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96b52f13e4
Using the rectangle select tool, you can now drag out a selection which will be drawn in the form of "marching ants" :^)
105 lines
2.6 KiB
C++
105 lines
2.6 KiB
C++
/*
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* Copyright (c) 2021, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include "RectangleSelectTool.h"
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#include "Image.h"
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#include "ImageEditor.h"
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#include "Layer.h"
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#include <LibCore/Timer.h>
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#include <LibGUI/Painter.h>
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namespace PixelPaint {
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constexpr int marching_ant_length = 4;
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RectangleSelectTool::RectangleSelectTool()
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{
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m_marching_ants_timer = Core::Timer::create_repeating(80, [this] {
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if (!m_editor)
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return;
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++m_marching_ants_offset;
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m_marching_ants_offset %= marching_ant_length;
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m_editor->update();
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});
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m_marching_ants_timer->start();
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}
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RectangleSelectTool::~RectangleSelectTool()
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{
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}
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void RectangleSelectTool::on_mousedown(Layer&, GUI::MouseEvent&, GUI::MouseEvent& image_event)
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{
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if (image_event.button() != GUI::MouseButton::Left)
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return;
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m_selecting = true;
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m_selection_start = image_event.position();
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m_selection_end = image_event.position();
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m_editor->update();
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}
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void RectangleSelectTool::on_mousemove(Layer&, GUI::MouseEvent&, GUI::MouseEvent& image_event)
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{
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if (!m_selecting)
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return;
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m_selection_end = image_event.position();
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m_editor->update();
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}
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void RectangleSelectTool::on_mouseup(Layer&, GUI::MouseEvent&, GUI::MouseEvent& image_event)
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{
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if (!m_selecting || image_event.button() != GUI::MouseButton::Left)
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return;
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m_selecting = false;
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m_editor->update();
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}
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void RectangleSelectTool::draw_marching_ants(Gfx::Painter& painter, Gfx::IntRect const& rect) const
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{
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int offset = m_marching_ants_offset;
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auto draw_pixel = [&](int x, int y) {
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if ((offset % marching_ant_length) != 0)
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painter.set_pixel(x, y, Color::Black);
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offset++;
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};
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// Top line
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for (int x = rect.left(); x <= rect.right(); ++x)
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draw_pixel(x, rect.top());
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// Right line
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for (int y = rect.top() + 1; y <= rect.bottom(); ++y)
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draw_pixel(rect.right(), y);
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// Bottom line
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for (int x = rect.right() - 1; x >= rect.left(); --x)
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draw_pixel(x, rect.bottom());
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// Left line
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for (int y = rect.bottom() - 1; y > rect.top(); --y)
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draw_pixel(rect.left(), y);
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}
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void RectangleSelectTool::on_second_paint(Layer const&, GUI::PaintEvent& event)
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{
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if (!m_selecting)
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return;
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GUI::Painter painter(*m_editor);
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painter.add_clip_rect(event.rect());
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auto rect_in_image = Gfx::IntRect::from_two_points(m_selection_start, m_selection_end);
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auto rect_in_editor = m_editor->image_rect_to_editor_rect(rect_in_image);
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draw_marching_ants(painter, rect_in_editor.to_type<int>());
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}
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}
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