Source Code Cross Referenced for LevelRenderer.java in  » Chart » jfreechart » org » jfree » chart » renderer » category » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Chart » jfreechart » org.jfree.chart.renderer.category 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /* ===========================================================
002:         * JFreeChart : a free chart library for the Java(tm) platform
003:         * ===========================================================
004:         *
005:         * (C) Copyright 2000-2007, 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:         * LevelRenderer.java
029:         * ------------------
030:         * (C) Copyright 2004-2007, by Object Refinery Limited.
031:         *
032:         * Original Author:  David Gilbert (for Object Refinery Limited);
033:         * Contributor(s):   -;
034:         *
035:         * $Id: LevelRenderer.java,v 1.7.2.4 2007/06/01 15:12:15 mungady Exp $
036:         *
037:         * Changes
038:         * -------
039:         * 09-Jan-2004 : Version 1 (DG);
040:         * 05-Nov-2004 : Modified drawItem() signature (DG);
041:         * 20-Apr-2005 : Renamed CategoryLabelGenerator 
042:         *               --> CategoryItemLabelGenerator (DG);
043:         * ------------- JFREECHART 1.0.0 ---------------------------------------------
044:         * 23-Jan-2006 : Renamed getMaxItemWidth() --> getMaximumItemWidth() (DG);
045:         * 
046:         */
047:
048:        package org.jfree.chart.renderer.category;
049:
050:        import java.awt.Graphics2D;
051:        import java.awt.Paint;
052:        import java.awt.Stroke;
053:        import java.awt.geom.Line2D;
054:        import java.awt.geom.Rectangle2D;
055:        import java.io.Serializable;
056:
057:        import org.jfree.chart.axis.CategoryAxis;
058:        import org.jfree.chart.axis.ValueAxis;
059:        import org.jfree.chart.entity.CategoryItemEntity;
060:        import org.jfree.chart.entity.EntityCollection;
061:        import org.jfree.chart.event.RendererChangeEvent;
062:        import org.jfree.chart.labels.CategoryItemLabelGenerator;
063:        import org.jfree.chart.labels.CategoryToolTipGenerator;
064:        import org.jfree.chart.plot.CategoryPlot;
065:        import org.jfree.chart.plot.PlotOrientation;
066:        import org.jfree.chart.plot.PlotRenderingInfo;
067:        import org.jfree.data.category.CategoryDataset;
068:        import org.jfree.ui.RectangleEdge;
069:        import org.jfree.util.PublicCloneable;
070:
071:        /**
072:         * A {@link CategoryItemRenderer} that draws individual data items as 
073:         * horizontal lines, spaced in the same way as bars in a bar chart.
074:         */
075:        public class LevelRenderer extends AbstractCategoryItemRenderer
076:                implements  Cloneable, PublicCloneable, Serializable {
077:
078:            /** For serialization. */
079:            private static final long serialVersionUID = -8204856624355025117L;
080:
081:            /** The default item margin percentage. */
082:            public static final double DEFAULT_ITEM_MARGIN = 0.20;
083:
084:            /** The margin between items within a category. */
085:            private double itemMargin;
086:
087:            /** The maximum item width as a percentage of the available space. */
088:            private double maxItemWidth;
089:
090:            /**
091:             * Creates a new renderer with default settings.
092:             */
093:            public LevelRenderer() {
094:                super ();
095:                this .itemMargin = DEFAULT_ITEM_MARGIN;
096:                this .maxItemWidth = 1.0; // 100 percent, so it will not apply unless 
097:                // changed
098:            }
099:
100:            /**
101:             * Returns the item margin.
102:             *
103:             * @return The margin.
104:             */
105:            public double getItemMargin() {
106:                return this .itemMargin;
107:            }
108:
109:            /**
110:             * Sets the item margin.  The value is expressed as a percentage of the 
111:             * available width for plotting all the bars, with the resulting amount to 
112:             * be distributed between all the bars evenly.
113:             *
114:             * @param percent  the new margin.
115:             */
116:            public void setItemMargin(double percent) {
117:                this .itemMargin = percent;
118:                notifyListeners(new RendererChangeEvent(this ));
119:            }
120:
121:            /**
122:             * Returns the maximum width, as a percentage of the available drawing 
123:             * space.
124:             * 
125:             * @return The maximum width.
126:             * 
127:             * @deprecated Use {@link #getMaximumItemWidth()} instead.
128:             */
129:            public double getMaxItemWidth() {
130:                return this .maxItemWidth;
131:            }
132:
133:            /**
134:             * Sets the maximum item width, which is specified as a percentage of the 
135:             * available space for all items, and sends a {@link RendererChangeEvent} 
136:             * to all registered listeners.
137:             * 
138:             * @param percent  the percent.
139:             * 
140:             * @deprecated Use {@link #setMaximumItemWidth(double)} instead.
141:             */
142:            public void setMaxItemWidth(double percent) {
143:                this .maxItemWidth = percent;
144:                notifyListeners(new RendererChangeEvent(this ));
145:            }
146:
147:            /**
148:             * Returns the maximum width, as a percentage of the available drawing 
149:             * space.
150:             * 
151:             * @return The maximum width.
152:             */
153:            public double getMaximumItemWidth() {
154:                return getMaxItemWidth();
155:            }
156:
157:            /**
158:             * Sets the maximum item width, which is specified as a percentage of the 
159:             * available space for all items, and sends a {@link RendererChangeEvent} 
160:             * to all registered listeners.
161:             * 
162:             * @param percent  the percent.
163:             */
164:            public void setMaximumItemWidth(double percent) {
165:                setMaxItemWidth(percent);
166:            }
167:
168:            /**
169:             * Initialises the renderer and returns a state object that will be passed 
170:             * to subsequent calls to the drawItem method.
171:             * <p>
172:             * This method gets called once at the start of the process of drawing a 
173:             * chart.
174:             *
175:             * @param g2  the graphics device.
176:             * @param dataArea  the area in which the data is to be plotted.
177:             * @param plot  the plot.
178:             * @param rendererIndex  the renderer index.
179:             * @param info  collects chart rendering information for return to caller.
180:             * 
181:             * @return The renderer state.
182:             *
183:             */
184:            public CategoryItemRendererState initialise(Graphics2D g2,
185:                    Rectangle2D dataArea, CategoryPlot plot, int rendererIndex,
186:                    PlotRenderingInfo info) {
187:
188:                CategoryItemRendererState state = super .initialise(g2,
189:                        dataArea, plot, rendererIndex, info);
190:                calculateItemWidth(plot, dataArea, rendererIndex, state);
191:                return state;
192:
193:            }
194:
195:            /**
196:             * Calculates the bar width and stores it in the renderer state.
197:             * 
198:             * @param plot  the plot.
199:             * @param dataArea  the data area.
200:             * @param rendererIndex  the renderer index.
201:             * @param state  the renderer state.
202:             */
203:            protected void calculateItemWidth(CategoryPlot plot,
204:                    Rectangle2D dataArea, int rendererIndex,
205:                    CategoryItemRendererState state) {
206:
207:                CategoryAxis domainAxis = getDomainAxis(plot, rendererIndex);
208:                CategoryDataset dataset = plot.getDataset(rendererIndex);
209:                if (dataset != null) {
210:                    int columns = dataset.getColumnCount();
211:                    int rows = dataset.getRowCount();
212:                    double space = 0.0;
213:                    PlotOrientation orientation = plot.getOrientation();
214:                    if (orientation == PlotOrientation.HORIZONTAL) {
215:                        space = dataArea.getHeight();
216:                    } else if (orientation == PlotOrientation.VERTICAL) {
217:                        space = dataArea.getWidth();
218:                    }
219:                    double maxWidth = space * getMaxItemWidth();
220:                    double categoryMargin = 0.0;
221:                    double currentItemMargin = 0.0;
222:                    if (columns > 1) {
223:                        categoryMargin = domainAxis.getCategoryMargin();
224:                    }
225:                    if (rows > 1) {
226:                        currentItemMargin = getItemMargin();
227:                    }
228:                    double used = space
229:                            * (1 - domainAxis.getLowerMargin()
230:                                    - domainAxis.getUpperMargin()
231:                                    - categoryMargin - currentItemMargin);
232:                    if ((rows * columns) > 0) {
233:                        state.setBarWidth(Math.min(used / (rows * columns),
234:                                maxWidth));
235:                    } else {
236:                        state.setBarWidth(Math.min(used, maxWidth));
237:                    }
238:                }
239:            }
240:
241:            /**
242:             * Calculates the coordinate of the first "side" of a bar.  This will be 
243:             * the minimum x-coordinate for a vertical bar, and the minimum 
244:             * y-coordinate for a horizontal bar.
245:             * 
246:             * @param plot  the plot.
247:             * @param orientation  the plot orientation.
248:             * @param dataArea  the data area.
249:             * @param domainAxis  the domain axis.
250:             * @param state  the renderer state (has the bar width precalculated).
251:             * @param row  the row index.
252:             * @param column  the column index.
253:             * 
254:             * @return The coordinate.
255:             */
256:            protected double calculateBarW0(CategoryPlot plot,
257:                    PlotOrientation orientation, Rectangle2D dataArea,
258:                    CategoryAxis domainAxis, CategoryItemRendererState state,
259:                    int row, int column) {
260:                // calculate bar width...
261:                double space = 0.0;
262:                if (orientation == PlotOrientation.HORIZONTAL) {
263:                    space = dataArea.getHeight();
264:                } else {
265:                    space = dataArea.getWidth();
266:                }
267:                double barW0 = domainAxis.getCategoryStart(column,
268:                        getColumnCount(), dataArea, plot.getDomainAxisEdge());
269:                int seriesCount = getRowCount();
270:                int categoryCount = getColumnCount();
271:                if (seriesCount > 1) {
272:                    double seriesGap = space * getItemMargin()
273:                            / (categoryCount * (seriesCount - 1));
274:                    double seriesW = calculateSeriesWidth(space, domainAxis,
275:                            categoryCount, seriesCount);
276:                    barW0 = barW0 + row * (seriesW + seriesGap)
277:                            + (seriesW / 2.0) - (state.getBarWidth() / 2.0);
278:                } else {
279:                    barW0 = domainAxis.getCategoryMiddle(column,
280:                            getColumnCount(), dataArea, plot
281:                                    .getDomainAxisEdge())
282:                            - state.getBarWidth() / 2.0;
283:                }
284:                return barW0;
285:            }
286:
287:            /**
288:             * Draws the bar for a single (series, category) data item.
289:             *
290:             * @param g2  the graphics device.
291:             * @param state  the renderer state.
292:             * @param dataArea  the data area.
293:             * @param plot  the plot.
294:             * @param domainAxis  the domain axis.
295:             * @param rangeAxis  the range axis.
296:             * @param dataset  the dataset.
297:             * @param row  the row index (zero-based).
298:             * @param column  the column index (zero-based).
299:             * @param pass  the pass index.
300:             */
301:            public void drawItem(Graphics2D g2,
302:                    CategoryItemRendererState state, Rectangle2D dataArea,
303:                    CategoryPlot plot, CategoryAxis domainAxis,
304:                    ValueAxis rangeAxis, CategoryDataset dataset, int row,
305:                    int column, int pass) {
306:
307:                // nothing is drawn for null values...
308:                Number dataValue = dataset.getValue(row, column);
309:                if (dataValue == null) {
310:                    return;
311:                }
312:
313:                double value = dataValue.doubleValue();
314:
315:                PlotOrientation orientation = plot.getOrientation();
316:                double barW0 = calculateBarW0(plot, orientation, dataArea,
317:                        domainAxis, state, row, column);
318:                RectangleEdge edge = plot.getRangeAxisEdge();
319:                double barL = rangeAxis.valueToJava2D(value, dataArea, edge);
320:
321:                // draw the bar...
322:                Line2D line = null;
323:                double x = 0.0;
324:                double y = 0.0;
325:                if (orientation == PlotOrientation.HORIZONTAL) {
326:                    x = barL;
327:                    y = barW0 + state.getBarWidth() / 2.0;
328:                    line = new Line2D.Double(barL, barW0, barL, barW0
329:                            + state.getBarWidth());
330:                } else {
331:                    x = barW0 + state.getBarWidth() / 2.0;
332:                    y = barL;
333:                    line = new Line2D.Double(barW0, barL, barW0
334:                            + state.getBarWidth(), barL);
335:                }
336:                Stroke itemStroke = getItemStroke(row, column);
337:                Paint itemPaint = getItemPaint(row, column);
338:                g2.setStroke(itemStroke);
339:                g2.setPaint(itemPaint);
340:                g2.draw(line);
341:
342:                CategoryItemLabelGenerator generator = getItemLabelGenerator(
343:                        row, column);
344:                if (generator != null && isItemLabelVisible(row, column)) {
345:                    drawItemLabel(g2, orientation, dataset, row, column, x, y,
346:                            (value < 0.0));
347:                }
348:
349:                // collect entity and tool tip information...
350:                if (state.getInfo() != null) {
351:                    EntityCollection entities = state.getEntityCollection();
352:                    if (entities != null) {
353:                        String tip = null;
354:                        CategoryToolTipGenerator tipster = getToolTipGenerator(
355:                                row, column);
356:                        if (tipster != null) {
357:                            tip = tipster.generateToolTip(dataset, row, column);
358:                        }
359:                        String url = null;
360:                        if (getItemURLGenerator(row, column) != null) {
361:                            url = getItemURLGenerator(row, column).generateURL(
362:                                    dataset, row, column);
363:                        }
364:                        CategoryItemEntity entity = new CategoryItemEntity(line
365:                                .getBounds(), tip, url, dataset, dataset
366:                                .getRowKey(row), dataset.getColumnKey(column));
367:                        entities.add(entity);
368:                    }
369:
370:                }
371:
372:            }
373:
374:            /**
375:             * Calculates the available space for each series.
376:             * 
377:             * @param space  the space along the entire axis (in Java2D units).
378:             * @param axis  the category axis.
379:             * @param categories  the number of categories.
380:             * @param series  the number of series.
381:             * 
382:             * @return The width of one series.
383:             */
384:            protected double calculateSeriesWidth(double space,
385:                    CategoryAxis axis, int categories, int series) {
386:                double factor = 1.0 - getItemMargin() - axis.getLowerMargin()
387:                        - axis.getUpperMargin();
388:                if (categories > 1) {
389:                    factor = factor - axis.getCategoryMargin();
390:                }
391:                return (space * factor) / (categories * series);
392:            }
393:
394:            /**
395:             * Tests an object for equality with this instance.
396:             * 
397:             * @param obj  the object (<code>null</code> permitted).
398:             * 
399:             * @return A boolean.
400:             */
401:            public boolean equals(Object obj) {
402:                if (obj == this ) {
403:                    return true;
404:                }
405:                if (!(obj instanceof  LevelRenderer)) {
406:                    return false;
407:                }
408:                if (!super .equals(obj)) {
409:                    return false;
410:                }
411:                LevelRenderer that = (LevelRenderer) obj;
412:                if (this .itemMargin != that.itemMargin) {
413:                    return false;
414:                }
415:                if (this .maxItemWidth != that.maxItemWidth) {
416:                    return false;
417:                }
418:                return true;
419:            }
420:
421:        }
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