Question

我正在解决一个家庭作业问题，我正在使用Java和Java FX制作圆柱体。圆柱体将根据窗口的大小进行调整。

我首先在顶部创建一个椭圆，在底部创建两个垂直线，在底部创建两个弧线（一个虚线）。我将它们绑定到窗格上，因此随着窗口大小的改变它们也会改变。

当我尝试运行它时，程序可以正常编译（在Intelli-J中），显示新的Java窗口，但是该程序似乎挂在那里。我无法访问该窗口，只能在Mac的程序栏中看到它。

由于某种原因，当我在添加所有形状之前分别向窗格添加文本时，它工作正常吗？

代码在下面。任何帮助将不胜感激！

import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.layout.Pane;
import javafx.scene.paint.Color;
import javafx.scene.shape.Arc;
import javafx.scene.shape.ArcType;
import javafx.scene.shape.Ellipse;
import javafx.scene.shape.Line;
import javafx.scene.text.Text;
import javafx.stage.Stage;

public class CylinderResize extends Application {
    @Override
    public void start(Stage primaryStage) {
        //Create Pane
        Pane pane = new Pane();
        Scene scene = new Scene(pane);

        //Create Elipse for top
        Ellipse ellipse = new Ellipse();
        //Make the Center X property half of the pane width
        ellipse.centerXProperty().bind(pane.widthProperty().divide(2));
        //Height starts 1/3 the way down
        ellipse.centerYProperty().bind(pane.heightProperty().divide(3));
        //X Radius  is 1/4 the width property and y radius is 1/8 WIDTH property
        ellipse.radiusXProperty().bind(pane.widthProperty().divide(4));
        ellipse.radiusYProperty().bind(pane.heightProperty().divide(8));
        ellipse.setStroke(Color.BLACK);
        ellipse.setFill(Color.WHITE);

        //Create Solid arch for  bottom
        Arc solidArc = new Arc();
        solidArc.centerXProperty().bind(pane.widthProperty().divide(2));
        solidArc.centerYProperty().bind(pane.heightProperty().multiply(2).divide(3));
        solidArc.radiusXProperty().bind(pane.widthProperty().divide(4));
        solidArc.radiusYProperty().bind(pane.heightProperty().divide(8));
        solidArc.setStartAngle(180);
        solidArc.setLength(180);
        solidArc.setType(ArcType.OPEN);
        solidArc.setStroke(Color.BLACK);
        solidArc.setFill(Color.WHITE);

        //Create dashed line for bottom
        Arc dashedArc = new Arc();
        dashedArc.centerXProperty().bind(pane.widthProperty().divide(2));
        dashedArc.centerYProperty().bind(pane.heightProperty().multiply(2).divide(3));
        dashedArc.radiusXProperty().bind(pane.widthProperty().divide(4));
        dashedArc.radiusYProperty().bind(pane.heightProperty().divide(8));
        dashedArc.setStartAngle(0);
        dashedArc.setLength(180);
        dashedArc.setType(ArcType.OPEN);
        dashedArc.setFill(Color.WHITE);
        dashedArc.setStroke(Color.BLACK);

        dashedArc.getStrokeDashArray().addAll(6.0, 21.0);


        //Create Vertical Lines for the sides
        Line leftLine = new Line();
        leftLine.startXProperty().bind(ellipse.centerXProperty().subtract(ellipse.radiusXProperty()));
        leftLine.startYProperty().bind(ellipse.centerYProperty());
        leftLine.endXProperty().bind(solidArc.centerXProperty().subtract(solidArc.radiusXProperty()));
        leftLine.endYProperty().bind(solidArc.centerYProperty());
        leftLine.setStroke(Color.BLACK);

        Line rightLine = new Line();
        rightLine.startXProperty().bind(ellipse.centerXProperty().add(ellipse.radiusXProperty()));
        rightLine.startYProperty().bind(ellipse.centerYProperty());
        rightLine.endXProperty().bind(solidArc.centerXProperty().add(solidArc.radiusXProperty()));
        rightLine.endYProperty().bind(solidArc.centerYProperty());
        rightLine.setStroke(Color.BLACK);

        //Test with a text box
        Text text = new Text(25, 25, "WHY IS THIS REQUIRED?????");

        //Add the objects to the pane
        pane.getChildren().add(text); //WHEN I TAKE THIS LINE OUT, THE PROGRAM JUST HANGS.........
        pane.getChildren().addAll(ellipse, solidArc, dashedArc, leftLine, rightLine);

        //Set Up Stage
        primaryStage.setTitle("Ellipse that scales");
        primaryStage.setScene(scene);
        primaryStage.show();

    }
}

Answer 1

不是您的程序挂起，而是阶段无法调整为可以通过设置高度和宽度来解决的任何问题

primaryStage.setWidth(200);
primaryStage.setHeight(200);

文字修复的原因是因为它的基本尺寸使您可以在删除它时看到，而再也看不到了，因为它太小了

我认为这个项目做得还不错

除非我先在JAVA / Java FX中

1 个答案: