| /* |
| * Copyright 2011 Google Inc. |
| * |
| * 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.google.gwt.touch.client; |
| |
| import com.google.gwt.touch.client.Momentum.State; |
| |
| import junit.framework.TestCase; |
| |
| /** |
| * Tests for {@link DefaultMomentum}. |
| */ |
| public class DefaultMomentumTest extends TestCase { |
| |
| /** |
| * Test updating the state before the acceleration falls below the minimum |
| * acceleration. |
| */ |
| public void testUpdateStateFast() { |
| DefaultMomentum momentum = new DefaultMomentum(); |
| State state = momentum.createState(new Point(0.0, 0.0), new Point(1.0, 2.0)); |
| state.setPosition(new Point(0.1, 0.2)); |
| state.setCumulativeElapsedMillis(10); |
| state.setElapsedMillis(5); |
| |
| assertTrue(momentum.updateState(state)); |
| |
| // Check the new velocity. |
| Point velocity = state.getVelocity(); |
| assertEquals(0.99302, velocity.getX(), 0.000009); // 1.0 * .9993 ^ 10 |
| assertEquals(1.98604, velocity.getY(), 0.000009); // 2.0 * .9993 ^ 10 |
| |
| // Check the new position. |
| Point position = state.getPosition(); |
| assertEquals(5.0651, position.getX(), 0.0001); // .1 + v * 5ms |
| assertEquals(10.1302, position.getY(), 0.0001); // .2 + v * 5ms5 |
| } |
| |
| /** |
| * Test updating the state after the X acceleration falls below the minimum |
| * acceleration. |
| */ |
| public void testUpdateStateSlowX() { |
| DefaultMomentum momentum = new DefaultMomentum(); |
| State state = momentum.createState(new Point(0.0, 0.0), new Point(0.005, 1.0)); |
| state.setPosition(new Point(0.2, 0.1)); |
| state.setCumulativeElapsedMillis(10); |
| state.setElapsedMillis(5); |
| |
| assertTrue(momentum.updateState(state)); |
| |
| // Check the new velocity. |
| Point velocity = state.getVelocity(); |
| assertEquals(0.0025, velocity.getX(), 0.0001); // 0.005 - 0.0005 * 5 |
| assertEquals(0.99302, velocity.getY(), 0.000009); // 1.0 * .9993 ^ 10 |
| |
| // Check the new position. |
| Point position = state.getPosition(); |
| assertEquals(0.2125, position.getX(), 0.0001); // .2 + v * 5ms |
| assertEquals(5.0651, position.getY(), 0.0001); // .1 + v * 5ms |
| } |
| |
| /** |
| * Test updating the state after the Y acceleration falls below the minimum |
| * acceleration. |
| */ |
| public void testUpdateStateSlowY() { |
| DefaultMomentum momentum = new DefaultMomentum(); |
| State state = momentum.createState(new Point(0.0, 0.0), new Point(1.0, 0.005)); |
| state.setPosition(new Point(0.1, 0.2)); |
| state.setCumulativeElapsedMillis(10); |
| state.setElapsedMillis(5); |
| |
| assertTrue(momentum.updateState(state)); |
| |
| // Check the new velocity. |
| Point velocity = state.getVelocity(); |
| assertEquals(0.99302, velocity.getX(), 0.000009); // 1.0 * .9993 ^ 10 |
| assertEquals(0.0025, velocity.getY(), 0.0001); // 0.005 - 0.0005 * 5 |
| |
| // Check the new position. |
| Point position = state.getPosition(); |
| assertEquals(5.0651, position.getX(), 0.0001); // .1 + v * 5ms |
| assertEquals(0.2125, position.getY(), 0.0001); // .2 + v * 5ms |
| } |
| |
| /** |
| * Test updating the state returns null when we reach the minimum velocity. |
| */ |
| public void testUpdateStateMinimumVelociy() { |
| DefaultMomentum momentum = new DefaultMomentum(); |
| State state = momentum.createState(new Point(0.0, 0.0), new Point(0.02, 0.02)); |
| state.setPosition(new Point(0.1, 0.2)); |
| state.setCumulativeElapsedMillis(10); |
| state.setElapsedMillis(5); |
| |
| assertFalse(momentum.updateState(state)); |
| } |
| } |