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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Simple bezier curve used for Mesh Gradients
*
* Author:
* Tavmjong Bah <tavmjong@free.fr>
*
* Copyright (C) 2011 Tavmjong Bah
* Copyright (C) 2007 Johan Engelen
* Copyright (C) 1999-2002 Lauris Kaplinski
*
* Released under GNU GPL v2+, read the file 'COPYING' for more information.
*/
#include "display/sp-ctrlcurve.h"
#include "display/sp-canvas-util.h"
#include "display/cairo-utils.h"
#include "color.h"
#include "display/sp-canvas.h"
namespace {
static void sp_ctrlcurve_destroy(SPCanvasItem *object);
static void sp_ctrlcurve_update(SPCanvasItem *item, Geom::Affine const &affine, unsigned int flags);
static void sp_ctrlcurve_render(SPCanvasItem *item, SPCanvasBuf *buf);
} // namespace
G_DEFINE_TYPE(SPCtrlCurve, sp_ctrlcurve, SP_TYPE_CANVAS_ITEM);
static void
sp_ctrlcurve_class_init(SPCtrlCurveClass *klass)
{
klass->destroy = sp_ctrlcurve_destroy;
klass->update = sp_ctrlcurve_update;
klass->render = sp_ctrlcurve_render;
}
static void
sp_ctrlcurve_init(SPCtrlCurve *ctrlcurve)
{
// Points are initialized to 0,0
ctrlcurve->rgba = 0x0000ff7f;
ctrlcurve->item=nullptr;
ctrlcurve->corner0 = -1;
ctrlcurve->corner1 = -1;
}
namespace {
static void
sp_ctrlcurve_destroy(SPCanvasItem *object)
{
g_return_if_fail (object != nullptr);
g_return_if_fail (SP_IS_CTRLCURVE (object));
SPCtrlCurve *ctrlcurve = SP_CTRLCURVE (object);
ctrlcurve->item=nullptr;
if (SP_CANVAS_ITEM_CLASS(sp_ctrlcurve_parent_class)->destroy)
SP_CANVAS_ITEM_CLASS(sp_ctrlcurve_parent_class)->destroy(object);
}
static void
sp_ctrlcurve_render(SPCanvasItem *item, SPCanvasBuf *buf)
{
SPCtrlCurve *cl = SP_CTRLCURVE (item);
if (!buf->ct)
return;
if ( cl->p0 == cl->p1 &&
cl->p1 == cl->p2 &&
cl->p2 == cl->p3 )
return;
ink_cairo_set_source_rgba32(buf->ct, cl->rgba);
cairo_set_line_width(buf->ct, 1);
cairo_new_path(buf->ct);
Geom::Point p0 = cl->p0 * cl->affine;
Geom::Point p1 = cl->p1 * cl->affine;
Geom::Point p2 = cl->p2 * cl->affine;
Geom::Point p3 = cl->p3 * cl->affine;
cairo_move_to (buf->ct, p0[Geom::X] - buf->rect.left(), p0[Geom::Y] - buf->rect.top());
cairo_curve_to (buf->ct,
p1[Geom::X] - buf->rect.left(), p1[Geom::Y] - buf->rect.top(),
p2[Geom::X] - buf->rect.left(), p2[Geom::Y] - buf->rect.top(),
p3[Geom::X] - buf->rect.left(), p3[Geom::Y] - buf->rect.top() );
cairo_stroke(buf->ct);
}
static void
sp_ctrlcurve_update(SPCanvasItem *item, Geom::Affine const &affine, unsigned int flags)
{
SPCtrlCurve *cl = SP_CTRLCURVE (item);
item->canvas->requestRedraw(item->x1, item->y1, item->x2, item->y2);
if (SP_CANVAS_ITEM_CLASS(sp_ctrlcurve_parent_class)->update)
SP_CANVAS_ITEM_CLASS(sp_ctrlcurve_parent_class)->update(item, affine, flags);
sp_canvas_item_reset_bounds (item);
cl->affine = affine;
if (cl->p0 == cl->p1 && cl->p1 == cl->p2 && cl->p2 == cl->p3 ) {
item->x1 = item->x2 = item->y1 = item->y2 = 0;
} else {
Geom::Point p0 = cl->p0 * affine;
Geom::Point p1 = cl->p1 * affine;
Geom::Point p2 = cl->p2 * affine;
Geom::Point p3 = cl->p3 * affine;
double min_x = p0[Geom::X];
double min_y = p0[Geom::Y];
double max_x = p0[Geom::X];
double max_y = p0[Geom::Y];
min_x = MIN( min_x, p1[Geom::X] );
min_y = MIN( min_y, p1[Geom::Y] );
max_x = MAX( max_x, p1[Geom::X] );
max_y = MAX( max_y, p1[Geom::Y] );
min_x = MIN( min_x, p2[Geom::X] );
min_y = MIN( min_y, p2[Geom::Y] );
max_x = MAX( max_x, p2[Geom::X] );
max_y = MAX( max_y, p2[Geom::Y] );
min_x = MIN( min_x, p3[Geom::X] );
min_y = MIN( min_y, p3[Geom::Y] );
max_x = MAX( max_x, p3[Geom::X] );
max_y = MAX( max_y, p3[Geom::Y] );
item->x1 = round( min_x - 1 );
item->y1 = round( min_y - 1 );
item->x2 = round( max_x + 1 );
item->y2 = round( max_y + 1 );
item->canvas->requestRedraw(item->x1, item->y1, item->x2, item->y2);
}
}
} // namespace
#define EPSILON 1e-6
#define DIFFER(a,b) (fabs ((a) - (b)) > EPSILON)
void SPCtrlCurve::setCoords( gdouble x0, gdouble y0, gdouble x1, gdouble y1,
gdouble x2, gdouble y2, gdouble x3, gdouble y3 )
{
Geom::Point q0( x0, y0 );
Geom::Point q1( x1, y1 );
Geom::Point q2( x2, y2 );
Geom::Point q3( x3, y3 );
setCoords( q0, q1, q2, q3 );
}
void SPCtrlCurve::setCoords( Geom::Point const &q0, Geom::Point const &q1,
Geom::Point const &q2, Geom::Point const &q3)
{
if (DIFFER(p0[Geom::X], q0[Geom::X]) || DIFFER(p0[Geom::Y], q0[Geom::Y]) ||
DIFFER(p1[Geom::X], q1[Geom::X]) || DIFFER(p1[Geom::Y], q1[Geom::Y]) ||
DIFFER(p2[Geom::X], q2[Geom::X]) || DIFFER(p2[Geom::Y], q2[Geom::Y]) ||
DIFFER(p3[Geom::X], q3[Geom::X]) || DIFFER(p3[Geom::Y], q3[Geom::Y]) ) {
p0 = q0;
p1 = q1;
p2 = q2;
p3 = q3;
sp_canvas_item_request_update( this );
}
}
/*
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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