There is an issue with the functionality of Java code that has been adapted from Javascript logic

Question

There is an issue with the functionality of Java code that has been adapted from Javascript logic

I'm currently using NetBeans8 IDE.

Check out this java script function from this Fiddle

 function animate() {
    xnow = parseInt(item.style.left);
    item.style.left = (xnow+1)+'px';
    ynow = parseInt(item.style.top);
    item.style.top = (ynow+Math.sin(2*Math.PI*(xnow/50))*10) + "px";
    setTimeout(animate,20);
}

The developer here creates a moving sine wave using JavaScript.

Following the same concept, with some minor modifications, I've written a Java program using timer t. The equation used is identical to the one above. However, my jRadioButton seems to be moving uncontrollably. Can a moving sine wave be achieved through this method?

Please assist me in resolving this issue. Thank you in advance.

Below is the snippet of my Java code:

Timer t = new Timer(10, new ActionListener() {                                                                                           
    @Override                                                                                                                           
    public void actionPerformed(ActionEvent e) {            
        // AL1 is the name given to radiobutton
        int xnow=AL1.getX()+1;
        int ynow=AL1.getY();
        ynow=(int) (ynow+Math.sin(2*Math.PI*(xnow/50))*10);
        AL1.setLocation(xnow, ynow);
    }                                                                                                                            
});  


private void formWindowOpened(java.awt.event.WindowEvent evt) {                                  
    // TODO add your handling code here:
    AL1.setLocation(0, 200);
    t.start();
}


javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
    layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
    .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
        .addContainerGap()
        .addComponent(Lpne, javax.swing.GroupLayout.DEFAULT_SIZE, 1030, Short.MAX_VALUE)
        .addContainerGap())
);
layout.setVerticalGroup(
    layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
    .addComponent(Lpne, javax.swing.GroupLayout.Alignment.TRAILING, javax.swing.GroupLayout.DEFAULT_SIZE, 551, Short.MAX_VALUE)
);

Could someone help bring my jRadioButton under control?

Thank you to everyone. This marks the final outcome.

javascript java netbeans-8 wave trigonometry

Answer 1

Answer №1

There are two key issues affecting your logic:

Layout: It is crucial to place your Swing Component within a container component that has no layout, essentially acting as a plane without any layout restrictions.
Division: The division operator in programming accepts two operands and returns a value. The return type of the division operation is determined by the operand's types. For example, int / short returns an int, while float / int returns a float.

In JavaScript, there is only one type which is number (a set of real numbers), so the result will always be a real number. However, in Java, if you define both operands as int, the result must also be an int. This means that:

30 / 50 = 0;

To ensure a decimal result, you need to make one of the operands a real number. In Java, you can use the Float type for this purpose:

30 / 50F = 0.6;

Here, 50F is a constant float value.

If you modify the code like this:

// Code snippet

within a container like this:

// Container setup

Your logic will then function similar to JavaScript.

Answer 2

There are two key issues affecting your logic:

Layout: It is crucial to place your Swing Component within a container component that has no layout, essentially acting as a plane without any layout restrictions.
Division: The division operator in programming accepts two operands and returns a value. The return type of the division operation is determined by the operand's types. For example, int / short returns an int, while float / int returns a float.

In JavaScript, there is only one type which is number (a set of real numbers), so the result will always be a real number. However, in Java, if you define both operands as int, the result must also be an int. This means that:

30 / 50 = 0;

To ensure a decimal result, you need to make one of the operands a real number. In Java, you can use the Float type for this purpose:

30 / 50F = 0.6;

Here, 50F is a constant float value.

If you modify the code like this:

// Code snippet

within a container like this:

// Container setup

Your logic will then function similar to JavaScript.

There is an issue with the functionality of Java code that has been adapted from Javascript logic

Answer №1

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