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PixelPaint: Draw the current editor selection as marching ants

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This patch moves the marching ants painting code to Selection and
unifies the timer mechanism so that all marching ants are synchronized
which looks neat. :^)
This commit is contained in:
Andreas Kling 2021-06-14 17:45:59 +02:00
parent 1b897ec561
commit 4cecd79000
5 changed files with 51 additions and 46 deletions
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43
Userland/Applications/PixelPaint/Selection.cpp
View file

@ -10,9 +10,50 @@
namespace PixelPaint {
constexpr int marching_ant_length = 4;
void Selection::paint(Gfx::Painter& painter, ImageEditor const& editor)
{
painter.draw_rect(editor.image_rect_to_editor_rect(m_rect).to_type<int>(), Color::Magenta);
draw_marching_ants(painter, editor.image_rect_to_editor_rect(m_rect).to_type<int>());
}
Selection::Selection(ImageEditor& editor)
: m_editor(editor)
{
m_marching_ants_timer = Core::Timer::create_repeating(80, [this] {
++m_marching_ants_offset;
m_marching_ants_offset %= marching_ant_length;
if (!is_empty())
m_editor.update();
});
m_marching_ants_timer->start();
}
void Selection::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);
}
}