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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 16:29:01 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 16:29:01 +0000 |
commit | 35a96bde514a8897f6f0fcc41c5833bf63df2e2a (patch) | |
tree | 657d15a03cc46bd099fc2c6546a7a4ad43815d9f /src/context-fns.cpp | |
parent | Initial commit. (diff) | |
download | inkscape-35a96bde514a8897f6f0fcc41c5833bf63df2e2a.tar.xz inkscape-35a96bde514a8897f6f0fcc41c5833bf63df2e2a.zip |
Adding upstream version 1.0.2.upstream/1.0.2upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/context-fns.cpp')
-rw-r--r-- | src/context-fns.cpp | 250 |
1 files changed, 250 insertions, 0 deletions
diff --git a/src/context-fns.cpp b/src/context-fns.cpp new file mode 100644 index 0000000..5e9711f --- /dev/null +++ b/src/context-fns.cpp @@ -0,0 +1,250 @@ +// 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 "message-context.h" +#include "message-stack.h" +#include "snap.h" + +#include "display/snap-indicator.h" + +#include "object/sp-namedview.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) +{ + SPItem const *layer = SP_ITEM(desktop->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 || 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) +{ + SPItem const *layer = SP_ITEM(desktop->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 || 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 ¢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::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 (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::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]))); +} + + + +Geom::Point Inkscape::setup_for_drag_start(SPDesktop *desktop, Inkscape::UI::Tools::ToolBase* ec, GdkEvent *ev) +{ + ec->xp = static_cast<gint>(ev->button.x); + ec->yp = static_cast<gint>(ev->button.y); + ec->within_tolerance = true; + + Geom::Point const p(ev->button.x, ev->button.y); + ec->item_to_select = Inkscape::UI::Tools::sp_event_context_find_item(desktop, p, ev->button.state & GDK_MOD1_MASK, TRUE); + return ec->desktop->w2d(p); +} + + +/* + 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 : |