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Mandelbrot: Add panning

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Adds the ability to use the middle-mouse click to pan the current view.
This commit is contained in:
sin-ack 2021-08-08 14:01:23 +00:00 • committed by Gunnar Beutner
parent faec8bbe45
commit d28802ad22
1 changed files with 32 additions and 0 deletions
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32
Userland/Demos/Mandelbrot/Mandelbrot.cpp
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@ -51,6 +51,19 @@ public:
calculate();
}
void pan_by(Gfx::IntPoint const& delta)
{
auto relative_width_pixel = (m_x_end - m_x_start) / m_bitmap->width();
auto relative_height_pixel = (m_y_end - m_y_start) / m_bitmap->height();
set_view(
m_x_start - delta.x() * relative_width_pixel,
m_x_end - delta.x() * relative_width_pixel,
m_y_start - delta.y() * relative_height_pixel,
m_y_end - delta.y() * relative_height_pixel);
calculate();
}
double mandelbrot(double px, double py, i32 max_iterations)
{
// Based on https://en.wikipedia.org/wiki/Plotting_algorithms_for_the_Mandelbrot_set
@ -154,6 +167,9 @@ private:
Gfx::IntPoint m_selection_start;
Gfx::IntPoint m_selection_end;
bool m_panning { false };
Gfx::IntPoint m_last_pan_position;
MandelbrotSet m_set;
};
@ -179,6 +195,12 @@ void Mandelbrot::mousedown_event(GUI::MouseEvent& event)
m_dragging = true;
update();
}
} else if (event.button() == GUI::MouseButton::Middle) {
if (!m_panning) {
m_last_pan_position = event.position();
m_panning = true;
update();
}
}
return GUI::Widget::mousedown_event(event);
@ -199,6 +221,13 @@ void Mandelbrot::mousemove_event(GUI::MouseEvent& event)
update();
}
if (m_panning) {
m_set.pan_by(event.position() - m_last_pan_position);
m_last_pan_position = event.position();
update();
}
return GUI::Widget::mousemove_event(event);
}
@ -210,6 +239,9 @@ void Mandelbrot::mouseup_event(GUI::MouseEvent& event)
m_set.zoom(selection);
m_dragging = false;
update();
} else if (event.button() == GUI::MouseButton::Middle) {
m_panning = false;
update();
} else if (event.button() == GUI::MouseButton::Right) {
m_set.reset();
update();