001 package com.croftsoft.apps.sprite;
002
003 import java.awt.Color;
004 import java.awt.Rectangle;
005 import java.util.Random;
006 import javax.swing.JComponent;
007
008 import com.croftsoft.core.animation.Clock;
009 import com.croftsoft.core.animation.ComponentUpdater;
010 import com.croftsoft.core.animation.painter.ColorPainter;
011 import com.croftsoft.core.lang.NullArgumentException;
012
013 /*********************************************************************
014 * Updates scene shading for fog and night and changes brick color.
015 *
016 * @version
017 * 2002-12-05
018 * @since
019 * 2002-02-20
020 * @author
021 * <a href="https://www.croftsoft.com/">David Wallace Croft</a>
022 *********************************************************************/
023
024 public final class FogNightUpdater
025 implements ComponentUpdater
026 //////////////////////////////////////////////////////////////////////
027 //////////////////////////////////////////////////////////////////////
028 {
029
030 private static final long NANOSECONDS_PER_SECOND = 1000000000L;
031
032 private final ColorPainter fogNightPainter;
033
034 private final ColorPainter brickColorPainter;
035
036 private final long fullCyclePeriodNanos;
037
038 private final Clock clock;
039
040 private final Color [ ] fogColors;
041
042 private final Color [ ] nightColors;
043
044 private final Random brickColorRandom;
045
046 //
047
048 private long offsetTime;
049
050 private int oldIndex;
051
052 //////////////////////////////////////////////////////////////////////
053 //////////////////////////////////////////////////////////////////////
054
055 public FogNightUpdater (
056 ColorPainter fogNightPainter,
057 ColorPainter brickColorPainter,
058 int fullCyclePeriod,
059 Clock clock )
060 //////////////////////////////////////////////////////////////////////
061 {
062 NullArgumentException.check (
063 this.fogNightPainter = fogNightPainter );
064
065 NullArgumentException.check (
066 this.brickColorPainter = brickColorPainter );
067
068 if ( fullCyclePeriod < 1 )
069 {
070 throw new IllegalArgumentException ( "fullCyclePeriod < 1" );
071 }
072
073 NullArgumentException.check ( this.clock = clock );
074
075 this.fullCyclePeriodNanos
076 = NANOSECONDS_PER_SECOND * fullCyclePeriod;
077
078 nightColors = new Color [ 256 ];
079
080 fogColors = new Color [ 256 ];
081
082 for ( int alpha = 0; alpha < 256; alpha++ )
083 {
084 nightColors [ alpha ] = new Color ( 0, 0, 0, alpha );
085
086 fogColors [ alpha ] = new Color ( 255, 255, 255, alpha );
087 }
088
089 brickColorRandom = new Random ( );
090
091 oldIndex = -1; // out of range, force an immediate Color update
092
093 reset ( );
094 }
095
096 //////////////////////////////////////////////////////////////////////
097 //////////////////////////////////////////////////////////////////////
098
099 public void reset ( )
100 //////////////////////////////////////////////////////////////////////
101 {
102 offsetTime = -1;
103 }
104
105 public void update ( JComponent component )
106 //////////////////////////////////////////////////////////////////////
107 {
108 long updateTimeNanos = clock.currentTimeNanos ( );
109
110 if ( offsetTime < 0 )
111 {
112 offsetTime = updateTimeNanos;
113 }
114
115 int index = ( int )
116 ( ( ( ( updateTimeNanos - offsetTime ) % fullCyclePeriodNanos )
117 * ( 256 * 6 ) ) / fullCyclePeriodNanos );
118
119 if ( index == oldIndex )
120 {
121 return;
122 }
123
124 if ( index < oldIndex )
125 {
126 brickColorPainter.setColor (
127 new Color (
128 brickColorRandom.nextInt ( 256 ),
129 brickColorRandom.nextInt ( 256 ),
130 brickColorRandom.nextInt ( 256 ) ) );
131 }
132
133 oldIndex = index;
134
135 int phase = index / 256;
136
137 index = index % 256;
138
139 Color fogNightColor = null;
140
141 if ( phase == 0 )
142 {
143 // going from night to day
144
145 fogNightColor = nightColors [ 255 - index ];
146 }
147 else if ( phase == 1 )
148 {
149 // day
150
151 fogNightColor = nightColors [ 0 ];
152 }
153 else if ( phase == 2 )
154 {
155 // going from day to fog
156
157 fogNightColor = fogColors [ index ];
158 }
159 else if ( phase == 3 )
160 {
161 // going from fog to day
162
163 fogNightColor = fogColors [ 255 - index ];
164 }
165 else if ( phase == 4 )
166 {
167 // day
168
169 fogNightColor = fogColors [ 0 ];
170 }
171 else if ( phase == 5 )
172 {
173 // going from day to night
174
175 fogNightColor = nightColors [ index ];
176 }
177
178 fogNightPainter.setColor ( fogNightColor );
179
180 component.repaint ( );
181 }
182
183 //////////////////////////////////////////////////////////////////////
184 //////////////////////////////////////////////////////////////////////
185 }