001 /* ===========================================================
002 * JFreeChart : a free chart library for the Java(tm) platform
003 * ===========================================================
004 *
005 * (C) Copyright 2000-2008, by Object Refinery Limited and Contributors.
006 *
007 * Project Info: http://www.jfree.org/jfreechart/index.html
008 *
009 * This library is free software; you can redistribute it and/or modify it
010 * under the terms of the GNU Lesser General Public License as published by
011 * the Free Software Foundation; either version 2.1 of the License, or
012 * (at your option) any later version.
013 *
014 * This library is distributed in the hope that it will be useful, but
015 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
016 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
017 * License for more details.
018 *
019 * You should have received a copy of the GNU Lesser General Public
020 * License along with this library; if not, write to the Free Software
021 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
022 * USA.
023 *
024 * [Java is a trademark or registered trademark of Sun Microsystems, Inc.
025 * in the United States and other countries.]
026 *
027 * ----------------------
028 * CenterArrangement.java
029 * ----------------------
030 * (C) Copyright 2005-2008, by Object Refinery Limited.
031 *
032 * Original Author: David Gilbert (for Object Refinery Limited);
033 * Contributor(s): -;
034 *
035 * Changes:
036 * --------
037 * 08-Mar-2005 : Version 1 (DG);
038 * ------------- JFREECHART 1.0.x ---------------------------------------------
039 * 20-Jul-2006 : Set bounds of contained block when arranging (DG);
040 *
041 */
042
043 package org.jfree.chart.block;
044
045 import java.awt.Graphics2D;
046 import java.awt.geom.Rectangle2D;
047 import java.io.Serializable;
048 import java.util.List;
049
050 import org.jfree.ui.Size2D;
051
052 /**
053 * Arranges a block in the center of its container. This class is immutable.
054 */
055 public class CenterArrangement implements Arrangement, Serializable {
056
057 /** For serialization. */
058 private static final long serialVersionUID = -353308149220382047L;
059
060 /**
061 * Creates a new instance.
062 */
063 public CenterArrangement() {
064 }
065
066 /**
067 * Adds a block to be managed by this instance. This method is usually
068 * called by the {@link BlockContainer}, you shouldn't need to call it
069 * directly.
070 *
071 * @param block the block.
072 * @param key a key that controls the position of the block.
073 */
074 public void add(Block block, Object key) {
075 // since the flow layout is relatively straightforward,
076 // no information needs to be recorded here
077 }
078
079 /**
080 * Calculates and sets the bounds of all the items in the specified
081 * container, subject to the given constraint. The <code>Graphics2D</code>
082 * can be used by some items (particularly items containing text) to
083 * calculate sizing parameters.
084 *
085 * @param container the container whose items are being arranged.
086 * @param g2 the graphics device.
087 * @param constraint the size constraint.
088 *
089 * @return The size of the container after arrangement of the contents.
090 */
091 public Size2D arrange(BlockContainer container, Graphics2D g2,
092 RectangleConstraint constraint) {
093
094 LengthConstraintType w = constraint.getWidthConstraintType();
095 LengthConstraintType h = constraint.getHeightConstraintType();
096 if (w == LengthConstraintType.NONE) {
097 if (h == LengthConstraintType.NONE) {
098 return arrangeNN(container, g2);
099 }
100 else if (h == LengthConstraintType.FIXED) {
101 throw new RuntimeException("Not implemented.");
102 }
103 else if (h == LengthConstraintType.RANGE) {
104 throw new RuntimeException("Not implemented.");
105 }
106 }
107 else if (w == LengthConstraintType.FIXED) {
108 if (h == LengthConstraintType.NONE) {
109 return arrangeFN(container, g2, constraint);
110 }
111 else if (h == LengthConstraintType.FIXED) {
112 throw new RuntimeException("Not implemented.");
113 }
114 else if (h == LengthConstraintType.RANGE) {
115 throw new RuntimeException("Not implemented.");
116 }
117 }
118 else if (w == LengthConstraintType.RANGE) {
119 if (h == LengthConstraintType.NONE) {
120 return arrangeRN(container, g2, constraint);
121 }
122 else if (h == LengthConstraintType.FIXED) {
123 return arrangeRF(container, g2, constraint);
124 }
125 else if (h == LengthConstraintType.RANGE) {
126 return arrangeRR(container, g2, constraint);
127 }
128 }
129 throw new IllegalArgumentException("Unknown LengthConstraintType.");
130
131 }
132
133 /**
134 * Arranges the blocks in the container with a fixed width and no height
135 * constraint.
136 *
137 * @param container the container.
138 * @param g2 the graphics device.
139 * @param constraint the constraint.
140 *
141 * @return The size.
142 */
143 protected Size2D arrangeFN(BlockContainer container, Graphics2D g2,
144 RectangleConstraint constraint) {
145
146 List blocks = container.getBlocks();
147 Block b = (Block) blocks.get(0);
148 Size2D s = b.arrange(g2, RectangleConstraint.NONE);
149 double width = constraint.getWidth();
150 Rectangle2D bounds = new Rectangle2D.Double((width - s.width) / 2.0,
151 0.0, s.width, s.height);
152 b.setBounds(bounds);
153 return new Size2D((width - s.width) / 2.0, s.height);
154 }
155
156 /**
157 * Arranges the blocks in the container with a fixed with and a range
158 * constraint on the height.
159 *
160 * @param container the container.
161 * @param g2 the graphics device.
162 * @param constraint the constraint.
163 *
164 * @return The size following the arrangement.
165 */
166 protected Size2D arrangeFR(BlockContainer container, Graphics2D g2,
167 RectangleConstraint constraint) {
168
169 Size2D s = arrangeFN(container, g2, constraint);
170 if (constraint.getHeightRange().contains(s.height)) {
171 return s;
172 }
173 else {
174 RectangleConstraint c = constraint.toFixedHeight(
175 constraint.getHeightRange().constrain(s.getHeight()));
176 return arrangeFF(container, g2, c);
177 }
178 }
179
180 /**
181 * Arranges the blocks in the container with the overall height and width
182 * specified as fixed constraints.
183 *
184 * @param container the container.
185 * @param g2 the graphics device.
186 * @param constraint the constraint.
187 *
188 * @return The size following the arrangement.
189 */
190 protected Size2D arrangeFF(BlockContainer container, Graphics2D g2,
191 RectangleConstraint constraint) {
192
193 // TODO: implement this properly
194 return arrangeFN(container, g2, constraint);
195 }
196
197 /**
198 * Arranges the blocks with the overall width and height to fit within
199 * specified ranges.
200 *
201 * @param container the container.
202 * @param g2 the graphics device.
203 * @param constraint the constraint.
204 *
205 * @return The size after the arrangement.
206 */
207 protected Size2D arrangeRR(BlockContainer container, Graphics2D g2,
208 RectangleConstraint constraint) {
209
210 // first arrange without constraints, and see if this fits within
211 // the required ranges...
212 Size2D s1 = arrangeNN(container, g2);
213 if (constraint.getWidthRange().contains(s1.width)) {
214 return s1; // TODO: we didn't check the height yet
215 }
216 else {
217 RectangleConstraint c = constraint.toFixedWidth(
218 constraint.getWidthRange().getUpperBound());
219 return arrangeFR(container, g2, c);
220 }
221 }
222
223 /**
224 * Arranges the blocks in the container with a range constraint on the
225 * width and a fixed height.
226 *
227 * @param container the container.
228 * @param g2 the graphics device.
229 * @param constraint the constraint.
230 *
231 * @return The size following the arrangement.
232 */
233 protected Size2D arrangeRF(BlockContainer container, Graphics2D g2,
234 RectangleConstraint constraint) {
235
236 Size2D s = arrangeNF(container, g2, constraint);
237 if (constraint.getWidthRange().contains(s.width)) {
238 return s;
239 }
240 else {
241 RectangleConstraint c = constraint.toFixedWidth(
242 constraint.getWidthRange().constrain(s.getWidth()));
243 return arrangeFF(container, g2, c);
244 }
245 }
246
247 /**
248 * Arranges the block with a range constraint on the width, and no
249 * constraint on the height.
250 *
251 * @param container the container.
252 * @param g2 the graphics device.
253 * @param constraint the constraint.
254 *
255 * @return The size following the arrangement.
256 */
257 protected Size2D arrangeRN(BlockContainer container, Graphics2D g2,
258 RectangleConstraint constraint) {
259 // first arrange without constraints, then see if the width fits
260 // within the required range...if not, call arrangeFN() at max width
261 Size2D s1 = arrangeNN(container, g2);
262 if (constraint.getWidthRange().contains(s1.width)) {
263 return s1;
264 }
265 else {
266 RectangleConstraint c = constraint.toFixedWidth(
267 constraint.getWidthRange().getUpperBound());
268 return arrangeFN(container, g2, c);
269 }
270 }
271
272 /**
273 * Arranges the blocks without any constraints. This puts all blocks
274 * into a single row.
275 *
276 * @param container the container.
277 * @param g2 the graphics device.
278 *
279 * @return The size after the arrangement.
280 */
281 protected Size2D arrangeNN(BlockContainer container, Graphics2D g2) {
282 List blocks = container.getBlocks();
283 Block b = (Block) blocks.get(0);
284 Size2D s = b.arrange(g2, RectangleConstraint.NONE);
285 b.setBounds(new Rectangle2D.Double(0.0, 0.0, s.width, s.height));
286 return new Size2D(s.width, s.height);
287 }
288
289 /**
290 * Arranges the blocks with no width constraint and a fixed height
291 * constraint. This puts all blocks into a single row.
292 *
293 * @param container the container.
294 * @param g2 the graphics device.
295 * @param constraint the constraint.
296 *
297 * @return The size after the arrangement.
298 */
299 protected Size2D arrangeNF(BlockContainer container, Graphics2D g2,
300 RectangleConstraint constraint) {
301 // TODO: for now we are ignoring the height constraint
302 return arrangeNN(container, g2);
303 }
304
305 /**
306 * Clears any cached information.
307 */
308 public void clear() {
309 // no action required.
310 }
311
312 /**
313 * Tests this instance for equality with an arbitrary object.
314 *
315 * @param obj the object (<code>null</code> permitted).
316 *
317 * @return A boolean.
318 */
319 public boolean equals(Object obj) {
320 if (obj == this) {
321 return true;
322 }
323 if (!(obj instanceof CenterArrangement)) {
324 return false;
325 }
326 return true;
327 }
328
329 }