Subway map hover detection with a quadtree

1 files changed, 67 insertions, 0 deletions

@@ -0,0 +1,67 @@
+#pragma once
+
+#include "Vector2.h"
+
+namespace quadtree
+{
+
+template<typename T>
+class Box
+{
+public:
+    T left;
+    T top;
+    T width; // Must be positive
+    T height; // Must be positive
+
+    constexpr Box(T Left = 0, T Top = 0, T Width = 0, T Height = 0) noexcept :
+        left(Left), top(Top), width(Width), height(Height)
+    {
+
+    }
+
+    constexpr Box(const Vector2<T>& position, const Vector2<T>& size) noexcept :
+        left(position.x), top(position.y), width(size.x), height(size.y)
+    {
+
+    }
+
+    constexpr T getRight() const noexcept
+    {
+        return left + width;
+    }
+
+    constexpr T getBottom() const noexcept
+    {
+        return top + height;
+    }
+
+    constexpr Vector2<T> getTopLeft() const noexcept
+    {
+        return Vector2<T>(left, top);
+    }
+
+    constexpr Vector2<T> getCenter() const noexcept
+    {
+        return Vector2<T>(left + width / 2, top + height / 2);
+    }
+
+    constexpr Vector2<T> getSize() const noexcept
+    {
+        return Vector2<T>(width, height);
+    }
+
+    constexpr bool contains(const Box<T>& box) const noexcept
+    {
+        return left <= box.left && box.getRight() <= getRight() &&
+            top <= box.top && box.getBottom() <= getBottom();
+    }
+
+    constexpr bool intersects(const Box<T>& box) const noexcept
+    {
+        return !(left >= box.getRight() || getRight() <= box.left ||
+            top >= box.getBottom() || getBottom() <= box.top);
+    }
+};
+
+}
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