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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:24:48 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:24:48 +0000 |
commit | cca66b9ec4e494c1d919bff0f71a820d8afab1fa (patch) | |
tree | 146f39ded1c938019e1ed42d30923c2ac9e86789 /src/display/control/canvas-item-bpath.cpp | |
parent | Initial commit. (diff) | |
download | inkscape-cca66b9ec4e494c1d919bff0f71a820d8afab1fa.tar.xz inkscape-cca66b9ec4e494c1d919bff0f71a820d8afab1fa.zip |
Adding upstream version 1.2.2.upstream/1.2.2upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | src/display/control/canvas-item-bpath.cpp | 262 |
1 files changed, 262 insertions, 0 deletions
diff --git a/src/display/control/canvas-item-bpath.cpp b/src/display/control/canvas-item-bpath.cpp new file mode 100644 index 0000000..6938ac5 --- /dev/null +++ b/src/display/control/canvas-item-bpath.cpp @@ -0,0 +1,262 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/** + * A class to represent a Bezier path. + */ + +/* + * Author: + * Tavmjong Bah + * + * Copyright (C) 2020 Tavmjong Bah + * + * Rewrite of SPCanvasBPath + * + * Released under GNU GPL v2+, read the file 'COPYING' for more information. + */ + +#include "canvas-item-bpath.h" + +#include <memory> // unique_ptr +#include <utility> // std::move + +#include "color.h" // SP_RGBA_x_F + +#include "display/curve.h" +#include "display/cairo-utils.h" + +#include "helper/geom.h" // bounds_exact_transformed() + +#include "ui/widget/canvas.h" + +namespace Inkscape { + +/** + * Create an null control bpath. + */ +CanvasItemBpath::CanvasItemBpath(CanvasItemGroup *group) + : CanvasItem(group) +{ + _name = "CanvasItemBpath:Null"; + _pickable = true; // For now, nobody gets events from this class! +} + +/** + * Create a control bpath. Curve is in document coordinates. + */ +CanvasItemBpath::CanvasItemBpath(CanvasItemGroup *group, SPCurve *curve, bool phantom_line) + : CanvasItem(group) + , _phantom_line(phantom_line) +{ + _name = "CanvasItemBpath"; + _pickable = true; // For now, everyone gets events from this class! + if (curve) { + _path = curve->get_pathvector(); + } + + request_update(); // Render immediately or temporary bpaths won't show. +} + +/** + * Create a control bpath. Path is in document coordinates. + */ +CanvasItemBpath::CanvasItemBpath(CanvasItemGroup *group, Geom::PathVector path, bool phantom_line) + : CanvasItem(group) + , _path(std::move(path)) + , _phantom_line(phantom_line) +{ + _name = "CanvasItemBpath"; + _pickable = true; // For now, everyone gets events from this class! + request_update(); // Render immediately or temporary bpaths won't show. +} + +/** + * Set a control bpath. Curve is in document coordinates. + */ +void CanvasItemBpath::set_bpath(SPCurve *curve, bool phantom_line) +{ + if (curve) { // No test to see if *curve == *_curve so we always do the swap. + _path = curve->get_pathvector(); + } else { + _path.clear(); + } + + _phantom_line = phantom_line; + + request_update(); +} + +/** + * Set a control bpath. Path is in document coordinates. + */ +void CanvasItemBpath::set_bpath(Geom::PathVector const &path, bool phantom_line) +{ + _path = path; + _phantom_line = phantom_line; + + request_update(); +} + +/** + * Set the fill color and fill rule. + */ +void CanvasItemBpath::set_fill(guint rgba, SPWindRule fill_rule) +{ + if (_fill != rgba || _fill_rule != fill_rule) { + _fill = rgba; + _fill_rule = fill_rule; + request_redraw(); + } +} + +/** + * Returns distance between point in canvas units and nearest point on bpath. + */ +double CanvasItemBpath::closest_distance_to(Geom::Point const &p) +{ + double d = Geom::infinity(); + + // Convert p to document coordinates (quicker than converting path to canvas units). + Geom::Point p_doc = p * _affine.inverse(); + _path.nearestTime(p_doc, &d); + d *= _affine.descrim(); // Uniform scaling and rotation only. + + return d; +} + +/** + * Returns true if point p (in canvas units) is within tolerance (canvas units) distance of bpath. + */ +bool CanvasItemBpath::contains(Geom::Point const &p, double tolerance) +{ + if (tolerance == 0) { + tolerance = 1; // Need a minimum tolerance value or always returns false. + } + + return closest_distance_to(p) < tolerance; +} + +/** + * Update and redraw control bpath. + */ +void CanvasItemBpath::update(Geom::Affine const &affine) +{ + if (_affine == affine && !_need_update) { + // Nothing to do. + return; + } + + // Queue redraw of old area (erase previous content). + request_redraw(); + + // Get new bounds + _affine = affine; + + _bounds = Geom::Rect(); // Reset bounds + + if (_path.empty()) return; // No path, no chocolate! + + Geom::OptRect bbox = bounds_exact_transformed(_path, _affine); + + if (bbox) { + _bounds = *bbox; + _bounds.expandBy(2); + } else { + _bounds = Geom::Rect(); + } + + // Queue redraw of new area + request_redraw(); + + _need_update = false; +} + +/** + * Render bpath to screen via Cairo. + */ +void CanvasItemBpath::render(Inkscape::CanvasItemBuffer *buf) +{ + if (!buf) { + std::cerr << "CanvasItemBpath::Render: No buffer!" << std::endl; + return; + } + + if (!_visible) { + // Hidden + return; + } + + if (_path.empty()) { + return; + } + + bool do_fill = (_fill & 0xff) != 0; // Not invisible. + bool do_stroke = (_stroke & 0xff) != 0; // Not invisible. + + if (!do_fill && !do_stroke) { + // Both fill and stroke invisible. + return; + } + + buf->cr->save(); + + // Setup path + buf->cr->set_tolerance(0.5); + buf->cr->begin_new_path(); + + feed_pathvector_to_cairo (buf->cr->cobj(), _path, _affine, buf->rect, + /* optimized_stroke = */ !do_fill, 1); + + // Do fill + if (do_fill) { + buf->cr->set_source_rgba(SP_RGBA32_R_F(_fill), SP_RGBA32_G_F(_fill), + SP_RGBA32_B_F(_fill), SP_RGBA32_A_F(_fill)); + buf->cr->set_fill_rule(_fill_rule == SP_WIND_RULE_EVENODD ? + Cairo::FILL_RULE_EVEN_ODD : Cairo::FILL_RULE_WINDING); + buf->cr->fill_preserve(); + } + + // Do stroke + if (do_stroke) { + + if (!_dashes.empty()) { + buf->cr->set_dash(_dashes, 0.0); // 0.0 is offset + } + + if (_phantom_line) { + buf->cr->set_source_rgba(1.0, 1.0, 1.0, 0.25); + buf->cr->set_line_width(2.0); + buf->cr->stroke_preserve(); + } + + buf->cr->set_source_rgba(SP_RGBA32_R_F(_stroke), SP_RGBA32_G_F(_stroke), + SP_RGBA32_B_F(_stroke), SP_RGBA32_A_F(_stroke)); + buf->cr->set_line_width(1.0); + buf->cr->stroke(); + + } else { + buf->cr->begin_new_path(); // Clears path + } + + // Uncomment to show bounds + // Geom::Rect bounds = _bounds; + // bounds.expandBy(-1); + // bounds -= buf->rect.min(); + // buf->cr->set_source_rgba(1.0, 0.0, 0.0, 1.0); + // buf->cr->rectangle(bounds.min().x(), bounds.min().y(), bounds.width(), bounds.height()); + // buf->cr->stroke(); + + buf->cr->restore(); +} + +} // namespace Inkscape + +/* + 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 : |