001/* ===========================================================
002 * JFreeChart : a free chart library for the Java(tm) platform
003 * ===========================================================
004 *
005 * (C) Copyright 2000-2020, 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 * [Oracle and Java are registered trademarks of Oracle and/or its affiliates. 
025 * Other names may be trademarks of their respective owners.]
026 *
027 * -------------------------
028 * CategoryStepRenderer.java
029 * -------------------------
030 *
031 * (C) Copyright 2004-2020, by Brian Cole and Contributors.
032 *
033 * Original Author:  Brian Cole;
034 * Contributor(s):   David Gilbert (for Object Refinery Limited);
035 *
036 */
037
038package org.jfree.chart.renderer.category;
039
040import java.awt.Graphics2D;
041import java.awt.Paint;
042import java.awt.Shape;
043import java.awt.geom.Line2D;
044import java.awt.geom.Rectangle2D;
045import java.io.Serializable;
046
047import org.jfree.chart.LegendItem;
048import org.jfree.chart.axis.CategoryAxis;
049import org.jfree.chart.axis.ValueAxis;
050import org.jfree.chart.entity.EntityCollection;
051import org.jfree.chart.event.RendererChangeEvent;
052import org.jfree.chart.plot.CategoryPlot;
053import org.jfree.chart.plot.PlotOrientation;
054import org.jfree.chart.plot.PlotRenderingInfo;
055import org.jfree.chart.renderer.xy.XYStepRenderer;
056import org.jfree.chart.util.PublicCloneable;
057import org.jfree.data.category.CategoryDataset;
058
059/**
060 * A "step" renderer similar to {@link XYStepRenderer} but
061 * that can be used with the {@link CategoryPlot} class.  The example shown
062 * here is generated by the {@code CategoryStepChartDemo1.java} program
063 * included in the JFreeChart Demo Collection:
064 * <br><br>
065 * <img src="doc-files/CategoryStepRendererSample.png"
066 * alt="CategoryStepRendererSample.png">
067 */
068public class CategoryStepRenderer extends AbstractCategoryItemRenderer
069        implements Cloneable, PublicCloneable, Serializable {
070
071    /**
072     * State information for the renderer.
073     */
074    protected static class State extends CategoryItemRendererState {
075
076        /**
077         * A working line for re-use to avoid creating large numbers of
078         * objects.
079         */
080        public Line2D line;
081
082        /**
083         * Creates a new state instance.
084         *
085         * @param info  collects plot rendering information ({@code null}
086         *              permitted).
087         */
088        public State(PlotRenderingInfo info) {
089            super(info);
090            this.line = new Line2D.Double();
091        }
092
093    }
094
095    /** For serialization. */
096    private static final long serialVersionUID = -5121079703118261470L;
097
098    /** The stagger width. */
099    public static final int STAGGER_WIDTH = 5; // could make this configurable
100
101    /**
102     * A flag that controls whether or not the steps for multiple series are
103     * staggered.
104     */
105    private boolean stagger = false;
106
107    /**
108     * Creates a new renderer (stagger defaults to {@code false}).
109     */
110    public CategoryStepRenderer() {
111        this(false);
112    }
113
114    /**
115     * Creates a new renderer.
116     *
117     * @param stagger  should the horizontal part of the step be staggered by
118     *                 series?
119     */
120    public CategoryStepRenderer(boolean stagger) {
121        this.stagger = stagger;
122        setDefaultLegendShape(new Rectangle2D.Double(-4.0, -3.0, 8.0, 6.0));
123    }
124
125    /**
126     * Returns the flag that controls whether the series steps are staggered.
127     *
128     * @return A boolean.
129     */
130    public boolean getStagger() {
131        return this.stagger;
132    }
133
134    /**
135     * Sets the flag that controls whether or not the series steps are
136     * staggered and sends a {@link RendererChangeEvent} to all registered
137     * listeners.
138     *
139     * @param shouldStagger  a boolean.
140     */
141    public void setStagger(boolean shouldStagger) {
142        this.stagger = shouldStagger;
143        fireChangeEvent();
144    }
145
146    /**
147     * Returns a legend item for a series.
148     *
149     * @param datasetIndex  the dataset index (zero-based).
150     * @param series  the series index (zero-based).
151     *
152     * @return The legend item.
153     */
154    @Override
155    public LegendItem getLegendItem(int datasetIndex, int series) {
156
157        CategoryPlot p = getPlot();
158        if (p == null) {
159            return null;
160        }
161
162        // check that a legend item needs to be displayed...
163        if (!isSeriesVisible(series) || !isSeriesVisibleInLegend(series)) {
164            return null;
165        }
166
167        CategoryDataset dataset = p.getDataset(datasetIndex);
168        String label = getLegendItemLabelGenerator().generateLabel(dataset,
169                series);
170        String description = label;
171        String toolTipText = null;
172        if (getLegendItemToolTipGenerator() != null) {
173            toolTipText = getLegendItemToolTipGenerator().generateLabel(
174                    dataset, series);
175        }
176        String urlText = null;
177        if (getLegendItemURLGenerator() != null) {
178            urlText = getLegendItemURLGenerator().generateLabel(dataset,
179                    series);
180        }
181        Shape shape = lookupLegendShape(series);
182        Paint paint = lookupSeriesPaint(series);
183
184        LegendItem item = new LegendItem(label, description, toolTipText,
185                urlText, shape, paint);
186        item.setLabelFont(lookupLegendTextFont(series));
187        Paint labelPaint = lookupLegendTextPaint(series);
188        if (labelPaint != null) {
189            item.setLabelPaint(labelPaint);
190        }
191        item.setSeriesKey(dataset.getRowKey(series));
192        item.setSeriesIndex(series);
193        item.setDataset(dataset);
194        item.setDatasetIndex(datasetIndex);
195        return item;
196    }
197
198    /**
199     * Creates a new state instance.  This method is called from
200     * {@link #initialise(Graphics2D, Rectangle2D, CategoryPlot, int,
201     * PlotRenderingInfo)}, and we override it to ensure that the state
202     * contains a working Line2D instance.
203     *
204     * @param info  the plot rendering info ({@code null} is permitted).
205     *
206     * @return A new state instance.
207     */
208    @Override
209    protected CategoryItemRendererState createState(PlotRenderingInfo info) {
210        return new State(info);
211    }
212
213    /**
214     * Draws a line taking into account the specified orientation.
215     * <p>
216     * In version 1.0.5, the signature of this method was changed by the
217     * addition of the 'state' parameter.  This is an incompatible change, but
218     * is considered a low risk because it is unlikely that anyone has
219     * subclassed this renderer.  If this *does* cause trouble for you, please
220     * report it as a bug.
221     *
222     * @param g2  the graphics device.
223     * @param state  the renderer state.
224     * @param orientation  the plot orientation.
225     * @param x0  the x-coordinate for the start of the line.
226     * @param y0  the y-coordinate for the start of the line.
227     * @param x1  the x-coordinate for the end of the line.
228     * @param y1  the y-coordinate for the end of the line.
229     */
230    protected void drawLine(Graphics2D g2, State state,
231            PlotOrientation orientation, double x0, double y0, double x1,
232            double y1) {
233
234        if (orientation == PlotOrientation.VERTICAL) {
235            state.line.setLine(x0, y0, x1, y1);
236            g2.draw(state.line);
237        }
238        else if (orientation == PlotOrientation.HORIZONTAL) {
239            state.line.setLine(y0, x0, y1, x1); // switch x and y
240            g2.draw(state.line);
241        }
242
243    }
244
245    /**
246     * Draw a single data item.
247     *
248     * @param g2  the graphics device.
249     * @param state  the renderer state.
250     * @param dataArea  the area in which the data is drawn.
251     * @param plot  the plot.
252     * @param domainAxis  the domain axis.
253     * @param rangeAxis  the range axis.
254     * @param dataset  the dataset.
255     * @param row  the row index (zero-based).
256     * @param column  the column index (zero-based).
257     * @param pass  the pass index.
258     */
259    @Override
260    public void drawItem(Graphics2D g2, CategoryItemRendererState state,
261            Rectangle2D dataArea, CategoryPlot plot, CategoryAxis domainAxis,
262            ValueAxis rangeAxis, CategoryDataset dataset, int row,
263            int column, int pass) {
264
265        // do nothing if item is not visible
266        if (!getItemVisible(row, column)) {
267            return;
268        }
269
270        Number value = dataset.getValue(row, column);
271        if (value == null) {
272            return;
273        }
274        PlotOrientation orientation = plot.getOrientation();
275
276        // current data point...
277        double x1s = domainAxis.getCategoryStart(column, getColumnCount(),
278                dataArea, plot.getDomainAxisEdge());
279        double x1 = domainAxis.getCategoryMiddle(column, getColumnCount(),
280                dataArea, plot.getDomainAxisEdge());
281        double x1e = 2 * x1 - x1s; // or: x1s + 2*(x1-x1s)
282        double y1 = rangeAxis.valueToJava2D(value.doubleValue(), dataArea,
283                plot.getRangeAxisEdge());
284        g2.setPaint(getItemPaint(row, column));
285        g2.setStroke(getItemStroke(row, column));
286
287        if (column != 0) {
288            Number previousValue = dataset.getValue(row, column - 1);
289            if (previousValue != null) {
290                // previous data point...
291                double previous = previousValue.doubleValue();
292                double x0s = domainAxis.getCategoryStart(column - 1,
293                        getColumnCount(), dataArea, plot.getDomainAxisEdge());
294                double x0 = domainAxis.getCategoryMiddle(column - 1,
295                        getColumnCount(), dataArea, plot.getDomainAxisEdge());
296                double x0e = 2 * x0 - x0s; // or: x0s + 2*(x0-x0s)
297                double y0 = rangeAxis.valueToJava2D(previous, dataArea,
298                        plot.getRangeAxisEdge());
299                if (getStagger()) {
300                    int xStagger = row * STAGGER_WIDTH;
301                    if (xStagger > (x1s - x0e)) {
302                        xStagger = (int) (x1s - x0e);
303                    }
304                    x1s = x0e + xStagger;
305                }
306                drawLine(g2, (State) state, orientation, x0e, y0, x1s, y0);
307                // extend x0's flat bar
308
309                drawLine(g2, (State) state, orientation, x1s, y0, x1s, y1);
310                // upright bar
311           }
312       }
313       drawLine(g2, (State) state, orientation, x1s, y1, x1e, y1);
314       // x1's flat bar
315
316       // draw the item labels if there are any...
317       if (isItemLabelVisible(row, column)) {
318            drawItemLabel(g2, orientation, dataset, row, column, x1, y1,
319                    (value.doubleValue() < 0.0));
320       }
321
322       // add an item entity, if this information is being collected
323       EntityCollection entities = state.getEntityCollection();
324       if (entities != null) {
325           Rectangle2D hotspot = new Rectangle2D.Double();
326           if (orientation == PlotOrientation.VERTICAL) {
327               hotspot.setRect(x1s, y1, x1e - x1s, 4.0);
328           }
329           else {
330               hotspot.setRect(y1 - 2.0, x1s, 4.0, x1e - x1s);
331           }
332           addItemEntity(entities, dataset, row, column, hotspot);
333       }
334
335    }
336
337    /**
338     * Tests this renderer for equality with an arbitrary object.
339     *
340     * @param obj  the object ({@code null} permitted).
341     *
342     * @return A boolean.
343     */
344    @Override
345    public boolean equals(Object obj) {
346        if (obj == this) {
347            return true;
348        }
349        if (!(obj instanceof CategoryStepRenderer)) {
350            return false;
351        }
352        CategoryStepRenderer that = (CategoryStepRenderer) obj;
353        if (this.stagger != that.stagger) {
354            return false;
355        }
356        return super.equals(obj);
357    }
358
359}