mirror of https://github.com/lefticus/6502-cpp.git
100 lines
3.0 KiB
C++
100 lines
3.0 KiB
C++
#ifndef INC_6502_C_GEOMETRY_HPP
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#define INC_6502_C_GEOMETRY_HPP
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#include <cstdint>
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namespace geometry {
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struct point
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{
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std::uint8_t x;
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std::uint8_t y;
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[[nodiscard]] constexpr auto operator<=>(const point &other) const = default;
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// [[nodiscard]] constexpr bool operator==(const point &other) const = default;
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// [[nodiscard]] constexpr bool operator!=(const point &other) const = default;
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};
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constexpr point operator+(const point &lhs, const point &rhs) noexcept
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{
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return point{ static_cast<std::uint8_t>(lhs.x + rhs.x), static_cast<std::uint8_t>(lhs.y + rhs.y) };
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}
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struct size
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{
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std::uint8_t width;
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std::uint8_t height;
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[[nodiscard]] constexpr bool operator==(const size &other) const = default;
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[[nodiscard]] constexpr bool operator!=(const size &other) const = default;
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};
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struct rect
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{
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[[nodiscard]] constexpr std::uint8_t left() const noexcept { return tl.x; }
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[[nodiscard]] constexpr std::uint8_t top() const noexcept { return tl.y; }
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[[nodiscard]] constexpr std::uint8_t bottom() const noexcept
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{
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return static_cast<std::uint8_t>(tl.y + size_.height - 1);
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}
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[[nodiscard]] constexpr std::uint8_t right() const noexcept
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{
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return static_cast<std::uint8_t>(tl.x + size_.width - 1);
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}
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[[nodiscard]] constexpr const point &top_left() const noexcept { return tl; }
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[[nodiscard]] constexpr point bottom_right() const noexcept { return point{ right(), bottom() }; }
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[[nodiscard]] constexpr point bottom_left() const noexcept { return point{ left(), bottom() }; }
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[[nodiscard]] constexpr point top_right() const noexcept { return point{ right(), top() }; }
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[[nodiscard]] constexpr std::uint8_t width() const noexcept { return size_.width; }
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[[nodiscard]] constexpr std::uint8_t height() const noexcept { return size_.height; }
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[[nodiscard]] constexpr const auto &size() const noexcept { return size_; }
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[[nodiscard]] constexpr auto centered() const noexcept
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{
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return rect{
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{ static_cast<std::uint8_t>((40 - size_.width) / 2), static_cast<std::uint8_t>((20 - size_.height) / 2) }, size_
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};
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}
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[[nodiscard]] constexpr bool intersects(const rect &other) const noexcept
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{
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const auto my_tl = top_left();
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const auto my_br = bottom_right();
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const auto other_tl = other.top_left();
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const auto other_br = other.bottom_right();
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return my_tl <= other_tl && my_br >= other_br;
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};
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point tl;
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geometry::size size_;
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};
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struct point_in_size
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{
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point p;
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size s;
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constexpr auto &operator++() noexcept
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{
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++p.x;
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if (p.x == s.width) {
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p.x = 0;
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++p.y;
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}
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return *this;
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}
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[[nodiscard]] constexpr bool operator==(const point_in_size &other) const = default;
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[[nodiscard]] constexpr bool operator!=(const point_in_size &other) const = default;
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[[nodiscard]] constexpr const point &operator*() const { return p; }
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};
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constexpr auto begin(const size s) { return point_in_size{ { 0, 0 }, s }; }
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constexpr auto end(const size s) { return point_in_size{ { 0, s.height }, s }; }
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}// namespace geometry
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#endif// INC_6502_C_GEOMETRY_HPP
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