2
通過在圖表上單擊鼠標左鍵我想通過創建文本區域矩形來寫文本，以便能夠調整大小和移動。JavaFx 2.x：如何在圖表上書寫文字？
任何幫助非常感激
編輯：嗨sarcan非常感謝你的善意回應。
我試過你的代碼，它編譯並繪製了帶有註釋的面積圖，非常棒！
我現在需要以一種方式更改您的代碼，以便能夠在點擊鼠標左鍵時鍵入鍵盤鍵，而不是像現在一樣打印註釋。
下面是完整的代碼
import javafx.application.Application;
import javafx.beans.InvalidationListener;
import javafx.beans.Observable;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.event.EventHandler;
import javafx.scene.Node;
import javafx.scene.Scene;
import javafx.scene.chart.AreaChart;
import javafx.scene.chart.Axis;
import javafx.scene.chart.NumberAxis;
import javafx.scene.chart.XYChart;
import javafx.scene.chart.XYChart.Data;
import javafx.scene.chart.XYChart.Series;
import javafx.scene.control.Label;
import javafx.scene.input.MouseButton;
import javafx.scene.input.MouseEvent;
import javafx.scene.layout.Pane;
import javafx.scene.layout.StackPane;
import javafx.scene.paint.Color;
import javafx.scene.shape.Circle;
import javafx.stage.Stage;
/**
*
* @author sarcan
*/
public class SampleApp extends Application {
public class SampleChart extends AreaChart<Number, Number> {
public SampleChart() {
super(new NumberAxis(), new NumberAxis());
getXAxis().setLabel("X");
getYAxis().setLabel("Y");
final Series<Number, Number> data = new Series<Number, Number>();
data.setName("Dummy data");
data.getData().addAll(
new Data<Number, Number>(0,4),
new Data<Number, Number>(1,5),
new Data<Number, Number>(2,6),
new Data<Number, Number>(3,5),
new Data<Number, Number>(4,5),
new Data<Number, Number>(5,7),
new Data<Number, Number>(6,8),
new Data<Number, Number>(7,9),
new Data<Number, Number>(8,7)
);
getData().add(data);
}
}
public class ChartAnnotationNode {
private final Node _node;
private double _x;
private double _y;
public ChartAnnotationNode(final Node node, final double x, final double y) {
_node = node;
_x = x;
_y = y;
}
public Node getNode() {
return _node;
}
public double getX() {
return _x;
}
public double getY() {
return _y;
}
public void setX(final double x) {
_x = x;
}
public void setY(final double y) {
_y = y;
}
}
public class ChartAnnotationOverlay extends Pane {
private ObservableList<ChartAnnotationNode> _annotationNodes;
private XYChart<Number, Number> _chart;
public ChartAnnotationOverlay(final XYChart<Number, Number> chart) {
_chart = chart;
/* Create a list to hold your annotations */
_annotationNodes = FXCollections.observableArrayList();
/* This will be our update listener, to be invoked whenever the chart changes or annotations are added */
final InvalidationListener listener = new InvalidationListener() {
@Override
public void invalidated(final Observable observable) {
update();
}
};
_chart.needsLayoutProperty().addListener(listener);
_annotationNodes.addListener(listener);
/* Add new annotations by shift-clicking */
setOnMouseClicked(new EventHandler<MouseEvent>() {
@Override
public void handle(final MouseEvent mouseEvent) {
if (mouseEvent.getButton() == MouseButton.PRIMARY && mouseEvent.isShiftDown())
addAnnotation(mouseEvent.getX(), mouseEvent.getY());
}
});
}
/**
* Invoked whenever the chart changes or annotations are added. This basically does a relayout of the annotation nodes.
*/
private void update(){
getChildren().clear();
final Axis<Number> xAxis = _chart.getXAxis();
final Axis<Number> yAxis = _chart.getYAxis();
/* For each annotation, add a circle indicating the position and the custom node right next to it */
for (ChartAnnotationNode annotation : _annotationNodes) {
final double x = xAxis.localToParent(xAxis.getDisplayPosition(annotation.getX()), 0).getX() + _chart.getPadding().getLeft();
final double y = yAxis.localToParent(0,yAxis.getDisplayPosition(annotation.getY())).getY() + _chart.getPadding().getTop();
final Circle indicator = new Circle(3);
indicator.setStroke(Color.BLUEVIOLET);
indicator.setCenterX(x);
indicator.setCenterY(y);
getChildren().add(indicator);
final Node node = annotation.getNode();
getChildren().add(node);
node.relocate(x + 10, y - node.prefHeight(Integer.MAX_VALUE)/2);
node.autosize();
}
}
/**
* Add a new annotation for the given display coordinate.
*/
private void addAnnotation(final double displayX, final double displayY){
final Axis<Number> xAxis = _chart.getXAxis();
final Axis<Number> yAxis = _chart.getYAxis();
final double x = (xAxis.getValueForDisplay(xAxis.parentToLocal(displayX, 0).getX() - _chart.getPadding().getLeft())).doubleValue();
final double y = (yAxis.getValueForDisplay(yAxis.parentToLocal(0, displayY).getY() - _chart.getPadding().getTop())).doubleValue();
if (xAxis.isValueOnAxis(x) && yAxis.isValueOnAxis(y))
_annotationNodes.add(new ChartAnnotationNode(new Label("Annotation "+System.currentTimeMillis()), x, y));
}
}
@Override
public void start(final Stage stage) throws Exception {
final SampleChart chart = new SampleChart();
final ChartAnnotationOverlay overlay = new ChartAnnotationOverlay(chart);
final StackPane stackPane = new StackPane();
stackPane.getChildren().addAll(chart, overlay);
final Scene scene = new Scene(stackPane);
stage.setScene(scene);
stage.setWidth(800);
stage.setHeight(600);
stage.show();
}
public static void main(String[] args) {
Application.launch(args);
}
}
嗨sarcan，請你給我提供一些代碼作爲例子嗎？非常感謝你 –
我添加了一些示例代碼 - 不是你想要的一切，但希望足以讓你開始。 – sarcan