New test in FrameworkTest for the VelocityTracker class
This commit is contained in:
Marc Capdevielle
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/*
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* Copyright (C) 2010 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.android.frameworktest.view;
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import junit.framework.Assert;
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import android.test.InstrumentationTestCase;
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import android.test.suitebuilder.annotation.MediumTest;
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import android.view.MotionEvent;
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import android.view.VelocityTracker;
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import android.view.animation.AccelerateInterpolator;
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import android.view.animation.DecelerateInterpolator;
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import android.view.animation.Interpolator;
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import android.view.animation.LinearInterpolator;
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/**
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* Exercises {@link android.view.VelocityTracker} to compute correct velocity.<br>
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* To launch this test, use :<br>
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* <code>./development/testrunner/runtest.py framework -c com.android.frameworktest.view.VelocityTest</code>
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*/
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public class VelocityTest extends InstrumentationTestCase {
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@MediumTest
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public void testInitialCondiditions() {
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VelocityTracker vt = VelocityTracker.obtain();
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assertNotNull(vt);
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vt.recycle();
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}
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/**
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* Test that {@link android.view.VelocityTracker}.clear() clears
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* the previous values after a call to computeCurrentVelocity()
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*/
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@MediumTest
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public void testClear() {
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long t = System.currentTimeMillis();
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VelocityTracker vt = VelocityTracker.obtain();
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drag(vt, 100, 200, 100, 200, 10, t, 300);
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vt.computeCurrentVelocity(1);
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assertFalse("Velocity should not be null", vt.getXVelocity() == 0.0f);
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assertFalse("Velocity should not be null", vt.getYVelocity() == 0.0f);
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vt.clear();
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vt.computeCurrentVelocity(1);
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assertEquals(0.0f, vt.getXVelocity());
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assertEquals(0.0f, vt.getYVelocity());
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vt.recycle();
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}
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@MediumTest
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public void testDragAcceleration () {
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long t = System.currentTimeMillis();
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VelocityTracker vt = VelocityTracker.obtain();
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drag(vt, 100, 200, 100, 200, 15, t, 400, new AccelerateInterpolator());
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vt.computeCurrentVelocity(1000);
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assertGreater(250.0f, vt.getXVelocity());
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assertGreater(250.0f, vt.getYVelocity());
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vt.recycle();
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}
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@MediumTest
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public void testDragDeceleration () {
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long t = System.currentTimeMillis();
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VelocityTracker vt = VelocityTracker.obtain();
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drag(vt, 100, 200, 100, 200, 15, t, 400, new DecelerateInterpolator());
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vt.computeCurrentVelocity(1000);
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assertLower(250.0f, vt.getXVelocity());
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assertLower(250.0f, vt.getYVelocity());
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vt.recycle();
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}
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@MediumTest
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public void testDragLinearHorizontal() {
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long t = System.currentTimeMillis();
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VelocityTracker vt = VelocityTracker.obtain();
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// 100px in 400ms => 250px/s
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drag(vt, 100, 200, 200, 200, 15, t, 400);
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vt.computeCurrentVelocity(1000);
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assertEquals(0.0f, vt.getYVelocity());
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assertEqualFuzzy(250.0f, vt.getXVelocity(), 4f);
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vt.recycle();
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}
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@MediumTest
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public void testDragLinearVertical() {
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long t = System.currentTimeMillis();
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VelocityTracker vt = VelocityTracker.obtain();
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// 100px in 400ms => 250px/s
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drag(vt, 200, 200, 100, 200, 15, t, 400);
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vt.computeCurrentVelocity(1000);
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assertEquals(0.0f, vt.getXVelocity());
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assertEqualFuzzy(250.0f, vt.getYVelocity(), 4f);
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vt.recycle();
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}
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/**
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* Test dragging with two points only
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* (velocity must be an exact value)
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*/
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@MediumTest
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public void testDragWith2Points () {
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long t = System.currentTimeMillis();
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VelocityTracker vt = VelocityTracker.obtain();
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// 100px, 2 steps, 100ms => 1000px/s
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drag(vt, 100, 200, 100, 200, 2, t, 100);
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vt.computeCurrentVelocity(1000);
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assertEquals(1000.0f, vt.getXVelocity());
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assertEquals(1000.0f, vt.getYVelocity());
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vt.recycle();
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}
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/**
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* Velocity is independent of the number of points used during
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* the same interval
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*/
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@MediumTest
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public void testStabilityInNbPoints () {
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long t = System.currentTimeMillis();
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VelocityTracker vt = VelocityTracker.obtain();
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drag(vt, 100, 200, 100, 200, 10, t, 400); // 10 steps over 400ms
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vt.computeCurrentVelocity(1);
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float firstX = vt.getXVelocity();
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float firstY = vt.getYVelocity();
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vt.clear();
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drag(vt, 100, 200, 100, 200, 20, t, 400); // 20 steps over 400ms
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vt.computeCurrentVelocity(1);
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float secondX = vt.getXVelocity();
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float secondY = vt.getYVelocity();
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assertEqualFuzzy(firstX, secondX, 0.1f);
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assertEqualFuzzy(firstY, secondY, 0.1f);
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vt.recycle();
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}
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/**
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* Velocity is independent of the time when the events occurs,
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* it only depends on delays between the events.
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*/
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@MediumTest
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public void testStabilityInTime () {
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long t = System.currentTimeMillis();
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VelocityTracker vt = VelocityTracker.obtain();
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drag(vt, 100, 200, 100, 200, 10, t, 400);
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vt.computeCurrentVelocity(1);
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float firstX = vt.getXVelocity();
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float firstY = vt.getYVelocity();
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vt.clear();
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drag(vt, 100, 200, 100, 200, 10, t + 3600*1000, 400); // on hour later
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vt.computeCurrentVelocity(1);
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float secondX = vt.getXVelocity();
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float secondY = vt.getYVelocity();
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assertEqualFuzzy(firstX, secondX, 0.1f);
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assertEqualFuzzy(firstY, secondY, 0.1f);
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vt.recycle();
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}
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/**
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* Velocity is independent of the position of the events,
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* it only depends on their relative distance.
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*/
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@MediumTest
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public void testStabilityInSpace () {
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long t = System.currentTimeMillis();
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VelocityTracker vt = VelocityTracker.obtain();
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drag(vt, 100, 200, 100, 200, 10, t, 400);
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vt.computeCurrentVelocity(1);
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float firstX = vt.getXVelocity();
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float firstY = vt.getYVelocity();
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vt.clear();
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drag(vt, 200, 300, 200, 300, 10, t, 400); // 100px further
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vt.computeCurrentVelocity(1);
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float secondX = vt.getXVelocity();
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float secondY = vt.getYVelocity();
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assertEqualFuzzy(firstX, secondX, 0.1f);
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assertEqualFuzzy(firstY, secondY, 0.1f);
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vt.recycle();
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}
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/**
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* Test that calls to {@link android.view.VelocityTracker}.computeCurrentVelocity()
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* will output same values when using the same data.
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*/
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@MediumTest
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public void testStabilityOfComputation() {
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long t = System.currentTimeMillis();
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VelocityTracker vt = VelocityTracker.obtain();
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drag(vt, 100, 200, 100, 200, 10, t, 300);
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vt.computeCurrentVelocity(1);
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float firstX = vt.getXVelocity();
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float firstY = vt.getYVelocity();
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vt.computeCurrentVelocity(1);
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float secondX = vt.getXVelocity();
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float secondY = vt.getYVelocity();
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assertEquals(firstX, secondX);
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assertEquals(firstY, secondY);
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vt.recycle();
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}
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/**
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* Test the units parameter of {@link android.view.VelocityTracker}.computeCurrentVelocity()
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*/
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@MediumTest
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public void testStabilityOfUnits() {
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long t = System.currentTimeMillis();
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VelocityTracker vt = VelocityTracker.obtain();
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drag(vt, 100, 200, 100, 200, 10, t, 300);
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vt.computeCurrentVelocity(1);
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float firstX = vt.getXVelocity();
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float firstY = vt.getYVelocity();
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vt.computeCurrentVelocity(1000);
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float secondX = vt.getXVelocity();
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float secondY = vt.getYVelocity();
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assertEqualFuzzy(firstX, secondX / 1000.0f, 0.1f);
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assertEqualFuzzy(firstY, secondY / 1000.0f, 0.1f);
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vt.recycle();
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}
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/**
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* Simulate a drag by giving directly MotionEvents to
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* the VelocityTracker using a linear interpolator
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*/
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private void drag(VelocityTracker vt, int startX, int endX, int startY, int endY, int steps,
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long startime, int duration) {
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drag(vt, startX, endX, startY, endY, steps, startime, duration, new LinearInterpolator());
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}
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/**
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* Simulate a drag by giving directly MotionEvents to
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* the VelocityTracker using a given interpolator
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*/
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private void drag(VelocityTracker vt, int startX, int endX, int startY, int endY, int steps,
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long startime, int duration, Interpolator interpolator) {
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addMotionEvent(vt, startX, startY, startime, MotionEvent.ACTION_DOWN);
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float dt = duration / (float)steps;
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int distX = endX - startX;
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int distY = endY - startY;
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for (int i=1; i<steps-1; i++) {
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float ii = interpolator.getInterpolation(i / (float)steps);
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int x = (int) (startX + distX * ii);
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int y = (int) (startY + distY * ii);
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long time = startime + (int) (i * dt);
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addMotionEvent(vt, x, y, time, MotionEvent.ACTION_MOVE);
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}
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addMotionEvent(vt, endX, endY, startime + duration, MotionEvent.ACTION_UP);
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}
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private void addMotionEvent(VelocityTracker vt, int x, int y, long time, int action) {
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MotionEvent me = MotionEvent.obtain(time, time, action, x, y, 0);
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vt.addMovement(me);
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me.recycle();
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}
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/**
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* Float imprecision of the average computations and filtering
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* (removing last MotionEvent for N > 3) implies that tests
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* accepts some approximated values.
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*/
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private void assertEqualFuzzy(float expected, float actual, float threshold) {
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boolean fuzzyEqual = actual >= expected - threshold && actual <= expected + threshold;
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Assert.assertTrue("Expected: <"+expected+"> but was: <"+actual+
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"> while accepting a variation of: <"+threshold+">", fuzzyEqual);
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}
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private void assertGreater(float minExpected, float actual) {
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Assert.assertTrue("Expected: minimum <"+minExpected+"> but was: <"+actual+">",
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actual > minExpected);
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}
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private void assertLower(float maxExpected, float actual) {
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Assert.assertTrue("Expected: maximum <"+maxExpected+"> but was: <"+actual+">",
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actual < maxExpected);
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}
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}
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