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#pragma once
#include <glm/glm.hpp>
/// Rect is a rectangle representation based on a point and a dimensions, in television coordinate space
/// (x increases from left to right, y increases from top to bottom).
template <typename T>
class Rect {
public:
using ScalarType = T;
using VectorType = glm::vec<2, T>;
public:
T x;
T y;
T width;
T height;
public:
Rect()
: x{ 0 }, y{ 0 }, width{ 0 }, height{ 0 } {
}
Rect(T x, T y, T width, T height)
: x{ x }, y{ y }, width{ width }, height{ height } {
}
Rect(VectorType pos, VectorType size)
: x{ pos.x }
, y{ pos.y }
, width{ size.x }
, height{ size.y } {
}
T x0() const { return x; }
T y0() const { return y; }
T x1() const { return x + width; }
T y1() const { return y + height; }
VectorType TopLeft() const {
return VectorType{ x, y };
}
VectorType TopRight() const {
return VectorType{ x + width, y };
}
VectorType BottomLeft() const {
return VectorType{ x, y + height };
}
VectorType BottomRight() const {
return VectorType{ x + width, y + height };
}
VectorType Center() const {
return TopLeft() + VectorType{ width / 2, height / 2 };
}
VectorType Dimensions() const {
return VectorType{ width, height };
}
VectorType Extents() const {
return VectorType{ width / 2, height / 2 };
}
/// Assumes `bySize * 2` is smaller than both `width` and `height` (does not produce a negative-dimension rectangle).
Rect Shrink(T bySize) const {
T two = bySize * 2;
return Rect{ x + bySize, y + bySize, width - two, height - two };
}
Rect Shrink(T left, T top, T right, T bottom) const {
return Rect{
x + left,
y + top,
width - left - right,
height - top - bottom,
};
}
Rect Expand(T bySize) const {
T two = bySize * 2;
return Rect{ x - bySize, y - bySize, width + two, height + two };
}
Rect Expand(T left, T top, T right, T bottom) const {
return Rect{
x - left,
y - top,
width + left + right,
height + top + bottom,
};
}
bool Contains(VectorType point) const {
return point.x >= x &&
point.y >= y &&
point.x < x + width &&
point.y < y + height;
}
bool Intersects(const Rect& that) const {
bool xBetween = x > that.x0() && x < that.x1();
bool yBetween = y > that.y0() && y < that.y1();
return xBetween && yBetween;
}
// Write min()/max() tenary by hand so that we don't have to include <algorithm>
// This file is practically going to be included in every file in this project
static Rect Intersection(const Rect& a, const Rect& b) {
auto x0 = a.x0() > b.x0() ? a.x0() : b.x0(); // Max
auto y0 = a.y0() > b.y0() ? a.y0() : b.y0(); // Max
auto x1 = a.x1() < b.x1() ? a.x1() : b.x1(); // Min
auto y1 = a.y1() < b.y1() ? a.y1() : b.y1(); // Min
auto width = x1 - x0;
auto height = y1 - x0;
return Rect{ x0, y0, width, height };
}
static Rect Union(const Rect& a, const Rect& b) {
auto x0 = a.x0() < b.x0() ? a.x0() : b.x0(); // Min
auto y0 = a.y0() < b.y0() ? a.y0() : b.y0(); // Min
auto x1 = a.x1() > b.x1() ? a.x1() : b.x1(); // Max
auto y1 = a.y1() > b.y1() ? a.y1() : b.y1(); // Max
auto width = x1 - x0;
auto height = y1 - x0;
return Rect{ x0, y0, width, height };
}
friend bool operator==(const Rect<T>&, const Rect<T>&) = default;
Rect operator+(glm::vec<2, T> offset) const {
return { x + offset.x, y + offset.y, width, height };
}
Rect operator-(glm::vec<2, T> offset) const {
return { x - offset.x, y - offset.y, width, height };
}
Rect& operator+=(glm::vec<2, T> offset) {
x += offset.x;
y += offset.y;
return *this;
}
Rect& operator-=(glm::vec<2, T> offset) {
x -= offset.x;
y -= offset.y;
return *this;
}
template <typename TTarget>
Rect<TTarget> Cast() const {
return {
static_cast<TTarget>(x),
static_cast<TTarget>(y),
static_cast<TTarget>(width),
static_cast<TTarget>(height),
};
}
};
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