yeah, this would do.
Nik
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Loading multiple images from One Image Map
Hi there.
Here's my problem: I need to load many images into my gui. I would like to load one gif file that contains an imageMap of all the icons needed, and load one text file that tells me the xy coordinates of all these icons. I then would like to create a seperate image for each icon, and place them in a repository (hashtable). I figured I would save time by only loading one gif file as opposed to 50 to 100 gif files. The less the program needs to access the harddrive the better right?
I can load the file fine, and get the text description ok, but I'm stuck on how to create the seperate images from the one imageMap. Normally, if my class extended Component, then I could just call createImage, but I'm under the impression that this will only work if that component is visible. Besides I'm trying to have a small class here, and I don't need the overhead of Component.
Does anyone have a clue how I would do this??
Thanks
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Answers
It looks like it should work but I must be doing something wrong. I load the imagemap in correctly and I verify that it is the correct size (in this case 640X480). And then I attempt to create the smaller images out of the larger one using your method, but all the images return that the Width and Height are -1.
Heres what I used:
iTemp = Toolkit.getDefaultToolkit(
System.out.println("Temp : W = " + iTemp.getWidth(this) + " H=" + iTemp.getHeight(this));
where x,y,w, and h are all known and correct values.
Why does it always return -1?
Thanks
The problem stems from the fact that the getImage returns immediatelly and you cannot be sure the bits that comprise the image have arrived. That is why MediaTracker is needed. If this 'loading' makes you application GUI freeze, use another thread, and change the GUI as appropriate when the image arrives.
Cheers,
Nik
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by: OviPosted on 2000-02-17 at 22:27:40ID: 2533845
You have here a method of mine which can read an gif image wich contains 45 icons arranged in line. You see in the code "treeBuilder" object. This is the instantiation of a class which extends java.applet.Applet;
Also I supose that each image (icon) is a square with 16 width&heigth ( non english speaker).
public void buildImgVector()
{
if(iconArray == null)
iconArray = new Image[45];
Object obj;
try
{
Image image = treeBuilder.getImage(treeB
treeBuilder.prepareImage(i
MediaTracker mediatracker = new MediaTracker(treeBuilder);
mediatracker.addImage(imag
mediatracker.waitForID(0);
int j = 0;
do
iconArray[j] = treeBuilder.getToolkit().c
while(++j < 45);
return;
}
catch(Exception _ex)
{
obj = null;
}
}