Merge pull request #37 from crupest/render

Refactor.

1 files changed, 51 insertions, 0 deletions

diff --git a/src/util/math_util.hpp b/src/util/math_util.hpp
new file mode 100644
index 00000000..01348641
--- /dev/null
+++ b/src/util/math_util.hpp
@@ -0,0 +1,51 @@
+#pragma once
+#include "pre.hpp"
+
+#include <optional>
+#include <type_traits>
+
+namespace cru::util {
+template <typename T, typename = std::enable_if_t<std::is_arithmetic_v<T>>>
+float Coerce(const T n, const std::optional<T> min,
+             const std::optional<T> max) {
+  if (min.has_value() && n < min.value()) return min.value();
+  if (max.has_value() && n > max.value()) return max.value();
+  return n;
+}
+
+template <typename T, typename = std::enable_if_t<std::is_arithmetic_v<T>>>
+float Coerce(const T n, const T min, const T max) {
+  if (n < min) return min;
+  if (n > max) return max;
+  return n;
+}
+
+template <typename T, typename = std::enable_if_t<std::is_arithmetic_v<T>>>
+float Coerce(const T n, const std::nullopt_t, const std::optional<T> max) {
+  if (max.has_value() && n > max.value()) return max.value();
+  return n;
+}
+
+template <typename T, typename = std::enable_if_t<std::is_arithmetic_v<T>>>
+float Coerce(const T n, const std::optional<T> min, const std::nullopt_t) {
+  if (min.has_value() && n < min.value()) return min.value();
+  return n;
+}
+
+template <typename T, typename = std::enable_if_t<std::is_arithmetic_v<T>>>
+float Coerce(const T n, const std::nullopt_t, const T max) {
+  if (n > max) return max;
+  return n;
+}
+
+template <typename T, typename = std::enable_if_t<std::is_arithmetic_v<T>>>
+float Coerce(const T n, const T min, const std::nullopt_t) {
+  if (n < min) return min;
+  return n;
+}
+
+template <typename T, typename = std::enable_if_t<std::is_arithmetic_v<T>>>
+T AtLeast0(const T value) {
+  return value < static_cast<T>(0) ? static_cast<T>(0) : value;
+}
+}  // namespace cru::util