嘗試這個例子...用於位置在場景的中間就可以計算出寬度以下公式:
layoutxcanvas =(widthscene/2) - (widthcanvas/2)
layoutycanvas =(heightscene/2) - (heightcanvas/2)
import java.awt.Graphics2D;
import java.awt.Paint;
import javafx.application.Application;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.scene.Scene;
import javafx.scene.canvas.Canvas;
import javafx.scene.control.Button;
import javafx.scene.layout.Pane;
import javafx.scene.layout.StackPane;
import javafx.scene.paint.Color;
import javafx.stage.Stage;
public class JavaFXApplication1 extends Application {
@Override
public void start(Stage primaryStage) {
Pane paneCanvas = new Pane();
final Canvas canvas = new Canvas();
paneCanvas.setStyle("-fx-background-color: black;");
canvas.setHeight(32);
canvas.setWidth(32);
canvas.getGraphicsContext2D().setFill(Color.WHITE);
canvas.getGraphicsContext2D().fillRect(0, 0, 32, 32);
canvas.setLayoutX((300/2)-(32/2));
canvas.setLayoutY((300/2)-(32/2));
paneCanvas.getChildren().add(canvas);
Scene scene=new Scene(paneCanvas,300,300);
primaryStage.setTitle("Hello World!");
primaryStage.setScene(scene);
primaryStage.show();
}
/**
* @param args the command line arguments
*/
public static void main(String[] args) {
launch(args);
}