mirror of
https://github.com/RGBCube/serenity
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5f15fb17d9
This patch adds a very basic implementation of the classic brush tool. It features a wide brush with a falloff around the edges.
114 lines
3.9 KiB
C++
114 lines
3.9 KiB
C++
/*
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* Copyright (c) 2020, Ben Jilks <benjyjilks@gmail.com>
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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 "BrushTool.h"
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#include "ImageEditor.h"
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#include "Layer.h"
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#include <LibGUI/Action.h>
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#include <LibGUI/Painter.h>
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#include <LibGfx/Color.h>
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#include <LibGfx/Rect.h>
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namespace PixelPaint {
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BrushTool::BrushTool()
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{
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}
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BrushTool::~BrushTool()
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{
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}
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void BrushTool::on_mousedown(Layer&, GUI::MouseEvent& event, GUI::MouseEvent&)
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{
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if (event.button() != GUI::MouseButton::Left && event.button() != GUI::MouseButton::Right)
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return;
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m_last_position = event.position();
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}
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void BrushTool::on_mousemove(Layer& layer, GUI::MouseEvent& event, GUI::MouseEvent&)
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{
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if (!(event.buttons() & GUI::MouseButton::Left || event.buttons() & GUI::MouseButton::Right))
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return;
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draw_line(layer.bitmap(), m_editor->color_for(event), m_last_position, event.position());
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layer.did_modify_bitmap(*m_editor->image());
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m_last_position = event.position();
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}
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void BrushTool::draw_point(Gfx::Bitmap& bitmap, const Gfx::Color& color, const Gfx::IntPoint& point)
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{
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for (int y = point.y() - m_size; y < point.y() + m_size; y++) {
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for (int x = point.x() - m_size; x < point.x() + m_size; x++) {
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auto distance = point.distance_from({ x, y });
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if (x < 0 || x >= bitmap.width() || y < 0 || y >= bitmap.height())
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continue;
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if (distance >= m_size)
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continue;
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auto falloff = (1.0 - (distance / (float)m_size)) * 0.2;
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auto pixel_color = color;
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pixel_color.set_alpha(falloff * 255);
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bitmap.set_pixel(x, y, bitmap.get_pixel(x, y).blend(pixel_color));
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}
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}
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}
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void BrushTool::draw_line(Gfx::Bitmap& bitmap, const Gfx::Color& color, const Gfx::IntPoint& start, const Gfx::IntPoint& end)
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{
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int length_x = end.x() - start.x();
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int length_y = end.y() - start.y();
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float y_step = length_y == 0 ? 0 : (float)(length_y) / (float)(length_x);
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if (y_step > abs(length_y))
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y_step = abs(length_y);
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if (y_step < -abs(length_y))
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y_step = -abs(length_y);
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if (y_step == 0 && start.x() == end.x())
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return;
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int start_x = start.x();
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int end_x = end.x();
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int start_y = start.y();
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int end_y = end.y();
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if (start_x > end_x) {
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swap(start_x, end_x);
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swap(start_y, end_y);
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}
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float y = start_y;
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for (int x = start_x; x <= end_x; x++) {
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int start_step_y = y;
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int end_step_y = y + y_step;
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if (start_step_y > end_step_y)
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swap(start_step_y, end_step_y);
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for (int i = start_step_y; i <= end_step_y; i++)
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draw_point(bitmap, color, { x, i });
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y += y_step;
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}
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}
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}
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