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https://github.com/RGBCube/serenity
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Polygonal selection tool allows for the drawing of any arbitrary polygonal shape. It tracks clicked points in a vector, upon double clicking we finalize the polygon and generate the selection mask. The user can press the escape key during selection to cancel. The mask is generated as follows: - First we calculate the size of the bounding rect needed to hold the polygon - We add 2 pixels to height/width to allow us a 1 pixel border, the polygon will be centered in this bitmap - Draw the polygon into the bitmap via Gfx::Painter, making sure to connect final polygon point to the first to ensure an enclosed shape - Generate a selection mask the size of the bitmap, with all pixels initially selected - Perform a flood fill from (0,0) which is guaranteed to be outside the polygon - For every pixel reached by the flood fill, we clear the selected pixel from the selection mask - Finally we merge the selection mask like other selection tools.
41 lines
1.4 KiB
C++
41 lines
1.4 KiB
C++
/*
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* Copyright (c) 2022, the SerenityOS developers.
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include "../Selection.h"
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#include "Tool.h"
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#include <AK/Vector.h>
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#include <LibGUI/Widget.h>
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namespace PixelPaint {
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class PolygonalSelectTool final : public Tool {
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public:
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PolygonalSelectTool() = default;
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virtual ~PolygonalSelectTool() = default;
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virtual void on_doubleclick(Layer*, MouseEvent& event) override;
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virtual void on_mousedown(Layer*, MouseEvent& event) override;
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virtual void on_mousemove(Layer*, MouseEvent& event) override;
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virtual void on_keydown(GUI::KeyEvent&) override;
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virtual void on_second_paint(Layer const*, GUI::PaintEvent&) override;
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virtual GUI::Widget* get_properties_widget() override;
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virtual Variant<Gfx::StandardCursor, NonnullRefPtr<Gfx::Bitmap>> cursor() override { return Gfx::StandardCursor::Crosshair; }
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virtual Gfx::IntPoint point_position_to_preferred_cell(Gfx::FloatPoint const& position) const override;
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private:
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virtual void flood_polygon_selection(Gfx::Bitmap&, Gfx::IntPoint);
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virtual void process_polygon();
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virtual StringView tool_name() const override { return "Polygonal Select Tool"sv; }
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RefPtr<GUI::Widget> m_properties_widget;
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Selection::MergeMode m_merge_mode { Selection::MergeMode::Set };
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bool m_selecting { false };
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Gfx::IntPoint m_last_selecting_cursor_position;
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Vector<Gfx::IntPoint> m_polygon_points {};
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};
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}
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