mirror of
https://github.com/LadybirdBrowser/ladybird.git
synced 2024-09-21 10:19:03 +03:00
116cf92156
This fits nicer with FloatRect,FloatPoint,FloatSize and gives a much better visual clue about what type of metric is being used.
131 lines
4.4 KiB
C++
131 lines
4.4 KiB
C++
/*
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* Copyright (c) 2020, Sergey Bugaev <bugaevc@serenityos.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "EyesWidget.h"
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#include <LibGUI/Painter.h>
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#include <LibGUI/Window.h>
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#include <LibGUI/WindowServerConnection.h>
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#include <LibGfx/Palette.h>
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#include <math.h>
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EyesWidget::~EyesWidget()
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{
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}
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void EyesWidget::track_cursor_globally()
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{
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ASSERT(window());
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auto window_id = window()->window_id();
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ASSERT(window_id >= 0);
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set_global_cursor_tracking(true);
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GUI::WindowServerConnection::the().send_sync<Messages::WindowServer::SetGlobalCursorTracking>(window_id, true);
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}
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void EyesWidget::mousemove_event(GUI::MouseEvent& event)
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{
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m_mouse_position = event.position();
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update();
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}
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void EyesWidget::paint_event(GUI::PaintEvent& event)
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{
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GUI::Painter painter(*this);
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painter.clear_rect(event.rect(), Gfx::Color());
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for (int i = 0; i < m_num_eyes; i++)
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render_eyeball(i, painter);
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}
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void EyesWidget::render_eyeball(int index, GUI::Painter& painter) const
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{
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auto eye_width = width() / m_num_eyes;
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Gfx::IntRect bounds { index * eye_width, 0, eye_width, height() };
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auto width_thickness = max(int(eye_width / 5.5), 1);
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auto height_thickness = max(int(height() / 5.5), 1);
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bounds.shrink(int(eye_width / 12.5), 0);
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painter.fill_ellipse(bounds, palette().base_text());
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bounds.shrink(width_thickness, height_thickness);
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painter.fill_ellipse(bounds, palette().base());
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Gfx::IntPoint pupil_center = this->pupil_center(bounds);
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Gfx::IntSize pupil_size {
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bounds.width() / 5,
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bounds.height() / 5
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};
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Gfx::IntRect pupil {
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pupil_center.x() - pupil_size.width() / 2,
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pupil_center.y() - pupil_size.height() / 2,
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pupil_size.width(),
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pupil_size.height()
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};
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painter.fill_ellipse(pupil, palette().base_text());
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}
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Gfx::IntPoint EyesWidget::pupil_center(Gfx::IntRect& eyeball_bounds) const
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{
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auto mouse_vector = m_mouse_position - eyeball_bounds.center();
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double dx = mouse_vector.x();
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double dy = mouse_vector.y();
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double mouse_distance = sqrt(dx * dx + dy * dy);
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if (mouse_distance == 0.0)
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return eyeball_bounds.center();
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double width_squared = eyeball_bounds.width() * eyeball_bounds.width();
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double height_squared = eyeball_bounds.height() * eyeball_bounds.height();
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double max_distance_along_this_direction;
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if (dx != 0 && abs(dx) >= abs(dy)) {
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double slope = dy / dx;
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double slope_squared = slope * slope;
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max_distance_along_this_direction = 0.25 * sqrt(
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(slope_squared + 1) /
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(1 / width_squared + slope_squared / height_squared)
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);
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} else if (dy != 0 && abs(dy) >= abs(dx)) {
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double slope = dx / dy;
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double slope_squared = slope * slope;
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max_distance_along_this_direction = 0.25 * sqrt(
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(slope_squared + 1) /
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(slope_squared / width_squared + 1 / height_squared)
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);
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} else {
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ASSERT_NOT_REACHED();
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}
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double scale = min(1.0, max_distance_along_this_direction / mouse_distance);
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return {
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eyeball_bounds.center().x() + int(dx * scale),
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eyeball_bounds.center().y() + int(dy * scale)
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};
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}
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