ladybird/Userland/Applications/PixelPaint/Tools/RectangleTool.cpp

/*
 * 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 "RectangleTool.h"
#include "../ImageEditor.h"
#include "../Layer.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/RadioButton.h>
#include <LibGUI/TextBox.h>
#include <LibGUI/ValueSlider.h>
#include <LibGfx/AntiAliasingPainter.h>
#include <LibGfx/Rect.h>

namespace PixelPaint {

void RectangleTool::draw_using(GUI::Painter& painter, Gfx::IntPoint start_position, Gfx::IntPoint end_position, int thickness, int corner_radius)
{
    Gfx::IntRect rect;
    if (m_draw_mode == DrawMode::FromCenter) {
        auto delta = end_position - start_position;
        rect = Gfx::IntRect::from_two_points(start_position - delta, end_position);
    } else {
        rect = Gfx::IntRect::from_two_points(start_position, end_position);
    }

    switch (m_fill_mode) {
    case FillMode::Fill:
        painter.fill_rect(rect, m_editor->color_for(m_drawing_button));
        break;
    case FillMode::Outline:
        painter.draw_rect_with_thickness(rect, m_editor->color_for(m_drawing_button), thickness);
        break;
    case FillMode::Gradient:
        painter.fill_rect_with_gradient(rect, m_editor->primary_color(), m_editor->secondary_color());
        break;
    case FillMode::RoundedCorners: {
        int min_dimension = corner_radius * 2;
        if (rect.width() < min_dimension)
            rect.set_width(min_dimension);
        if (rect.height() < min_dimension)
            rect.set_height(min_dimension);
        if (m_antialias_enabled) {
            Gfx::AntiAliasingPainter aa_painter { painter };
            aa_painter.fill_rect_with_rounded_corners(rect, m_editor->color_for(m_drawing_button), corner_radius);
        } else {
            painter.fill_rect_with_rounded_corners(rect, m_editor->color_for(m_drawing_button), corner_radius);
        }
        break;
    }
    default:
        VERIFY_NOT_REACHED();
    }
}

void RectangleTool::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_rectangle_start_position = layer_event.position();
    m_rectangle_end_position = layer_event.position();
    m_editor->update();
}

void RectangleTool::on_mouseup(Layer* layer, MouseEvent& event)
{
    if (!layer)
        return;

    if (event.layer_event().button() == m_drawing_button) {
        GUI::Painter painter(layer->get_scratch_edited_bitmap());
        draw_using(painter, m_rectangle_start_position, m_rectangle_end_position, m_thickness, m_corner_radius);
        m_drawing_button = GUI::MouseButton::None;
        auto modified_rect = Gfx::IntRect::from_two_points(m_rectangle_start_position, m_rectangle_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 RectangleTool::on_mousemove(Layer* layer, MouseEvent& event)
{
    if (!layer)
        return;

    if (m_drawing_button == GUI::MouseButton::None)
        return;

    m_draw_mode = event.layer_event().alt() ? DrawMode::FromCenter : DrawMode::FromCorner;

    if (event.layer_event().shift())
        m_rectangle_end_position = m_rectangle_start_position.end_point_for_aspect_ratio(event.layer_event().position(), 1.0);
    else if (m_aspect_ratio.has_value())
        m_rectangle_end_position = m_rectangle_start_position.end_point_for_aspect_ratio(event.layer_event().position(), m_aspect_ratio.value());
    else
        m_rectangle_end_position = event.layer_event().position();

    m_editor->update();
}

void RectangleTool::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 start_position = editor_stroke_position(m_rectangle_start_position, m_thickness);
    auto end_position = editor_stroke_position(m_rectangle_end_position, m_thickness);
    draw_using(painter, start_position, end_position, AK::max(m_thickness * m_editor->scale(), 1), m_corner_radius * m_editor->scale());
}

bool RectangleTool::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*> RectangleTool::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_or_radius_container = TRY(properties_widget->try_add<GUI::Widget>());
        thickness_or_radius_container->set_fixed_height(20);
        (void)TRY(thickness_or_radius_container->try_set_layout<GUI::HorizontalBoxLayout>());

        auto thickness_or_radius_label = TRY(thickness_or_radius_container->try_add<GUI::Label>());
        thickness_or_radius_label->set_text_alignment(Gfx::TextAlignment::CenterLeft);
        thickness_or_radius_label->set_fixed_size(80, 20);

        auto thickness_or_radius_slider = TRY(thickness_or_radius_container->try_add<GUI::ValueSlider>(Orientation::Horizontal, String::from_utf8_short_string("px"sv)));

        thickness_or_radius_slider->on_change = [&](int value) {
            if (m_fill_mode == FillMode::RoundedCorners) {
                m_corner_radius = value;
            } else
                m_thickness = value;
        };

        auto update_slider = [this, thickness_or_radius_label, thickness_or_radius_slider] {
            auto update_values = [&](auto label, int value, int range_min, int range_max = 10) {
                thickness_or_radius_label->set_text(label);
                thickness_or_radius_slider->set_range(range_min, range_max);
                thickness_or_radius_slider->set_value(value);
            };
            if (m_fill_mode == FillMode::RoundedCorners)
                update_values("Radius:", m_corner_radius, 0, 50);
            else
                update_values("Thickness:", m_thickness, 1);
        };

        update_slider();
        set_primary_slider(thickness_or_radius_slider);

        auto mode_container = TRY(properties_widget->try_add<GUI::Widget>());
        mode_container->set_fixed_height(90);
        (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(30, 20);

        auto mode_radio_container = TRY(mode_container->try_add<GUI::Widget>());
        (void)TRY(mode_radio_container->try_set_layout<GUI::VerticalBoxLayout>());
        auto outline_mode_radio = TRY(mode_radio_container->try_add<GUI::RadioButton>(String::from_utf8_short_string("Outline"sv)));
        auto fill_mode_radio = TRY(mode_radio_container->try_add<GUI::RadioButton>(String::from_utf8_short_string("Fill"sv)));
        auto gradient_mode_radio = TRY(mode_radio_container->try_add<GUI::RadioButton>(TRY(String::from_utf8("Gradient"sv))));
        mode_radio_container->set_fixed_width(70);

        auto rounded_corners_mode_radio = TRY(mode_radio_container->try_add<GUI::RadioButton>(String::from_utf8_short_string("Rounded"sv)));

        outline_mode_radio->on_checked = [this, update_slider](bool) {
            m_fill_mode = FillMode::Outline;
            update_slider();
        };
        fill_mode_radio->on_checked = [this, update_slider](bool) {
            m_fill_mode = FillMode::Fill;
            update_slider();
        };
        gradient_mode_radio->on_checked = [this, update_slider](bool) {
            m_fill_mode = FillMode::Gradient;
            update_slider();
        };
        rounded_corners_mode_radio->on_checked = [this, update_slider](bool) {
            m_fill_mode = FillMode::RoundedCorners;
            update_slider();
        };
        outline_mode_radio->set_checked(true);

        auto mode_extras_container = TRY(mode_container->try_add<GUI::Widget>());
        (void)TRY(mode_extras_container->try_set_layout<GUI::VerticalBoxLayout>());

        auto aa_enable_checkbox = TRY(mode_extras_container->try_add<GUI::CheckBox>(TRY(String::from_utf8("Anti-alias"sv))));
        aa_enable_checkbox->on_checked = [this](bool checked) {
            m_antialias_enabled = checked;
        };
        aa_enable_checkbox->set_checked(true);

        auto aspect_container = TRY(mode_extras_container->try_add<GUI::Widget>());
        (void)TRY(aspect_container->try_set_layout<GUI::VerticalBoxLayout>());
        aspect_container->set_fixed_width(75);

        auto aspect_label = TRY(aspect_container->try_add<GUI::Label>("Aspect Ratio:"));
        aspect_label->set_text_alignment(Gfx::TextAlignment::CenterLeft);
        aspect_label->set_fixed_size(75, 20);

        auto aspect_fields_container = TRY(aspect_container->try_add<GUI::Widget>());
        aspect_fields_container->set_fixed_width(75);
        (void)TRY(aspect_fields_container->try_set_layout<GUI::HorizontalBoxLayout>());

        m_aspect_w_textbox = TRY(aspect_fields_container->try_add<GUI::TextBox>());
        m_aspect_w_textbox->set_fixed_height(20);
        m_aspect_w_textbox->set_fixed_width(25);
        m_aspect_w_textbox->on_change = [this] {
            auto x = m_aspect_w_textbox->text().to_int().value_or(0);
            auto y = m_aspect_h_textbox->text().to_int().value_or(0);
            if (x > 0 && y > 0) {
                m_aspect_ratio = (float)x / (float)y;
            } else {
                m_aspect_ratio = {};
            }
        };

        auto multiply_label = TRY(aspect_fields_container->try_add<GUI::Label>("x"));
        multiply_label->set_text_alignment(Gfx::TextAlignment::Center);
        multiply_label->set_fixed_size(10, 20);

        m_aspect_h_textbox = TRY(aspect_fields_container->try_add<GUI::TextBox>());
        m_aspect_h_textbox->set_fixed_height(20);
        m_aspect_h_textbox->set_fixed_width(25);
        m_aspect_h_textbox->on_change = [this] { m_aspect_w_textbox->on_change(); };

        m_properties_widget = properties_widget;
    }

    return m_properties_widget.ptr();
}

}