PixelPaint: Move Tools to it's own subdirectory

The PixelPaint source directory was getting a bit large, let's move all
the Tools to it's own subdirectory. Also remove some unused includes.

1 files changed, 153 insertions, 0 deletions

diff --git a/Userland/Applications/PixelPaint/Tools/LineTool.cpp b/Userland/Applications/PixelPaint/Tools/LineTool.cpp
new file mode 100644
index 0000000000..3ba9aeed9c
--- /dev/null
+++ b/Userland/Applications/PixelPaint/Tools/LineTool.cpp
@@ -0,0 +1,153 @@
+/*
+ * 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();
+}
+
+}