Added the dealer proper.

src/display/animation/animation.h

@@ -0,0 +1,37 @@
+/**
+ * Copyright (c) 2021 Dominic Masters
+ * 
+ * This software is released under the MIT License.
+ * https://opensource.org/licenses/MIT
+ */
+
+#include <dawn/dawn.h>
+
+/**
+ * Animation tool for converting 0-1 space into a 0-0.5 back to zero space. This
+ * is intended to make a "Forward then backwards" effect for animation. This 
+ * method will not scale t.
+ * @param t Time in space to back and fourth on between 0 and 1.
+ * @returns Forward and backwards time. 0 to 0.5 are as such, 0.5 to 1 are from
+ * 0.5 to 0.
+ */
+float animForwardAndBackward(float t);
+
+/**
+ * Animation tool for converting 0-1 space into a 0-1-0 space. Scaled version of
+ * animForwardAndBackward().
+ * @param t Time in space to back and fourth on between 0 and 1.
+ * @returns Forward and backwards time.
+ */
+float animForwardAndBackwardScaled(float t);
+
+/**
+ * Returns the time scale (speed to multiply time range by) for a given frame
+ * time and frame count. E.g. 3 frames at 0.5 time each would have a time scale
+ * of 1.5.
+ * 
+ * @param frames Frames to get the scale of.
+ * @param time Time to get the scale of.
+ * @return The time scale.
+ */
+float animTimeScaleFromFrameTime(int32_t frames, float time);