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/*
* Copyright (c) 2020, Sergey Bugaev <bugaevc@serenityos.org>
* Copyright (c) 2022, the SerenityOS developers.
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include "EyesWidget.h"
#include <AK/Math.h>
#include <LibGUI/Painter.h>
#include <LibGUI/Window.h>
#include <LibGfx/Palette.h>
void EyesWidget::track_mouse_move(Gfx::IntPoint const& point)
{
m_mouse_position = point - window()->position();
update();
}
void EyesWidget::paint_event(GUI::PaintEvent& event)
{
GUI::Painter painter(*this);
Gfx::AntiAliasingPainter aa_painter { painter };
painter.clear_rect(event.rect(), Gfx::Color());
for (int i = 0; i < m_full_rows; i++) {
for (int j = 0; j < m_eyes_in_row; j++)
render_eyeball(i, j, aa_painter);
}
for (int i = 0; i < m_extra_columns; ++i)
render_eyeball(m_full_rows, i, aa_painter);
}
void EyesWidget::render_eyeball(int row, int column, Gfx::AntiAliasingPainter& painter) const
{
auto eye_width = width() / m_eyes_in_row;
auto eye_height = height() / m_num_rows;
Gfx::IntRect bounds { column * eye_width, row * eye_height, eye_width, eye_height };
auto width_thickness = max(int(eye_width / 5.5), 1);
auto height_thickness = max(int(eye_height / 5.5), 1);
bounds.shrink(int(eye_width / 12.5), 0);
painter.fill_ellipse(bounds, palette().base_text());
bounds.shrink(width_thickness, height_thickness);
painter.fill_ellipse(bounds, palette().base());
Gfx::IntPoint pupil_center = this->pupil_center(bounds);
Gfx::IntSize pupil_size {
bounds.width() / 5,
bounds.height() / 5
};
Gfx::IntRect 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::IntPoint EyesWidget::pupil_center(Gfx::IntRect& 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 = AK::hypot(dx, 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;
// clang-format off
if (dx != 0 && AK::abs(dx) >= AK::abs(dy)) {
double slope = dy / dx;
double slope_squared = slope * slope;
max_distance_along_this_direction = 0.25 * AK::sqrt(
(slope_squared + 1) /
(1 / width_squared + slope_squared / height_squared)
);
} else if (dy != 0 && AK::abs(dy) >= AK::abs(dx)) {
double slope = dx / dy;
double slope_squared = slope * slope;
max_distance_along_this_direction = 0.25 * AK::sqrt(
(slope_squared + 1) /
(slope_squared / width_squared + 1 / height_squared)
);
} else {
VERIFY_NOT_REACHED();
}
// clang-format on
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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