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/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
* Copyright (c) 2021, Mustafa Quraish <mustafa@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include "LineTool.h"
#include "ImageEditor.h"
#include "Layer.h"
#include <AK/Math.h>
#include <LibGUI/Action.h>
#include <LibGUI/BoxLayout.h>
#include <LibGUI/Label.h>
#include <LibGUI/Menu.h>
#include <LibGUI/Painter.h>
#include <LibGUI/ValueSlider.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 = AK::atan2<float>(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 = AK::hypot<float>(diff.x(), diff.y());
return { start_pos.x() + (int)(AK::cos(constrained_angle) * line_length),
start_pos.y() + (int)(AK::sin(constrained_angle) * line_length) };
}
LineTool::LineTool()
{
}
LineTool::~LineTool()
{
}
void LineTool::on_mousedown(Layer* layer, MouseEvent& event)
{
if (!layer)
return;
auto& layer_event = event.layer_event();
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_drag_start_position = layer_event.position();
m_line_start_position = layer_event.position();
m_line_end_position = layer_event.position();
m_editor->update();
}
void LineTool::on_mouseup(Layer* layer, MouseEvent& event)
{
if (!layer)
return;
auto& layer_event = event.layer_event();
if (layer_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->update();
m_editor->did_complete_action();
}
}
void LineTool::on_mousemove(Layer* layer, MouseEvent& event)
{
if (!layer)
return;
auto& layer_event = event.layer_event();
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_drag_start_position, layer_event.position(), ANGLE_STEP);
} else {
m_line_end_position = layer_event.position();
}
if (layer_event.alt()) {
m_line_start_position = m_drag_start_position + (m_drag_start_position - m_line_end_position);
} else {
m_line_start_position = m_drag_start_position;
}
m_editor->update();
}
void LineTool::on_second_paint(Layer const* layer, GUI::PaintEvent& event)
{
if (!layer || m_drawing_button == GUI::MouseButton::None)
return;
GUI::Painter painter(*m_editor);
painter.add_clip_rect(event.rect());
auto preview_start = editor_stroke_position(m_line_start_position, m_thickness);
auto preview_end = editor_stroke_position(m_line_end_position, m_thickness);
painter.draw_line(preview_start, preview_end, m_editor->color_for(m_drawing_button), AK::max(m_thickness * m_editor->scale(), 1));
}
void LineTool::on_keydown(GUI::KeyEvent& event)
{
Tool::on_keydown(event);
if (event.key() == Key_Escape && m_drawing_button != GUI::MouseButton::None) {
m_drawing_button = GUI::MouseButton::None;
m_editor->update();
event.accept();
}
}
GUI::Widget* LineTool::get_properties_widget()
{
if (!m_properties_widget) {
m_properties_widget = GUI::Widget::construct();
m_properties_widget->set_layout<GUI::VerticalBoxLayout>();
auto& thickness_container = m_properties_widget->add<GUI::Widget>();
thickness_container.set_fixed_height(20);
thickness_container.set_layout<GUI::HorizontalBoxLayout>();
auto& thickness_label = thickness_container.add<GUI::Label>("Thickness:");
thickness_label.set_text_alignment(Gfx::TextAlignment::CenterLeft);
thickness_label.set_fixed_size(80, 20);
auto& thickness_slider = thickness_container.add<GUI::ValueSlider>(Orientation::Horizontal, "px");
thickness_slider.set_range(1, 10);
thickness_slider.set_value(m_thickness);
thickness_slider.on_change = [&](int value) {
m_thickness = value;
};
set_primary_slider(&thickness_slider);
}
return m_properties_widget.ptr();
}
}
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