How to make image invisible and visible in applet

**KSBeyaz** · 11-30-2011, 05:22 PM

hey guys my question is basic.

How to make image invisible and visible in applet?

here is the code of image

Java Code:

public void paint(Graphics g)  

{ 	super.paint(g);
	try {base = getDocumentBase();
images[0]=getImage(base,"Hangman.gif");
} catch(Exception e){}

g.drawImage(images[0],650,20,this);


	  
}

**eRaaaa** · 11-30-2011, 06:25 PM

Insert an if-statement?
if(shouldPaint) {...draw your image...}

in your "control" code you can change the variable shouldPaint and after that --> call repaint()

btw: i would only draw the image at the paint method. I would load the image outside and only once!

**KSBeyaz** · 11-30-2011, 06:45 PM

i did hangman homework with gui now im doing it with applet

everything are okey excepts images.

i have 12 images. so i need to command which do invisible image.

isnt there a commond like that ?

**Norm** · 11-30-2011, 06:50 PM

Is an invisible image, an image that is not shown?
In your paint method, if you return after the call to super.paint() no image will be shown. It will be invisible.

**KSBeyaz** · 12-01-2011, 05:46 PM

hey guys,finnally i convert my gui hangman code to applet hangman code.

i put it on website here is the link:

http://users9.jabry.com/ksbeyaz/

sometimes pictures is reload slowly.

i want your feedbacks.
note(All text you must find is on "Turkish Words")

**KSBeyaz** · 12-04-2011, 01:46 AM

Although i upload all neccassary files ,if i dont enter website from my computer ,some part of this java homework dont be seen from different computers.

why this problem occur?

any suggestions?

**Norm** · 12-04-2011, 01:49 AM

some part of this java homework dont be seen from different computers.

Please explain.
Also can you add a language choice and add English, I spent one winter in Izmir but did not learn much Turkish.

**KSBeyaz** · 12-04-2011, 01:56 AM

yeah i will do it.but homework was for Turkish.

i have entered url with different computer and there should be ___ ___ ___ ___ on the center for length of size. and if player find correct letter ,for example A in text on the first there should be __A__ ____ ____ ____ but on diffferent computer it isnt appear like that it was ____ _____ _____ _____ after click "Sonraki" which mean "next" all of _____ gone.Moreover pictures reload slowly
any suggestion?

**Norm** · 12-04-2011, 02:04 AM

Hard to know what the problem with your code is without seeing it.

I've downloaded all the class files and images and will take a look.

**KSBeyaz** · 12-04-2011, 12:58 PM

thank you,waiting for your post

**Norm** · 12-04-2011, 02:27 PM

Can you post the code for your inner classes that are listeners for the buttons? My decompiler did not do a good job of creating the source for them.

**KSBeyaz** · 12-04-2011, 02:59 PM

i have sent you with private msg.
i think problem is occur because MyPanel class isnt working good on html websides.MyPanel class draw _____ and Letter which is found by player like that ___A___

must i include html to MyPanel class ? it extend by deneme class?

**Norm** · 12-04-2011, 04:58 PM

You should not load the images every time in the paint method. Move the code to the init() method and do it only once.

I tried many different method calls to cause the JVM to display the components that you had setVisible(false) and then later tried to setVisible(true). I found that if I called the validate() method for the container that was holding the panel that was holding the component that was just set visible, that they would be shown.

Java Code:

	
   		panels[zt] = new MyPanel(txt.charAt(zt));
        	pnl1.add(panels[zt]);
		panels[zt].setVisible(false);

Java Code:

        panels[tt].setVisible(true);
        pnl1.validate();  // THIS WORKS  <<<

**KSBeyaz** · 12-04-2011, 05:42 PM

Originally Posted by Norm

You should not load the images every time in the paint method. Move the code to the init() method and do it only once.

I tried many different method calls to cause the JVM to display the components that you had setVisible(false) and then later tried to setVisible(true). I found that if I called the validate() method for the container that was holding the panel that was holding the component that was just set visible, that they would be shown.

Java Code:

	
   		panels[zt] = new MyPanel(txt.charAt(zt));
        	pnl1.add(panels[zt]);
		panels[zt].setVisible(false);

Java Code:

        panels[tt].setVisible(true);
        pnl1.validate();  // THIS WORKS  <<<

so if i only add

Java Code:

pnl1.validate();  // THIS WORKS  <<<

it will work?
i didnt get it clearly.
may you explain a bit more plz?

what is validate() for ? what it do ?i see it first time.
ty

**Norm** · 12-04-2011, 05:48 PM

it will work?

Try it and see what happens.

what is validate() for

Read the API doc for the Component class.

**KSBeyaz** · 12-04-2011, 05:58 PM

it is said that Request that the component and its affected containers be laid out again. You should not generally need to invoke this method unless you explicitly change a component's size/alignment hints after it's visible or change a containment hierarchy after it is visible. Always invoke repaint after revalidate. okey ty for your help will try