1 files changed, 150 insertions, 0 deletions
diff --git a/Runtime/Math/Rect.h b/Runtime/Math/Rect.h
new file mode 100644
index 0000000..3b4f16c
--- /dev/null
+++ b/Runtime/Math/Rect.h
@@ -0,0 +1,150 @@
+#ifndef RECT_H
+#define RECT_H
+
+#include "Vector2.h"
+
+/// A rectangle.
+template <typename T>
+class RectT
+{
+public:
+    typedef RectT<T> RectType;
+    typedef float BaseType;
+
+    T x; ///< Rectangle x coordinate.
+    T y; ///< Rectangle y coordinate.
+    T width; ///< Rectangle width.
+    T height; ///< Rectangle height.
+
+    inline static const char* GetTypeString();
+    inline static bool IsAnimationChannel() { return false; }
+    inline static bool MightContainPPtr() { return false; }
+    /// Create a empty rectangle.
+    RectT()
+    {
+        Reset();
+    }
+
+    /// Create a new rectangle.
+    RectT(T inX, T inY, T iWidth, T iHeight)
+    {
+        x = inX; width = iWidth;
+        y = inY; height = iHeight;
+    }
+
+    T GetRight() const { return x + width; }
+    T GetBottom() const { return y + height; }
+    void SetLeft(T l) { T oldXMax = GetXMax(); x = l; width = oldXMax - x; }
+    void SetTop(T t) { T oldYMax = GetYMax(); y = t; height = oldYMax - y; }
+    void SetRight(T r) { width = r - x; }
+    void SetBottom(T b) { height = b - y; }
+
+
+    T GetXMax() const { return x + width; }
+    T GetYMax() const { return y + height; }
+
+    /// Return true if rectangle is empty.
+    inline bool IsEmpty() const { return width <= 0 || height <= 0; }
+
+    inline void		SetPosition(const Vector2f& position) { x = position.x; y = position.y; }
+    inline Vector2f GetPosition() const { return Vector2f(x, y); }
+
+    inline void		SetSize(const Vector2f& size) { width = size.x; height = size.y; }
+    inline Vector2f GetSize() const { return Vector2f(width, height); }
+    /// Resets the rectangle
+    inline void Reset() { x = y = width = height = 0; }
+
+    /// Sets the rectangle
+    inline void Set(T inX, T inY, T iWidth, T iHeight)
+    {
+        x = inX; width = iWidth;
+        y = inY; height = iHeight;
+    }
+
+    inline void Scale(T dx, T dy) { x *= dx; width *= dx; y *= dy; height *= dy; }
+
+    /// Set Center position of rectangle (size stays the same)
+    void SetCenterPos(T cx, T cy) { x = cx - width / 2; y = cy - height / 2; }
+    Vector2f GetCenterPos() const { return Vector2f(x + (BaseType)width / 2, y + (BaseType)height / 2); }
+
+    /// Ensure this is inside the rect r.
+    void Clamp(const RectType &r)
+    {
+        T x2 = x + width;
+        T y2 = y + height;
+        T rx2 = r.x + r.width;
+        T ry2 = r.y + r.height;
+
+        if (x < r.x) x = r.x;
+        if (x2 > rx2) x2 = rx2;
+        if (y < r.y) y = r.y;
+        if (y2 > ry2) y2 = ry2;
+
+        width = x2 - x;
+        if (width < 0) width = 0;
+
+        height = y2 - y;
+        if (height < 0) height = 0;
+    }
+
+    /// Move rectangle by deltaX, deltaY.
+    inline void Move(T dX, T dY) { x += dX; y += dY; }
+
+    /// Return the width of rectangle.
+    inline T Width() const { return width; }
+
+    /// Return the height of rectangle.
+    inline T Height() const { return height; }
+
+    /// Return true if a point lies within rectangle bounds.
+    inline bool Contains(T px, T py) const { return (px >= x) && (px < x + width) && (py >= y) && (py < y + height); }
+    inline bool Contains(const Vector2f& p) const { return Contains(p.x, p.y); }
+    /// Return true if a relative point lies within rectangle bounds.
+    inline bool ContainsRel(T x, T y) const
+    {
+        return (x >= 0) && (x < Width()) && (y >= 0) && (y < Height());
+    }
+
+    inline bool Intersects(const RectType& r) const
+    {
+        // Rects are disjoint if there's at least one separating axis
+        bool disjoint = x + width < r.x;
+        disjoint |= r.x + r.width < x;
+        disjoint |= y + height < r.y;
+        disjoint |= r.y + r.height < y;
+        return !disjoint;
+    }
+
+    /// Normalize a rectangle such that xmin <= xmax and ymin <= ymax.
+    inline void Normalize()
+    {
+        width = std::max<T>(width, 0);
+        height = std::max<T>(height, 0);
+    }
+
+    bool operator == (const RectType& r)const { return x == r.x && y == r.y && width == r.width && height == r.height; }
+    bool operator != (const RectType& r)const { return x != r.x || y != r.y || width != r.width || height != r.height; }
+};
+
+typedef RectT<float> Rectf;
+typedef RectT<int> RectInt;
+
+template<> inline const char* Rectf::GetTypeString() { return "Rectf"; }
+template<> inline const char* RectInt::GetTypeString() { return "RectInt"; }
+
+inline bool CompareApproximately(const Rectf& lhs, const Rectf& rhs)
+{
+    return CompareApproximately(lhs.x, rhs.x) && CompareApproximately(lhs.y, rhs.y) &&
+        CompareApproximately(lhs.width, rhs.width) && CompareApproximately(lhs.height, rhs.height);
+}
+
+/// Make a rect with width & height
+template<typename T>
+inline RectT<T> MinMaxRect(T minx, T miny, T maxx, T maxy) { return RectT<T>(minx, miny, maxx - minx, maxy - miny); }
+
+// RectT<float> specialization
+template<>
+inline bool Rectf::IsEmpty() const { return width <= 0.00001F || height <= 0.00001F; }
+
+
+#endif