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/*
* Copyright (c) 2020, Sergey Bugaev <bugaevc@serenityos.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "EyesWidget.h"
#include <LibGUI/Painter.h>
#include <LibGUI/Window.h>
#include <LibGUI/WindowServerConnection.h>
#include <LibGfx/Palette.h>
#include <math.h>
EyesWidget::~EyesWidget()
{
}
void EyesWidget::track_cursor_globally()
{
ASSERT(window());
auto window_id = window()->window_id();
ASSERT(window_id >= 0);
set_global_cursor_tracking(true);
GUI::WindowServerConnection::the().send_sync<Messages::WindowServer::SetGlobalCursorTracking>(window_id, true);
}
void EyesWidget::mousemove_event(GUI::MouseEvent& event)
{
m_mouse_position = event.position();
update();
}
void EyesWidget::paint_event(GUI::PaintEvent& event)
{
GUI::Painter painter(*this);
painter.clear_rect(event.rect(), Gfx::Color());
for (int i = 0; i < m_num_eyes; i++)
render_eyeball(i, painter);
}
void EyesWidget::render_eyeball(int index, GUI::Painter& painter) const
{
auto eye_width = width() / m_num_eyes;
Gfx::Rect bounds { index * eye_width, 0, eye_width, height() };
auto thickness = max((width() + height()) / 15, 1);
bounds.shrink(width() / 25, 0);
painter.fill_ellipse(bounds, palette().base_text());
bounds.shrink(thickness, thickness);
painter.fill_ellipse(bounds, palette().base());
Gfx::Point pupil_center = this->pupil_center(bounds);
Gfx::Size pupil_size {
bounds.width() / 5,
bounds.height() / 5
};
Gfx::Rect pupil {
pupil_center.x() - pupil_size.width() / 2,
pupil_center.y() - pupil_size.height() / 2,
pupil_size.width(),
pupil_size.height()
};
painter.fill_ellipse(pupil, palette().base_text());
}
Gfx::Point EyesWidget::pupil_center(Gfx::Rect& eyeball_bounds) const
{
auto mouse_vector = m_mouse_position - eyeball_bounds.center();
double dx = mouse_vector.x();
double dy = mouse_vector.y();
double mouse_distance = sqrt(dx * dx + dy * dy);
if (mouse_distance == 0.0)
return eyeball_bounds.center();
double width_squared = eyeball_bounds.width() * eyeball_bounds.width();
double height_squared = eyeball_bounds.height() * eyeball_bounds.height();
double max_distance_along_this_direction;
if (dx != 0 && abs(dx) >= abs(dy)) {
double slope = dy / dx;
double slope_squared = slope * slope;
max_distance_along_this_direction = 0.25 * sqrt(
(slope_squared + 1) /
(1 / width_squared + slope_squared / height_squared)
);
} else if (dy != 0 && abs(dy) >= abs(dx)) {
double slope = dx / dy;
double slope_squared = slope * slope;
max_distance_along_this_direction = 0.25 * sqrt(
(slope_squared + 1) /
(slope_squared / width_squared + 1 / height_squared)
);
} else {
ASSERT_NOT_REACHED();
}
double scale = min(1.0, max_distance_along_this_direction / mouse_distance);
return {
eyeball_bounds.center().x() + int(dx * scale),
eyeball_bounds.center().y() + int(dy * scale)
};
}
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