Chart JavaFX, my hover Label are hidden by the edges of chart - charts

Question

I have a problem again with the JavaFX Chart : D
Context :
I had Popup/Label on my chart to display the value on hover : JavaFX LineChart Hover Values (Jewelsea answer)
Problem :
But when the point are near the edges of chart, the popup is hidden by them.
The chart with problem, I highlighted the edges of chart.
This is a problem, because my popup is bigger and display more informations (x value, y value and the data serie)
Possible solutions :
May I can check where the edges are, and if the popup is hide. In this case, I should shift the popup. But when I look doc, I didn't found the right method :
XYChart
XYChart.Data#nodeProperty
May I can put the popup above the chart. Like z-index in CSS.
The code :
import javafx.application.Application;
import javafx.collections.*;
import javafx.event.EventHandler;
import javafx.scene.*;
import javafx.scene.chart.*;
import javafx.scene.control.Label;
import javafx.scene.input.MouseEvent;
import javafx.scene.layout.StackPane;
import javafx.scene.paint.Color;
import javafx.stage.Stage;
/**
* Displays a LineChart which displays the value of a plotted Node when you hover over the Node.
* #author original, jewelsea https://gist.github.com/jewelsea
*/
public class LineChartWithHover extends Application {
#SuppressWarnings("unchecked")
#Override public void start(Stage stage) {
final LineChart lineChart = new LineChart(
new NumberAxis(), new NumberAxis(),
FXCollections.observableArrayList(
new XYChart.Series(
"My portfolio",
FXCollections.observableArrayList(
plot(0, 14, 15, 24, 34, 36, 22, 55, 43, 17, 29, 25)
)
)
)
);
lineChart.setCursor(Cursor.CROSSHAIR);
lineChart.setTitle("Stock Monitoring, 2013");
stage.setScene(new Scene(lineChart, 500, 400));
stage.show();
System.out.println("test 1 = "+lineChart.getProperties());
}
/** #return plotted y values for monotonically increasing integer x values, starting from x=1 */
public ObservableList<XYChart.Data<Integer, Integer>> plot(int... y) {
final ObservableList<XYChart.Data<Integer, Integer>> dataset = FXCollections.observableArrayList();
int i = 0;
while (i < y.length) {
final XYChart.Data<Integer, Integer> data = new XYChart.Data<>(i + 1, y[i]);
data.setNode(
new HoveredThresholdNode(
(i == 0) ? 0 : y[i-1],
y[i]
)
);
dataset.add(data);
i++;
}
return dataset;
}
/** a node which displays a value on hover, but is otherwise empty */
class HoveredThresholdNode extends StackPane {
HoveredThresholdNode(int priorValue, int value) {
setPrefSize(15, 15);
final Label label = createDataThresholdLabel(priorValue, value);
setOnMouseEntered(new EventHandler<MouseEvent>() {
#Override public void handle(MouseEvent mouseEvent) {
getChildren().setAll(label);
setCursor(Cursor.NONE);
toFront();
}
});
setOnMouseExited(new EventHandler<MouseEvent>() {
#Override public void handle(MouseEvent mouseEvent) {
getChildren().clear();
setCursor(Cursor.CROSSHAIR);
}
});
}
private Label createDataThresholdLabel(int priorValue, int value) {
final Label label = new Label(value + "");
label.getStyleClass().addAll("default-color0", "chart-line-symbol", "chart-series-line");
label.setStyle("-fx-font-size: 20; -fx-font-weight: bold;");
if (priorValue == 0) {
label.setTextFill(Color.DARKGRAY);
} else if (value > priorValue) {
label.setTextFill(Color.FORESTGREEN);
} else {
label.setTextFill(Color.FIREBRICK);
}
label.setMinSize(Label.USE_PREF_SIZE, Label.USE_PREF_SIZE);
return label;
}
}
public static void main(String[] args) { launch(args); }
}
Thank you in advance ! And my apologies about my english, still learning !

Answer 1

I have been looking on the JavaFX CSS reference guide and I could'nt find anything to simply solve your problem.
A possible solution is to translate your symbol depending on how near it is to the max or min value.
I wrote something like this, based on your code :
/**
* Displays a LineChart which displays the value of a plotted Node when you hover over the Node.
* #author original, jewelsea https://gist.github.com/jewelsea
*/
public class LineChartWithHover extends Application {
#SuppressWarnings("unchecked")
#Override public void start(Stage stage) {
final LineChart lineChart = new LineChart(
new NumberAxis(), new NumberAxis(),
FXCollections.observableArrayList(
new XYChart.Series(
"My portfolio",
FXCollections.observableArrayList(
plot(0, 14, 15, 24, 34, 36, 22, 55, 43, 17, 29, 25)
)
)
)
);
lineChart.setCursor(Cursor.CROSSHAIR);
lineChart.setTitle("Stock Monitoring, 2013");
stage.setScene(new Scene(lineChart, 500, 400));
stage.show();
System.out.println("test 1 = "+lineChart.getProperties());
}
/** #return plotted y values for monotonically increasing integer x values, starting from x=1 */
public ObservableList<XYChart.Data<Integer, Integer>> plot(Integer... y) {
final ObservableList<XYChart.Data<Integer, Integer>> dataset = FXCollections.observableArrayList();
int i = 0;
List<Integer> list = Arrays.asList(y);
int min = Collections.min(list);
int max = Collections.max(list);
int minThreshold = 5;
int maxThreshold = 5;
while (i < y.length) {
final XYChart.Data<Integer, Integer> data = new XYChart.Data<>(i + 1, y[i]);
int topMargin = 0;
if(y[i] <= min + minThreshold) {
topMargin = -50;
} else if (y[i] >= max - maxThreshold) {
topMargin = 50;
}
StackPane stackPane = new HoveredThresholdNode(
(i == 0) ? 0 : y[i-1],
y[i],
topMargin
);
data.setNode(stackPane);
dataset.add(data);
i++;
}
return dataset;
}
/** a node which displays a value on hover, but is otherwise empty */
class HoveredThresholdNode extends StackPane {
HoveredThresholdNode(int priorValue, int value, int topMargin) {
setPrefSize(15, 15);
final Label label = createDataThresholdLabel(priorValue, value);
setOnMouseEntered(new EventHandler<MouseEvent>() {
#Override public void handle(MouseEvent mouseEvent) {
getChildren().setAll(label);
setCursor(Cursor.NONE);
toFront();
setMargin(label, new Insets(topMargin,0,0,0));
}
});
setOnMouseExited(new EventHandler<MouseEvent>() {
#Override public void handle(MouseEvent mouseEvent) {
getChildren().clear();
setCursor(Cursor.CROSSHAIR);
}
});
}
private Label createDataThresholdLabel(int priorValue, int value) {
final Label label = new Label(value + "");
label.getStyleClass().addAll("default-color0", "chart-line-symbol", "chart-series-line");
label.setStyle("-fx-font-size: 20; -fx-font-weight: bold;");
if (priorValue == 0) {
label.setTextFill(Color.DARKGRAY);
} else if (value > priorValue) {
label.setTextFill(Color.FORESTGREEN);
} else {
label.setTextFill(Color.FIREBRICK);
}
label.setMinSize(Label.USE_PREF_SIZE, Label.USE_PREF_SIZE);
return label;
}
}
public static void main(String[] args) { launch(args); }
}
Basically, I am just saying that all values <= min+5 and >= max-5 must be translated.
The +/- 5 is arbitrary and should be calculated from the ticks gap and plot scale to have a perfect repositioning. Anyway, without performing any maths, it is still quite satisfying.

Answer 2

Based on Mr Kwoinkwoin solution, I wrote my own.
Im not sure if its possible to optimize it or improve it. But seems to be working for me so far.
import java.time.Instant;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.time.Month;
import java.time.ZoneId;
import java.time.ZonedDateTime;
import java.time.format.DateTimeFormatter;
import javafx.application.Application;
import javafx.collections.ObservableList;
import javafx.event.EventHandler;
import javafx.geometry.Insets;
import javafx.scene.Cursor;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.scene.chart.LineChart;
import javafx.scene.chart.NumberAxis;
import javafx.scene.chart.NumberAxis.DefaultFormatter;
import javafx.scene.chart.XYChart.Data;
import javafx.scene.chart.XYChart.Series;
import javafx.scene.control.Label;
import javafx.scene.input.MouseEvent;
import javafx.scene.layout.StackPane;
import static javafx.scene.layout.StackPane.setMargin;
import javafx.stage.Stage;
import javafx.util.StringConverter;
public class StockLineChartApp extends Application {
private LineChart<Number, Number> chart;
private Series<Number, Number> series;
private NumberAxis xAxis;
private ZonedDateTime time;
public StockLineChartApp() {
time = ZonedDateTime.of(LocalDateTime.of(LocalDate.of(2000, Month.JANUARY, 1), LocalTime.NOON), ZoneId.systemDefault());
}
public Parent createContent() {
xAxis = new NumberAxis();
xAxis.setLabel("Date/Time");
xAxis.setForceZeroInRange(false);
xAxis.setAutoRanging(true);
xAxis.setTickLabelFormatter(new StringConverter<Number>() {
#Override
public String toString(Number t) {
long longValue = t.longValue();
ZonedDateTime zd = convertLongToZonedDateTime(longValue);
String formatDate = formatDate(zd, "dd/MM/yyyy");
return formatDate;
}
#Override
public Number fromString(String string) {
ZonedDateTime dl = ZonedDateTime.parse(string, DateTimeFormatter.ofPattern("dd/MM/yyyy"));
long toEpochMilli = dl.toEpochSecond();
//DateTimeFormatter.ofPattern(string).p
return toEpochMilli;
}
});
final NumberAxis yAxis = new NumberAxis();
yAxis.setAutoRanging(true);
chart = new LineChart<>(xAxis, yAxis);
chart.setCursor(Cursor.CROSSHAIR);
chart.setAlternativeRowFillVisible(true);
chart.setAlternativeColumnFillVisible(true);
// setup chart
//final String stockLineChartCss= getClass().getResource("StockLineChart.css").toExternalForm();
//chart.getStylesheets().add(stockLineChartCss);
chart.setCreateSymbols(true);
chart.setAnimated(true);
chart.setLegendVisible(true);
chart.setTitle("ACME Company Stock");
yAxis.setLabel("Share Price");
yAxis.setTickLabelFormatter(new DefaultFormatter(yAxis, "$", null));
// add starting data
series = new Series<>();
series.setName("Data por Peça");
for (double m = 0; m < (10); m++) {
long data = nextTime();
addData(data, (long) (Math.random() * 10));
System.out.println(data);
}
//chart.
chart.getData().add(series);
//chart.getData().add(hourDataSeries);
return chart;
}
private void addData(long x, long y) {
Data<Number, Number> data = new Data<Number, Number>(x, y);
series.getData().add(data);
ZonedDateTime zd = convertLongToZonedDateTime(x);
String formatDate = formatDate(zd, "dd/MM/yyyy");
//String text = "(" + formatDate + ";" + y + ")";
String text = y + "";
if (text.length() > 4) {
text = text.substring(0, 4);
}
String t = formatDate + "\nValor: " + text;
data.setNode(new HoveredThresholdNode(t, data));
}
public static long convertZonedDateTimeToLong(ZonedDateTime zonedDateTime) {
long e = zonedDateTime.toInstant().toEpochMilli();
return e;
}
private long nextTime() {
time = time.plusYears(10);
return convertZonedDateTimeToLong(time);
}
#Override
public void start(Stage primaryStage) throws Exception {
Parent createContent = createContent();
//
final StackPane pane = new StackPane();
pane.getChildren().add(createContent);
final Scene scene = new Scene(pane, 500, 400);
//new ZoomManager(pane, chart, series);
//
primaryStage.setScene(scene);
primaryStage.show();
}
public static String formatDate(ZonedDateTime ts, String format) {
try {
if (ts == null) {
return "";
}
String format1 = ts.format(DateTimeFormatter.ofPattern(format));
return format1;
} catch (Exception ex) {
ex.printStackTrace();
}
return "";
}
public static ZonedDateTime convertLongToZonedDateTime(long e) {
Instant i = Instant.ofEpochMilli(e);
ZonedDateTime ofInstant = ZonedDateTime.ofInstant(i, ZoneId.systemDefault());
return ofInstant;
}
/**
* Java main for when running without JavaFX launcher
*/
public static void main(String[] args) {
launch(args);
}
public class HoveredThresholdNode extends StackPane {
//Reference
private Data<Number, Number> data;
private Label label;
private String value;
public HoveredThresholdNode(String value, Data<Number, Number> data) {
this.data = data;
this.value = value;
this.label = new Label(value);
this.label.getStyleClass().clear();
this.getStyleClass().clear();
this.label.setStyle("-fx-font-size: 12; fx-text-fill: black;");
this.label.getStyleClass().addAll("default-color0", "chart-line-symbol", "chart-series-line");
this.label.setWrapText(true);
this.label.setMinSize(Label.USE_PREF_SIZE, Label.USE_PREF_SIZE);
setOnMouseEntered(new EventHandler<MouseEvent>() {
#Override
public void handle(MouseEvent mouseEvent) {
getChildren().setAll(label);
toFront();
boolean close_top = false, close_right = false, close_bottom = false, close_left = false;
long min_x = Long.MAX_VALUE;
long max_x = Long.MIN_VALUE;
long min_y = Long.MAX_VALUE;
long max_y = Long.MIN_VALUE;
ObservableList<Series<Number, Number>> chartSeries = chart.getData();
for (Series<Number, Number> s : chartSeries) {
ObservableList<Data<Number, Number>> chartData = s.getData();
for (Data<Number, Number> d : chartData) {
Number xValue = d.getXValue();
Number yValue = d.getYValue();
long kx = xValue.longValue();
long ky = yValue.longValue();
if (kx < min_x) {
min_x = kx;
}
if (kx > max_x) {
max_x = kx;
}
if (ky < min_y) {
min_y = ky;
}
if (ky > max_y) {
max_y = ky;
}
}
}
if (data.getXValue().longValue() - max_x == 0) {
close_right = true;
}
if (data.getXValue().longValue() - min_x == 0) {
close_left = true;
}
if (data.getYValue().longValue() - min_y == 0) {
close_bottom = true;
}
if (data.getYValue().longValue() - max_y == 0) {
close_top = true;
}
// System.out.println("\n");
// System.out.println(" close_right " + close_right);
// System.out.println(" close_left " + close_left);
// System.out.println(" close_bottom " + close_bottom);
// System.out.println(" close_top " + close_top);
double top = 0;
double right = 0;
double bottom = 0;
double left = 0;
if (close_top) {
top = 50;
}
if (close_bottom) {
bottom = 50;
}
if (close_right) {
right = 50;
}
if (close_left) {
left = 50;
}
setMargin(label, new Insets(top, right, bottom, left));
}
});
setOnMouseExited(new EventHandler<MouseEvent>() {
#Override
public void handle(MouseEvent mouseEvent) {
getChildren().clear();
}
});
}
public HoveredThresholdNode copy() {
HoveredThresholdNode copy = new HoveredThresholdNode(value, data);
return copy;
}
}
}