1 files changed, 44 insertions, 0 deletions
diff --git a/src/com/android/camera/ui/motion/UnitCurves.java b/src/com/android/camera/ui/motion/UnitCurves.java
new file mode 100644
index 000000000..a1117fa96
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+++ b/src/com/android/camera/ui/motion/UnitCurves.java
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+/*
+ * Copyright (C) 2014 The Android Open Source Project
+ *
+ * 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.
+ */
+
+package com.android.camera.ui.motion;
+
+/**
+ * Predefined material curves and animations.
+ */
+public class UnitCurves {
+    public static final UnitCurve FAST_OUT_SLOW_IN = new UnitBezier(0.4f, 0.0f, 0.2f, 1.0f);
+    public static final UnitCurve LINEAR_OUT_SLOW_IN = new UnitBezier(0.0f, 0.0f, 0.2f, 1.0f);
+    public static final UnitCurve FAST_OUT_LINEAR_IN = new UnitBezier(0.4f, 0.0f, 1.0f, 1.0f);
+    public static final UnitCurve LINEAR = new UnitBezier(0.0f, 0.0f, 1.0f, 1.0f);
+
+    /**
+     * Given two curves (from and to) and a time along the from curve, compute
+     * the time at t, and find a t along the 'toCurve' that will produce the
+     * same output. This is useful when interpolating between two different curves
+     * when the animation is not at the beginning or end.
+     *
+     * @param enterCurve the curve to compute the value from
+     * @param exitCurve the curve to find a time t on that matches output of
+     *                  enterCurve at T.
+     * @param t the time at which to compute the value (0..1)
+     * @return the time along the exitCurve.
+     */
+    public static float mapEnterCurveToExitCurveAtT(UnitCurve enterCurve, UnitCurve exitCurve,
+          float t) {
+        return exitCurve.tAt(1 - enterCurve.valueAt(t));
+    }
+}