add tweaks for st-refactor

1 files changed, 33 insertions, 0 deletions

diff --git a/common/accel-power.hpp b/common/accel-power.hpp
new file mode 100644
index 0000000..c8b12cd
--- /dev/null
+++ b/common/accel-power.hpp
@@ -0,0 +1,33 @@
+#pragma once
+
+#include <math.h>
+
+#include "accel-base.hpp"
+
+namespace rawaccel {
+
+	/// <summary> Struct to hold power (non-additive) acceleration implementation. </summary>
+	struct accel_power : accel_base {
+		double exponent;
+		double offset;
+
+		accel_power(accel_args args) {
+			verify(args);
+
+			speed_coeff = args.power_scale;
+			exponent = args.exponent;
+			offset = args.offset;
+		}
+
+		inline double accelerate(double speed) const {
+			// f(x) = (mx)^k
+			return (offset > 0 && speed < 1) ? 1 : pow(speed * speed_coeff, exponent);
+		}
+
+		void verify(accel_args args) const {
+			if (args.power_scale < 0) error("scale can not be negative");
+			if (args.exponent <= 0) error("exponent must be greater than 0");
+		}
+	};
+
+}