JavaFXでのスケーリングのテスト用アプリ

DpiTestApp.java

package sample;

import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.stage.Stage;

public class DpiTestApp extends Application {

    @Override
    public void start(Stage primaryStage) throws Exception{
        FXMLLoader loader = new FXMLLoader(getClass().getResource("DpiTestView.fxml"));
        Parent root = loader.load();
        primaryStage.setTitle("Dpi Test App");
        primaryStage.setScene(new Scene(root));
        primaryStage.show();
    }


    public static void main(String[] args) {
        launch(args);
    }
}

DpiTestView.fxml

<?xml version="1.0" encoding="UTF-8"?>

<?import java.lang.*?>
<?import javafx.geometry.*?>
<?import javafx.scene.control.*?>
<?import javafx.scene.layout.*?>
<?import javafx.scene.text.*?>

<BorderPane maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="240.0"
            prefWidth="420.0" xmlns="http://javafx.com/javafx/8" xmlns:fx="http://javafx.com/fxml/1"
            fx:controller="sample.DpiTestViewController">
    <top>
        <Label text="High DPI Test App" BorderPane.alignment="CENTER_LEFT">
            <font>
                <Font size="36.0"/>
            </font>
        </Label>
    </top>
    <padding>
        <Insets bottom="10.0" left="10.0" right="10.0" top="10.0"/>
    </padding>
    <bottom>
        <HBox alignment="CENTER_LEFT" prefHeight="100.0" spacing="10.0" BorderPane.alignment="CENTER">
            <children>
                <Button mnemonicParsing="false" text="Button001" fx:id="sampleButton" onAction="#loadScaleInformation"/>
                <Label text="Button size:"/>
                <Label fx:id="buttonWidth"/>
                <Label text="x"/>
                <Label fx:id="buttonHeight"/>
            </children>
        </HBox>
    </bottom>
    <center>
        <GridPane vgap="10.0" BorderPane.alignment="CENTER">
            <columnConstraints>
                <ColumnConstraints hgrow="NEVER" minWidth="10.0" prefWidth="100.0"/>
                <ColumnConstraints hgrow="SOMETIMES" minWidth="10.0" prefWidth="100.0"/>
            </columnConstraints>
            <rowConstraints>
                <RowConstraints minHeight="10.0" prefHeight="30.0" valignment="BOTTOM" vgrow="SOMETIMES"/>
                <RowConstraints minHeight="10.0" prefHeight="30.0" valignment="TOP" vgrow="SOMETIMES"/>
            </rowConstraints>
            <children>
                <Label text="Current DPI:"/>
                <Label text="Scene size:" GridPane.rowIndex="1"/>
                <Label text="" GridPane.columnIndex="1" fx:id="currentDpi"/>
                <HBox spacing="10.0" GridPane.columnIndex="1" GridPane.rowIndex="1" GridPane.valignment="TOP">
                    <children>
                        <Label fx:id="sceneWidth"/>
                        <Label text="x"/>
                        <Label fx:id="sceneHeight"/>
                    </children>
                </HBox>
            </children>
        </GridPane>
    </center>
</BorderPane>

DpiTestViewController.java

package sample;

import javafx.event.ActionEvent;
import javafx.fxml.Initializable;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.Label;
import javafx.stage.Screen;

import java.net.URL;
import java.util.ResourceBundle;

public class DpiTestViewController implements Initializable {

    public Label buttonWidth;

    public Label buttonHeight;

    public Label sceneWidth;

    public Label sceneHeight;

    public Button sampleButton;

    public Label currentDpi;

    @Override
    public void initialize(URL url, ResourceBundle resourceBundle) {
    }

    public void loadScaleInformation(ActionEvent actionEvent) {
        Scene scene = sceneWidth.getScene();
        sceneWidth.setText(Double.toString(scene.getWidth()));
        sceneHeight.setText(Double.toString(scene.getHeight()));
        buttonWidth.setText(Double.toString(sampleButton.getWidth()));
        buttonHeight.setText(Double.toString(sampleButton.getHeight()));
        Screen screen = Screen.getPrimary();
        currentDpi.setText(String.valueOf(screen.getDpi()));
    }

}