1/*
2 * Copyright (C) 2010 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package com.android.gallery3d.anim;
18
19import android.test.suitebuilder.annotation.SmallTest;
20import android.util.Log;
21import android.view.animation.Interpolator;
22
23import junit.framework.TestCase;
24
25@SmallTest
26public class AnimationTest extends TestCase {
27    private static final String TAG = "AnimationTest";
28
29    public void testFloatAnimation() {
30        FloatAnimation a = new FloatAnimation(0f, 1f, 10);  // value 0 to 1.0, duration 10
31        a.start();                 // start animation
32        assertTrue(a.isActive());  // should be active now
33        a.calculate(0);            // set start time = 0
34        assertTrue(a.get() == 0);  // start value should be 0
35        a.calculate(1);            // calculate value for time 1
36        assertFloatEq(a.get(), 0.1f);
37        a.calculate(5);            // calculate value for time 5
38        assertTrue(a.get() == 0.5);//
39        a.calculate(9);            // calculate value for time 9
40        assertFloatEq(a.get(), 0.9f);
41        a.calculate(10);           // calculate value for time 10
42        assertTrue(!a.isActive()); // should be inactive now
43        assertTrue(a.get() == 1.0);//
44        a.start();                 // restart
45        assertTrue(a.isActive());  // should be active now
46        a.calculate(5);            // set start time = 5
47        assertTrue(a.get() == 0);  // start value should be 0
48        a.calculate(5+9);          // calculate for time 5+9
49        assertFloatEq(a.get(), 0.9f);
50    }
51
52    private static class MyInterpolator implements Interpolator {
53        public float getInterpolation(float input) {
54            return 4f * (input - 0.5f);  // maps [0,1] to [-2,2]
55        }
56    }
57
58    public void testInterpolator() {
59        FloatAnimation a = new FloatAnimation(0f, 1f, 10);  // value 0 to 1.0, duration 10
60        a.setInterpolator(new MyInterpolator());
61        a.start();                 // start animation
62        a.calculate(0);            // set start time = 0
63        assertTrue(a.get() == -2); // start value should be -2
64        a.calculate(1);            // calculate value for time 1
65        assertFloatEq(a.get(), -1.6f);
66        a.calculate(5);            // calculate value for time 5
67        assertTrue(a.get() == 0);  //
68        a.calculate(9);            // calculate value for time 9
69        assertFloatEq(a.get(), 1.6f);
70        a.calculate(10);           // calculate value for time 10
71        assertTrue(a.get() == 2);  //
72    }
73
74    public static void assertFloatEq(float expected, float actual) {
75        if (Math.abs(actual - expected) > 1e-6) {
76            Log.v(TAG, "expected: " + expected + ", actual: " + actual);
77            fail();
78        }
79    }
80}
81