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ladybird/Userland/Applications/PixelPaint/Tools/GradientTool.cpp
Tim Ledbetter f34b1c7a7e PixelPaint: Make tool properties widget construction non-fallible 
`Tool::get_properties_widget()` now also returns a NNRP to a widget
rather than a raw pointer.
2023-09-25 10:58:31 +02:00

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/*
* Copyright (c) 2023, Torsten Engelmann <engelTorsten@gmx.de>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include "GradientTool.h"
#include "../ImageEditor.h"
#include "../Layer.h"
#include <LibGUI/Action.h>
#include <LibGUI/Application.h>
#include <LibGUI/BoxLayout.h>
#include <LibGUI/Button.h>
#include <LibGUI/CheckBox.h>
#include <LibGUI/ComboBox.h>
#include <LibGUI/ItemListModel.h>
#include <LibGUI/Label.h>
#include <LibGUI/OpacitySlider.h>
#include <LibGUI/Painter.h>
#include <LibGUI/ValueSlider.h>
#include <LibGfx/AntiAliasingPainter.h>
#include <LibGfx/Color.h>
#include <LibGfx/Gradients.h>
#include <LibGfx/Path.h>
#include <LibGfx/Rect.h>
namespace PixelPaint {
Variant<Gfx::StandardCursor, NonnullRefPtr<Gfx::Bitmap const>> GradientTool::cursor()
{
if (m_hover_over_drag_handle || m_hover_over_start_handle || m_hover_over_end_handle || m_hover_over_transversal_a_handle || m_hover_over_transversal_b_handle)
return Gfx::StandardCursor::Hand;
if (m_button_pressed)
return Gfx::StandardCursor::Move;
return Gfx::StandardCursor::Crosshair;
}
void GradientTool::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;
m_button_pressed = true;
if (!m_hover_over_start_handle && !m_hover_over_end_handle && !m_hover_over_transversal_a_handle && !m_hover_over_transversal_b_handle) {
if (has_gradient_data()) {
Gfx::IntPoint movement_delta = layer_event.position() - m_gradient_center.value();
m_gradient_center = layer_event.position();
move_gradient_position(movement_delta);
calculate_gradient_lines();
} else {
m_gradient_center = layer_event.position();
}
}
m_physical_diagonal_layer_length = Gfx::IntPoint(0, 0).distance_from({ layer->rect().width(), layer->rect().height() });
m_editor->update_tool_cursor();
}
void GradientTool::on_mousemove(Layer* layer, MouseEvent& event)
{
// Check if user is hovering over a handle
if (layer && m_editor && !m_button_pressed && has_gradient_data()) {
auto set_hover_flag = [&](bool& flag, Optional<Gfx::IntPoint> const p) {
auto handle_offset = m_editor->content_to_frame_position(layer->location());
float scale = m_editor->scale();
auto frame_postion = p.value().to_type<float>().scaled(scale, scale).translated(handle_offset).to_type<int>();
auto handle = Gfx::IntRect::centered_at(frame_postion, { 16, 16 });
if (flag != handle.contains(event.raw_event().position())) {
flag = !flag;
m_editor->update_tool_cursor();
m_editor->update();
}
};
set_hover_flag(m_hover_over_start_handle, m_gradient_start.value());
set_hover_flag(m_hover_over_drag_handle, m_gradient_center.value());
set_hover_flag(m_hover_over_end_handle, m_gradient_end.value());
if (m_mode == GradientMode::Radial) {
set_hover_flag(m_hover_over_transversal_a_handle, m_gradient_transversal_a.value());
set_hover_flag(m_hover_over_transversal_b_handle, m_gradient_transversal_b.value());
}
}
if (!layer || !m_button_pressed)
return;
auto& layer_event = event.layer_event();
if (!m_hover_over_drag_handle && (m_hover_over_start_handle || m_hover_over_end_handle)) {
auto movement_delta = m_hover_over_start_handle ? layer_event.position() - m_gradient_start.value() : layer_event.position() - m_gradient_end.value();
rotate_gradient_points(m_hover_over_start_handle ? movement_delta.scaled({ -1, -1 }) : movement_delta);
}
if (!m_hover_over_drag_handle && (m_hover_over_transversal_a_handle || m_hover_over_transversal_b_handle)) {
auto distance_to_center = layer_event.position().distance_from(m_gradient_center.value());
auto new_left_right_distance_fraction = distance_to_center / m_gradient_center.value().distance_from(m_gradient_start.value());
calculate_transversal_points(new_left_right_distance_fraction);
}
if (m_hover_over_drag_handle) {
auto movement_delta = layer_event.position() - m_gradient_center.value();
m_gradient_center.value().translate_by(movement_delta);
move_gradient_position(movement_delta);
}
if (!(m_hover_over_drag_handle || m_hover_over_start_handle || m_hover_over_end_handle || m_hover_over_transversal_a_handle || m_hover_over_transversal_b_handle))
update_gradient_with_initial_values(layer_event.position());
// If Shift is pressed, align the gradient horizontally or vertically
if (m_shift_pressed && has_gradient_data() && m_mode == GradientMode::Linear) {
auto delta = m_gradient_center.value() - m_gradient_end.value();
if (AK::abs(delta.x()) < AK::abs(delta.y())) {
m_gradient_start.value().set_x(m_gradient_center.value().x());
m_gradient_end.value().set_x(m_gradient_center.value().x());
} else {
m_gradient_start.value().set_y(m_gradient_center.value().y());
m_gradient_end.value().set_y(m_gradient_center.value().y());
}
}
calculate_gradient_lines();
}
void GradientTool::on_mouseup(Layer*, MouseEvent& event)
{
auto& layer_event = event.layer_event();
if (layer_event.button() != GUI::MouseButton::Primary && layer_event.button() != GUI::MouseButton::Secondary)
return;
m_button_pressed = false;
m_editor->update_tool_cursor();
}
bool GradientTool::on_keydown(GUI::KeyEvent& event)
{
if (event.key() == Key_LeftShift || event.key() == Key_RightShift) {
m_shift_pressed = true;
if (m_button_pressed)
m_editor->update();
return true;
}
if (event.key() == Key_Return) {
rasterize_gradient();
return true;
}
if (event.key() == Key_Escape) {
reset();
return true;
}
return Tool::on_keydown(event);
}
void GradientTool::on_keyup(GUI::KeyEvent& event)
{
Tool::on_keydown(event);
if (event.key() == Key_Shift) {
m_shift_pressed = false;
event.accept();
}
}
void GradientTool::on_second_paint(Layer const* layer, GUI::PaintEvent& event)
{
if (!layer || !has_gradient_data())
return;
GUI::Painter painter(*m_editor);
painter.add_clip_rect(event.rect());
auto gradient_clip_rect = m_editor->content_to_frame_rect(layer->relative_rect()).to_type<int>().intersected(m_editor->content_rect());
draw_gradient(painter, true, m_editor->content_to_frame_position(layer->location()), m_editor->scale(), gradient_clip_rect);
}
void GradientTool::on_primary_color_change(Color)
{
if (has_gradient_data())
m_editor->update();
}
void GradientTool::on_secondary_color_change(Color)
{
if (has_gradient_data())
m_editor->update();
}
void GradientTool::on_tool_activation()
{
reset();
}
NonnullRefPtr<GUI::Widget> GradientTool::get_properties_widget()
{
if (!m_properties_widget) {
auto properties_widget = GUI::Widget::construct();
properties_widget->set_layout<GUI::VerticalBoxLayout>();
auto& mode_container = properties_widget->add<GUI::Widget>();
mode_container.set_fixed_height(20);
mode_container.set_layout<GUI::HorizontalBoxLayout>();
auto& mode_label = mode_container.add<GUI::Label>("Gradient Type:"_string);
mode_label.set_text_alignment(Gfx::TextAlignment::CenterLeft);
mode_label.set_fixed_size(80, 20);
static constexpr auto s_mode_names = [] {
Array<StringView, (int)GradientMode::__Count> names;
for (size_t i = 0; i < names.size(); i++) {
switch ((GradientMode)i) {
case GradientMode::Linear:
names[i] = "Linear"sv;
break;
case GradientMode::Radial:
names[i] = "Radial"sv;
break;
default:
break;
}
}
return names;
}();
auto& mode_combobox = mode_container.add<GUI::ComboBox>();
mode_combobox.set_only_allow_values_from_model(true);
mode_combobox.set_model(*GUI::ItemListModel<StringView, decltype(s_mode_names)>::create(s_mode_names));
mode_combobox.set_selected_index((int)m_mode, GUI::AllowCallback::No);
auto& opacity_container = properties_widget->add<GUI::Widget>();
opacity_container.set_fixed_height(20);
opacity_container.set_layout<GUI::HorizontalBoxLayout>();
auto& opacity_label = opacity_container.add<GUI::Label>("Opacity:"_string);
opacity_label.set_text_alignment(Gfx::TextAlignment::CenterLeft);
opacity_label.set_fixed_size(80, 20);
auto& opacity_slider = opacity_container.add<GUI::HorizontalOpacitySlider>();
opacity_slider.set_range(1, 100);
opacity_slider.set_value(100);
opacity_slider.on_change = [this](int value) {
m_opacity = value;
m_editor->update();
};
set_primary_slider(&opacity_slider);
auto& hardness_container = properties_widget->add<GUI::Widget>();
hardness_container.set_layout<GUI::HorizontalBoxLayout>();
hardness_container.set_fixed_height(20);
hardness_container.set_visible(m_mode == GradientMode::Radial);
mode_combobox.on_change = [this, &hardness_container](auto&, auto& model_index) {
VERIFY(model_index.row() >= 0);
VERIFY(model_index.row() < (int)GradientMode::__Count);
GradientMode selected_mode = model_index.row() == 0 ? GradientMode::Linear : GradientMode::Radial;
if (m_mode != selected_mode) {
m_mode = selected_mode;
reset();
}
hardness_container.set_visible(m_mode == GradientMode::Radial);
};
auto& hardness_label = hardness_container.add<GUI::Label>("Hardness:"_string);
hardness_label.set_text_alignment(Gfx::TextAlignment::CenterLeft);
hardness_label.set_fixed_size(80, 20);
auto& hardness_slider = hardness_container.add<GUI::ValueSlider>(Orientation::Horizontal, "%"_string);
hardness_slider.set_range(1, 99);
hardness_slider.set_value(m_hardness);
hardness_slider.on_change = [this](int value) {
if (m_mode == GradientMode::Radial && m_editor) {
m_hardness = value;
m_editor->update();
}
};
set_secondary_slider(&hardness_slider);
auto& use_secondary_color_checkbox = properties_widget->add<GUI::CheckBox>("Use secondary color"_string);
use_secondary_color_checkbox.on_checked = [this](bool checked) {
m_use_secondary_color = checked;
m_editor->update();
};
auto& button_container = properties_widget->add<GUI::Widget>();
button_container.set_fixed_height(22);
button_container.set_layout<GUI::HorizontalBoxLayout>();
button_container.add_spacer();
auto& apply_button = button_container.add<GUI::DialogButton>("Apply"_string);
apply_button.on_click = [this](auto) {
rasterize_gradient();
};
m_properties_widget = properties_widget;
}
return *m_properties_widget;
}
void GradientTool::rasterize_gradient()
{
auto layer = m_editor->active_layer();
if (!layer || !has_gradient_data())
return;
GUI::Painter painter(layer->get_scratch_edited_bitmap());
draw_gradient(painter);
layer->did_modify_bitmap(layer->get_scratch_edited_bitmap().rect());
m_editor->did_complete_action(tool_name());
reset();
}
void GradientTool::calculate_gradient_lines()
{
m_gradient_half_length = m_gradient_end.value().distance_from(m_gradient_center.value());
// Create a perpendicular point between the center and end point.
m_perpendicular_point = m_gradient_end.value();
m_perpendicular_point -= m_gradient_center.value();
m_perpendicular_point = { -m_perpendicular_point.y(), m_perpendicular_point.x() };
m_perpendicular_point += m_gradient_center.value();
auto to_edge_scale_direction = (m_physical_diagonal_layer_length * 2) / m_gradient_center.value().distance_from(m_perpendicular_point);
m_gradient_center_line.set_a({ m_gradient_center.value().x() + (to_edge_scale_direction * (m_gradient_center.value().x() - m_perpendicular_point.x())), m_gradient_center.value().y() + (to_edge_scale_direction * (m_gradient_center.value().y() - m_perpendicular_point.y())) });
m_gradient_center_line.set_b({ m_gradient_center.value().x() + (-to_edge_scale_direction * (m_gradient_center.value().x() - m_perpendicular_point.x())), m_gradient_center.value().y() + (-to_edge_scale_direction * (m_gradient_center.value().y() - m_perpendicular_point.y())) });
m_gradient_begin_line.set_a(m_gradient_center_line.a().translated(static_cast<Gfx::FloatPoint>(m_gradient_end.value() - m_gradient_center.value())));
m_gradient_begin_line.set_b(m_gradient_center_line.b().translated(static_cast<Gfx::FloatPoint>(m_gradient_end.value() - m_gradient_center.value())));
m_gradient_end_line.set_a(m_gradient_center_line.a().translated(static_cast<Gfx::FloatPoint>(m_gradient_center.value() - m_gradient_end.value())));
m_gradient_end_line.set_b(m_gradient_center_line.b().translated(static_cast<Gfx::FloatPoint>(m_gradient_center.value() - m_gradient_end.value())));
m_editor->update();
}
void GradientTool::draw_gradient(GUI::Painter& painter, bool with_guidelines, const Gfx::FloatPoint drawing_offset, float scale, Optional<Gfx::IntRect const&> gradient_clip)
{
auto t_gradient_begin_line = m_gradient_begin_line.scaled(scale, scale).translated(drawing_offset);
auto t_gradient_center_line = m_gradient_center_line.scaled(scale, scale).translated(drawing_offset);
auto t_gradient_end_line = m_gradient_end_line.scaled(scale, scale).translated(drawing_offset);
auto t_gradient_center = m_gradient_center.value().to_type<float>().scaled(scale, scale).translated(drawing_offset).to_type<int>();
int width = m_editor->active_layer()->rect().width() * scale;
int height = m_editor->active_layer()->rect().height() * scale;
float rotation_radians = atan2f(t_gradient_begin_line.a().y() - t_gradient_end_line.a().y(), t_gradient_begin_line.a().x() - t_gradient_end_line.a().x());
float rotation_degrees = AK::to_degrees(rotation_radians);
auto determine_required_side_length = [&](int center, int side_length) {
if (center < 0)
return 2 * (AK::abs(center) + side_length);
if (center > side_length)
return 2 * center;
return 2 * (AK::max(center + side_length, side_length - center));
};
auto scaled_gradient_center = m_gradient_center.value().to_type<float>().scaled(scale, scale).to_type<int>();
auto gradient_rect_height = determine_required_side_length(t_gradient_center.y(), height);
auto gradient_rect_width = determine_required_side_length(t_gradient_center.x(), width);
auto gradient_max_side_length = AK::max(gradient_rect_height, gradient_rect_width);
auto gradient_rect = Gfx::IntRect::centered_at(t_gradient_center, { gradient_max_side_length, gradient_max_side_length });
float overall_gradient_length_in_rect = Gfx::calculate_gradient_length(gradient_rect.size().to_type<float>(), rotation_degrees - 90);
if (m_gradient_half_length == 0 || overall_gradient_length_in_rect == 0 || isnan(overall_gradient_length_in_rect))
return;
auto gradient_half_width_percentage_offset = (m_gradient_half_length * scale) / overall_gradient_length_in_rect;
auto start_color = m_editor->color_for(GUI::MouseButton::Primary);
start_color.set_alpha(start_color.alpha() * m_opacity / 100);
auto end_color = [&] {
if (m_use_secondary_color) {
auto color = m_editor->color_for(GUI::MouseButton::Secondary);
return color.with_alpha(color.alpha() * m_opacity / 100);
}
return start_color.with_alpha(0);
}();
{
Gfx::PainterStateSaver saver(painter);
if (gradient_clip.has_value())
painter.add_clip_rect(*gradient_clip);
switch (m_mode) {
case GradientMode::__Count:
break;
case GradientMode::Linear:
painter.fill_rect_with_linear_gradient(gradient_rect, Array { Gfx::ColorStop { start_color, 0.5f - gradient_half_width_percentage_offset }, Gfx::ColorStop { end_color, 0.5f + gradient_half_width_percentage_offset } }, rotation_degrees - 90);
break;
case GradientMode::Radial:
auto t_gradient_longitudinal = m_gradient_start.value().to_type<float>().scaled(scale, scale).translated(drawing_offset).to_type<int>();
auto t_gradient_transversal = m_gradient_transversal_a.value().to_type<float>().scaled(scale, scale).translated(drawing_offset).to_type<int>();
auto radial_size = Gfx::IntSize((AK::abs(t_gradient_center.distance_from(t_gradient_longitudinal))), (AK::abs(t_gradient_center.distance_from(t_gradient_transversal))));
AK::Array<Gfx::ColorStop, 3> colors = {
Gfx::ColorStop { .color = start_color, .position = 0.0f },
Gfx::ColorStop { .color = start_color, .position = m_hardness / 100.0f },
Gfx::ColorStop { .color = end_color, .position = 1.0f },
};
painter.fill_rect_with_radial_gradient(Gfx::IntRect(drawing_offset, { width, height }), colors, scaled_gradient_center, radial_size, {}, 180 - rotation_degrees);
break;
}
}
if (with_guidelines) {
Gfx::AntiAliasingPainter aa_painter = Gfx::AntiAliasingPainter(painter);
Gfx::FloatLine icon_line1_rotated_offset = Gfx::FloatLine({ -2, -4 }, { -2, 4 }).rotated(rotation_radians);
Gfx::FloatLine icon_line2_rotated_offset = Gfx::FloatLine({ 2, -4 }, { 2, 4 }).rotated(rotation_radians);
Gfx::FloatLine icon_line3_rotated_offset = Gfx::FloatLine({ -3, -2 }, { -3, 2 }).rotated(rotation_radians);
Gfx::FloatLine icon_line4_rotated_offset = Gfx::FloatLine({ 3, -2 }, { 3, 2 }).rotated(rotation_radians);
Gfx::FloatLine icon_line5_rotated_offset = Gfx::FloatLine({ 0, -5 }, { 0, 5 }).rotated(rotation_radians);
auto draw_handle = [&](Gfx::IntPoint p, bool is_hovered, IconStyle with_icon) {
auto alpha = is_hovered ? 255 : 100;
auto translated_p = p.to_type<float>().scaled(scale, scale).translated(drawing_offset);
aa_painter.fill_circle(translated_p.to_type<int>(), 10, Color(Color::MidGray).with_alpha(alpha));
aa_painter.fill_circle(translated_p.to_type<int>(), 8, Color(Color::LightGray).with_alpha(alpha));
if (with_icon == IconStyle::ChangeWidthAndAngle) {
aa_painter.draw_line(icon_line1_rotated_offset.translated(translated_p), Color(Color::MidGray).with_alpha(alpha), 2);
aa_painter.draw_line(icon_line2_rotated_offset.translated(translated_p), Color(Color::MidGray).with_alpha(alpha), 2);
}
if (with_icon == IconStyle::RadialWidth) {
auto make_triangle_path = [&](Gfx::FloatPoint p1, Gfx::FloatPoint p2, Gfx::FloatPoint p3) {
Gfx::Path triangle;
triangle.move_to(p1.translated(translated_p));
triangle.line_to(p2.translated(translated_p));
triangle.line_to(p3.translated(translated_p));
triangle.close();
return triangle;
};
aa_painter.fill_path(make_triangle_path(
icon_line3_rotated_offset.a(),
icon_line4_rotated_offset.a(),
icon_line5_rotated_offset.a()),
Color(Color::MidGray).with_alpha(alpha), Gfx::Painter::WindingRule::EvenOdd);
aa_painter.fill_path(make_triangle_path(
icon_line3_rotated_offset.b(),
icon_line4_rotated_offset.b(),
icon_line5_rotated_offset.b()),
Color(Color::MidGray).with_alpha(alpha), Gfx::Painter::WindingRule::EvenOdd);
}
};
if (m_mode == GradientMode::Linear) {
aa_painter.draw_line(t_gradient_begin_line, Color::Black);
aa_painter.draw_line(t_gradient_center_line, Color::MidGray);
aa_painter.draw_line(t_gradient_end_line, Color::LightGray);
} else {
draw_handle(m_gradient_transversal_a.value(), m_hover_over_transversal_a_handle, IconStyle::RadialWidth);
draw_handle(m_gradient_transversal_b.value(), m_hover_over_transversal_b_handle, IconStyle::RadialWidth);
}
draw_handle(m_gradient_start.value(), m_hover_over_start_handle, IconStyle::ChangeWidthAndAngle);
draw_handle(m_gradient_center.value(), m_hover_over_drag_handle, IconStyle::None);
draw_handle(m_gradient_end.value(), m_hover_over_end_handle, IconStyle::ChangeWidthAndAngle);
}
}
void GradientTool::reset()
{
m_gradient_start = {};
m_gradient_center = {};
m_gradient_end = {};
m_gradient_transversal_a = {};
m_gradient_transversal_b = {};
m_gradient_half_length = 0;
m_physical_diagonal_layer_length = 0;
m_hover_over_drag_handle = false;
m_hover_over_start_handle = false;
m_hover_over_end_handle = false;
m_hover_over_transversal_a_handle = false;
m_hover_over_transversal_b_handle = false;
if (m_editor) {
m_editor->update();
m_editor->update_tool_cursor();
}
}
void GradientTool::update_gradient_with_initial_values(Gfx::IntPoint const new_end_point)
{
VERIFY(m_gradient_center.has_value());
m_gradient_end = new_end_point;
auto deltaCenter = m_gradient_end.value() - m_gradient_center.value();
m_gradient_start = m_gradient_center.value() - deltaCenter;
if (m_mode == GradientMode::Radial) {
Gfx::IntPoint perpendicularDeltaCenter = { -deltaCenter.y(), deltaCenter.x() };
m_gradient_transversal_a = m_gradient_center.value() + perpendicularDeltaCenter;
m_gradient_transversal_b = m_gradient_center.value() - perpendicularDeltaCenter;
}
}
void GradientTool::move_gradient_position(Gfx::IntPoint const movement_delta)
{
m_gradient_end.value().translate_by(movement_delta);
m_gradient_start.value().translate_by(movement_delta);
if (m_mode == GradientMode::Radial) {
m_gradient_transversal_a.value().translate_by(movement_delta);
m_gradient_transversal_b.value().translate_by(movement_delta);
}
}
void GradientTool::rotate_gradient_points(Gfx::IntPoint const delta)
{
m_gradient_end.value().translate_by(delta);
auto translation_distance_to_center = m_gradient_center.value().distance_from(m_gradient_end.value()) - m_gradient_center.value().distance_from(m_gradient_start.value());
m_gradient_start.value().translate_by(delta.scaled(-1, -1));
if (m_mode == GradientMode::Radial) {
auto new_horizontal_distance_fraction = (translation_distance_to_center + m_gradient_center.value().distance_from(m_gradient_transversal_a.value())) / m_gradient_center.value().distance_from(m_gradient_start.value());
calculate_transversal_points(new_horizontal_distance_fraction);
}
}
void GradientTool::calculate_transversal_points(float scale_fraction)
{
m_gradient_transversal_a = Gfx::IntPoint(m_gradient_center.value().x() + (scale_fraction * (m_gradient_center.value().x() - m_perpendicular_point.x())),
m_gradient_center.value().y() + (scale_fraction * (m_gradient_center.value().y() - m_perpendicular_point.y())));
m_gradient_transversal_b = Gfx::IntPoint(m_gradient_center.value().x() + (-scale_fraction * (m_gradient_center.value().x() - m_perpendicular_point.x())),
m_gradient_center.value().y() + (-scale_fraction * (m_gradient_center.value().y() - m_perpendicular_point.y())));
}
}
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