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// 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 "color.h" // SP_RGBA_x_F
#include "display/curve.h"
#include "display/cairo-utils.h"
#include "helper/geom.h" // bounds_exact_transformed()
namespace Inkscape {
/**
* Create a null control bpath.
*/
CanvasItemBpath::CanvasItemBpath(CanvasItemGroup *group)
: CanvasItem(group)
{
_name = "CanvasItemBpath:Null";
_pickable = true; // For now, everyone gets events from this class!
}
/**
* 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 const *curve, bool phantom_line)
{
set_bpath(curve ? curve->get_pathvector() : Geom::PathVector(), phantom_line);
}
/**
* Set a control bpath. Path is in document coordinates.
*/
void CanvasItemBpath::set_bpath(Geom::PathVector path, bool phantom_line)
{
defer([=, path = std::move(path)] () mutable {
_path = std::move(path);
_phantom_line = phantom_line;
request_update();
});
}
/**
* Set the fill color and fill rule.
*/
void CanvasItemBpath::set_fill(uint32_t fill, SPWindRule fill_rule)
{
defer([=] {
if (_fill == fill && _fill_rule == fill_rule) return;
_fill = fill;
_fill_rule = fill_rule;
request_redraw();
});
}
void CanvasItemBpath::set_dashes(std::vector<double> &&dashes)
{
defer([=, dashes = std::move(dashes)] () mutable {
_dashes = std::move(dashes);
});
}
/**
* Set the stroke width
*/
void CanvasItemBpath::set_stroke_width(double width)
{
defer([=] {
if (_stroke_width == width) return;
_stroke_width = width;
request_redraw();
});
}
/**
* Returns distance between point in canvas units and nearest point on bpath.
*/
double CanvasItemBpath::closest_distance_to(Geom::Point const &p) const
{
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.
}
// Check for 'inside' a filled bpath if a fill is being used.
if ((_fill & 0xff) != 0) {
Geom::Point p_doc = p * affine().inverse();
if (_path.winding(p_doc) % 2 != 0) {
return true;
}
}
// Otherwise see how close we are to the outside line.
return closest_distance_to(p) < tolerance;
}
/**
* Update and redraw control bpath.
*/
void CanvasItemBpath::_update(bool)
{
// Queue redraw of old area (erase previous content).
request_redraw();
if (_path.empty()) {
_bounds = {};
return;
}
_bounds = expandedBy(bounds_exact_transformed(_path, affine()), 2);
// Queue redraw of new area
request_redraw();
}
/**
* Render bpath to screen via Cairo.
*/
void CanvasItemBpath::_render(Inkscape::CanvasItemBuffer &buf) const
{
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,
/* optimize_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(_stroke_width);
buf.cr->stroke();
} else {
buf.cr->begin_new_path(); // Clears path
}
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 :
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