Get width and height of a dynamically loaded image once it's done loading?!

hello : :
well... i'm taking my first shots at flex after programming
in flash for a year now. it's been fun and i've been picking up on
things pretty well (or so i think), but i come across something
today that i used to be able to do in my as2 programming and don't
know how to do in as3...
in flex, i'm loading an image into an image control (by using
"myImgControl.load(urlString)"). i have a "complete" parameter on
the image control that calls a function just fine after the image
is loaded, but if i try and check the hight and width of the loaded
image once it loads, it comes back as zero. how can i get the
height and width of the image after it's loaded?!
in flash/as2 i used to do this little trick/work-around i
found in a forum (kirupa.com, i think) to find out the width and
height once the loaded image listener checked the loading process
and came back "complete"... in the code below, "imgLoader" is the
movieClip the image was loaded using
imgLoaderListener.loadClip(urlString, imgLoader).
quote:
iTot = imgLoader.getBytesTotal();
iLoad = imgLoader.getBytesLoaded();
if (iLoad == iTot && iTot > 4) {
imgH = imgLoader._height;
imgW = imgLoader._width;
that all make sense?!
basically, it's as simple as this: i need to find something
similar to the above for as3 that will tell me the width and height
of a dynamically loaded image after it's done loading...
so there ya have it. i appreciate any help any of you can
throw my way! thank you so much for even reading this!
: : michael

I assume you have probably already figured this out, but just
in case, there should be an event to listen for after which you can
get the height and width information successfully. I can't remember
the exact name, however. Experiment and see which one works
time-wise.

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* ImagePrinter.java
* Created on Feb 27, 2008
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 * @since version XXX
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 return _pageCount;
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 try
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 catch (Exception e)
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 * @since Mar 25, 2008
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 * @since Mar 25, 2008
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 * Created By: TSO1207 - John Loyd
 * @since Mar 25, 2008
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 return _imgWidth;
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 public void setImage(Image image)
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        entryPanel.add(fontTypeDrop);
        fontColorDrop = new JComboBox(colors);
        fontColorDrop.setBounds(rjX, yRow10, dWidth, height);
        fontColorDrop.addFocusListener(new focusListen());
        entryPanel.add(fontColorDrop);
        //the eleventh row (label)
        JLabel fontSizeLabel = new JLabel("Select Font Size:");
        fontSizeLabel.setBounds(ljX, yRow11, mWidth, height);
        entryPanel.add(fontSizeLabel);
        //the final row (entry)
        fontSizeText = new JTextField("12", 2);
        fontSizeText.setBounds(ljX, yRow12, tWidth, height);
        fontSizeText.addFocusListener(new focusListen());
        entryPanel.add(fontSizeText);
        //display panel code
        //use test parameters
        //these will later be retrieved from the entries
        drawCanvas.setParams("Hello", "roundRect", Color.red,
                            100, 100, "Serif", Color.black, 12);
        //set the applet to visible
        //set to visible and display
        entire.setSize(800, 600);
        entire.setVisible(true);
    }   //end the init method
    //declare an inner class to handle events
    private class focusListen implements FocusListener
        //supply the implementation of the actionPerformed method
        //pass an event variable as the argument
        public void focusLost(FocusEvent e)
        { JOptionPane.showMessageDialog(null, "Focus lost."); }
        //declare an empty focus gained function
        public void focusGained(FocusEvent e) {}
    }   //end testListen class
}   //end DemoShape class

Sorry for glossing over your code sample, particularly as it looks like one of the best I've seen so far on the forums, but I'm pretty sure the answer you are looking for is as follows:
Java doesn't render a component until paint() is called so until then you are not going to have any size settings because the jvm simply doesn't know how big the visual component is. This makes sense when you think about what the jvm is doing. The layout manager controls the display of the components depending on the settings it is supplied. So until it knows how many components you want, where, what kind of spacing, etc, etc, etc, how can the size be determined.
The true cycle of events is therefore:
create an instance of DisplayCanvas,
add it to your container,
make the container visible (which renders the component),
get the size of the DisplayCanvas instance.
You are being hampered because your desired chain of events is:
create an instance of DisplayCanvas,
get the size of the DisplayCanvas instance,
add it to your container,
make the container visible.
This state of affairs is highly annoying and then leads to the next question "what do we do about that?". There is a cunning trick which is to get the jvm to render the component to an off-screen image, thus calculating the dimensions of the component so that you can do precisely the kind of enquiry on the object that you have been looking for. It should be noted that this may not be the visual size for all the reasons given above, but it is the "preferred size" for the component. Check the Swing tutorials and have a look at the section on Layout Managers for a run down on what that means.
Anyway, we can use this handy code sample to determine the preferred size for your component. Notice the call to "paint()" (normally you would never make a direct call to paint() in swing) and the "g.dispose()" to free resources:
package com.coda.swing.desktool.gui;
import java.awt.Component;
import java.awt.Dimension;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
public class PaintUtil
     public PaintUtil()
          super();
     public static Component paintBuffer(Component comp)
          Dimension size = comp.getPreferredSize();
          comp.setSize(size);
          BufferedImage img = new BufferedImage(size.width, size.height, BufferedImage.TYPE_INT_ARGB);
          Graphics2D g2 = img.createGraphics();
          comp.paint(g2);
          g2.dispose();
          return comp;
}Before you make a call to getWidth() or getHeight() put in a call to "PaintUtil.paintBuffer(this);" and see what happens.
By the way, I can't claim credit for this code ... and I really wish I could remember where I got it from myself so I can thank them :)

Get image properties (width and height)

Hi there,
Does anyone know if there is a way that I could get the width and height of an image to be displayed in a JSP.

Image has methods to get the width & height.

[svn:osmf:] 10085: Fixing video width and height getting reset when there' s no true dimensional change reported by 'onMetaData'.

Revision: 10085
Author:   [email protected]
Date:     2009-09-09 07:39:54 -0700 (Wed, 09 Sep 2009)
Log Message:
Fixing video width and height getting reset when there's no true dimensional change reported by 'onMetaData'.
Modified Paths:
    osmf/trunk/framework/MediaFramework/org/openvideoplayer/video/VideoElement.as

hi their i have tried your last code but their is a problem with it on my pc that when i click the send video button it gives the error related to vector,
Vector deviceList = CaptureDeviceManager.getDeviceList()
di = (CaptureDeviceInfo)deviceList.firstElement();
returns zero.
please help my email address is [email protected]
kindly send me an email regarding the solution of my problem. i am using 'creative web cam' over XP windows.

Getting maximum width and height of frame

In my Flash CS4 application I have a problem working out the maximum x and y coordinates of the display objects that have been created in a frame using the frame editor. This is the sequence
1. Using the frame editor on the timeline, I create a keyframe with a mixture of library symbols and text/graphics which are not symbols.
2. In AS3 I take all of the screen objects and make them children of a Sprite that I created in my AS3 script. I then delete the objects off the screen and pass the parent Sprite to a class that I use to manage the screen.
3. In the manage screen class the first thing I do is go through the child display objects to work out the maximum x and y coordinates so that I can centralise them on the screen later on.
The problem is that I'm not able to work out the maximum x & y coordinates correctly. There is no problem with the symbol objects, I just add the x and width for example, for the maximum x coordinate. But for the non symbol objects this does not work. They appear to be combined in some way and the x/y & width/height do not seem to correspond to anything in the frame editor.
Is there a writeup anywhere on how Flash manages the graphics/text obects which are not symbols and are created by the editor in keyframes on the timeline? Finding the maximum x and y coordinates of a screen full of objects should be fairly simple, but I cannot see a way of doing it at the moment.
Jerry

On my JPanel I want to draw stuff, and for this I need to know the > > width and height of the JPanelIf you are drawing stuff, then you are in control off
how big you want to draw the stuff. You can make the
panel as big or small as you want and do your drawing
accordingly.But doesn't the Layoutmanager of the frame set the size of the added panel according to the rest of the layout, or am I way off here?
Do I need to setPreferredSize() or anything on thepanel before pack()?
Try it and see what happens. If you don't give the
panel a size then the pack() method basically ignores
it as you have found out.Perhaps if I gave an example, you could point me in the right direction? The code below creates a JPanel of size 200x200, and draws a ball at a random spot on the panel. But since the frame is way bigger than 200x200 the panel gets stretched by the layoutmanager (right?). So what I really want to use when I calculate the x and y position is the width and height of the panel as it is displayed in the frame.
Here goes:
import javax.swing.*;
import java.awt.*;
class MyFrame extends JFrame {
public MyFrame() {
    super("A ball");
    JPanel panel = new JPanel();
    panel.setSize(200, 200);
    int x = (int)(Math.random()*200);
    int y = (int)(Math.random()*200);
    panel.add(new Ball(x, y));    // Object Ball draws a ball at x,y
    getContentPane().add(panel, BorderLayout.CENTER);
    setSize(640, 480);
    show();
public static void main(String[] args) {
    new MyFrame();
}

How to get the width and height of the selected rectangle

Hi,
I need to get the width and height of the selected rectangle in indesign cs3 and display the values in a dialog box for user verification.
Regards,
saran

Hi Saran,
InterfacePtr<IGeometry> itemGeo ( objectUIDRef, UseDefaultIID() );
PMRect ItemCoord = itemGeo->GetStrokeBoundingBox();
PMReal width = ItemCoord->Width();
PMReal height = ItemCoord->Height();

Get width and height of a dynamically loaded image once it's done loading?!

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