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/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include "LineTool.h"
#include "ImageEditor.h"
#include "Layer.h"
#include <LibGUI/Action.h>
#include <LibGUI/Menu.h>
#include <LibGUI/Painter.h>
#include <math.h>
namespace PixelPaint {
static Gfx::IntPoint constrain_line_angle(Gfx::IntPoint const& start_pos, Gfx::IntPoint const& end_pos, float angle_increment)
{
float current_angle = atan2f(end_pos.y() - start_pos.y(), end_pos.x() - start_pos.x()) + float { M_PI * 2 };
float constrained_angle = ((int)((current_angle + angle_increment / 2) / angle_increment)) * angle_increment;
auto diff = end_pos - start_pos;
float line_length = sqrt(diff.x() * diff.x() + diff.y() * diff.y());
return { start_pos.x() + (int)(cosf(constrained_angle) * line_length),
start_pos.y() + (int)(sinf(constrained_angle) * line_length) };
}
LineTool::LineTool()
{
}
LineTool::~LineTool()
{
}
void LineTool::on_mousedown(Layer&, GUI::MouseEvent& layer_event, GUI::MouseEvent&)
{
if (layer_event.button() != GUI::MouseButton::Left && layer_event.button() != GUI::MouseButton::Right)
return;
if (m_drawing_button != GUI::MouseButton::None)
return;
m_drawing_button = layer_event.button();
m_line_start_position = layer_event.position();
m_line_end_position = layer_event.position();
m_editor->update();
}
void LineTool::on_mouseup(Layer& layer, GUI::MouseEvent& event, GUI::MouseEvent&)
{
if (event.button() == m_drawing_button) {
GUI::Painter painter(layer.bitmap());
painter.draw_line(m_line_start_position, m_line_end_position, m_editor->color_for(m_drawing_button), m_thickness);
m_drawing_button = GUI::MouseButton::None;
layer.did_modify_bitmap();
m_editor->did_complete_action();
}
}
void LineTool::on_mousemove(Layer&, GUI::MouseEvent& layer_event, GUI::MouseEvent&)
{
if (m_drawing_button == GUI::MouseButton::None)
return;
if (layer_event.shift()) {
constexpr auto ANGLE_STEP = M_PI / 8;
m_line_end_position = constrain_line_angle(m_line_start_position, layer_event.position(), ANGLE_STEP);
} else {
m_line_end_position = layer_event.position();
}
m_editor->update();
}
void LineTool::on_second_paint(Layer const& layer, GUI::PaintEvent& event)
{
if (m_drawing_button == GUI::MouseButton::None)
return;
GUI::Painter painter(*m_editor);
painter.add_clip_rect(event.rect());
auto preview_start = m_editor->layer_position_to_editor_position(layer, m_line_start_position).to_type<int>();
auto preview_end = m_editor->layer_position_to_editor_position(layer, m_line_end_position).to_type<int>();
painter.draw_line(preview_start, preview_end, m_editor->color_for(m_drawing_button), m_thickness);
}
void LineTool::on_keydown(GUI::KeyEvent& event)
{
if (event.key() == Key_Escape && m_drawing_button != GUI::MouseButton::None) {
m_drawing_button = GUI::MouseButton::None;
m_editor->update();
event.accept();
}
}
void LineTool::on_tool_button_contextmenu(GUI::ContextMenuEvent& event)
{
if (!m_context_menu) {
m_context_menu = GUI::Menu::construct();
m_thickness_actions.set_exclusive(true);
auto insert_action = [&](int size, bool checked = false) {
auto action = GUI::Action::create_checkable(String::number(size), [this, size](auto&) {
m_thickness = size;
});
action->set_checked(checked);
m_thickness_actions.add_action(*action);
m_context_menu->add_action(move(action));
};
insert_action(1, true);
insert_action(2);
insert_action(3);
insert_action(4);
}
m_context_menu->popup(event.screen_position());
}
}
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