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package ensemble.samples.charts.candlestick;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import javafx.animation.FadeTransition;
import javafx.collections.ObservableList;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.scene.Node;
import javafx.scene.chart.Axis;
import javafx.scene.chart.NumberAxis;
import javafx.scene.chart.XYChart;
import javafx.scene.shape.LineTo;
import javafx.scene.shape.MoveTo;
import javafx.scene.shape.Path;
import javafx.util.Duration;
/**
* A candlestick chart is a style of bar-chart used primarily to describe price movements of a security, derivative,
* or currency over time.
*
* The Data Y value is used for the opening price and then the close, high and low values are stored in the Data's
* extra value property using a CandleStickExtraValues object.
*/
public class CandleStickChart extends XYChart {
// -------------- CONSTRUCTORS ----------------------------------------------
/**
* Construct a new CandleStickChart with the given axis.
*
* @param xAxis The x axis to use
* @param yAxis The y axis to use
*/
public CandleStickChart(Axis xAxis, Axis yAxis) {
super(xAxis, yAxis);
getStylesheets().add(
CandleStickChart.class.getResource("CandleStickChart.css").toExternalForm());
setAnimated(false);
xAxis.setAnimated(false);
yAxis.setAnimated(false);
}
/**
* Construct a new CandleStickChart with the given axis and data.
*
* @param xAxis The x axis to use
* @param yAxis The y axis to use
* @param data The data to use, this is the actual list used so any changes to it will be reflected in the chart
*/
public CandleStickChart(Axis xAxis, Axis yAxis, ObservableList> data) {
this(xAxis, yAxis);
setData(data);
}
// -------------- METHODS ------------------------------------------------------------------------------------------
/** Called to update and layout the content for the plot */
@Override protected void layoutPlotChildren() {
// we have nothing to layout if no data is present
if (getData() == null) {
return;
}
// update candle positions
for (int seriesIndex = 0; seriesIndex < getData().size(); seriesIndex++) {
XYChart.Series series = getData().get(seriesIndex);
Iterator> iter = getDisplayedDataIterator(series);
Path seriesPath = null;
if (series.getNode() instanceof Path) {
seriesPath = (Path) series.getNode();
seriesPath.getElements().clear();
}
while (iter.hasNext()) {
XYChart.Data item = iter.next();
double x = getXAxis().getDisplayPosition(getCurrentDisplayedXValue(item));
double y = getYAxis().getDisplayPosition(getCurrentDisplayedYValue(item));
Node itemNode = item.getNode();
CandleStickExtraValues extra = (CandleStickExtraValues) item.getExtraValue();
if (itemNode instanceof Candle && extra != null) {
Candle candle = (Candle) itemNode;
double close = getYAxis().getDisplayPosition(extra.getClose());
double high = getYAxis().getDisplayPosition(extra.getHigh());
double low = getYAxis().getDisplayPosition(extra.getLow());
// calculate candle width
double candleWidth = -1;
if (getXAxis() instanceof NumberAxis) {
NumberAxis xa = (NumberAxis) getXAxis();
candleWidth = xa.getDisplayPosition(xa.getTickUnit()) * 0.90; // use 90% width between ticks
}
// update candle
candle.update(close - y, high - y, low - y, candleWidth);
candle.updateTooltip(item.getYValue().doubleValue(), extra.getClose(), extra.getHigh(), extra.getLow());
// position the candle
candle.setLayoutX(x);
candle.setLayoutY(y);
}
if (seriesPath != null) {
if (seriesPath.getElements().isEmpty()) {
seriesPath.getElements().add(new MoveTo(x, getYAxis().getDisplayPosition(extra.getAverage())));
} else {
seriesPath.getElements().add(new LineTo(x, getYAxis().getDisplayPosition(extra.getAverage())));
}
}
}
}
}
@Override protected void dataItemChanged(XYChart.Data item) {
}
@Override protected void dataItemAdded(XYChart.Series series, int itemIndex, XYChart.Data item) {
Node candle = createCandle(getData().indexOf(series), item, itemIndex);
if (shouldAnimate()) {
candle.setOpacity(0);
getPlotChildren().add(candle);
// fade in new candle
FadeTransition ft = new FadeTransition(Duration.millis(500), candle);
ft.setToValue(1);
ft.play();
} else {
getPlotChildren().add(candle);
}
// always draw average line on top
if (series.getNode() != null) {
series.getNode().toFront();
}
}
@Override protected void dataItemRemoved(XYChart.Data item, XYChart.Series series) {
final Node candle = item.getNode();
if (shouldAnimate()) {
// fade out old candle
FadeTransition ft = new FadeTransition(Duration.millis(500), candle);
ft.setToValue(0);
ft.setOnFinished((ActionEvent actionEvent) -> {
getPlotChildren().remove(candle);
});
ft.play();
} else {
getPlotChildren().remove(candle);
}
}
@Override protected void seriesAdded(XYChart.Series series, int seriesIndex) {
// handle any data already in series
for (int j = 0; j < series.getData().size(); j++) {
XYChart.Data item = series.getData().get(j);
Node candle = createCandle(seriesIndex, item, j);
if (shouldAnimate()) {
candle.setOpacity(0);
getPlotChildren().add(candle);
// fade in new candle
FadeTransition ft = new FadeTransition(Duration.millis(500), candle);
ft.setToValue(1);
ft.play();
} else {
getPlotChildren().add(candle);
}
}
// create series path
Path seriesPath = new Path();
seriesPath.getStyleClass().setAll("candlestick-average-line", "series" + seriesIndex);
series.setNode(seriesPath);
getPlotChildren().add(seriesPath);
}
@Override protected void seriesRemoved(XYChart.Series series) {
// remove all candle nodes
for (XYChart.Data d : series.getData()) {
final Node candle = d.getNode();
if (shouldAnimate()) {
// fade out old candle
FadeTransition ft = new FadeTransition(Duration.millis(500), candle);
ft.setToValue(0);
ft.setOnFinished((ActionEvent actionEvent) -> {
getPlotChildren().remove(candle);
});
ft.play();
} else {
getPlotChildren().remove(candle);
}
}
}
/**
* Create a new Candle node to represent a single data item
*
* @param seriesIndex The index of the series the data item is in
* @param item The data item to create node for
* @param itemIndex The index of the data item in the series
* @return New candle node to represent the give data item
*/
private Node createCandle(int seriesIndex, final XYChart.Data item, int itemIndex) {
Node candle = item.getNode();
// check if candle has already been created
if (candle instanceof Candle) {
((Candle) candle).setSeriesAndDataStyleClasses("series" + seriesIndex, "data" + itemIndex);
} else {
candle = new Candle("series" + seriesIndex, "data" + itemIndex);
item.setNode(candle);
}
return candle;
}
/**
* This is called when the range has been invalidated and we need to update it. If the axis are auto
* ranging then we compile a list of all data that the given axis has to plot and call invalidateRange() on the
* axis passing it that data.
*/
@Override
protected void updateAxisRange() {
// For candle stick chart we need to override this method as we need to let the axis know that they need to be able
// to cover the whole area occupied by the high to low range not just its center data value
final Axis xa = getXAxis();
final Axis ya = getYAxis();
List xData = null;
List yData = null;
if (xa.isAutoRanging()) {
xData = new ArrayList();
}
if (ya.isAutoRanging()) {
yData = new ArrayList();
}
if (xData != null || yData != null) {
for (XYChart.Series series : getData()) {
for (XYChart.Data data : series.getData()) {
if (xData != null) {
xData.add(data.getXValue());
}
if (yData != null) {
CandleStickExtraValues extras = (CandleStickExtraValues) data.getExtraValue();
if (extras != null) {
yData.add(extras.getHigh());
yData.add(extras.getLow());
} else {
yData.add(data.getYValue());
}
}
}
}
if (xData != null) {
xa.invalidateRange(xData);
}
if (yData != null) {
ya.invalidateRange(yData);
}
}
}
}
