Android Open Source - NineOldAndroids Path Evaluator






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Back to project page NineOldAndroids.

License

The source code is released under:

Apache License

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Java Source Code

/*
 * Copyright (C) 2012 The Android Open Source Project
 *//from   ww  w  . java  2s .co  m
 * 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.jakewharton.nineoldandroids.sample.pathanimation;

import com.nineoldandroids.animation.TypeEvaluator;

/**
 * This evaluator interpolates between two PathPoint values given the value t, the
 * proportion traveled between those points. The value of the interpolation depends
 * on the operation specified by the endValue (the operation for the interval between
 * PathPoints is always specified by the end point of that interval).
 */
public class PathEvaluator implements TypeEvaluator<PathPoint> {
    @Override
    public PathPoint evaluate(float t, PathPoint startValue, PathPoint endValue) {
        float x, y;
        if (endValue.mOperation == PathPoint.CURVE) {
            float oneMinusT = 1 - t;
            x = oneMinusT * oneMinusT * oneMinusT * startValue.mX +
                    3 * oneMinusT * oneMinusT * t * endValue.mControl0X +
                    3 * oneMinusT * t * t * endValue.mControl1X +
                    t * t * t * endValue.mX;
            y = oneMinusT * oneMinusT * oneMinusT * startValue.mY +
                    3 * oneMinusT * oneMinusT * t * endValue.mControl0Y +
                    3 * oneMinusT * t * t * endValue.mControl1Y +
                    t * t * t * endValue.mY;
        } else if (endValue.mOperation == PathPoint.LINE) {
            x = startValue.mX + t * (endValue.mX - startValue.mX);
            y = startValue.mY + t * (endValue.mY - startValue.mY);
        } else {
            x = endValue.mX;
            y = endValue.mY;
        }
        return PathPoint.moveTo(x, y);
    }
}




Java Source Code List

com.jakewharton.nineoldandroids.sample.Demos.java
com.jakewharton.nineoldandroids.sample.Toggles.java
com.jakewharton.nineoldandroids.sample.VPADemo.java
com.jakewharton.nineoldandroids.sample.apidemos.AnimationCloning.java
com.jakewharton.nineoldandroids.sample.apidemos.AnimationLoading.java
com.jakewharton.nineoldandroids.sample.apidemos.AnimationSeeking.java
com.jakewharton.nineoldandroids.sample.apidemos.AnimatorEvents.java
com.jakewharton.nineoldandroids.sample.apidemos.BouncingBalls.java
com.jakewharton.nineoldandroids.sample.apidemos.CustomEvaluator.java
com.jakewharton.nineoldandroids.sample.apidemos.MultiPropertyAnimation.java
com.jakewharton.nineoldandroids.sample.apidemos.ReversingAnimation.java
com.jakewharton.nineoldandroids.sample.apidemos.ShapeHolder.java
com.jakewharton.nineoldandroids.sample.droidflakes.Droidflakes.java
com.jakewharton.nineoldandroids.sample.droidflakes.FlakeView.java
com.jakewharton.nineoldandroids.sample.droidflakes.Flake.java
com.jakewharton.nineoldandroids.sample.pathanimation.AnimatorPath.java
com.jakewharton.nineoldandroids.sample.pathanimation.PathAnimationActivity.java
com.jakewharton.nineoldandroids.sample.pathanimation.PathEvaluator.java
com.jakewharton.nineoldandroids.sample.pathanimation.PathPoint.java
com.nineoldandroids.animation.AnimatorInflater.java
com.nineoldandroids.animation.AnimatorListenerAdapter.java
com.nineoldandroids.animation.AnimatorSet.java
com.nineoldandroids.animation.Animator.java
com.nineoldandroids.animation.ArgbEvaluator.java
com.nineoldandroids.animation.FloatEvaluator.java
com.nineoldandroids.animation.FloatKeyframeSet.java
com.nineoldandroids.animation.IntEvaluator.java
com.nineoldandroids.animation.IntKeyframeSet.java
com.nineoldandroids.animation.KeyframeSet.java
com.nineoldandroids.animation.Keyframe.java
com.nineoldandroids.animation.ObjectAnimator.java
com.nineoldandroids.animation.PreHoneycombCompat.java
com.nineoldandroids.animation.PropertyValuesHolder.java
com.nineoldandroids.animation.TimeAnimator.java
com.nineoldandroids.animation.TypeEvaluator.java
com.nineoldandroids.animation.ValueAnimator.java
com.nineoldandroids.util.FloatProperty.java
com.nineoldandroids.util.IntProperty.java
com.nineoldandroids.util.NoSuchPropertyException.java
com.nineoldandroids.util.Property.java
com.nineoldandroids.util.ReflectiveProperty.java
com.nineoldandroids.view.ViewHelper.java
com.nineoldandroids.view.ViewPropertyAnimatorHC.java
com.nineoldandroids.view.ViewPropertyAnimatorICS.java
com.nineoldandroids.view.ViewPropertyAnimatorPreHC.java
com.nineoldandroids.view.ViewPropertyAnimator.java
com.nineoldandroids.view.animation.AnimatorProxy.java