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Topic: BImage resize (Read 366 times) |
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cc
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BImage resize
« on: Nov 20th, 2004, 10:27pm » |
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I can't seem to resize a BImage after it has been allocated. More specifically, I would like to resize an array of BImages, but I can't even find how to do it with one?
BImage[] imageset;
imageset = new BImage[IMG_COUNT];
for (int i=0; i < IMG_COUNT; i++)
imageset[i].resize ( nx, ny); // 
Am I missing something, or does this feature not exist yet?
Rama
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fjen
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Re: BImage resize
« Reply #1 on: Nov 20th, 2004, 11:09pm » |
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if it's not in the reference the most likely it's not there ... but sometimes there are hidden features like BGraphics:
Code:
BImage[] imageset;
imageset = new BImage[IMG_COUNT];
for (int i=0; i < IMG_COUNT; i++)
{
BGraphics resized = new BGraphics(nx, ny); // new width, height
resized.format = RGBA; // needed due to a bug
resized.image( imageset[i], 0, 0, nx, ny ); //draw the image scaled
imageset[i] = new BImage(resized); //put it back into the array
}
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/F
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cc
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Re: BImage resize
« Reply #2 on: Nov 20th, 2004, 11:59pm » |
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This doesn't seem to work for me. I get the following error when I try the code above: "No applicable overload was found for a constructor of type "BImage". Perhaps you wanted the overloaded version 'BImage(java.awt.Image $1);' instead?".
Seems like a 'type cast' issue, but I don't know how I would do this in Processing. Perhaps I am missing something.
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fjen
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Re: BImage resize
« Reply #3 on: Nov 21st, 2004, 3:50pm » |
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right. i thought there was a constructor using BImage.
then just do:
imageset[i] = ( (BImage)resized ).copy();
btw: if all you images are same size you might consider moving the first two lines out of (before) the for-loop ...
/F
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TomC
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Re: BImage resize
« Reply #4 on: Nov 21st, 2004, 5:34pm » |
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I don't think you need to cast a BGraphics to BImage in order to call copy(), because the return type is what matters and it returns a BImage.
Another way to do this is with replicate(). The following code loads an image and makes a 40x30 thumbnail of it.
Code:
BImage source = loadImage("whatever.jpg");
BImage thumb = new BImage(40,30);
thumb.replicate(source,0,0,source.width-1,source.height-1,0,0,thumb.widt h-1,thumb.height-1);
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(The '-1' bits are because replicate asks for the coordinates of the area to copy, not the width and height... I think this might/should change in the future to match the semantics of image, rect, etc. because it's not very intuitive - I should probably check with toxi that I got it right.)
On update: not sure about those -1's. The documentation suggests one thing, and the actual behaviour suggests another... anyone know the source and care to clarify?
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| « Last Edit: Nov 21st, 2004, 5:39pm by TomC » |
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fjen
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Re: BImage resize
« Reply #5 on: Nov 21st, 2004, 6:03pm » |
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yeah, i know about the return type. just wanted to make sure that in case BGraphics overloads copy (which it doesn't) you still get a BImage ...
i don't know about replicate() in BImage ... i think it will be replaced in megabucket.
/F
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| « Last Edit: Nov 21st, 2004, 6:04pm by fjen » |
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TomC
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Re: BImage resize
« Reply #6 on: Nov 21st, 2004, 6:58pm » |
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on Nov 21st, 2004, 6:03pm, fjen wrote:yeah, i know about the return type. just wanted to make sure that in case BGraphics overloads copy (which it doesn't) you still get a BImage ...
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I see. I think you have a couple of things mixed up then:
Firstly, because BGraphics extends BImage it couldn't have a function called copy which had a different return type to copy in BImage.
Secondly, I don't know for sure but I don't think there's any way to use BImage's definition of copy from a BGraphics instance. I don't think the way you did it would alter the behaviour. Try the following:
Code:
class MyImage {
public MyImage copy() {
println("MyImage.copy()");
return new MyImage();
}
}
class MyGraphics extends MyImage {
public MyImage copy() {
println("MyGraphics.copy()");
return new MyGraphics();
}
}
void setup() {
size(100,100);
}
void draw() {
MyImage img = new MyImage();
MyImage temp = img.copy();
MyGraphics gfx = new MyGraphics();
temp = gfx.copy();
temp = ((MyImage)gfx).copy();
}
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You should get:
Code:
MyImage.copy()
MyGraphics.copy()
MyGraphics.copy()
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fjen
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Re: BImage resize
« Reply #7 on: Nov 21st, 2004, 7:29pm » |
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i see ... and it makes sense.
i guess this leaves room to do some refresh on my fuzzy java-knowledge today ...
thanks!
/F
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