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A library jar that provides APIs for Applications written for the Google Android Platform.

There is a newer version: 14-robolectric-10818077

/*
 * 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 android.transition;

import android.content.Context;
import android.graphics.Path;
import android.util.AttributeSet;

/**
 * This base class can be extended to provide motion along a Path to Transitions.
 *
 * 
 * Transitions such as {@link android.transition.ChangeBounds} move Views, typically
 * in a straight path between the start and end positions. Applications that desire to
 * have these motions move in a curve can change how Views interpolate in two dimensions
 * by extending PathMotion and implementing {@link #getPath(float, float, float, float)}.
 * 
 * This may be used in XML as an element inside a transition.
 *  * {@code
 * 
 *     
 * 
 * }
 * 
 */
public abstract class PathMotion {

    public PathMotion() {}

    public PathMotion(Context context, AttributeSet attrs) {}

    /**
     * Provide a Path to interpolate between two points (startX, startY) and
     * (endX, endY). This allows controlled curved motion along two dimensions.
     *
     * @param startX The x coordinate of the starting point.
     * @param startY The y coordinate of the starting point.
     * @param endX   The x coordinate of the ending point.
     * @param endY   The y coordinate of the ending point.
     * @return A Path along which the points should be interpolated. The returned Path
     * must start at point (startX, startY), typically using
     * {@link android.graphics.Path#moveTo(float, float)} and end at (endX, endY).
     */
    public abstract Path getPath(float startX, float startY, float endX, float endY);
}