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@jewelsea
Created May 10, 2013 06:19
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Reports the co-ordinates over which the mouse is hovering in a JavaFX line chart.
import javafx.application.Application;
import javafx.collections.FXCollections;
import javafx.event.EventHandler;
import javafx.geometry.Insets;
import javafx.geometry.Pos;
import javafx.scene.*;
import javafx.scene.chart.*;
import javafx.scene.control.Label;
import javafx.scene.input.MouseEvent;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;
public class LineChartWithHoverCoords extends Application {
@Override public void start(Stage stage) {
stage.setTitle("Line Chart Sample");
final LineChart<Number, Number> lineChart = createChart();
Label cursorCoords = createCursorGraphCoordsMonitorLabel(lineChart);
stage.setScene(
new Scene(
layoutScene(
lineChart,
cursorCoords
)
)
);
stage.show();
}
private VBox layoutScene(LineChart<Number, Number> lineChart, Label cursorCoords) {
VBox layout = new VBox(10);
layout.setPadding(new Insets(10));
layout.setAlignment(Pos.CENTER);
layout.getChildren().setAll(
cursorCoords,
lineChart
);
return layout;
}
private LineChart<Number, Number> createChart() {
final NumberAxis xAxis = new NumberAxis();
final NumberAxis yAxis = new NumberAxis();
xAxis.setLabel("Number of Month");
final LineChart<Number,Number> lineChart =
new LineChart<>(xAxis,yAxis);
lineChart.setTitle("Stock Monitoring, 2010");
XYChart.Series<Number, Number> series = new XYChart.Series<>(
"My portfolio", FXCollections.<XYChart.Data<Number, Number>>observableArrayList(
new XYChart.Data<Number, Number>(1, 23),
new XYChart.Data<Number, Number>(2, 14),
new XYChart.Data<Number, Number>(3, 15),
new XYChart.Data<Number, Number>(4, 24),
new XYChart.Data<Number, Number>(5, 34),
new XYChart.Data<Number, Number>(6, 36),
new XYChart.Data<Number, Number>(7, 22),
new XYChart.Data<Number, Number>(8, 45),
new XYChart.Data<Number, Number>(9, 43),
new XYChart.Data<Number, Number>(10, 17),
new XYChart.Data<Number, Number>(11, 29),
new XYChart.Data<Number, Number>(12, 25)
)
);
lineChart.getData().add(series);
return lineChart;
}
private Label createCursorGraphCoordsMonitorLabel(LineChart<Number, Number> lineChart) {
final Axis<Number> xAxis = lineChart.getXAxis();
final Axis<Number> yAxis = lineChart.getYAxis();
final Label cursorCoords = new Label();
final Node chartBackground = lineChart.lookup(".chart-plot-background");
for (Node n: chartBackground.getParent().getChildrenUnmodifiable()) {
if (n != chartBackground && n != xAxis && n != yAxis) {
n.setMouseTransparent(true);
}
}
chartBackground.setOnMouseEntered(new EventHandler<MouseEvent>() {
@Override public void handle(MouseEvent mouseEvent) {
cursorCoords.setVisible(true);
}
});
chartBackground.setOnMouseMoved(new EventHandler<MouseEvent>() {
@Override public void handle(MouseEvent mouseEvent) {
cursorCoords.setText(
String.format(
"(%.2f, %.2f)",
xAxis.getValueForDisplay(mouseEvent.getX()),
yAxis.getValueForDisplay(mouseEvent.getY())
)
);
}
});
chartBackground.setOnMouseExited(new EventHandler<MouseEvent>() {
@Override public void handle(MouseEvent mouseEvent) {
cursorCoords.setVisible(false);
}
});
xAxis.setOnMouseEntered(new EventHandler<MouseEvent>() {
@Override public void handle(MouseEvent mouseEvent) {
cursorCoords.setVisible(true);
}
});
xAxis.setOnMouseMoved(new EventHandler<MouseEvent>() {
@Override public void handle(MouseEvent mouseEvent) {
cursorCoords.setText(
String.format(
"x = %.2f",
xAxis.getValueForDisplay(mouseEvent.getX())
)
);
}
});
xAxis.setOnMouseExited(new EventHandler<MouseEvent>() {
@Override public void handle(MouseEvent mouseEvent) {
cursorCoords.setVisible(false);
}
});
yAxis.setOnMouseEntered(new EventHandler<MouseEvent>() {
@Override public void handle(MouseEvent mouseEvent) {
cursorCoords.setVisible(true);
}
});
yAxis.setOnMouseMoved(new EventHandler<MouseEvent>() {
@Override public void handle(MouseEvent mouseEvent) {
cursorCoords.setText(
String.format(
"y = %.2f",
yAxis.getValueForDisplay(mouseEvent.getY())
)
);
}
});
yAxis.setOnMouseExited(new EventHandler<MouseEvent>() {
@Override public void handle(MouseEvent mouseEvent) {
cursorCoords.setVisible(false);
}
});
return cursorCoords;
}
public static void main(String[] args) {
launch(args);
}
}
@jewelsea
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