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PixelPaint: Implement basic rectangular selection (preview only)

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Using the rectangle select tool, you can now drag out a selection which
will be drawn in the form of "marching ants" :^)
This commit is contained in:
Andreas Kling 2021-06-14 17:22:45 +02:00
parent 4bd905de0e
commit 96b52f13e4
2 changed files with 82 additions and 4 deletions
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77
Userland/Applications/PixelPaint/RectangleSelectTool.cpp
View file

@ -5,31 +5,100 @@
*/
#include "RectangleSelectTool.h"
#include "Image.h"
#include "ImageEditor.h"
#include "Layer.h"
#include <LibCore/Timer.h>
#include <LibGUI/Painter.h>
namespace PixelPaint {
constexpr int marching_ant_length = 4;
RectangleSelectTool::RectangleSelectTool()
{
m_marching_ants_timer = Core::Timer::create_repeating(80, [this] {
if (!m_editor)
return;
++m_marching_ants_offset;
m_marching_ants_offset %= marching_ant_length;
m_editor->update();
});
m_marching_ants_timer->start();
}
RectangleSelectTool::~RectangleSelectTool()
{
}
void RectangleSelectTool::on_mousedown(Layer&, GUI::MouseEvent&, GUI::MouseEvent&)
void RectangleSelectTool::on_mousedown(Layer&, GUI::MouseEvent&, GUI::MouseEvent& image_event)
{
if (image_event.button() != GUI::MouseButton::Left)
return;
m_selecting = true;
m_selection_start = image_event.position();
m_selection_end = image_event.position();
m_editor->update();
}
void RectangleSelectTool::on_mousemove(Layer&, GUI::MouseEvent&, GUI::MouseEvent&)
void RectangleSelectTool::on_mousemove(Layer&, GUI::MouseEvent&, GUI::MouseEvent& image_event)
{
if (!m_selecting)
return;
m_selection_end = image_event.position();
m_editor->update();
}
void RectangleSelectTool::on_mouseup(Layer&, GUI::MouseEvent&, GUI::MouseEvent&)
void RectangleSelectTool::on_mouseup(Layer&, GUI::MouseEvent&, GUI::MouseEvent& image_event)
{
if (!m_selecting || image_event.button() != GUI::MouseButton::Left)
return;
m_selecting = false;
m_editor->update();
}
void RectangleSelectTool::on_second_paint(Layer const&, GUI::PaintEvent&)
void RectangleSelectTool::draw_marching_ants(Gfx::Painter& painter, Gfx::IntRect const& rect) const
{
int offset = m_marching_ants_offset;
auto draw_pixel = [&](int x, int y) {
if ((offset % marching_ant_length) != 0)
painter.set_pixel(x, y, Color::Black);
offset++;
};
// Top line
for (int x = rect.left(); x <= rect.right(); ++x)
draw_pixel(x, rect.top());
// Right line
for (int y = rect.top() + 1; y <= rect.bottom(); ++y)
draw_pixel(rect.right(), y);
// Bottom line
for (int x = rect.right() - 1; x >= rect.left(); --x)
draw_pixel(x, rect.bottom());
// Left line
for (int y = rect.bottom() - 1; y > rect.top(); --y)
draw_pixel(rect.left(), y);
}
void RectangleSelectTool::on_second_paint(Layer const&, GUI::PaintEvent& event)
{
if (!m_selecting)
return;
GUI::Painter painter(*m_editor);
painter.add_clip_rect(event.rect());
auto rect_in_image = Gfx::IntRect::from_two_points(m_selection_start, m_selection_end);
auto rect_in_editor = m_editor->image_rect_to_editor_rect(rect_in_image);
draw_marching_ants(painter, rect_in_editor.to_type<int>());
}
}