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- /*
- * Copyright (c) 2021, Andreas Kling <kling@serenityos.org>
- *
- * SPDX-License-Identifier: BSD-2-Clause
- */
- #include "Selection.h"
- #include "ImageEditor.h"
- #include <LibGfx/Painter.h>
- namespace PixelPaint {
- constexpr int marching_ant_length = 4;
- void Selection::paint(Gfx::Painter& painter, ImageEditor const& editor)
- {
- draw_marching_ants(painter, editor.image_rect_to_editor_rect(m_rect).to_type<int>());
- }
- Selection::Selection(ImageEditor& editor)
- : m_editor(editor)
- {
- m_marching_ants_timer = Core::Timer::create_repeating(80, [this] {
- ++m_marching_ants_offset;
- m_marching_ants_offset %= marching_ant_length;
- if (!is_empty())
- m_editor.update();
- });
- m_marching_ants_timer->start();
- }
- void Selection::draw_marching_ants(Gfx::Painter& painter, Gfx::IntRect const& rect) const
- {
- int offset = m_marching_ants_offset;
- auto draw_pixel = [&](int x, int y) {
- if ((offset % marching_ant_length) != 0)
- painter.set_pixel(x, y, Color::Black);
- offset++;
- };
- // Top line
- for (int x = rect.left(); x <= rect.right(); ++x)
- draw_pixel(x, rect.top());
- // Right line
- for (int y = rect.top() + 1; y <= rect.bottom(); ++y)
- draw_pixel(rect.right(), y);
- // Bottom line
- for (int x = rect.right() - 1; x >= rect.left(); --x)
- draw_pixel(x, rect.bottom());
- // Left line
- for (int y = rect.bottom() - 1; y > rect.top(); --y)
- draw_pixel(rect.left(), y);
- }
- }
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