1 /*
2 * Copyright (c) 2011, 2015, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26 package javafx.scene.chart;
27
28
29 import java.util.*;
30
31 import javafx.animation.*;
32 import javafx.application.Platform;
33 import javafx.beans.NamedArg;
34 import javafx.beans.property.DoubleProperty;
35 import javafx.beans.property.SimpleDoubleProperty;
36 import javafx.collections.FXCollections;
37 import javafx.collections.ListChangeListener;
38 import javafx.collections.ObservableList;
39 import javafx.scene.AccessibleRole;
40 import javafx.scene.Group;
41 import javafx.scene.Node;
42 import javafx.scene.layout.StackPane;
43 import javafx.scene.shape.*;
44 import javafx.util.Duration;
45
46 import com.sun.javafx.charts.Legend;
47 import com.sun.javafx.charts.Legend.LegendItem;
48 import com.sun.javafx.css.converters.BooleanConverter;
49
50 import javafx.beans.property.BooleanProperty;
51 import javafx.beans.value.WritableValue;
52 import javafx.css.CssMetaData;
53 import javafx.css.Styleable;
54 import javafx.css.StyleableBooleanProperty;
55 import javafx.css.StyleableProperty;
56
57 /**
58 * StackedAreaChart is a variation of {@link AreaChart} that displays trends of the
59 * contribution of each value. (over time e.g.) The areas are stacked so that each
60 * series adjoins but does not overlap the preceding series. This contrasts with
61 * the Area chart where each series overlays the preceding series.
62 *
63 * The cumulative nature of the StackedAreaChart gives an idea of the total Y data
64 * value at any given point along the X axis.
65 *
66 * Since data points across multiple series may not be common, StackedAreaChart
67 * interpolates values along the line joining the data points whenever necessary.
68 *
69 * @since JavaFX 2.1
70 */
71 public class StackedAreaChart<X,Y> extends XYChart<X,Y> {
72
73 // -------------- PRIVATE FIELDS ------------------------------------------
74
75 /** A multiplier for teh Y values that we store for each series, it is used to animate in a new series */
76 private Map<Series<X,Y>, DoubleProperty> seriesYMultiplierMap = new HashMap<>();
77 private Legend legend = new Legend();
78
79 // -------------- PUBLIC PROPERTIES ----------------------------------------
80 /**
81 * When true, CSS styleable symbols are created for any data items that
82 * don't have a symbol node specified.
83 * @since JavaFX 8.0
84 */
85 private BooleanProperty createSymbols = new StyleableBooleanProperty(true) {
86 @Override
87 protected void invalidated() {
88 for (int seriesIndex = 0; seriesIndex < getData().size(); seriesIndex++) {
89 Series<X, Y> series = getData().get(seriesIndex);
90 for (int itemIndex = 0; itemIndex < series.getData().size(); itemIndex++) {
91 Data<X, Y> item = series.getData().get(itemIndex);
92 Node symbol = item.getNode();
93 if (get() && symbol == null) { // create any symbols
94 symbol = createSymbol(series, getData().indexOf(series), item, itemIndex);
95 if (null != symbol) {
96 getPlotChildren().add(symbol);
97 }
98 } else if (!get() && symbol != null) { // remove symbols
99 getPlotChildren().remove(symbol);
100 symbol = null;
101 item.setNode(null);
102 }
103 }
104 }
105 requestChartLayout();
106 }
107
108 public Object getBean() {
109 return this;
110 }
111
112 public String getName() {
113 return "createSymbols";
114 }
115
116 public CssMetaData<StackedAreaChart<?, ?>,Boolean> getCssMetaData() {
117 return StyleableProperties.CREATE_SYMBOLS;
118 }
119 };
120
121 /**
122 * Indicates whether symbols for data points will be created or not.
123 *
124 * @return true if symbols for data points will be created and false otherwise.
125 * @since JavaFX 8.0
126 */
127 public final boolean getCreateSymbols() { return createSymbols.getValue(); }
128 public final void setCreateSymbols(boolean value) { createSymbols.setValue(value); }
129 public final BooleanProperty createSymbolsProperty() { return createSymbols; }
130
131 // -------------- CONSTRUCTORS ----------------------------------------------
132
133 /**
134 * Construct a new Area Chart with the given axis
135 *
136 * @param xAxis The x axis to use
137 * @param yAxis The y axis to use
138 */
139 public StackedAreaChart(@NamedArg("xAxis") Axis<X> xAxis, @NamedArg("yAxis") Axis<Y> yAxis) {
140 this(xAxis,yAxis, FXCollections.<Series<X,Y>>observableArrayList());
141 }
142
143 /**
144 * Construct a new Area Chart with the given axis and data.
145 * <p>
146 * Note: yAxis must be a ValueAxis, otherwise {@code IllegalArgumentException} is thrown.
147 *
148 * @param xAxis The x axis to use
149 * @param yAxis The y axis to use
150 * @param data The data to use, this is the actual list used so any changes to it will be reflected in the chart
151 *
152 * @throws java.lang.IllegalArgumentException if yAxis is not a ValueAxis
153 */
154 public StackedAreaChart(@NamedArg("xAxis") Axis<X> xAxis, @NamedArg("yAxis") Axis<Y> yAxis, @NamedArg("data") ObservableList<Series<X,Y>> data) {
155 super(xAxis,yAxis);
156 if (!(yAxis instanceof ValueAxis)) {
157 throw new IllegalArgumentException("Axis type incorrect, yAxis must be of ValueAxis type.");
158 }
159 setLegend(legend);
160 setData(data);
161 }
162
163 // -------------- METHODS ------------------------------------------------------------------------------------------
164
165 private static double doubleValue(Number number) { return doubleValue(number, 0); }
166 private static double doubleValue(Number number, double nullDefault) {
167 return (number == null) ? nullDefault : number.doubleValue();
168 }
169
170 @Override protected void dataItemAdded(Series<X,Y> series, int itemIndex, Data<X,Y> item) {
171 final Node symbol = createSymbol(series, getData().indexOf(series), item, itemIndex);
172 if (shouldAnimate()) {
173 boolean animate = false;
174 if (itemIndex > 0 && itemIndex < (series.getData().size()-1)) {
175 animate = true;
176 Data<X,Y> p1 = series.getData().get(itemIndex - 1);
177 Data<X,Y> p2 = series.getData().get(itemIndex + 1);
178 double x1 = getXAxis().toNumericValue(p1.getXValue());
179 double y1 = getYAxis().toNumericValue(p1.getYValue());
180 double x3 = getXAxis().toNumericValue(p2.getXValue());
181 double y3 = getYAxis().toNumericValue(p2.getYValue());
182
183 double x2 = getXAxis().toNumericValue(item.getXValue());
184 double y2 = getYAxis().toNumericValue(item.getYValue());
185
186 // //1. y intercept of the line : y = ((y3-y1)/(x3-x1)) * x2 + (x3y1 - y3x1)/(x3 -x1)
187 double y = ((y3-y1)/(x3-x1)) * x2 + (x3*y1 - y3*x1)/(x3-x1);
188 item.setCurrentY(getYAxis().toRealValue(y));
189 item.setCurrentX(getXAxis().toRealValue(x2));
190 //2. we can simply use the midpoint on the line as well..
191 // double x = (x3 + x1)/2;
192 // double y = (y3 + y1)/2;
193 // item.setCurrentX(x);
194 // item.setCurrentY(y);
195 } else if (itemIndex == 0 && series.getData().size() > 1) {
196 animate = true;
197 item.setCurrentX(series.getData().get(1).getXValue());
198 item.setCurrentY(series.getData().get(1).getYValue());
199 } else if (itemIndex == (series.getData().size() - 1) && series.getData().size() > 1) {
200 animate = true;
201 int last = series.getData().size() - 2;
202 item.setCurrentX(series.getData().get(last).getXValue());
203 item.setCurrentY(series.getData().get(last).getYValue());
204 } else if (symbol != null) {
205 // fade in new symbol
206 symbol.setOpacity(0);
207 getPlotChildren().add(symbol);
208 FadeTransition ft = new FadeTransition(Duration.millis(500),symbol);
209 ft.setToValue(1);
210 ft.play();
211 }
212 if (animate) {
213 animate(
214 new KeyFrame(Duration.ZERO,
215 (e) -> {
216 if (symbol != null && !getPlotChildren().contains(symbol)) {
217 getPlotChildren().add(symbol);
218 } },
219 new KeyValue(item.currentYProperty(),
220 item.getCurrentY()),
221 new KeyValue(item.currentXProperty(),
222 item.getCurrentX())
223 ),
224 new KeyFrame(Duration.millis(800), new KeyValue(item.currentYProperty(),
225 item.getYValue(), Interpolator.EASE_BOTH),
226 new KeyValue(item.currentXProperty(),
227 item.getXValue(), Interpolator.EASE_BOTH))
228 );
229 }
230
231 } else if (symbol != null) {
232 getPlotChildren().add(symbol);
233 }
234 }
235
236 @Override protected void dataItemRemoved(final Data<X,Y> item, final Series<X,Y> series) {
237 final Node symbol = item.getNode();
238
239 if (symbol != null) {
240 symbol.focusTraversableProperty().unbind();
241 }
242
243 // remove item from sorted list
244 int itemIndex = series.getItemIndex(item);
245 if (shouldAnimate()) {
246 boolean animate = false;
247 if (itemIndex > 0 && itemIndex < series.getDataSize()) {
248 animate = true;
249 int index=0;
250
251 Data<X,Y> p1 = series.getItem(itemIndex - 1);
252 Data<X,Y> p2 = series.getItem(itemIndex + 1);
253
254 if (p2 == null) {
255 return;
256 }
257
258 double x1 = getXAxis().toNumericValue(p1.getXValue());
259 double y1 = getYAxis().toNumericValue(p1.getYValue());
260 double x3 = getXAxis().toNumericValue(p2.getXValue());
261 double y3 = getYAxis().toNumericValue(p2.getYValue());
262
263 double x2 = getXAxis().toNumericValue(item.getXValue());
264 double y2 = getYAxis().toNumericValue(item.getYValue());
265
266 // //1. y intercept of the line : y = ((y3-y1)/(x3-x1)) * x2 + (x3y1 - y3x1)/(x3 -x1)
267 double y = ((y3-y1)/(x3-x1)) * x2 + (x3*y1 - y3*x1)/(x3-x1);
268 item.setCurrentX(getXAxis().toRealValue(x2));
269 item.setCurrentY(getYAxis().toRealValue(y2));
270 item.setXValue(getXAxis().toRealValue(x2));
271 item.setYValue(getYAxis().toRealValue(y));
272 //2. we can simply use the midpoint on the line as well..
273 // double x = (x3 + x1)/2;
274 // double y = (y3 + y1)/2;
275 // item.setCurrentX(x);
276 // item.setCurrentY(y);
277 } else if (itemIndex == 0 && series.getDataSize() > 1) {
278 animate = true;
279 item.setXValue(series.getData().get(0).getXValue());
280 item.setYValue(series.getData().get(0).getYValue());
281 } else if (itemIndex == (series.getDataSize() - 1) && series.getDataSize() > 1) {
282 animate = true;
283 int last = series.getData().size() - 1;
284 item.setXValue(series.getData().get(last).getXValue());
285 item.setYValue(series.getData().get(last).getYValue());
286 } else {
287 // fade out symbol
288 symbol.setOpacity(0);
289 FadeTransition ft = new FadeTransition(Duration.millis(500),symbol);
290 ft.setToValue(0);
291 ft.setOnFinished(actionEvent -> {
292 getPlotChildren().remove(symbol);
293 removeDataItemFromDisplay(series, item);
294 symbol.setOpacity(1.0);
295 });
296 ft.play();
297 }
298 if (animate) {
299 animate( new KeyFrame(Duration.ZERO, new KeyValue(item.currentYProperty(),
300 item.getCurrentY()), new KeyValue(item.currentXProperty(),
301 item.getCurrentX())),
302 new KeyFrame(Duration.millis(800), actionEvent -> {
303 getPlotChildren().remove(symbol);
304 removeDataItemFromDisplay(series, item);
305 },
306 new KeyValue(item.currentYProperty(),
307 item.getYValue(), Interpolator.EASE_BOTH),
308 new KeyValue(item.currentXProperty(),
309 item.getXValue(), Interpolator.EASE_BOTH))
310 );
311 }
312 } else {
313 getPlotChildren().remove(symbol);
314 removeDataItemFromDisplay(series, item);
315 }
316 //Note: better animation here, point should move from old position to new position at center point between prev and next symbols
317 }
318
319 /** @inheritDoc */
320 @Override protected void dataItemChanged(Data<X, Y> item) {
321 }
322
323 @Override protected void seriesChanged(ListChangeListener.Change<? extends Series> c) {
324 // Update style classes for all series lines and symbols
325 for (int i = 0; i < getDataSize(); i++) {
326 final Series<X,Y> s = getData().get(i);
327 Path seriesLine = (Path)((Group)s.getNode()).getChildren().get(1);
328 Path fillPath = (Path)((Group)s.getNode()).getChildren().get(0);
329 seriesLine.getStyleClass().setAll("chart-series-area-line", "series" + i, s.defaultColorStyleClass);
330 fillPath.getStyleClass().setAll("chart-series-area-fill", "series" + i, s.defaultColorStyleClass);
331 for (int j=0; j < s.getData().size(); j++) {
332 final Data<X,Y> item = s.getData().get(j);
333 final Node node = item.getNode();
334 if(node!=null) node.getStyleClass().setAll("chart-area-symbol", "series" + i, "data" + j, s.defaultColorStyleClass);
335 }
336 }
337 }
338
339 @Override protected void seriesAdded(Series<X,Y> series, int seriesIndex) {
340 // create new paths for series
341 Path seriesLine = new Path();
342 Path fillPath = new Path();
343 seriesLine.setStrokeLineJoin(StrokeLineJoin.BEVEL);
344 fillPath.setStrokeLineJoin(StrokeLineJoin.BEVEL);
345 Group areaGroup = new Group(fillPath,seriesLine);
346 series.setNode(areaGroup);
347 // create series Y multiplier
348 DoubleProperty seriesYAnimMultiplier = new SimpleDoubleProperty(this, "seriesYMultiplier");
349 seriesYMultiplierMap.put(series, seriesYAnimMultiplier);
350 // handle any data already in series
351 if (shouldAnimate()) {
352 seriesYAnimMultiplier.setValue(0d);
353 } else {
354 seriesYAnimMultiplier.setValue(1d);
355 }
356 getPlotChildren().add(areaGroup);
357 List<KeyFrame> keyFrames = new ArrayList<KeyFrame>();
358 if (shouldAnimate()) {
359 // animate in new series
360 keyFrames.add(new KeyFrame(Duration.ZERO,
361 new KeyValue(areaGroup.opacityProperty(), 0),
362 new KeyValue(seriesYAnimMultiplier, 0)
363 ));
364 keyFrames.add(new KeyFrame(Duration.millis(200),
365 new KeyValue(areaGroup.opacityProperty(), 1)
366 ));
367 keyFrames.add(new KeyFrame(Duration.millis(500),
368 new KeyValue(seriesYAnimMultiplier, 1)
369 ));
370 }
371 for (int j=0; j<series.getData().size(); j++) {
372 Data<X,Y> item = series.getData().get(j);
373 final Node symbol = createSymbol(series, seriesIndex, item, j);
374 if (symbol != null) {
375 if (shouldAnimate()) symbol.setOpacity(0);
376 getPlotChildren().add(symbol);
377 if (shouldAnimate()) {
378 // fade in new symbol
379 keyFrames.add(new KeyFrame(Duration.ZERO, new KeyValue(symbol.opacityProperty(), 0)));
380 keyFrames.add(new KeyFrame(Duration.millis(200), new KeyValue(symbol.opacityProperty(), 1)));
381 }
382 }
383 }
384 if (shouldAnimate()) animate(keyFrames.toArray(new KeyFrame[keyFrames.size()]));
385 }
386
387 @Override protected void seriesRemoved(final Series<X,Y> series) {
388 // remove series Y multiplier
389 seriesYMultiplierMap.remove(series);
390 // remove all symbol nodes
391 if (shouldAnimate()) {
392 // create list of all nodes we need to fade out
393 final List<Node> nodes = new ArrayList<Node>();
394 nodes.add(series.getNode());
395 for (Data<X,Y> d: series.getData()) nodes.add(d.getNode());
396 // fade out old and symbols
397 if (getCreateSymbols()) {
398 KeyValue[] startValues = new KeyValue[nodes.size()];
399 KeyValue[] endValues = new KeyValue[nodes.size()];
400 for (int j=0; j < nodes.size(); j++) {
401 startValues[j] = new KeyValue(nodes.get(j).opacityProperty(),1);
402 endValues[j] = new KeyValue(nodes.get(j).opacityProperty(),0);
403 }
404 Timeline tl = new Timeline();
405 tl.getKeyFrames().addAll(
406 new KeyFrame(Duration.ZERO,startValues),
407 new KeyFrame(Duration.millis(400), actionEvent -> {
408 getPlotChildren().removeAll(nodes);
409 removeSeriesFromDisplay(series);
410 },endValues)
411 );
412 tl.play();
413 } else {
414 Timeline tl = new Timeline();
415 tl.getKeyFrames().addAll(
416 new KeyFrame(Duration.millis(400), actionEvent -> {
417 getPlotChildren().removeAll(nodes);
418 removeSeriesFromDisplay(series);
419 })
420 );
421 tl.play();
422 }
423 } else {
424 getPlotChildren().remove(series.getNode());
425 for (Data<X,Y> d:series.getData()) getPlotChildren().remove(d.getNode());
426 removeSeriesFromDisplay(series);
427 }
428 }
429
430 /** @inheritDoc */
431 @Override protected void updateAxisRange() {
432 // This override is necessary to update axis range based on cumulative Y value for the
433 // Y axis instead of the normal way where max value in the data range is used.
434 final Axis<X> xa = getXAxis();
435 final Axis<Y> ya = getYAxis();
436 if (xa.isAutoRanging()) {
437 List xData = new ArrayList<Number>();
438 for(Series<X,Y> series : getData()) {
439 for(Data<X,Y> data: series.getData()) {
440 xData.add(data.getXValue());
441 }
442 }
443 xa.invalidateRange(xData);
444 }
445 if (ya.isAutoRanging()) {
446 double totalMinY = Double.MAX_VALUE;
447 Iterator<Series<X, Y>> seriesIterator = getDisplayedSeriesIterator();
448 boolean first = true;
449 NavigableMap<Double, Double> accum = new TreeMap<>();
450 NavigableMap<Double, Double> prevAccum = new TreeMap<>();
451 NavigableMap<Double, Double> currentValues = new TreeMap<>();
452 while (seriesIterator.hasNext()) {
453 currentValues.clear();
454 Series<X, Y> series = seriesIterator.next();
455 for(Data<X,Y> item : series.getData()) {
456 if(item != null) {
457 final double xv = xa.toNumericValue(item.getXValue());
458 final double yv = ya.toNumericValue(item.getYValue());
459 currentValues.put(xv, yv);
460 if (first) {
461 // On the first pass, just fill the map
462 accum.put(xv, yv);
463 // minimum is applicable only in the first series
464 totalMinY = Math.min(totalMinY, yv);
465 } else {
466 if (prevAccum.containsKey(xv)) {
467 accum.put(xv, prevAccum.get(xv) + yv);
468 } else {
469 // If the point wasn't yet in the previous (accumulated) series
470 Map.Entry<Double, Double> he = prevAccum.higherEntry(xv);
471 Map.Entry<Double, Double> le = prevAccum.lowerEntry(xv);
472 if (he != null && le != null) {
473 // If there's both point above and below this point, interpolate
474 accum.put(xv, ((xv - le.getKey()) / (he.getKey() - le.getKey())) *
475 (le.getValue() + he.getValue()) + yv);
476 } else if (he != null) {
477 // The point is before the first point in the previously accumulated series
478 accum.put(xv, he.getValue() + yv);
479 } else if (le != null) {
480 // The point is after the last point in the previously accumulated series
481 accum.put(xv, le.getValue() + yv);
482 } else {
483 // The previously accumulated series is empty
484 accum.put(xv, yv);
485 }
486 }
487 }
488 }
489 }
490 // Now update all the keys that were in the previous series, but not in the new one
491 for (Map.Entry<Double, Double> e : prevAccum.entrySet()) {
492 if (accum.keySet().contains(e.getKey())) {
493 continue;
494 }
495 Double k = e.getKey();
496 final Double v = e.getValue();
497 // Look at the values of the current series
498 Map.Entry<Double, Double> he = currentValues.higherEntry(k);
499 Map.Entry<Double, Double> le = currentValues.lowerEntry(k);
500 if (he != null && le != null) {
501 // Interpolate the for the point from current series and add the accumulated value
502 accum.put(k, ((k - le.getKey()) / (he.getKey() - le.getKey())) *
503 (le.getValue() + he.getValue()) + v);
504 } else if (he != null) {
505 // There accumulated value is before the first value in the current series
506 accum.put(k, he.getValue() + v);
507 } else if (le != null) {
508 // There accumulated value is after the last value in the current series
509 accum.put(k, le.getValue() + v);
510 } else {
511 // The current series are empty
512 accum.put(k, v);
513 }
514
515 }
516
517 prevAccum.clear();
518 prevAccum.putAll(accum);
519 accum.clear();
520 first = (totalMinY == Double.MAX_VALUE); // If there was already some value in the series, we can consider as
521 // being past the first series
522
523 }
524 if(totalMinY != Double.MAX_VALUE) ya.invalidateRange(Arrays.asList(ya.toRealValue(totalMinY),
525 ya.toRealValue(Collections.max(prevAccum.values()))));
526
527 }
528 }
529
530
531 /** @inheritDoc */
532 @Override protected void layoutPlotChildren() {
533 ArrayList<DataPointInfo<X, Y>> currentSeriesData = new ArrayList<>();
534 // AggregateData hold the data points of both the current and the previous series.
535 // The goal is to collect all the data, sort it and iterate.
536 ArrayList<DataPointInfo<X, Y>> aggregateData = new ArrayList<>();
537 for (int seriesIndex=0; seriesIndex < getDataSize(); seriesIndex++) { // for every series
538 Series<X, Y> series = getData().get(seriesIndex);
539 aggregateData.clear();
540 // copy currentSeriesData accumulated in the previous iteration to aggregate.
541 for(DataPointInfo<X, Y> data : currentSeriesData) {
542 data.partOf = PartOf.PREVIOUS;
543 aggregateData.add(data);
544 }
545 currentSeriesData.clear();
546 // now copy actual data of the current series.
547 for (Iterator<Data<X, Y>> it = getDisplayedDataIterator(series); it.hasNext(); ) {
548 Data<X, Y> item = it.next();
549 DataPointInfo<X, Y> itemInfo = new DataPointInfo<>(item, item.getXValue(),
550 item.getYValue(), PartOf.CURRENT);
551 aggregateData.add(itemInfo);
552 }
553 DoubleProperty seriesYAnimMultiplier = seriesYMultiplierMap.get(series);
554 Path seriesLine = (Path)((Group)series.getNode()).getChildren().get(1);
555 Path fillPath = (Path)((Group)series.getNode()).getChildren().get(0);
556 seriesLine.getElements().clear();
557 fillPath.getElements().clear();
558 int dataIndex = 0;
559 // Sort data points from prev and current series
560 sortAggregateList(aggregateData);
561
562 Axis<Y> yAxis = getYAxis();
563 Axis<X> xAxis = getXAxis();
564 boolean firstCurrent = false;
565 boolean lastCurrent = false;
566 int firstCurrentIndex = findNextCurrent(aggregateData, -1);
567 int lastCurrentIndex = findPreviousCurrent(aggregateData, aggregateData.size());
568 double basePosition = yAxis.getZeroPosition();
569 if (Double.isNaN(basePosition)) {
570 ValueAxis<Number> valueYAxis = (ValueAxis<Number>) yAxis;
571 if (valueYAxis.getLowerBound() > 0) {
572 basePosition = valueYAxis.getDisplayPosition(valueYAxis.getLowerBound());
573 } else {
574 basePosition = valueYAxis.getDisplayPosition(valueYAxis.getUpperBound());
575 }
576 }
577 // Iterate over the aggregate data : this process accumulates data points
578 // cumulatively from the bottom to top of stack
579
580 for (DataPointInfo<X, Y> dataInfo : aggregateData) {
581 if (dataIndex == lastCurrentIndex) lastCurrent = true;
582 if (dataIndex == firstCurrentIndex) firstCurrent = true;
583 final Data<X,Y> item = dataInfo.dataItem;
584 if (dataInfo.partOf.equals(PartOf.CURRENT)) { // handle data from current series
585 int pIndex = findPreviousPrevious(aggregateData, dataIndex);
586 int nIndex = findNextPrevious(aggregateData, dataIndex);
587 DataPointInfo<X, Y> prevPoint;
588 DataPointInfo<X, Y> nextPoint;
589 if (pIndex == -1 || (nIndex == -1 && !(aggregateData.get(pIndex).x.equals(dataInfo.x)))) {
590 if (firstCurrent) {
591 // Need to add the drop down point.
592 Data<X, Y> ddItem = new Data(dataInfo.x, 0);
593 addDropDown(currentSeriesData, ddItem, ddItem.getXValue(), ddItem.getYValue(),
594 xAxis.getDisplayPosition(ddItem.getCurrentX()), basePosition);
595 }
596 double x = xAxis.getDisplayPosition(item.getCurrentX());
597 double y = yAxis.getDisplayPosition(
598 yAxis.toRealValue(yAxis.toNumericValue(item.getCurrentY()) * seriesYAnimMultiplier.getValue()));
599 addPoint(currentSeriesData, item, item.getXValue(), item.getYValue(), x, y,
600 PartOf.CURRENT, false, (firstCurrent) ? false : true);
601 if (dataIndex == lastCurrentIndex) {
602 // need to add drop down point
603 Data<X, Y> ddItem = new Data(dataInfo.x, 0);
604 addDropDown(currentSeriesData, ddItem, ddItem.getXValue(), ddItem.getYValue(),
605 xAxis.getDisplayPosition(ddItem.getCurrentX()), basePosition);
606 }
607 } else {
608 prevPoint = aggregateData.get(pIndex);
609 if (prevPoint.x.equals(dataInfo.x)) { // Need to add Y values
610 // Check if prevPoint is a dropdown - as the stable sort preserves the order.
611 // If so, find the non dropdown previous point on previous series.
612 if (prevPoint.dropDown) {
613 pIndex = findPreviousPrevious(aggregateData, pIndex);
614 prevPoint = aggregateData.get(pIndex);
615 // If lastCurrent - add this drop down
616 }
617 if (prevPoint.x.equals(dataInfo.x)) { // simply add
618 double x = xAxis.getDisplayPosition(item.getCurrentX());
619 final double yv = yAxis.toNumericValue(item.getCurrentY()) + yAxis.toNumericValue(prevPoint.y);
620 double y = yAxis.getDisplayPosition(
621 yAxis.toRealValue(yv * seriesYAnimMultiplier.getValue()));
622 addPoint(currentSeriesData, item, dataInfo.x, yAxis.toRealValue(yv), x, y, PartOf.CURRENT, false,
623 (firstCurrent) ? false : true);
624 }
625 if (lastCurrent) {
626 addDropDown(currentSeriesData, item, prevPoint.x, prevPoint.y, prevPoint.displayX, prevPoint.displayY);
627 }
628 } else {
629 // interpolate
630 nextPoint = (nIndex == -1) ? null : aggregateData.get(nIndex);
631 prevPoint = (pIndex == -1) ? null : aggregateData.get(pIndex);
632 final double yValue = yAxis.toNumericValue(item.getCurrentY());
633 if (prevPoint != null && nextPoint != null) {
634 double x = xAxis.getDisplayPosition(item.getCurrentX());
635 double displayY = interpolate(prevPoint.displayX,
636 prevPoint.displayY, nextPoint.displayX, nextPoint.displayY, x);
637 double dataY = interpolate(xAxis.toNumericValue(prevPoint.x),
638 yAxis.toNumericValue(prevPoint.y),
639 xAxis.toNumericValue(nextPoint.x),
640 yAxis.toNumericValue(nextPoint.y),
641 xAxis.toNumericValue(dataInfo.x));
642 if (firstCurrent) {
643 // now create the drop down point
644 Data<X, Y> ddItem = new Data(dataInfo.x, dataY);
645 addDropDown(currentSeriesData, ddItem, dataInfo.x, yAxis.toRealValue(dataY), x, displayY);
646 }
647 double y = yAxis.getDisplayPosition(yAxis.toRealValue((yValue + dataY) * seriesYAnimMultiplier.getValue()));
648 // Add the current point
649 addPoint(currentSeriesData, item, dataInfo.x, yAxis.toRealValue(yValue + dataY), x, y, PartOf.CURRENT, false,
650 (firstCurrent) ? false : true);
651 if (dataIndex == lastCurrentIndex) {
652 // add drop down point
653 Data<X, Y> ddItem = new Data(dataInfo.x, dataY);
654 addDropDown(currentSeriesData, ddItem, dataInfo.x, yAxis.toRealValue(dataY), x, displayY);
655 }
656 // Note: add drop down if last current
657 }
658 else {
659 // we do not need to take care of this as it is
660 // already handled above with check of if(pIndex == -1 or nIndex == -1)
661 }
662 }
663 }
664
665 } else { // handle data from Previous series.
666 int pIndex = findPreviousCurrent(aggregateData, dataIndex);
667 int nIndex = findNextCurrent(aggregateData, dataIndex);
668 DataPointInfo<X, Y> prevPoint;
669 DataPointInfo<X, Y> nextPoint;
670 if (dataInfo.dropDown) {
671 if (xAxis.toNumericValue(dataInfo.x) <=
672 xAxis.toNumericValue(aggregateData.get(firstCurrentIndex).x) ||
673 xAxis.toNumericValue(dataInfo.x) > xAxis.toNumericValue(aggregateData.get(lastCurrentIndex).x)) {
674 addDropDown(currentSeriesData, item, dataInfo.x, dataInfo.y, dataInfo.displayX, dataInfo.displayY);
675 }
676 } else {
677 if (pIndex == -1 || nIndex == -1) {
678 addPoint(currentSeriesData, item, dataInfo.x, dataInfo.y, dataInfo.displayX, dataInfo.displayY,
679 PartOf.CURRENT, true, false);
680 } else {
681 nextPoint = aggregateData.get(nIndex);
682 if (nextPoint.x.equals(dataInfo.x)) {
683 // do nothing as the current point is already there.
684 } else {
685 // interpolate on the current series.
686 prevPoint = aggregateData.get(pIndex);
687 double x = xAxis.getDisplayPosition(item.getCurrentX());
688 double dataY = interpolate(xAxis.toNumericValue(prevPoint.x),
689 yAxis.toNumericValue(prevPoint.y),
690 xAxis.toNumericValue(nextPoint.x),
691 yAxis.toNumericValue(nextPoint.y),
692 xAxis.toNumericValue(dataInfo.x));
693 final double yv = yAxis.toNumericValue(dataInfo.y) + dataY;
694 double y = yAxis.getDisplayPosition(
695 yAxis.toRealValue(yv * seriesYAnimMultiplier.getValue()));
696 addPoint(currentSeriesData, new Data(dataInfo.x, dataY), dataInfo.x, yAxis.toRealValue(yv), x, y, PartOf.CURRENT, true, true);
697 }
698 }
699 }
700 }
701 dataIndex++;
702 if (firstCurrent) firstCurrent = false;
703 if (lastCurrent) lastCurrent = false;
704 } // end of inner for loop
705
706 // Draw the SeriesLine and Series fill
707 if (!currentSeriesData.isEmpty()) {
708 seriesLine.getElements().add(new MoveTo(currentSeriesData.get(0).displayX, currentSeriesData.get(0).displayY));
709 fillPath.getElements().add(new MoveTo(currentSeriesData.get(0).displayX, currentSeriesData.get(0).displayY));
710 }
711 for (DataPointInfo<X, Y> point : currentSeriesData) {
712 if (point.lineTo) {
713 seriesLine.getElements().add(new LineTo(point.displayX, point.displayY));
714 } else {
715 seriesLine.getElements().add(new MoveTo(point.displayX, point.displayY));
716 }
717 fillPath.getElements().add(new LineTo(point.displayX, point.displayY));
718 // draw symbols only for actual data points and skip for interpolated points.
719 if (!point.skipSymbol) {
720 Node symbol = point.dataItem.getNode();
721 if (symbol != null) {
722 final double w = symbol.prefWidth(-1);
723 final double h = symbol.prefHeight(-1);
724 symbol.resizeRelocate(point.displayX-(w/2), point.displayY-(h/2),w,h);
725 }
726 }
727 }
728 for(int i = aggregateData.size()-1; i > 0; i--) {
729 DataPointInfo<X, Y> point = aggregateData.get(i);
730 if (PartOf.PREVIOUS.equals(point.partOf)) {
731 fillPath.getElements().add(new LineTo(point.displayX, point.displayY));
732 }
733 }
734 if (!fillPath.getElements().isEmpty()) {
735 fillPath.getElements().add(new ClosePath());
736 }
737
738 } // end of out for loop
739 }
740
741 private void addDropDown(ArrayList<DataPointInfo<X, Y>> currentSeriesData, Data<X, Y> item, X xValue, Y yValue, double x, double y) {
742 DataPointInfo<X, Y> dropDownDataPoint = new DataPointInfo<>(true);
743 dropDownDataPoint.setValues(item, xValue, yValue, x, y, PartOf.CURRENT, true, false);
744 currentSeriesData.add(dropDownDataPoint);
745 }
746
747 private void addPoint(ArrayList<DataPointInfo<X, Y>> currentSeriesData, Data<X, Y> item, X xValue, Y yValue, double x, double y, PartOf partof,
748 boolean symbol, boolean lineTo) {
749 DataPointInfo<X, Y> currentDataPoint = new DataPointInfo<>();
750 currentDataPoint.setValues(item, xValue, yValue, x, y, partof, symbol, lineTo);
751 currentSeriesData.add(currentDataPoint);
752 }
753
754 //-------------------- helper methods to retrieve data points from the previous
755 // or current data series.
756 private int findNextCurrent(ArrayList<DataPointInfo<X, Y>> points, int index) {
757 for(int i = index+1; i < points.size(); i++) {
758 if (points.get(i).partOf.equals(PartOf.CURRENT)) {
759 return i;
760 }
761 }
762 return -1;
763 }
764
765 private int findPreviousCurrent(ArrayList<DataPointInfo<X, Y>> points, int index) {
766 for(int i = index-1; i >= 0; i--) {
767 if (points.get(i).partOf.equals(PartOf.CURRENT)) {
768 return i;
769 }
770 }
771 return -1;
772 }
773
774
775 private int findPreviousPrevious(ArrayList<DataPointInfo<X, Y>> points, int index) {
776 for(int i = index-1; i >= 0; i--) {
777 if (points.get(i).partOf.equals(PartOf.PREVIOUS)) {
778 return i;
779 }
780 }
781 return -1;
782 }
783 private int findNextPrevious(ArrayList<DataPointInfo<X, Y>> points, int index) {
784 for(int i = index+1; i < points.size(); i++) {
785 if (points.get(i).partOf.equals(PartOf.PREVIOUS)) {
786 return i;
787 }
788 }
789 return -1;
790 }
791
792
793 private void sortAggregateList(ArrayList<DataPointInfo<X, Y>> aggregateList) {
794 Collections.sort(aggregateList, (o1, o2) -> {
795 Data<X,Y> d1 = o1.dataItem;
796 Data<X,Y> d2 = o2.dataItem;
797 double val1 = getXAxis().toNumericValue(d1.getXValue());
798 double val2 = getXAxis().toNumericValue(d2.getXValue());
799 return (val1 < val2 ? -1 : ( val1 == val2) ? 0 : 1);
800 });
801 }
802
803 private double interpolate(double lowX, double lowY, double highX, double highY, double x) {
804 // using y = mx+c find the y for the given x.
805 return (((highY - lowY)/(highX - lowX))*(x - lowX))+lowY;
806 }
807
808 private Node createSymbol(Series<X,Y> series, int seriesIndex, final Data<X,Y> item, int itemIndex) {
809 Node symbol = item.getNode();
810 // check if symbol has already been created
811 if (symbol == null && getCreateSymbols()) {
812 symbol = new StackPane();
813 symbol.setAccessibleRole(AccessibleRole.TEXT);
814 symbol.setAccessibleRoleDescription("Point");
815 symbol.focusTraversableProperty().bind(Platform.accessibilityActiveProperty());
816 item.setNode(symbol);
817 }
818 // set symbol styles
819 // Note not sure if we want to add or check, ie be more careful and efficient here
820 if (symbol != null) symbol.getStyleClass().setAll("chart-area-symbol", "series" + seriesIndex, "data" + itemIndex,
821 series.defaultColorStyleClass);
822 return symbol;
823 }
824
825 /**
826 * This is called whenever a series is added or removed and the legend needs to be updated
827 */
828 @Override protected void updateLegend() {
829 legend.getItems().clear();
830 if (getData() != null) {
831 for (int seriesIndex=0; seriesIndex < getData().size(); seriesIndex++) {
832 Series<X,Y> series = getData().get(seriesIndex);
833 LegendItem legenditem = new LegendItem(series.getName());
834 legenditem.getSymbol().getStyleClass().addAll("chart-area-symbol","series"+seriesIndex,
835 "area-legend-symbol", series.defaultColorStyleClass);
836 legend.getItems().add(legenditem);
837 }
838 }
839 if (legend.getItems().size() > 0) {
840 if (getLegend() == null) {
841 setLegend(legend);
842 }
843 } else {
844 setLegend(null);
845 }
846 }
847
848 // -------------- INNER CLASSES --------------------------------------------
849 /*
850 * Helper class to hold data and display and other information for each
851 * data point
852 */
853 final static class DataPointInfo<X, Y> {
854 X x;
855 Y y;
856 double displayX;
857 double displayY;
858 Data<X,Y> dataItem;
859 PartOf partOf;
860 boolean skipSymbol = false; // interpolated point - skip drawing symbol
861 boolean lineTo = false; // should there be a lineTo to this point on SeriesLine.
862 boolean dropDown = false; // Is this a drop down point ( non data point).
863
864 //----- Constructors --------------------
865 DataPointInfo() {}
866
867 DataPointInfo(Data<X,Y> item, X x, Y y, PartOf partOf) {
868 this.dataItem = item;
869 this.x = x;
870 this.y = y;
871 this.partOf = partOf;
872 }
873
874 DataPointInfo(boolean dropDown) {
875 this.dropDown = dropDown;
876 }
877
878 void setValues(Data<X,Y> item, X x, Y y, double dx, double dy,
879 PartOf partOf, boolean skipSymbol, boolean lineTo) {
880 this.dataItem = item;
881 this.x = x;
882 this.y = y;
883 this.displayX = dx;
884 this.displayY = dy;
885 this.partOf = partOf;
886 this.skipSymbol = skipSymbol;
887 this.lineTo = lineTo;
888 }
889
890 public final X getX() {
891 return x;
892 }
893
894 public final Y getY() {
895 return y;
896 }
897 }
898
899 // To indicate if the data point belongs to the current or the previous series.
900 private static enum PartOf {
901 CURRENT,
902 PREVIOUS
903 }
904
905 // -------------- STYLESHEET HANDLING --------------------------------------
906
907 private static class StyleableProperties {
908
909 private static final CssMetaData<StackedAreaChart<?, ?>, Boolean> CREATE_SYMBOLS =
910 new CssMetaData<StackedAreaChart<?, ?>, Boolean>("-fx-create-symbols",
911 BooleanConverter.getInstance(), Boolean.TRUE) {
912 @Override
913 public boolean isSettable(StackedAreaChart<?,?> node) {
914 return node.createSymbols == null || !node.createSymbols.isBound();
915 }
916
917 @Override
918 public StyleableProperty<Boolean> getStyleableProperty(StackedAreaChart<?,?> node) {
919 return (StyleableProperty<Boolean>)(WritableValue<Boolean>)node.createSymbolsProperty();
920 }
921 };
922
923 private static final List<CssMetaData<? extends Styleable, ?>> STYLEABLES;
924
925 static {
926 final List<CssMetaData<? extends Styleable, ?>> styleables =
927 new ArrayList<CssMetaData<? extends Styleable, ?>>(XYChart.getClassCssMetaData());
928 styleables.add(CREATE_SYMBOLS);
929 STYLEABLES = Collections.unmodifiableList(styleables);
930
931 }
932 }
933
934 /**
935 * @return The CssMetaData associated with this class, which may include the
936 * CssMetaData of its super classes.
937 * @since JavaFX 8.0
938 */
939 public static List<CssMetaData<? extends Styleable, ?>> getClassCssMetaData() {
940 return StyleableProperties.STYLEABLES;
941 }
942
943 /**
944 * {@inheritDoc}
945 * @since JavaFX 8.0
946 */
947 @Override
948 public List<CssMetaData<? extends Styleable, ?>> getCssMetaData() {
949 return getClassCssMetaData();
950 }
951
952 }