001 package com.croftsoft.apps.mars.model.seri;
002
003 import java.awt.*;
004 import java.awt.geom.Ellipse2D;
005 import java.util.Random;
006
007 import com.croftsoft.core.lang.NullArgumentException;
008 import com.croftsoft.core.math.geom.Circle;
009 import com.croftsoft.core.math.geom.PointXY;
010
011 import com.croftsoft.apps.mars.model.Obstacle;
012 import com.croftsoft.apps.mars.model.World;
013
014 /*********************************************************************
015 * An obstacle.
016 *
017 * @version
018 * 2003-05-11
019 * @since
020 * 2003-03-30
021 * @author
022 * <a href="https://www.croftsoft.com/">David Wallace Croft</a>
023 *********************************************************************/
024
025 public final class SeriObstacle
026 extends SeriModel
027 implements Obstacle
028 //////////////////////////////////////////////////////////////////////
029 //////////////////////////////////////////////////////////////////////
030 {
031
032 private static final long serialVersionUID = 0L;
033
034 //
035
036 private static final double Z = 0.2;
037
038 private static final double DRIFT_RATE = 1.0;
039
040 private static final double SPEED_MAX = 1.0;
041
042 //
043
044 private final World world;
045
046 private final Circle circle;
047
048 private final Random random;
049
050 private final Rectangle driftBounds;
051
052 private final double radiusMin;
053
054 //
055
056 private boolean active;
057
058 private boolean updated;
059
060 private double velocityX;
061
062 private double velocityY;
063
064 //////////////////////////////////////////////////////////////////////
065 // constructor methods
066 //////////////////////////////////////////////////////////////////////
067
068 public SeriObstacle (
069 World world,
070 double centerX,
071 double centerY,
072 double radius,
073 double radiusMin,
074 Random random,
075 Rectangle driftBounds )
076 //////////////////////////////////////////////////////////////////////
077 {
078 NullArgumentException.check ( this.world = world );
079
080 circle = new Circle ( centerX, centerY, radius );
081
082 this.radiusMin = radiusMin;
083
084 NullArgumentException.check ( this.random = random );
085
086 NullArgumentException.check ( this.driftBounds = driftBounds );
087
088 active = true;
089
090 updated = true;
091 }
092
093 //////////////////////////////////////////////////////////////////////
094 // interface Model methods
095 //////////////////////////////////////////////////////////////////////
096
097 public boolean isActive ( ) { return active; }
098
099 public Shape getShape ( ) { return circle; }
100
101 public boolean isUpdated ( ) { return updated; }
102
103 public double getZ ( ) { return Z; }
104
105 public void setCenter (
106 double x,
107 double y )
108 //////////////////////////////////////////////////////////////////////
109 {
110 circle.setCenter ( x, y );
111 }
112
113 public void prepare ( )
114 //////////////////////////////////////////////////////////////////////
115 {
116 updated = false;
117 }
118
119 public void update ( double timeDelta )
120 //////////////////////////////////////////////////////////////////////
121 {
122 if ( !active )
123 {
124 return;
125 }
126
127 velocityX
128 += DRIFT_RATE * timeDelta * ( 2.0 * random.nextDouble ( ) - 1.0 );
129
130 velocityY
131 += DRIFT_RATE * timeDelta * ( 2.0 * random.nextDouble ( ) - 1.0 );
132
133 if ( velocityX > SPEED_MAX )
134 {
135 velocityX = SPEED_MAX;
136 }
137 else if ( velocityX < -SPEED_MAX )
138 {
139 velocityX = -SPEED_MAX;
140 }
141
142 if ( velocityY > SPEED_MAX )
143 {
144 velocityY = SPEED_MAX;
145 }
146 else if ( velocityY < -SPEED_MAX )
147 {
148 velocityY = -SPEED_MAX;
149 }
150
151 PointXY center = circle.getCenter ( );
152
153 double oldCenterX = center.getX ( );
154
155 double oldCenterY = center.getY ( );
156
157 double destinationX = oldCenterX + velocityX * timeDelta;
158
159 double destinationY = oldCenterY + velocityY * timeDelta;
160
161 double radius = circle.getRadius ( );
162
163 double minX = driftBounds.getX ( ) + radius;
164
165 double minY = driftBounds.getY ( ) + radius;
166
167 double maxX = driftBounds.getWidth ( ) - radius;
168
169 double maxY = driftBounds.getHeight ( ) - radius;
170
171 if ( destinationX < minX )
172 {
173 destinationX = minX;
174
175 velocityX = -velocityX;
176 }
177 else if ( destinationX > maxX )
178 {
179 destinationX = maxX;
180
181 velocityX = -velocityX;
182 }
183
184 if ( destinationY < minY )
185 {
186 destinationY = minY;
187
188 velocityY = -velocityY;
189 }
190 else if ( destinationY > maxY )
191 {
192 destinationY = maxY;
193
194 velocityY = -velocityY;
195 }
196
197 if ( ( destinationX != oldCenterX )
198 || ( destinationY != oldCenterY ) )
199 {
200 circle.setCenter ( destinationX, destinationY );
201
202 if ( world.isBlocked ( this ) )
203 {
204 circle.setCenter ( oldCenterX, oldCenterY );
205 }
206 else
207 {
208 updated = true;
209 }
210 }
211 }
212
213 //////////////////////////////////////////////////////////////////////
214 // interface Damageable method
215 //////////////////////////////////////////////////////////////////////
216
217 public void addDamage ( double damage )
218 //////////////////////////////////////////////////////////////////////
219 {
220 if ( !active
221 || ( damage == 0.0 ) )
222 {
223 return;
224 }
225
226 updated = true;
227
228 double radius = circle.getRadius ( ) - damage;
229
230 if ( radius < radiusMin )
231 {
232 active = false;
233 }
234 else
235 {
236 circle.setRadius ( radius );
237 }
238 }
239
240 //////////////////////////////////////////////////////////////////////
241 // interface Obstacle methods
242 //////////////////////////////////////////////////////////////////////
243
244 public void setActive ( boolean active )
245 //////////////////////////////////////////////////////////////////////
246 {
247 this.active = active;
248 }
249
250 public void setRadius ( double radius )
251 //////////////////////////////////////////////////////////////////////
252 {
253 circle.setRadius ( radius );
254 }
255
256 //////////////////////////////////////////////////////////////////////
257 //////////////////////////////////////////////////////////////////////
258 }