden</b>. Unhide it to be able to draw on it."));
+ return false;
+ }
+
+ if ( layer->isLocked() ) {
+ message->flash(Inkscape::WARNING_MESSAGE,
+ _("<b>Current layer is locked</b>. Unlock it to be able to draw on it."));
+ return false;
+ }
+
+ return true;
+}
+
+
+Geom::Rect Inkscape::snap_rectangular_box(SPDesktop const *desktop, SPItem *item,
+ Geom::Point const &pt, Geom::Point const &center, int state)
+{
+ desktop->snapindicator->remove_snaptarget();
+ Geom::Point p[2];
+
+ auto confine = Modifiers::Modifier::get(Modifiers::Type::TRANS_CONFINE)->active(state);
+ auto off_center = Modifiers::Modifier::get(Modifiers::Type::TRANS_OFF_CENTER)->active(state);
+
+ SnapManager &m = desktop->namedview->snap_manager;
+ m.setup(desktop, false, item);
+ Inkscape::SnappedPoint snappoint;
+
+ if (confine) {
+ /* 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 (off_center) {
+
+ // 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::SnapCandidatePoint(p[0], Inkscape::SNAPSOURCE_NODE_HANDLE),
+ Inkscape::Snapper::SnapConstraint(p[0] - p[1]));
+
+ /* Try to snap p[1] (the dragged corner) along the constraint vector */
+ s[1] = m.constrainedSnap(Inkscape::SnapCandidatePoint(p[1], Inkscape::SNAPSOURCE_NODE_HANDLE),
+ Inkscape::Snapper::SnapConstraint(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::SnapCandidatePoint(p[1], Inkscape::SNAPSOURCE_NODE_HANDLE),
+ Inkscape::Snapper::SnapConstraint(p[1] - p[0]));
+ if (snappoint.getSnapped()) {
+ p[1] = snappoint.getPoint();
+ }
+ }
+
+ } else if (off_center) {
+ // 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::SnapCandidatePoint(p[0], Inkscape::SNAPSOURCE_NODE_HANDLE));
+ s[1] = m.freeSnap(Inkscape::SnapCandidatePoint(p[1], Inkscape::SNAPSOURCE_NODE_HANDLE));
+
+ 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::SnapCandidatePoint(pt, Inkscape::SNAPSOURCE_NODE_HANDLE));
+ if (snappoint.getSnapped()) {
+ p[1] = snappoint.getPoint();
+ }
+ }
+
+ if (snappoint.getSnapped()) {
+ desktop->snapindicator->set_new_snaptarget(snappoint);
+ }
+
+ p[0] *= desktop->dt2doc();
+ p[1] *= desktop->dt2doc();
+
+ m.unSetup();
+
+ 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])));
+}
+
+
+
+/*
+ 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:fileencoding=utf-8:textwidth=99 :
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