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Mandelbrot: Keep the aspect ratio when (re-)sizing the window

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Previously the initial aspect ratio was incorrect and there was
nothing to ensure that the aspect ratio is kept when resizing the
window.
This commit is contained in:
Gunnar Beutner 2021-05-18 14:33:00 +02:00 committed by Andreas Kling
parent 77bd3f75ce
commit f2f728d39a
Notes: sideshowbarker 2024-07-18 17:52:03 +09:00 
Author: https://github.com/gunnarbeutner
Commit: https://github.com/SerenityOS/serenity/commit/f2f728d39ae
Pull-request: https://github.com/SerenityOS/serenity/pull/7214
Reviewed-by: https://github.com/bgianfo ✅
1 changed files with 13 additions and 3 deletions
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16
Userland/Demos/Mandelbrot/Mandelbrot.cpp
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@ -29,12 +29,14 @@ public:
void reset()
{
set_view();
correct_aspect();
calculate();
}
void resize(Gfx::IntSize const& size)
{
m_bitmap = Gfx::Bitmap::create(Gfx::BitmapFormat::BGRx8888, size);
correct_aspect();
calculate();
}
@ -45,6 +47,7 @@ public:
rect.right() * (m_x_end - m_x_start) / m_bitmap->width() + m_x_start,
rect.top() * (m_y_end - m_y_start) / m_bitmap->height() + m_y_start,
rect.bottom() * (m_y_end - m_y_start) / m_bitmap->height() + m_y_start);
correct_aspect();
calculate();
}
@ -98,8 +101,7 @@ public:
void calculate(int max_iterations = 100)
{
if (!m_bitmap)
return;
VERIFY(m_bitmap);
for (int py = 0; py < m_bitmap->height(); py++)
for (int px = 0; px < m_bitmap->width(); px++)
@ -118,13 +120,21 @@ private:
double m_y_end { 0 };
RefPtr<Gfx::Bitmap> m_bitmap;
void set_view(double x_start = -2.5, double x_end = 1.0, double y_start = -1.0, double y_end = 1.0)
void set_view(double x_start = -2.5, double x_end = 1.0, double y_start = -1.75, double y_end = 1.75)
{
m_x_start = x_start;
m_x_end = x_end;
m_y_start = y_start;
m_y_end = y_end;
}
void correct_aspect()
{
auto y_mid = m_y_start + (m_y_end - m_y_start) / 2;
auto aspect_corrected_y_length = (m_x_end - m_x_start) * m_bitmap->height() / m_bitmap->width();
m_y_start = y_mid - aspect_corrected_y_length / 2;
m_y_end = y_mid + aspect_corrected_y_length / 2;
}
};
class Mandelbrot : public GUI::Widget {