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Diffstat (limited to 'src/com/android/camera/ui/motion/UnitCurves.java')
-rw-r--r-- | src/com/android/camera/ui/motion/UnitCurves.java | 44 |
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 --- /dev/null +++ b/src/com/android/camera/ui/motion/UnitCurves.java @@ -0,0 +1,44 @@ +/* + * 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)); + } +} |