How to zoom a JPanel and its components?

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How to zoom a JPanel and its components?

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#1 by (1 votes)

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I am creating a tag editor in java and I want to make the user zoom in the work area ( JPanel ) as well as the components that are inside.

Here my code:

Graphics2D g2 = (Graphics2D) PPanel1.getGraphics();
int w = PPanel1.getWidth();
int h = PPanel1.getHeight();

double scale = 1.25;

g2.translate(w / 2, h / 2);
g2.scale(scale, scale);
g2.translate(-w / 2, -h / 2);

PPanel1.paintComponents(g2);

PPanel1.updateUI();

PPanel1.setSize(PPanel1.getWidth() * 1.25, PPanel1.getHeight() * 1.25);
            CZoom.setSelectedIndex(cambiarPosicion);

d = new Dimension(PPanel1.getWidth(), PPanel1.getHeight());
PPanel1.setSize(d);

Zooms the components if I do not change the size of the panel, but when I resize, it does not zoom the components.

java

asked by Giovani Preciado Ortiz 05.09.2017 в 16:21

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1 answer

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score 1 · Answer 1

Several things:

PPanel1.setSize(PPanel1.getWidth() * 1.25, PPanel1.getHeight() * 1.25);
CZoom.setSelectedIndex(cambiarPosicion);

The first instruction should not work, since the width and height that receive the setSize method are integers (and there you are implicitly converting to double by multiplying by 1.25).
CZoom and changePosition are two variables whose origin I do not know.

That said, you do not specify in what kind of event you want the resizing to occur, so I've solved it with MouseEntered and MouseExited (more information < a href="https://docs.oracle.com/javase/7/docs/api/java/awt/event/MouseListener.html" title="Mouse Listener"> here ):

private void etiqueta1MouseEntered(java.awt.event.MouseEvent evt) {                                       
    etiqueta1.setFont(new Font(
            etiqueta1.getFont().getName(),
            etiqueta1.getFont().getStyle(),
            etiqueta1.getFont().getSize() * 2));

    panel1.setSize(panel1.getSize().width + 100, panel1.getSize().height + 100);
    this.setSize(this.getSize().width + 100, this.getSize().height + 100);
}                                      

private void etiqueta1MouseExited(java.awt.event.MouseEvent evt) {                                      
    etiqueta1.setFont(new Font(
            etiqueta1.getFont().getName(),
            etiqueta1.getFont().getStyle(),
            etiqueta1.getFont().getSize() / 2));

    panel1.setSize(panel1.getSize().width - 100, panel1.getSize().height - 100);
    this.setSize(this.getSize().width - 100, this.getSize().height - 100);
}

Initial Status

When I move the mouse over the label, what I do is change the font size to double the current one, and increase the size of the class object JPanel and of its own JFrame in 100 pixels.

When I leave the label I reverse the process, leaving everything as it was.