add flippers

Author: 2534290808

lib/animated_interpolation.dart

@@ -6,6 +6,7 @@ export 'sliding.dart';
 export 'zooming.dart';
 export 'light_speed.dart';
 export 'attention_seekers.dart';
+export 'flippers.dart';
 ///
 /// 加强型的tween，可设置多个插值，受到React Native的插值动画启发
 /// 和tween使用方法一样

lib/flippers.dart

@@ -0,0 +1,31 @@
+import 'animated_config.dart';
+import 'light_speed.dart' show degreeToRad;
+import 'package:flutter/material.dart';
+
+Curve flipInCurve = Curves.easeIn;
+Map<double, AnimatedConfig> flipInX = {
+  0: AnimatedConfig(opacity: 0, rotateX: degreeToRad(90)),
+  0.4: AnimatedConfig(rotateX: degreeToRad(-20)),
+  0.6: AnimatedConfig(opacity: 1, rotateX: degreeToRad(10)),
+  0.8: AnimatedConfig(rotateX: degreeToRad(-5)),
+  1: AnimatedConfig(opacity: 1, rotateX: degreeToRad(0))
+};
+
+Map<double, AnimatedConfig> flipInY = {
+  0: AnimatedConfig(opacity: 0, rotateY: degreeToRad(90)),
+  0.4: AnimatedConfig(rotateY: degreeToRad(-20)),
+  0.6: AnimatedConfig(opacity: 1, rotateY: degreeToRad(10)),
+  0.8: AnimatedConfig(rotateY: degreeToRad(-5)),
+  1: AnimatedConfig(opacity: 1, rotateY: degreeToRad(0))
+};
+
+Map<double, AnimatedConfig> flipOutX = {
+  0: AnimatedConfig(opacity: 1, rotateX: degreeToRad(0)),
+  0.3: AnimatedConfig(opacity: 1, rotateX: degreeToRad(-20)),
+  1: AnimatedConfig(opacity: 0, rotateX: degreeToRad(90))
+};
+Map<double, AnimatedConfig> flipOutY = {
+  0: AnimatedConfig(opacity: 1, rotateY: degreeToRad(0)),
+  0.3: AnimatedConfig(opacity: 1, rotateY: degreeToRad(-20)),
+  1: AnimatedConfig(opacity: 0, rotateY: degreeToRad(90))
+};