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https://github.com/SerenityOS/serenity
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PixelPaint: Add a GradientTool
This patch adds a new gradient tool to pixelpaint that allows us to fill the canvas with a smooth color gradient outline at the edge of the filled area.
This commit is contained in:
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commit
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BIN
Base/res/icons/pixelpaint/gradients.png
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Base/res/icons/pixelpaint/gradients.png
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After Width: | Height: | Size: 229 B |
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@ -58,6 +58,7 @@ set(SOURCES
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Tools/EllipseTool.cpp
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Tools/EraseTool.cpp
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Tools/GuideTool.cpp
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Tools/GradientTool.cpp
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Tools/LassoSelectTool.cpp
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Tools/LineTool.cpp
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Tools/MoveTool.cpp
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@ -11,6 +11,7 @@
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#include "Tools/CloneTool.h"
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#include "Tools/EllipseTool.h"
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#include "Tools/EraseTool.h"
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#include "Tools/GradientTool.h"
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#include "Tools/GuideTool.h"
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#include "Tools/LassoSelectTool.h"
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#include "Tools/LineTool.h"
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@ -96,6 +97,7 @@ void ToolboxWidget::setup_tools()
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add_tool("lasso-select"sv, { 0, Key_L }, make<LassoSelectTool>());
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add_tool("guides"sv, { 0, Key_G }, make<GuideTool>());
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add_tool("clone"sv, { 0, Key_C }, make<CloneTool>());
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add_tool("gradients"sv, { Mod_Ctrl, Key_G }, make<GradientTool>());
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}
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}
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352
Userland/Applications/PixelPaint/Tools/GradientTool.cpp
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352
Userland/Applications/PixelPaint/Tools/GradientTool.cpp
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@ -0,0 +1,352 @@
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/*
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* Copyright (c) 2023, Torsten Engelmann <engelTorsten@gmx.de>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include "GradientTool.h"
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#include "../ImageEditor.h"
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#include "../Layer.h"
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#include <LibGUI/Action.h>
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#include <LibGUI/Application.h>
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#include <LibGUI/BoxLayout.h>
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#include <LibGUI/Button.h>
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#include <LibGUI/Label.h>
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#include <LibGUI/OpacitySlider.h>
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#include <LibGUI/Painter.h>
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#include <LibGfx/AntiAliasingPainter.h>
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#include <LibGfx/Color.h>
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#include <LibGfx/Gradients.h>
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#include <LibGfx/Path.h>
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#include <LibGfx/Rect.h>
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namespace PixelPaint {
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Variant<Gfx::StandardCursor, NonnullRefPtr<Gfx::Bitmap>> GradientTool::cursor()
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{
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if (m_hover_over_drag_handle || m_hover_over_start_handle || m_hover_over_end_handle)
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return Gfx::StandardCursor::Hand;
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if (m_button_pressed)
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return Gfx::StandardCursor::Move;
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return Gfx::StandardCursor::Crosshair;
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}
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void GradientTool::on_mousedown(Layer* layer, MouseEvent& event)
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{
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if (!layer)
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return;
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auto& layer_event = event.layer_event();
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if (layer_event.button() != GUI::MouseButton::Primary && layer_event.button() != GUI::MouseButton::Secondary)
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return;
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m_button_pressed = true;
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if (!m_hover_over_start_handle && !m_hover_over_end_handle) {
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if (has_gradient_start_end()) {
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Gfx::IntPoint movement_delta = layer_event.position() - m_gradient_center.value();
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m_gradient_center = layer_event.position();
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translate_gradient_start_end(movement_delta, false);
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calculate_gradient_lines();
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} else {
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m_gradient_center = layer_event.position();
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}
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}
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m_physical_diagonal_layer_length = Gfx::IntPoint(0, 0).distance_from({ layer->rect().width(), layer->rect().height() });
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m_editor->update_tool_cursor();
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}
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void GradientTool::on_mousemove(Layer* layer, MouseEvent& event)
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{
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// Check if user is hovering over a handle
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if (layer && m_editor && !m_button_pressed && has_gradient_start_end()) {
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auto set_hover_flag = [&](bool& flag, const Gfx::IntPoint p) {
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auto frame_postion = m_editor->content_to_frame_position(p).to_type<int>();
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auto handle = Gfx::IntRect::centered_at(frame_postion, { 16, 16 });
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if (flag != handle.contains(event.raw_event().position())) {
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flag = !flag;
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m_editor->update_tool_cursor();
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m_editor->update();
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}
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};
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set_hover_flag(m_hover_over_start_handle, m_gradient_start.value());
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set_hover_flag(m_hover_over_drag_handle, m_gradient_center.value());
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set_hover_flag(m_hover_over_end_handle, m_gradient_end.value());
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}
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if (!layer || !m_button_pressed)
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return;
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auto& layer_event = event.layer_event();
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if (!m_hover_over_drag_handle && (m_hover_over_start_handle || m_hover_over_end_handle)) {
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auto movement_delta = m_hover_over_start_handle ? layer_event.position() - m_gradient_start.value() : layer_event.position() - m_gradient_end.value();
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translate_gradient_start_end(m_hover_over_start_handle ? movement_delta.scaled({ -1, -1 }) : movement_delta);
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}
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if (m_hover_over_drag_handle) {
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auto movement_delta = layer_event.position() - m_gradient_center.value();
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m_gradient_center.value().translate_by(movement_delta);
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translate_gradient_start_end(movement_delta, false);
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}
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if (!(m_hover_over_drag_handle || m_hover_over_start_handle || m_hover_over_end_handle))
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update_gradient_end_and_derive_start(layer_event.position());
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// If Shift is pressed, align the gradient horizontally or vertically
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if (m_shift_pressed && has_gradient_start_end()) {
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auto delta = m_gradient_center.value() - m_gradient_end.value();
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if (AK::abs(delta.x()) < AK::abs(delta.y())) {
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m_gradient_start.value().set_x(m_gradient_center.value().x());
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m_gradient_end.value().set_x(m_gradient_center.value().x());
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} else {
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m_gradient_start.value().set_y(m_gradient_center.value().y());
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m_gradient_end.value().set_y(m_gradient_center.value().y());
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}
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}
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calculate_gradient_lines();
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}
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void GradientTool::on_mouseup(Layer*, MouseEvent& event)
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{
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auto& layer_event = event.layer_event();
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if (layer_event.button() != GUI::MouseButton::Primary && layer_event.button() != GUI::MouseButton::Secondary)
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return;
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m_button_pressed = false;
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m_editor->update_tool_cursor();
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}
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bool GradientTool::on_keydown(GUI::KeyEvent& event)
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{
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if (event.key() == Key_LeftShift || event.key() == Key_RightShift) {
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m_shift_pressed = true;
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if (m_button_pressed)
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m_editor->update();
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return true;
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}
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if (event.key() == Key_Return) {
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rasterize_gradient();
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return true;
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}
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if (event.key() == Key_Escape) {
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reset();
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return true;
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}
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return Tool::on_keydown(event);
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}
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void GradientTool::on_keyup(GUI::KeyEvent& event)
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{
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Tool::on_keydown(event);
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if (event.key() == Key_Shift) {
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m_shift_pressed = false;
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event.accept();
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}
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}
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void GradientTool::on_second_paint(Layer const* layer, GUI::PaintEvent&)
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{
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if (!layer || !has_gradient_start_end())
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return;
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// FIXME: Clipping still does overwrite the ruler if we are zoomed in.
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auto clipping_rect = m_editor->rect().contains(m_editor->content_rect()) ? m_editor->content_rect() : m_editor->rect();
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GUI::Painter painter(*m_editor);
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painter.add_clip_rect(clipping_rect);
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draw_gradient(painter, true, m_editor->content_to_frame_position(Gfx::IntPoint(0, 0)), m_editor->scale());
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}
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void GradientTool::on_tool_activation()
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{
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m_editor->on_primary_color_change = [this](Color) {
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if (m_gradient_end.has_value())
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m_editor->update();
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};
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reset();
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}
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GUI::Widget* GradientTool::get_properties_widget()
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{
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if (!m_properties_widget) {
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m_properties_widget = GUI::Widget::construct();
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m_properties_widget->set_layout<GUI::VerticalBoxLayout>();
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auto& size_container = m_properties_widget->add<GUI::Widget>();
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size_container.set_fixed_height(20);
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size_container.set_layout<GUI::HorizontalBoxLayout>();
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auto& size_label = size_container.add<GUI::Label>("Opacity:");
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size_label.set_text_alignment(Gfx::TextAlignment::CenterLeft);
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size_label.set_fixed_size(80, 20);
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auto& opacity_slider = size_container.add<GUI::HorizontalOpacitySlider>();
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opacity_slider.set_range(1, 100);
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opacity_slider.set_value(100);
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opacity_slider.on_change = [&](int value) {
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m_opacity = value;
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m_editor->update();
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};
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set_primary_slider(&opacity_slider);
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auto& button_container = m_properties_widget->add<GUI::Widget>();
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button_container.set_fixed_height(22);
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auto& button_container_layout = button_container.set_layout<GUI::HorizontalBoxLayout>();
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button_container_layout.add_spacer();
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auto& apply_button = button_container.add<GUI::DialogButton>("Apply");
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apply_button.on_click = [this](auto) {
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rasterize_gradient();
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};
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}
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return m_properties_widget.ptr();
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}
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void GradientTool::rasterize_gradient()
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{
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if (!has_gradient_start_end())
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return;
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GUI::Painter painter(m_editor->active_layer()->get_scratch_edited_bitmap());
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draw_gradient(painter);
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m_editor->did_complete_action("Gradient Tool"sv);
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reset();
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}
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void GradientTool::calculate_gradient_lines()
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{
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m_gradient_half_length = m_gradient_end.value().distance_from(m_gradient_center.value());
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// Create a perpendicular point between the center and end point.
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m_perpendicular_point = m_gradient_end.value();
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m_perpendicular_point -= m_gradient_center.value();
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m_perpendicular_point = { -m_perpendicular_point.y(), m_perpendicular_point.x() };
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m_perpendicular_point += m_gradient_center.value();
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auto to_edge_scale_direction = (m_physical_diagonal_layer_length * 2) / m_gradient_center.value().distance_from(m_perpendicular_point);
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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())) });
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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())) });
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m_gradient_begin_line.set_a(m_gradient_center_line.a().translated(static_cast<Gfx::FloatPoint>(m_gradient_end.value() - m_gradient_center.value())));
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m_gradient_begin_line.set_b(m_gradient_center_line.b().translated(static_cast<Gfx::FloatPoint>(m_gradient_end.value() - m_gradient_center.value())));
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m_gradient_end_line.set_a(m_gradient_center_line.a().translated(static_cast<Gfx::FloatPoint>(m_gradient_center.value() - m_gradient_end.value())));
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m_gradient_end_line.set_b(m_gradient_center_line.b().translated(static_cast<Gfx::FloatPoint>(m_gradient_center.value() - m_gradient_end.value())));
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m_editor->update();
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}
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void GradientTool::draw_gradient(GUI::Painter& painter, bool with_guidelines, const Gfx::FloatPoint drawing_offset, float scale)
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{
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auto t_gradient_begin_line = m_gradient_begin_line.scaled(scale, scale).translated(drawing_offset);
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auto t_gradient_center_line = m_gradient_center_line.scaled(scale, scale).translated(drawing_offset);
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auto t_gradient_end_line = m_gradient_end_line.scaled(scale, scale).translated(drawing_offset);
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auto t_gradient_center = m_gradient_center.value().to_type<float>().scaled(scale, scale).translated(drawing_offset).to_type<int>();
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int width = m_editor->active_layer()->rect().width() * scale;
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int height = m_editor->active_layer()->rect().height() * scale;
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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());
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float rotation_degrees = ((rotation_radians * 180) / static_cast<float>(M_PI)) - 90;
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auto determine_required_side_length = [&](int center, int side_length) {
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if (center < 0)
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return 2 * (AK::abs(center) + side_length);
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if (center > side_length)
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return 2 * center;
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return 2 * (AK::max(center, side_length - center));
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};
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auto scaled_gradient_center = m_gradient_center.value().to_type<float>().scaled(scale, scale).to_type<int>();
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auto gradient_rect_height = determine_required_side_length(scaled_gradient_center.y(), height);
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auto gradient_rect_width = determine_required_side_length(scaled_gradient_center.x(), width);
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auto gradient_max_side_length = AK::max(gradient_rect_height, gradient_rect_width);
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auto gradient_rect = Gfx::IntRect::centered_at(t_gradient_center, { gradient_max_side_length, gradient_max_side_length });
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float overall_gradient_length_in_rect = Gfx::calculate_gradient_length(gradient_rect.size(), rotation_degrees);
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if (m_gradient_half_length == 0 || overall_gradient_length_in_rect == 0 || isnan(overall_gradient_length_in_rect))
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return;
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auto gradient_half_width_percentage_offset = (m_gradient_half_length * scale) / overall_gradient_length_in_rect;
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auto color_to_use = m_editor->color_for(GUI::MouseButton::Primary);
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int base_opacity = color_to_use.alpha() * m_opacity / 100;
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color_to_use.set_alpha(base_opacity);
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auto gradient_start_color = color_to_use;
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gradient_start_color.set_alpha(0);
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painter.fill_rect_with_linear_gradient(gradient_rect, Array { Gfx::ColorStop { gradient_start_color, 0.5f - gradient_half_width_percentage_offset }, Gfx::ColorStop { color_to_use, 0.5f + gradient_half_width_percentage_offset } }, rotation_degrees);
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if (with_guidelines) {
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Gfx::AntiAliasingPainter aa_painter = Gfx::AntiAliasingPainter(painter);
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aa_painter.draw_line(t_gradient_begin_line, Color::LightGray);
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aa_painter.draw_line(t_gradient_center_line, Color::MidGray);
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aa_painter.draw_line(t_gradient_end_line, Color::Black);
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Gfx::FloatLine icon_line1_rotated_offset = Gfx::FloatLine({ -2, -4 }, { -2, 4 }).rotated(rotation_radians);
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Gfx::FloatLine icon_line2_rotated_offset = Gfx::FloatLine({ 2, -4 }, { 2, 4 }).rotated(rotation_radians);
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auto draw_handle = [&](Gfx::IntPoint p, bool is_hovered, bool with_icon) {
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auto alpha = is_hovered ? 255 : 100;
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auto translated_p = p.to_type<float>().scaled(scale, scale).translated(drawing_offset);
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aa_painter.fill_circle(translated_p.to_type<int>(), 10, Color(Color::MidGray).with_alpha(alpha));
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aa_painter.fill_circle(translated_p.to_type<int>(), 8, Color(Color::LightGray).with_alpha(alpha));
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if (with_icon) {
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aa_painter.draw_line(icon_line1_rotated_offset.translated(translated_p), Color(Color::MidGray).with_alpha(alpha), 2);
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aa_painter.draw_line(icon_line2_rotated_offset.translated(translated_p), Color(Color::MidGray).with_alpha(alpha), 2);
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}
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};
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draw_handle(m_gradient_start.value(), m_hover_over_start_handle, true);
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draw_handle(m_gradient_center.value(), m_hover_over_drag_handle, false);
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draw_handle(m_gradient_end.value(), m_hover_over_end_handle, true);
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}
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}
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void GradientTool::reset()
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{
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m_gradient_start = {};
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m_gradient_center = {};
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m_gradient_end = {};
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m_gradient_half_length = 0;
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m_physical_diagonal_layer_length = 0;
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m_hover_over_drag_handle = false;
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m_hover_over_start_handle = false;
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m_hover_over_end_handle = false;
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if (m_editor) {
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m_editor->update();
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m_editor->update_tool_cursor();
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}
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}
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void GradientTool::update_gradient_end_and_derive_start(Gfx::IntPoint const new_end_point)
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{
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VERIFY(m_gradient_center.has_value());
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m_gradient_end = new_end_point;
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m_gradient_start = m_gradient_center.value() - (m_gradient_end.value() - m_gradient_center.value());
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}
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void GradientTool::translate_gradient_start_end(Gfx::IntPoint const delta, bool update_start_counterwise)
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{
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m_gradient_end.value().translate_by(delta);
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if (update_start_counterwise)
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m_gradient_start.value().translate_by(delta.scaled(-1, -1));
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else
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m_gradient_start.value().translate_by(delta);
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}
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}
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60
Userland/Applications/PixelPaint/Tools/GradientTool.h
Normal file
60
Userland/Applications/PixelPaint/Tools/GradientTool.h
Normal file
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/*
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* Copyright (c) 2023, Torsten Engelmann <engelTorsten@gmx.de>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include "../ImageEditor.h"
|
||||
#include "Tool.h"
|
||||
|
||||
namespace PixelPaint {
|
||||
|
||||
class GradientTool : public Tool {
|
||||
public:
|
||||
GradientTool() = default;
|
||||
virtual ~GradientTool() override = default;
|
||||
virtual void on_mousedown(Layer*, MouseEvent&) override;
|
||||
virtual void on_mousemove(Layer*, MouseEvent&) override;
|
||||
virtual void on_mouseup(Layer*, MouseEvent&) override;
|
||||
virtual bool on_keydown(GUI::KeyEvent&) override;
|
||||
virtual void on_keyup(GUI::KeyEvent&) override;
|
||||
virtual void on_tool_activation() override;
|
||||
virtual GUI::Widget* get_properties_widget() override;
|
||||
|
||||
virtual Variant<Gfx::StandardCursor, NonnullRefPtr<Gfx::Bitmap>> cursor() override;
|
||||
virtual void on_second_paint(Layer const*, GUI::PaintEvent&) override;
|
||||
|
||||
protected:
|
||||
virtual StringView tool_name() const override { return "Gradient Tool"sv; }
|
||||
|
||||
private:
|
||||
RefPtr<GUI::Widget> m_properties_widget;
|
||||
Optional<Gfx::IntPoint> m_gradient_start;
|
||||
Optional<Gfx::IntPoint> m_gradient_center;
|
||||
Optional<Gfx::IntPoint> m_gradient_end;
|
||||
Gfx::IntPoint m_perpendicular_point;
|
||||
|
||||
float m_gradient_half_length = 0;
|
||||
float m_physical_diagonal_layer_length = 0;
|
||||
bool m_button_pressed = false;
|
||||
bool m_shift_pressed = false;
|
||||
bool m_hover_over_drag_handle = false;
|
||||
bool m_hover_over_start_handle = false;
|
||||
bool m_hover_over_end_handle = false;
|
||||
int m_opacity = 100;
|
||||
Gfx::FloatLine m_gradient_begin_line;
|
||||
Gfx::FloatLine m_gradient_center_line;
|
||||
Gfx::FloatLine m_gradient_end_line;
|
||||
|
||||
void reset();
|
||||
void draw_gradient(GUI::Painter&, bool with_guidelines = false, const Gfx::FloatPoint drawing_offset = { 0.0f, 0.0f }, float scale = 1);
|
||||
void rasterize_gradient();
|
||||
void calculate_gradient_lines();
|
||||
void update_gradient_end_and_derive_start(Gfx::IntPoint const);
|
||||
void translate_gradient_start_end(Gfx::IntPoint const delta, bool update_start_counterwise = true);
|
||||
bool has_gradient_start_end() { return m_gradient_center.has_value() && m_gradient_end.has_value() && m_gradient_start.has_value(); }
|
||||
};
|
||||
|
||||
}
|
|
@ -92,13 +92,13 @@ protected:
|
|||
|
||||
virtual Gfx::IntPoint editor_stroke_position(Gfx::IntPoint pixel_coords, int stroke_thickness) const;
|
||||
|
||||
void set_primary_slider(GUI::ValueSlider* primary) { m_primary_slider = primary; }
|
||||
void set_secondary_slider(GUI::ValueSlider* secondary) { m_secondary_slider = secondary; }
|
||||
void set_primary_slider(GUI::AbstractSlider* primary) { m_primary_slider = primary; }
|
||||
void set_secondary_slider(GUI::AbstractSlider* secondary) { m_secondary_slider = secondary; }
|
||||
|
||||
static Gfx::IntPoint constrain_line_angle(Gfx::IntPoint start_pos, Gfx::IntPoint end_pos, float angle_increment = M_PI / 8);
|
||||
|
||||
GUI::ValueSlider* m_primary_slider { nullptr };
|
||||
GUI::ValueSlider* m_secondary_slider { nullptr };
|
||||
GUI::AbstractSlider* m_primary_slider { nullptr };
|
||||
GUI::AbstractSlider* m_secondary_slider { nullptr };
|
||||
};
|
||||
|
||||
}
|
||||
|
|
Loading…
Reference in a new issue