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https://github.com/RGBCube/serenity
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Mandelbrot: Extract zoom() method
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fbdf17ae68
commit
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1 changed files with 34 additions and 23 deletions
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@ -209,6 +209,12 @@ class Mandelbrot : public GUI::Frame {
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void export_image(String const& export_path);
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enum class Zoom {
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In,
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Out,
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};
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void zoom(Zoom in_out, const Gfx::IntPoint& center);
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private:
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virtual void paint_event(GUI::PaintEvent&) override;
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virtual void mousedown_event(GUI::MouseEvent& event) override;
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@ -227,6 +233,33 @@ private:
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MandelbrotSet m_set;
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};
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void Mandelbrot::zoom(Zoom in_out, const Gfx::IntPoint& center)
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{
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static constexpr double zoom_in_multiplier = 0.8;
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static constexpr double zoom_out_multiplier = 1.25;
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bool zooming_in = in_out == Zoom::In;
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double multiplier = zooming_in ? zoom_in_multiplier : zoom_out_multiplier;
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auto relative_rect = this->relative_rect();
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Gfx::IntRect zoomed_rect = relative_rect;
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zoomed_rect.set_width(zoomed_rect.width() * multiplier);
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zoomed_rect.set_height(zoomed_rect.height() * multiplier);
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auto leftover_width = abs(relative_rect.width() - zoomed_rect.width());
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auto leftover_height = abs(relative_rect.height() - zoomed_rect.height());
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double cursor_x_percentage = static_cast<double>(center.x()) / relative_rect.width();
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double cursor_y_percentage = static_cast<double>(center.y()) / relative_rect.height();
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zoomed_rect.set_x((zooming_in ? 1 : -1) * leftover_width * cursor_x_percentage);
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zoomed_rect.set_y((zooming_in ? 1 : -1) * leftover_height * cursor_y_percentage);
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m_set.zoom(zoomed_rect);
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update();
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}
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void Mandelbrot::paint_event(GUI::PaintEvent& event)
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{
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Frame::paint_event(event);
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@ -306,29 +339,7 @@ void Mandelbrot::mouseup_event(GUI::MouseEvent& event)
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void Mandelbrot::mousewheel_event(GUI::MouseEvent& event)
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{
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static constexpr double zoom_in_multiplier = 0.8;
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static constexpr double zoom_out_multiplier = 1.25;
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bool zooming_in = event.wheel_delta() < 0;
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double multiplier = zooming_in ? zoom_in_multiplier : zoom_out_multiplier;
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auto relative_rect = this->relative_rect();
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Gfx::IntRect zoomed_rect = relative_rect;
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zoomed_rect.set_width(zoomed_rect.width() * multiplier);
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zoomed_rect.set_height(zoomed_rect.height() * multiplier);
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auto leftover_width = abs(relative_rect.width() - zoomed_rect.width());
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auto leftover_height = abs(relative_rect.height() - zoomed_rect.height());
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double cursor_x_percentage = static_cast<double>(event.position().x()) / relative_rect.width();
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double cursor_y_percentage = static_cast<double>(event.position().y()) / relative_rect.height();
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zoomed_rect.set_x((zooming_in ? 1 : -1) * leftover_width * cursor_x_percentage);
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zoomed_rect.set_y((zooming_in ? 1 : -1) * leftover_height * cursor_y_percentage);
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m_set.zoom(zoomed_rect);
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update();
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zoom(event.wheel_delta() < 0 ? Zoom::In : Zoom::Out, event.position());
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}
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void Mandelbrot::resize_event(GUI::ResizeEvent& event)
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