moving circle prototype, circle and square drawing, part of food map implementation, utils

include/Vec.hpp

@@ -0,0 +1,99 @@
+#pragma once
+
+#include <cmath>
+
+template <typename T> struct Vec {
+  T x;
+  T y;
+
+  //
+
+  template <typename U> explicit operator Vec<U>() {
+    return Vec<U>{.x = x, .y = y};
+  }
+
+  //
+
+  Vec &operator-() {
+    x = -x;
+    y = -y;
+    return *this;
+  }
+
+  Vec &operator*=(const T &value) {
+    x *= value;
+    y *= value;
+    return *this;
+  }
+
+  Vec &operator/=(const T &value) {
+    x /= value;
+    y /= value;
+    return *this;
+  }
+
+  Vec operator*(const T &value) const {
+    auto copy = Vec{*this};
+    copy *= value;
+    return copy;
+  }
+
+  Vec operator/(const T &value) const {
+    auto copy = Vec{*this};
+    copy /= value;
+    return copy;
+  }
+
+  //
+
+  Vec &operator+=(const Vec &other) {
+    x += other.x;
+    y += other.y;
+    return *this;
+  }
+
+  Vec &operator-=(const Vec &other) {
+    x -= other.x;
+    y -= other.y;
+    return *this;
+  }
+
+  Vec operator+(const Vec &other) const {
+    auto copy = Vec{*this};
+    copy += other;
+    return copy;
+  }
+
+  Vec operator-(const Vec &other) const {
+    auto copy = Vec{*this};
+    copy -= other;
+    return copy;
+  }
+
+  //
+
+  bool operator==(const Vec &other) const = default;
+
+  bool operator!=(const Vec &other) const = default;
+
+  //
+
+  int len_sq() const { return dot(*this, *this); }
+
+  double len() const { return std::sqrt(len_sq()); }
+
+  Vec<double> norm() { return Vec<double>(*this) / len(); }
+
+  //
+
+  int static dot(Vec left, Vec right) {
+    return left.x * right.x + left.y * right.y;
+  }
+
+  int static cross(Vec left, Vec right) {
+    return left.x * right.y - left.y * right.x;
+  }
+};
+
+using Veci = Vec<int>;
+using Vecf = Vec<double>;