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/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
* Copyright (c) 2021, Mustafa Quraish <mustafa@serenityos.org>
* Copyright (c) 2022, MacDue <macdue@dueutil.tech>
* Copyright (c) 2022, the SerenityOS developers.
*
* 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/CheckBox.h>
#include <LibGUI/Label.h>
#include <LibGUI/Menu.h>
#include <LibGUI/Painter.h>
#include <LibGUI/ValueSlider.h>
#include <LibGfx/AntiAliasingPainter.h>
namespace PixelPaint {
void LineTool::on_mousedown(Layer* layer, MouseEvent& event)
{
if (!layer)
return;
auto& layer_event = event.layer_event();
if (layer_event.button() != GUI::MouseButton::Primary && layer_event.button() != GUI::MouseButton::Secondary)
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::draw_using(GUI::Painter& painter, Gfx::IntPoint start_position, Gfx::IntPoint end_position, Color color, int thickness)
{
if (m_antialias_enabled) {
Gfx::AntiAliasingPainter aa_painter { painter };
auto as_float_point = [](auto const& point) {
return Gfx::FloatPoint { point.x(), point.y() };
};
aa_painter.draw_line(as_float_point(start_position), as_float_point(end_position), color, thickness);
} else {
painter.draw_line(start_position, end_position, color, thickness);
}
}
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->get_scratch_edited_bitmap());
draw_using(painter, m_line_start_position, m_line_end_position, m_editor->color_for(m_drawing_button), m_thickness);
m_drawing_button = GUI::MouseButton::None;
auto modified_rect = Gfx::IntRect::from_two_points(m_line_start_position, m_line_end_position).inflated(m_thickness * 2, m_thickness * 2);
layer->did_modify_bitmap(modified_rect);
m_editor->update();
m_editor->did_complete_action(tool_name());
}
}
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())
m_line_end_position = constrain_line_angle(m_drag_start_position, layer_event.position());
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());
painter.translate(editor_layer_location(*layer));
auto preview_start = editor_stroke_position(m_line_start_position, m_thickness);
auto preview_end = editor_stroke_position(m_line_end_position, m_thickness);
draw_using(painter, preview_start, preview_end, m_editor->color_for(m_drawing_button), AK::max(m_thickness * m_editor->scale(), 1));
}
bool 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();
return true;
}
return Tool::on_keydown(event);
}
ErrorOr<GUI::Widget*> LineTool::get_properties_widget()
{
if (!m_properties_widget) {
auto properties_widget = TRY(GUI::Widget::try_create());
(void)TRY(properties_widget->try_set_layout<GUI::VerticalBoxLayout>());
auto thickness_container = TRY(properties_widget->try_add<GUI::Widget>());
thickness_container->set_fixed_height(20);
(void)TRY(thickness_container->try_set_layout<GUI::HorizontalBoxLayout>());
auto thickness_label = TRY(thickness_container->try_add<GUI::Label>("Thickness:"));
thickness_label->set_text_alignment(Gfx::TextAlignment::CenterLeft);
thickness_label->set_fixed_size(80, 20);
auto thickness_slider = TRY(thickness_container->try_add<GUI::ValueSlider>(Orientation::Horizontal, "px"_short_string));
thickness_slider->set_range(1, 10);
thickness_slider->set_value(m_thickness);
thickness_slider->on_change = [this](int value) {
m_thickness = value;
};
set_primary_slider(thickness_slider);
auto mode_container = TRY(properties_widget->try_add<GUI::Widget>());
mode_container->set_fixed_height(20);
(void)TRY(mode_container->try_set_layout<GUI::HorizontalBoxLayout>());
auto mode_label = TRY(mode_container->try_add<GUI::Label>("Mode:"));
mode_label->set_text_alignment(Gfx::TextAlignment::CenterLeft);
mode_label->set_fixed_size(80, 20);
auto aa_enable_checkbox = TRY(mode_container->try_add<GUI::CheckBox>(TRY("Anti-alias"_string)));
aa_enable_checkbox->on_checked = [this](bool checked) {
m_antialias_enabled = checked;
};
aa_enable_checkbox->set_checked(true);
m_properties_widget = properties_widget;
}
return m_properties_widget.ptr();
}
}
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