Rect.hh

/*
  libSDL2pp - C++ bindings/wrapper for SDL2
  Copyright (C) 2013-2015 Dmitry Marakasov <amdmi3@amdmi3.ru>
 
  This software is provided 'as-is', without any express or implied
  warranty.  In no event will the authors be held liable for any damages
  arising from the use of this software.
 
  Permission is granted to anyone to use this software for any purpose,
  including commercial applications, and to alter it and redistribute it
  freely, subject to the following restrictions:
 
  1. The origin of this software must not be misrepresented; you must not
     claim that you wrote the original software. If you use this software
     in a product, an acknowledgment in the product documentation would be
     appreciated but is not required.
  2. Altered source versions must be plainly marked as such, and must not be
     misrepresented as being the original software.
  3. This notice may not be removed or altered from any source distribution.
*/
 
#ifndef SDL2PP_RECT_HH
#define SDL2PP_RECT_HH
 
#include <functional>
 
#include <SDL_rect.h>
 
#include <SDL2pp/Optional.hh>
#include <SDL2pp/Point.hh>
#include <SDL2pp/Export.hh>
 
namespace SDL2pp {
 
class SDL2PP_EXPORT Rect : public SDL_Rect {
public:
    constexpr Rect() : SDL_Rect{0, 0, 0, 0} {
    }
 
    constexpr Rect(const SDL_Rect& rect) : SDL_Rect{rect.x, rect.y, rect.w, rect.h} {
    }
 
    constexpr Rect(const Point& corner, const Point& size) : SDL_Rect{corner.x, corner.y, size.x, size.y} {
    }
 
    constexpr Rect(int x, int y, int w, int h) : SDL_Rect{x, y, w, h} {
    }
 
    static constexpr Rect FromCenter(int cx, int cy, int w, int h) {
        return Rect(cx - w/2, cy - h/2, w, h);
    }
 
    static constexpr Rect FromCenter(const Point& center, const Point& size) {
        return Rect(center - size / 2, size);
    }
 
    static constexpr Rect FromCorners(int x1, int y1, int x2, int y2) {
        return Rect(x1, y1, x2 - x1 + 1, y2 - y1 + 1);
    }
 
    static constexpr Rect FromCorners(const Point& p1, const Point& p2) {
        return Rect(p1, p2 - p1 + Point(1, 1));
    }
 
    Rect(const Rect&) noexcept = default;
 
    Rect(Rect&&) noexcept = default;
 
    Rect& operator=(const Rect&) noexcept = default;
 
    Rect& operator=(Rect&&) noexcept = default;
 
    constexpr int GetX() const {
        return x;
    }
 
    Rect& SetX(int nx) {
        x = nx;
        return *this;
    }
 
    constexpr int GetY() const {
        return y;
    }
 
    Rect& SetY(int ny) {
        y = ny;
        return *this;
    }
 
    constexpr int GetW() const {
        return w;
    }
 
    Rect& SetW(int nw) {
        w = nw;
        return *this;
    }
 
    constexpr int GetH() const {
        return h;
    }
 
    Rect& SetH(int nh) {
        h = nh;
        return *this;
    }
 
    constexpr int GetX2() const {
        return x + w - 1;
    }
 
    Rect& SetX2(int x2) {
        w = x2 - x + 1;
        return *this;
    }
 
    constexpr int GetY2() const {
        return y + h - 1;
    }
 
    Rect& SetY2(int y2) {
        h = y2 - y + 1;
        return *this;
    }
 
    constexpr Point GetTopLeft() const {
        return Point(x, y);
    }
 
    constexpr Point GetTopRight() const {
        return Point(GetX2(), y);
    }
 
    constexpr Point GetBottomLeft() const {
        return Point(x, GetY2());
    }
 
    constexpr Point GetBottomRight() const {
        return Point(GetX2(), GetY2());
    }
 
    constexpr Point GetSize() const {
        return Point(w, h);
    }
 
    constexpr Point GetCentroid() const {
        return Point(x + w/2, y + h/2);
    }
 
    constexpr bool Contains(int px, int py) const {
        return px >= x && py >= y && px <= GetX2() && py <= GetY2();
    }
 
    constexpr bool Contains(const Point& point) const {
        return point.x >= x && point.y >= y && point.x <= GetX2() && point.y <= GetY2();
    }
 
    constexpr bool Contains(const Rect& rect) const {
        return rect.x >= x && rect.y >= y && rect.GetX2() <= GetX2() && rect.GetY2() <= GetY2();
    }
 
    constexpr bool Intersects(const Rect& rect) const {
        return !(rect.GetX2() < x || rect.GetY2() < y || rect.x > GetX2() || rect.y > GetY2());
    }
 
    Rect GetUnion(const Rect& rect) const;
 
    Rect& Union(const Rect& rect);
 
    Rect GetExtension(unsigned int amount) const;
 
    Rect GetExtension(unsigned int hamount, unsigned int vamount) const;
 
    Rect& Extend(unsigned int amount);
 
    Rect& Extend(unsigned int hamount, unsigned int vamount);
 
    Optional<Rect> GetIntersection(const Rect& rect) const;
 
    bool IntersectLine(int& x1, int& y1, int& x2, int& y2) const;
 
    bool IntersectLine(Point& p1, Point& p2) const;
 
    constexpr Rect operator+(const Point& offset) const {
        return Rect(x + offset.x, y + offset.y, w, h);
    }
 
    constexpr Rect operator-(const Point& offset) const {
        return Rect(x - offset.x, y - offset.y, w, h);
    }
 
    Rect& operator+=(const Point& offset) {
        x += offset.x;
        y += offset.y;
        return *this;
    }
 
    Rect& operator-=(const Point& offset) {
        x -= offset.x;
        y -= offset.y;
        return *this;
    }
};
 
}
 
constexpr bool operator==(const SDL2pp::Rect& a, const SDL2pp::Rect& b) {
    return a.x == b.x && a.y == b.y && a.w == b.w && a.h == b.h;
}
 
constexpr bool operator!=(const SDL2pp::Rect& a, const SDL2pp::Rect& b) {
    return !(a == b);
}
 
SDL2PP_EXPORT bool operator<(const SDL2pp::Rect& a, const SDL2pp::Rect& b);
 
SDL2PP_EXPORT std::ostream& operator<<(std::ostream& stream, const SDL2pp::Rect& rect);
 
namespace std {
 
template<>
struct hash<SDL2pp::Rect> {
    size_t operator()(const SDL2pp::Rect& r) const {
        size_t seed = std::hash<int>()(r.x);
        seed ^= std::hash<int>()(r.y) + 0x9e3779b9 + (seed<<6) + (seed>>2);
        seed ^= std::hash<int>()(r.w) + 0x9e3779b9 + (seed<<6) + (seed>>2);
        seed ^= std::hash<int>()(r.h) + 0x9e3779b9 + (seed<<6) + (seed>>2);
        return seed;
    }
};
 
}
 
#endif