| /* |
| * Copyright (C) 2015 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 androidx.core.view.animation; |
| |
| import android.graphics.Path; |
| import android.os.Build; |
| import android.view.animation.Interpolator; |
| import android.view.animation.PathInterpolator; |
| |
| /** |
| * Helper for creating path-based {@link Interpolator} instances. On API 21 or newer, the |
| * platform implementation will be used and on older platforms a compatible alternative |
| * implementation will be used. |
| */ |
| public final class PathInterpolatorCompat { |
| |
| private PathInterpolatorCompat() { |
| // prevent instantiation |
| } |
| |
| /** |
| * Create an {@link Interpolator} for an arbitrary {@link Path}. The {@link Path} |
| * must begin at {@code (0, 0)} and end at {@code (1, 1)}. The x-coordinate along the |
| * {@link Path} is the input value and the output is the y coordinate of the line at that |
| * point. This means that the Path must conform to a function {@code y = f(x)}. |
| * <p/> |
| * The {@link Path} must not have gaps in the x direction and must not |
| * loop back on itself such that there can be two points sharing the same x coordinate. |
| * |
| * @param path the {@link Path} to use to make the line representing the {@link Interpolator} |
| * @return the {@link Interpolator} representing the {@link Path} |
| */ |
| public static Interpolator create(Path path) { |
| if (Build.VERSION.SDK_INT >= 21) { |
| return new PathInterpolator(path); |
| } |
| return new PathInterpolatorApi14(path); |
| } |
| |
| /** |
| * Create an {@link Interpolator} for a quadratic Bezier curve. The end points |
| * {@code (0, 0)} and {@code (1, 1)} are assumed. |
| * |
| * @param controlX the x coordinate of the quadratic Bezier control point |
| * @param controlY the y coordinate of the quadratic Bezier control point |
| * @return the {@link Interpolator} representing the quadratic Bezier curve |
| */ |
| public static Interpolator create(float controlX, float controlY) { |
| if (Build.VERSION.SDK_INT >= 21) { |
| return new PathInterpolator(controlX, controlY); |
| } |
| return new PathInterpolatorApi14(controlX, controlY); |
| } |
| |
| /** |
| * Create an {@link Interpolator} for a cubic Bezier curve. The end points |
| * {@code (0, 0)} and {@code (1, 1)} are assumed. |
| * |
| * @param controlX1 the x coordinate of the first control point of the cubic Bezier |
| * @param controlY1 the y coordinate of the first control point of the cubic Bezier |
| * @param controlX2 the x coordinate of the second control point of the cubic Bezier |
| * @param controlY2 the y coordinate of the second control point of the cubic Bezier |
| * @return the {@link Interpolator} representing the cubic Bezier curve |
| */ |
| public static Interpolator create(float controlX1, float controlY1, |
| float controlX2, float controlY2) { |
| if (Build.VERSION.SDK_INT >= 21) { |
| return new PathInterpolator(controlX1, controlY1, controlX2, controlY2); |
| } |
| return new PathInterpolatorApi14(controlX1, controlY1, controlX2, controlY2); |
| } |
| } |