When trying to include an external class that extends Pane in a main class in JavaFX, simply adding it may not achieve the

Question

When trying to include an external class that extends Pane in a main class in JavaFX, simply adding it may not achieve the

My primary class is as follows:

public class Digital_Analog_Clock_Beta_1 extends Application
{

    @Override
    public void start(Stage primaryStage)
    {
        double outerBoxWidth = 500, outerBoxHeight = outerBoxWidth / 2.5;
        Rectangle outerBox = new Rectangle(0, 0, outerBoxWidth, outerBoxHeight);
        outerBox.setId("outer-box");

        Rectangle part1 = new Rectangle(0, 0, outerBoxWidth * .35, outerBoxHeight);
        part1.setId("partition");
        Rectangle part2 = new Rectangle(outerBoxWidth * .35, 0, outerBoxWidth * .05, outerBoxHeight);
        part2.setId("partition-alternate");
        Rectangle part3 = new Rectangle(outerBoxWidth * .4, 0, outerBoxWidth * .35, outerBoxHeight);
        part3.setId("partition");
        Rectangle part4 = new Rectangle(outerBoxWidth * .75, 0, outerBoxWidth * .35, outerBoxHeight);
        part4.setId("partition-alternate");

        double bigNumWidth = outerBoxWidth * .35;
        double digitWidth = (.9 * bigNumWidth / 2) * 0.95;
        double digitHeight = .9*outerBoxHeight;
        
                
        Digit Digit1 = new Digit(outerBoxWidth*.1,outerBoxHeight*.1,digitWidth,digitHeight);
        Digit1.bottom.setId("digits");
        Digit1.c.setFill(Color.AQUA);

        Pane pane = new Pane();
        pane.getChildren().add(outerBox);
        pane.getChildren().addAll(part1, part2, part3, part4);
        //pane.setId("background");
        
        pane.getChildren().add(Digit1);

        Scene scene = new Scene(pane, outerBoxWidth, outerBoxHeight);
        scene.getStylesheets().add(getClass().getResource("styleSheet.css").toExternalForm());

        primaryStage.setTitle("Digital Analog Clock Beta 1");
        primaryStage.setScene(scene);
        primaryStage.show();
    }

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

}

Below is my Digit class :

public class Digit extends Pane
{

    double startX, startY, digitWidth, digitHeight, lineWidth;

    public Digit(double startX, double startY, double digitWidth, double digitHeight)
    {
        this.startX = startX;
        this.startY = startY;
        this.digitWidth = digitWidth;
        this.digitHeight = digitHeight;
        lineWidth = digitHeight / 20;
        getChildren().addAll(top,middle,bottom,upperLeft,upperRight,lowerLeft,lowerRight, c);
    }

    Polygon top = new Polygon(startX, startY, startX + digitWidth, startY, startX + digitWidth - lineWidth, startY + lineWidth * .95, startX + lineWidth, startY + lineWidth * .95);
    Polygon middle = new Polygon(startX + lineWidth, startY + digitHeight / 2 - lineWidth / 2 + lineWidth * .05,
            startX + digitWidth - lineWidth, startY + digitHeight / 2 - lineWidth / 2 + lineWidth * .05,
            startX + digitWidth - lineWidth * .05, startY + digitHeight, startX + digitWidth - lineWidth, startY + digitHeight / 2 + lineWidth / 2 - lineWidth * .05,
            startX + lineWidth, startY + digitHeight / 2 + lineWidth / 2 - lineWidth * .05, startX + lineWidth * .05, startY + digitHeight / 2);
    Polygon bottom = new Polygon(startX, startY + digitHeight, startX + digitWidth, startY + digitHeight, startX + digitWidth - lineWidth, startY + digitHeight - lineWidth * .95,
            startX + lineWidth, startY + digitHeight - lineWidth * .95);
    Polygon upperLeft = new Polygon(startX, startY, startX + lineWidth * .95, startY + lineWidth, startX + lineWidth * .95, startY + digitHeight / 2 - lineWidth / 2, startX, startY + digitHeight / 2);
    Polygon lowerLeft = new Polygon(startX, startY + digitHeight / 2, startX + lineWidth * .95, startY + digitHeight / 2 + lineWidth / 2, startX + lineWidth * .95, startY + digitHeight - lineWidth,
            startX, startY + digitHeight);
    Polygon upperRight = new Polygon(startX + digitWidth, startY, startX + digitWidth, startY + digitHeight / 2, startX + digitWidth - lineWidth * .95, startY + digitHeight / 2 - lineWidth / 2,
            startX + digitWidth - lineWidth * .95, startY + lineWidth);
    Polygon lowerRight = new Polygon(startX+digitWidth,startY+digitHeight/2,startX+digitWidth,startY+digitHeight,startX+digitWidth-lineWidth*.95,startY+digitHeight-lineWidth,
            startX+digitWidth-lineWidth*.95,startY+lineWidth/2+digitHeight/2);
    
   Circle c = new Circle(100.0f,100.0f,1000.0f);
    
}

And here's the styleSheet.css :

#outer-box
{
     -fx-fill: #353839; /* Onyx */
}

#outer-box-t
{
    -fx-fill: rgba(0,0,0,0); /* transparent */
}

#partition
{
    -fx-fill: rgba(200,200,205,0.25)  /* #C8C8CD Blue Grey a : 0.5*/
}

#partition-alternate
{
    -fx-fill: rgba(0,0,0,0); /* transparent i.e. Onyx */
}

#background
{
    -fx-background-color: #C53151; /* Dingy Dungeon */
}

#digits
{
    -fx-fill : #66FF66; /* Screamin' Green */   
     -fx-stroke: #C53151; /* Dingy Dungeon */
    -fx-stroke-width : 3;
}

Output window can be seen https://i.sstatic.net/VEh2E.jpg

The digits are meant to appear over the background I have created. The numerous rectangles in the main class serve the purpose of spacing out the digits accordingly. Although I added polygons and even a circle at the bottom of my Digit.java class, they do not show up in the output window. Having asked a similar question on Stack Overflow previously, it worked for a test case but not in this actual program.

Update: Everything except for the circle is missing from the output window.

java css javafx

Answer 1

Answer №1

When initializing instance variables inline, they are set before the constructor is called. For example, when initializing top, all other variables like startx, starty, digitWidth, digitHeight, and lineWidth will be set to zero.

For more information refer to JLS, section 12.5:

Before returning the newly created object, the constructor goes through a process to initialize it:

Assign arguments of the constructor to parameter variables.

If there is an explicit invocation of another constructor using this, evaluate the arguments and repeat these steps recursively. If the recursive invocation fails, the procedure stops; otherwise, continue to step 5.

If there is no explicit invocation using this in the constructor for a non-Object class, invoke a superclass constructor using super and repeat these steps recursively. If the invocation fails, stop the procedure with an exception. Otherwise, move to step 4.

Execute instance initializers and variable initializers for the class, setting the values of initializers to corresponding instance variables in order of appearance in source code. Any exceptions while executing initializers halt the process. Move on to step 5 if successful.

Finish executing the rest of the constructor's body. If there are any abrupt terminations, the procedure halts accordingly; otherwise, completes normally.

Note that assigning instance variable initializers precedes executing the constructor body.

To improve organization, move polygon initialization to the constructor:

public class digit extends Pane {

    double startX, startY, digitWidth, digitHeight, lineWidth;

    Polygon top ;
    Polygon middle ;
    Polygon bottom ;
    Polygon upperLeft ;
    Polygon upperRight ;
    Polygon upperLeft ;
    Polygon lowerLeft ;

    public digit(double startX, double startY, double digitWidth, double digitHeight)
    {
        this.startX = startX;
        this.startY = startY;
        this.digitWidth = digitWidth;
        this.digitHeight = digitHeight;
        lineWidth = digitHeight / 20;
        getChildren().addAll(top,middle,bottom,upperLeft,upperRight,lowerLeft,lowerRight, c);
        this.top = new Polygon(startX, startY, startX + digitWidth, startY, startX + digitWidth - lineWidth, startY + lineWidth * .95, startX + lineWidth, startY + lineWidth * .95);

        // etc...
    }

}

Answer 2

When initializing instance variables inline, they are set before the constructor is called. For example, when initializing top, all other variables like startx, starty, digitWidth, digitHeight, and lineWidth will be set to zero.

For more information refer to JLS, section 12.5:

Before returning the newly created object, the constructor goes through a process to initialize it:

Assign arguments of the constructor to parameter variables.

If there is an explicit invocation of another constructor using this, evaluate the arguments and repeat these steps recursively. If the recursive invocation fails, the procedure stops; otherwise, continue to step 5.

If there is no explicit invocation using this in the constructor for a non-Object class, invoke a superclass constructor using super and repeat these steps recursively. If the invocation fails, stop the procedure with an exception. Otherwise, move to step 4.

Execute instance initializers and variable initializers for the class, setting the values of initializers to corresponding instance variables in order of appearance in source code. Any exceptions while executing initializers halt the process. Move on to step 5 if successful.

Finish executing the rest of the constructor's body. If there are any abrupt terminations, the procedure halts accordingly; otherwise, completes normally.

Note that assigning instance variable initializers precedes executing the constructor body.

To improve organization, move polygon initialization to the constructor:

public class digit extends Pane {

    double startX, startY, digitWidth, digitHeight, lineWidth;

    Polygon top ;
    Polygon middle ;
    Polygon bottom ;
    Polygon upperLeft ;
    Polygon upperRight ;
    Polygon upperLeft ;
    Polygon lowerLeft ;

    public digit(double startX, double startY, double digitWidth, double digitHeight)
    {
        this.startX = startX;
        this.startY = startY;
        this.digitWidth = digitWidth;
        this.digitHeight = digitHeight;
        lineWidth = digitHeight / 20;
        getChildren().addAll(top,middle,bottom,upperLeft,upperRight,lowerLeft,lowerRight, c);
        this.top = new Polygon(startX, startY, startX + digitWidth, startY, startX + digitWidth - lineWidth, startY + lineWidth * .95, startX + lineWidth, startY + lineWidth * .95);

        // etc...
    }

}

When trying to include an external class that extends Pane in a main class in JavaFX, simply adding it may not achieve the

Answer №1

Similar questions

Determining the dimensions of form elements in an inline layout using Bootstrap 3.1

A div set to absolute positioning and a width of 100% will exceed the boundaries of a Bootstrap 4

Is it advantageous to employ several wrapper-divs inside section elements when working with HTML5 and CSS?

Styling text on top of an image using CSS

Steps to show submenus upon hovering over the main menu items

Backgrounds filled by nested <li> elements inside another <li> element

CSS: Revert INPUT Element Back to Default Width

Create widget that is resistant to inherited traits

Find elements within an array that include a specific string

Transforming JSON Structure into BasicDBObject

Tips for adding color to the <td> element in an ejs file using nodeJS

Struggling to align the push menu properly within the Bootstrap framework

Uncaught exceptions and throwables

Is there a way to transform this Java code into Node.js syntax?

Issues with PHP Form Email DeliveryIt seems that there is a

What could be causing the java.lang.NullPointerException to occur in my code?

Expand the div to fit the rest of the screen following the fixed-size navigation bar

Manipulate the timing of css animations using javascript

Is it feasible to block indent the second line of a URL?

Error: FileUriExposedException encountered while attempting to share a screenshot of a layout