[英]Oracles JavaFX example with mouse click position label wrong?
在http://docs.oracle.com/javafx/2/charts/pie-chart.htm,Oracle建議使用
caption.setTranslateX(e.getSceneX());
caption.setTranslateY(e.getSceneY());
將標簽放置在單擊鼠標的位置。。但這根本不起作用。 請參見以下打印屏幕以獲取證明:
在您引用的示例代碼中 , PieChart
和標題Label
都直接放置在作為場景根的Group
中。 因此,在應用轉換之前, Label
的位置為(0,0)
( Scene
左上角),因此通過將其轉換為(e.getSceneX(), e.getSceneY())
將其移動到鼠標的位置。
如果您的布局不同,則相同的計算不一定會起作用。 為了更廣泛的解決方案,放在一個圖表,字幕Group
,然后調用sceneToLocal(...)
在Group
翻譯的現場協調,以在正確的坐標Group
:
import javafx.application.Application;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.event.EventHandler;
import javafx.geometry.Insets;
import javafx.geometry.Point2D;
import javafx.geometry.Pos;
import javafx.scene.Group;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.scene.chart.PieChart;
import javafx.scene.control.Button;
import javafx.scene.control.Label;
import javafx.scene.control.TextField;
import javafx.scene.input.MouseEvent;
import javafx.scene.layout.BorderPane;
import javafx.scene.layout.HBox;
import javafx.scene.paint.Color;
import javafx.scene.shape.Circle;
import javafx.scene.shape.Rectangle;
import javafx.stage.Stage;
public class PieChartSample extends Application {
@Override
public void start(Stage stage) {
BorderPane root = new BorderPane();
ObservableList<PieChart.Data> pieChartData =
FXCollections.observableArrayList(
new PieChart.Data("Grapefruit", 13),
new PieChart.Data("Oranges", 25),
new PieChart.Data("Plums", 10),
new PieChart.Data("Pears", 22),
new PieChart.Data("Apples", 30));
final PieChart chart = new PieChart(pieChartData);
chart.setTitle("Imported Fruits");
final Label caption = new Label("");
caption.setTextFill(Color.DARKORANGE);
caption.setStyle("-fx-font: 24 arial;");
Group chartWithCaption = new Group(chart, caption);
for (final PieChart.Data data : chart.getData()) {
data.getNode().addEventHandler(MouseEvent.MOUSE_PRESSED,
new EventHandler<MouseEvent>() {
@Override public void handle(MouseEvent e) {
Point2D locationInScene = new Point2D(e.getSceneX(), e.getSceneY());
Point2D locationInParent = chartWithCaption.sceneToLocal(locationInScene);
caption.relocate(locationInParent.getX(), locationInParent.getY());
caption.setText(String.valueOf(data.getPieValue()) + "%");
}
});
}
root.setCenter(chartWithCaption);
// Just some stuff to change the overall layout:
HBox controls = new HBox(5);
controls.setPadding(new Insets(10));
controls.setAlignment(Pos.CENTER);
controls.getChildren().addAll(new Label("Some other stuff here"), new TextField(), new Button("OK"));
root.setTop(controls);
root.setPadding(new Insets(0, 0, 10, 40));
root.setLeft(new Circle(25, Color.SALMON));
Scene scene = new Scene(root);
stage.setTitle("Imported Fruits");
stage.setWidth(600);
stage.setHeight(500);
stage.setScene(scene);
stage.show();
}
public static void main(String[] args) {
launch(args);
}
}
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