#ifndef BWIDGETS_MATH_HPP #define BWIDGETS_MATH_HPP #include #include #include #include #include #include namespace bwidgets { // NOLINTNEXTLINE(clang-diagnostic-unused-function) [[nodiscard]] static inline auto center_line(int available_len, int used_len) noexcept -> int { return (available_len - used_len) / 2; } [[nodiscard]] static inline auto distance_sqrd(const SDL_Point& a, const SDL_Point& b) noexcept -> float { // NOLINTNEXTLINE(bugprone-narrowing-conversions) return (a.x - b.x) * (a.x - b.x) + (a.y - b.y) * (a.y - b.y); } // NOLINTNEXTLINE(clang-diagnostic-unused-function) [[nodiscard]] static inline auto distance(const SDL_Point& a, const SDL_Point& b) noexcept -> float { return std::sqrt(distance_sqrd(a, b)); } template [[nodiscard]] static inline auto lerp(const Color& a, const Color& b, F x, bool op_alpha=false, bool op_color=true) -> Color { return {{ op_color ? (uint8_t)std::lerp(a().r, b().r, x) : a().r, op_color ? (uint8_t)std::lerp(a().g, b().g, x) : a().g, op_color ? (uint8_t)std::lerp(a().b, b().b, x) : a().b, op_alpha ? (uint8_t)std::lerp(a().a, b().a, x) : a().a, }}; } template [[nodiscard]] static inline auto linear(N x, N a, N b) noexcept -> float { return (float)(x - a) / (float)(b - a); } // NOLINTNEXTLINE(clang-diagnostic-unused-function) [[nodiscard]] static inline auto rect_in_rect(const SDL_Rect outer, const SDL_Rect inner) noexcept -> bool { SDL_Point top_left {inner.x, inner.y}; SDL_Point bottom_right {inner.x + inner.w, inner.y + inner.h}; return (SDL_PointInRect(&top_left, &outer) == SDL_TRUE) && (SDL_PointInRect(&bottom_right, &outer) == SDL_TRUE); } // NOLINTNEXTLINE(clang-diagnostic-unused-function) [[nodiscard]] static inline auto rect_margin(const SDL_Rect& r, const Size& margin) noexcept -> SDL_Rect { return {r.x + margin.w, r.y + margin.h, r.w - 2 * margin.w, r.h - 2 * margin.h}; } [[nodiscard]] static inline auto rect_offset(const SDL_Rect& r, const SDL_Point& offset) noexcept -> SDL_Rect { return {r.x + offset.x, r.y + offset.y, r.w, r.h}; } // NOLINTNEXTLINE(clang-diagnostic-unused-function) [[nodiscard]] static inline auto rect_offset(const SDL_Rect& r, const SDL_Rect& offset) noexcept -> SDL_Rect { return rect_offset(r, SDL_Point {offset.x, offset.y}); } template [[nodiscard]] static inline auto smoothstep(N x, N a, N b) noexcept -> float { const float x_norm = linear(std::clamp(x, a, b), a, b); return 3 * x_norm * x_norm - 2 * x_norm * x_norm * x_norm; } } #endif