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// SPDX-License-Identifier: GPL-2.0-or-later
/**
* A class for previewing a canvas rotation.
*/
/*
* Author:
* Tavmjong Bah
*
* Copyright (C) 2020 Tavmjong Bah
*
* Rewrite of SPCanvasRotate.
*
* Released under GNU GPL v2+, read the file 'COPYING' for more information.
*/
#include <cairomm/cairomm.h>
#include <gdkmm/event.h>
#include "canvas-item-rotate.h"
#include "color.h" // SP_RGBA_x_F
#include "desktop.h"
#include "inkscape.h"
#include "display/cairo-utils.h" // Copy Cairo surface.
#include "ui/widget/canvas.h"
namespace Inkscape {
/**
* Create an null control rotate.
*/
CanvasItemRotate::CanvasItemRotate(CanvasItemGroup *group)
: CanvasItem(group)
{
_name = "CanvasItemRotate";
_pickable = true; // We need the events!
_bounds = Geom::Rect(-Geom::infinity(), -Geom::infinity(), Geom::infinity(), Geom::infinity());
}
/**
* Returns distance between point in canvas units and nearest point on rotate.
*/
double CanvasItemRotate::closest_distance_to(Geom::Point const &p)
{
double d = Geom::infinity();
std::cerr << "CanvasItemRotate::closest_distance_to: Not implemented!" << std::endl;
return d;
}
/**
* Returns true if point p (in canvas units) is within tolerance (canvas units) distance of rotate.
*/
bool CanvasItemRotate::contains(Geom::Point const &p, double tolerance)
{
return true; // We're always picked!
}
/**
* Update and redraw control rotate.
*/
void CanvasItemRotate::update(Geom::Affine const &affine)
{
_affine = affine;
request_redraw();
}
/**
* Render rotate to screen via Cairo.
*/
void CanvasItemRotate::render(Inkscape::CanvasItemBuffer *buf)
{
return; // We do no proper rendering!
}
/**
* Start
*/
void CanvasItemRotate::start(SPDesktop *desktop)
{
_desktop = desktop;
_current_angle = 0.0;
_surface_copy = ink_cairo_surface_copy(_canvas->get_backing_store());
}
/**
* Render to widget.
*/
void CanvasItemRotate::paint()
{
auto background = _canvas->get_backing_store();
if (!background) {
std::cerr << "CanvasItemRotate::paint(): No background!" << std::endl;
return;
}
double width = background->get_width();
double height = background->get_height();
// Draw rotated canvas.
auto context = Cairo::Context::create(background);
context->set_operator(Cairo::OPERATOR_SOURCE);
context->translate(width/2.0, height/2.0);
context->rotate(Geom::rad_from_deg(-_current_angle));
context->translate(-width/2.0, -height/2.0);
context->set_source(_surface_copy, 0, 0);
context->paint();
_canvas->queue_draw();
}
/**
* Handle events.
*/
bool CanvasItemRotate::handle_event(GdkEvent *event)
{
// Get geometry
Geom::Rect viewbox = _canvas->get_area_world();
_center = viewbox.midpoint();
switch (event->type) {
case GDK_MOTION_NOTIFY:
{
Geom::Point cursor( event->motion.x, event->motion.y );
// Both cursor and center are in window coordinates
Geom::Point rcursor( cursor - _center );
double angle = Geom::deg_from_rad( Geom::atan2(rcursor) );
// Set start angle
if (_start_angle < -360) {
_start_angle = angle;
}
const double rotation_snap = 15;
double delta_angle = _start_angle - angle;
if (event->motion.state & GDK_SHIFT_MASK &&
event->motion.state & GDK_CONTROL_MASK) {
delta_angle = 0;
} else if (event->motion.state & GDK_SHIFT_MASK) {
delta_angle = round(delta_angle/rotation_snap) * rotation_snap;
} else if (event->motion.state & GDK_CONTROL_MASK) {
// ?
} else if (event->motion.state & GDK_MOD1_MASK) {
// Decimal raw angle
} else {
delta_angle = floor(delta_angle);
}
_current_angle = delta_angle;
// Correct line for snapping of angle
double distance = rcursor.length();
_cursor = Geom::Point::polar( Geom::rad_from_deg(angle), distance );
// Update screen
paint();
break;
}
case GDK_BUTTON_RELEASE:
{
// Rotate the actual canvas
SPDesktop *desktop = SP_ACTIVE_DESKTOP; // FIXME..
desktop->rotate_relative_center_point (desktop->w2d(_center),
(desktop->w2d().det() > 0 ? -1 : 1) *
Geom::rad_from_deg(_current_angle) );
// We're done
ungrab();
hide();
_start_angle = -1000;
break;
}
case GDK_KEY_PRESS:
// std::cout << " Key press: " << std::endl;
break;
case GDK_KEY_RELEASE:
// std::cout << " Key release: " << std::endl;
break;
default:
// ui_dump_event (event, "sp_canvas_rotate_event: unwanted event: ");
break;
}
if (event->type == GDK_KEY_PRESS) return false; // Why?
// Don't emit event signal!
return true;
}
} // 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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