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PixelPaint: Add lasso selection tool

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Lasso selection works by allowing the user to draw an arbitrary shape
much like the pen tool and ensuring the shape is closed by connecting
the start/end points when the user is done drawing. Everything inside
the shape becomes the selection.

Selection is determined via an outer flood fill. We begin a flood fill
from a point that is guaranteed to be outside of the drawn shape, and
anything the fill doesn't touch is determined to be the selection
region.
This commit is contained in:
Timothy Slater 2022-09-07 07:46:16 -05:00 • committed by Andreas Kling
parent dc5402f61e
commit 3d542b0c38
5 changed files with 281 additions and 0 deletions
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47
Userland/Applications/PixelPaint/Tools/LassoSelectTool.h Normal file
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/*
* Copyright (c) 2022, Timothy Slater <tslater2006@gmail.com>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include "../Selection.h"
#include "Tool.h"
#include <AK/Vector.h>
#include <LibGUI/Widget.h>
namespace PixelPaint {
class LassoSelectTool final : public Tool {
public:
LassoSelectTool() = default;
virtual ~LassoSelectTool() = default;
virtual void on_mousedown(Layer*, MouseEvent& event) override;
virtual void on_mouseup(Layer*, MouseEvent& event) override;
virtual void on_mousemove(Layer*, MouseEvent& event) override;
virtual bool on_keydown(GUI::KeyEvent const&) override;
virtual void on_second_paint(Layer const*, GUI::PaintEvent&) override;
virtual GUI::Widget* get_properties_widget() override;
private:
virtual StringView tool_name() const override { return "Lasso Select Tool"sv; }
void flood_lasso_selection(Gfx::Bitmap&, Gfx::IntPoint);
RefPtr<GUI::Widget> m_properties_widget;
Selection::MergeMode m_merge_mode { Selection::MergeMode::Set };
Gfx::IntPoint m_start_position;
Gfx::IntPoint m_most_recent_position;
RefPtr<Gfx::Bitmap> m_selection_bitmap;
RefPtr<Gfx::Bitmap> m_preview_bitmap;
Gfx::IntPoint m_top_left;
Gfx::IntPoint m_bottom_right;
bool m_selecting { false };
};
}