Add AnimationUtils

Signed-off-by: Šimon Brandner <simon.bra.ag@gmail.com>

src/utils/AnimationUtils.ts

@@ -0,0 +1,19 @@
+/*
+Copyright 2021 Šimon Brandner <simon.bra.ag@gmail.com>
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+export function lerp(start: number, end: number, amt: number) {
+    return (1 - amt) * start + amt * end;
+}