test/org/sourceforge/desert/ParticleUpdaterTest.java

   1 /*
   2  * Copyright (c) 2010 The Desert team
   3  *
   4  * Permission is hereby granted, free of charge, to any person
   5  * obtaining a copy of this software and associated documentation
   6  * files (the "Software"), to deal in the Software without
   7  * restriction, including without limitation the rights to use,
   8  * copy, modify, merge, publish, distribute, sublicense, and/or sell
   9  * copies of the Software, and to permit persons to whom the
  10  * Software is furnished to do so, subject to the following
  11  * conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be
  14  * included in all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  17  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
  18  * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  19  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
  20  * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
  21  * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  22  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  23  * OTHER DEALINGS IN THE SOFTWARE.
  24  *
  25  */
  26 package org.sourceforge.desert;
  27
  28 import java.awt.Rectangle;
  29 import java.util.Arrays;
  30 import java.util.List;
  31 import java.awt.Color;
  32 import org.junit.Test;
  33
  34 import static org.junit.Assert.*;
  35
  36 /**
  37  *
  38  * @author codistmonk (creation 2010-04-13)
  39  */
  40 public final class ParticleUpdaterTest {
  41
  42     @Test
  43     public final void testUpdateWithoutBounds() {
  44         final Double x = 0.0;
  45         final Double y = 2.0;
  46         final Double speedX = 3.0;
  47         final Double speedY = 5.0;
  48         final Particle particle = new Particle(x, y, speedX, speedY, Color.blue);
  49         final List<Particle> particles = Arrays.asList(particle);
  50         final Double deltaTime = 7.0;
  51         final ParticleUpdater particleUpdater = new ParticleUpdater(particles);
  52
  53         particleUpdater.update(deltaTime);
  54
  55         assertEquals(x + speedX * deltaTime, particle.getX(), DELTA);
  56         assertEquals(y + speedY * deltaTime + particleUpdater.getGravity() * deltaTime * deltaTime, particle.getY(), DELTA);
  57         assertEquals(speedX, particle.getSpeedX(), DELTA);
  58         assertEquals(speedY + particleUpdater.getGravity() * deltaTime, particle.getSpeedY(), DELTA);
  59     }
  60
  61     @Test
  62     public final void testUpdateWithBottomBound() {
  63         final Double x = 5.0;
  64         final Double y = 4.0;
  65         final Double speedX = 1.0;
  66         final Double speedY = 5.0; // Go downward in screen coordinates
  67         final Particle particle = new Particle(x, y, speedX, speedY, Color.red);
  68         final List<Particle> particles = Arrays.asList(particle);
  69         final Double deltaTime = 2.0;
  70         final ParticleUpdater particleUpdater = new ParticleUpdater(particles);
  71         final Integer width = 10;
  72         final Integer height = 10;
  73         particleUpdater.setBounds(new Rectangle(width, height));
  74         particleUpdater.setGravity(0.0);
  75
  76         particleUpdater.update(deltaTime);
  77
  78         assertEquals(x + speedX * deltaTime, particle.getX(), DELTA);
  79         assertEquals(height - 1.0, particle.getY(), DELTA);
  80         assertEquals(speedX, particle.getSpeedX(), DELTA);
  81         assertEquals(0.0, particle.getSpeedY(), DELTA);
  82     }
  83
  84     @Test
  85     public final void testUpdateWithTopBound() {
  86         final Double x = 5.0;
  87         final Double y = 4.0;
  88         final Double speedX = 1.0;
  89         final Double speedY = -5.0; // Go upward in screen coordinates
  90         final Particle particle = new Particle(x, y, speedX, speedY, Color.green);
  91         final List<Particle> particles = Arrays.asList(particle);
  92         final Double deltaTime = 2.0;
  93         final ParticleUpdater particleUpdater = new ParticleUpdater(particles);
  94         final Integer width = 10;
  95         final Integer height = 10;
  96         particleUpdater.setBounds(new Rectangle(width, height));
  97         particleUpdater.setGravity(0.0);
  98
  99         particleUpdater.update(deltaTime);
 100
 101         assertEquals(x + speedX * deltaTime, particle.getX(), DELTA);
 102         assertEquals(0.0, particle.getY(), DELTA);
 103         assertEquals(speedX, particle.getSpeedX(), DELTA);
 104         assertEquals(0.0, particle.getSpeedY(), DELTA);
 105     }
 106
 107     @Test
 108     public final void testUpdateWithLeftBound() {
 109         final Double x = 5.0;
 110         final Double y = 4.0;
 111         final Double speedX = -5.0;
 112         final Double speedY = 1.0;
 113         final Particle particle = new Particle(x, y, speedX, speedY, Color.yellow);
 114         final List<Particle> particles = Arrays.asList(particle);
 115         final Double deltaTime = 2.0;
 116         final ParticleUpdater particleUpdater = new ParticleUpdater(particles);
 117         final Integer width = 10;
 118         final Integer height = 10;
 119         particleUpdater.setBounds(new Rectangle(width, height));
 120         particleUpdater.setGravity(0.0);
 121
 122         particleUpdater.update(deltaTime);
 123
 124         assertEquals(0.0, particle.getX(), DELTA);
 125         assertEquals(y + speedY * deltaTime, particle.getY(), DELTA);
 126         assertEquals(0.0, particle.getSpeedX(), DELTA);
 127         assertEquals(speedY, particle.getSpeedY(), DELTA);
 128     }
 129
 130     @Test
 131     public final void testUpdateWithRightBound() {
 132         final Double x = 5.0;
 133         final Double y = 4.0;
 134         final Double speedX = 5.0;
 135         final Double speedY = 1.0;
 136         final Particle particle = new Particle(x, y, speedX, speedY, Color.CYAN);
 137         final List<Particle> particles = Arrays.asList(particle);
 138         final Double deltaTime = 2.0;
 139         final ParticleUpdater particleUpdater = new ParticleUpdater(particles);
 140         final Integer width = 10;
 141         final Integer height = 10;
 142         particleUpdater.setBounds(new Rectangle(width, height));
 143         particleUpdater.setGravity(0.0);
 144
 145         particleUpdater.update(deltaTime);
 146
 147         assertEquals(width - 1.0, particle.getX(), DELTA);
 148         assertEquals(y + speedY * deltaTime, particle.getY(), DELTA);
 149         assertEquals(0.0, particle.getSpeedX(), DELTA);
 150         assertEquals(speedY, particle.getSpeedY(), DELTA);
 151     }
 152
 153     private static final Double DELTA = 1e-12;
 154
 155 }