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Mandelbrot: Only calculate the set in paint event

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The set should be calculated only when there is a paint event to keep
the number of times the set is calculated (which is compute expensive)
to the minimum.
This commit is contained in:
ronak69 2023-10-21 11:30:54 +00:00 • committed by Andreas Kling
parent fa026df892
commit 0f33d2a36d
Notes: sideshowbarker 2024-07-17 08:43:11 +09:00
1 changed files with 7 additions and 7 deletions
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14
Userland/Demos/Mandelbrot/Mandelbrot.cpp
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@ -34,14 +34,12 @@ public:
{
set_view();
correct_aspect();
calculate();
}
void resize(Gfx::IntSize size)
{
m_bitmap = Gfx::Bitmap::create(Gfx::BitmapFormat::BGRx8888, size).release_value_but_fixme_should_propagate_errors();
correct_aspect();
calculate();
}
void zoom(Gfx::IntRect const& rect)
@ -52,7 +50,6 @@ public:
rect.top() * (m_y_end - m_y_start) / m_bitmap->height() + m_y_start,
(rect.bottom() - 1) * (m_y_end - m_y_start) / m_bitmap->height() + m_y_start);
correct_aspect();
calculate();
}
void pan_by(Gfx::IntPoint delta)
@ -289,6 +286,9 @@ void Mandelbrot::paint_event(GUI::PaintEvent& event)
{
Frame::paint_event(event);
if (!m_dragging && !m_panning)
m_set.calculate();
GUI::Painter painter(*this);
painter.add_clip_rect(frame_inner_rect());
painter.add_clip_rect(event.rect());
@ -305,13 +305,11 @@ void Mandelbrot::mousedown_event(GUI::MouseEvent& event)
m_selection_start = event.position();
m_selection_end = event.position();
m_dragging = true;
update();
}
} else if (event.button() == GUI::MouseButton::Middle) {
if (!m_panning) {
m_last_pan_position = event.position();
m_panning = true;
update();
}
}
@ -347,10 +345,11 @@ void Mandelbrot::mouseup_event(GUI::MouseEvent& event)
{
if (event.button() == GUI::MouseButton::Primary) {
auto selection = Gfx::IntRect::from_two_points(m_selection_start, m_selection_end);
if (selection.width() > 0 && selection.height() > 0)
if (selection.width() > 0 && selection.height() > 0) {
m_set.zoom(selection);
update();
}
m_dragging = false;
update();
} else if (event.button() == GUI::MouseButton::Middle) {
m_panning = false;
update();
@ -374,6 +373,7 @@ void Mandelbrot::resize_event(GUI::ResizeEvent& event)
ErrorOr<void> Mandelbrot::export_image(Core::File& export_file, ImageType image_type)
{
m_set.resize(Gfx::IntSize { 1920, 1080 });
m_set.calculate();
ByteBuffer encoded_data;
switch (image_type) {
case ImageType::BMP: