61 lines
1.9 KiB
C++
61 lines
1.9 KiB
C++
#ifndef BWIDGETS_EXAMPLES_EXAMPLE_WIDGET
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#define BWIDGETS_EXAMPLES_EXAMPLE_WIDGET
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#include <chrono>
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#include <basic_widgets/core/math.hpp>
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#include <basic_widgets/core/renderer.hpp>
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#include <basic_widgets/w/base/widget_impl.hpp>
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using bwidgets::Color;
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using bwidgets::rect_margin;
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using bwidgets::Size;
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using bwidgets::WidgetImpl;
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class Example final : public WidgetImpl
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{
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void _handle_geometry_change(const SDL_Rect& vp) noexcept override
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{
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_widget_area = {2, 2, vp.w - 4, vp.h - 4};
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}
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void _handle_rendering() override
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{
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const auto now = std::chrono::duration_cast<std::chrono::milliseconds>(
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std::chrono::steady_clock::now().time_since_epoch())
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.count();
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const uint8_t r = 255 * (now % cycle_r / (float)cycle_r); // NOLINT
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const uint8_t g = 255 * (now % cycle_g / (float)cycle_g); // NOLINT
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const uint8_t b = 255 * (now % cycle_b / (float)cycle_b); // NOLINT
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const Color base_color {r, g, b, SDL_ALPHA_OPAQUE};
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const int border = 10;
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for (auto i = 0; i < border; i += 3) {
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uint8_t alpha = 255 * i / border; // NOLINT(readability-magic-numbers)
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_renderer
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->draw_color({
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{base_color().r, base_color().g, base_color().b, alpha}
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})
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->draw_rect(rect_margin(_widget_area, {i, i}));
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}
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_renderer->draw_color(base_color)
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->draw_rect(nullptr)
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->fill_rect(rect_margin(_widget_area, {border * 2, border * 2}));
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}
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public:
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unsigned int cycle_r {3500}; // NOLINT(readability-magic-numbers)
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unsigned int cycle_g {3500}; // NOLINT(readability-magic-numbers)
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unsigned int cycle_b {3500}; // NOLINT(readability-magic-numbers)
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using WidgetImpl::WidgetImpl;
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[[nodiscard]] auto size() const noexcept -> Size override
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{
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return {128, 64}; // NOLINT(readability-magic-numbers)
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}
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};
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#endif
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