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Topic: Copying Arrays (Read 251 times) |
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kevin
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Copying Arrays
« on: Aug 29th, 2003, 1:44pm » |
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Hi,
Hopefully, simple thing.
Is it possible to copy an image into an array?
I've crated a 2D array of colors, and tried using system.copyarray*, but I'm not entirely sure on the syntax with regard to 2D arrays. Is it possible?
Thanks,
- Kevin
* http://java.sun.com/docs/books/tutorial/java/data/copyingarrays.html
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fry
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Re: Copying Arrays
« Reply #1 on: Aug 29th, 2003, 5:54pm » |
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in general, you'll actually want to use 1D arrays for images.
but to convert a 2D array to a 1D BImage (image array used by p5).
Code:int theWidth = 320;
int theHeight = 240;
// note that height is first, otherwise can't use arraycopy
int theImage[][] = new int[theHeight][theWidth];
// assuming you stuff something fancy into theImage here
int pixels1D[] = new int[theWidth*theHeight];
for (int row = 0; row < theHeight; row++) {
// copy one row of pixels
System.arraycopy(theImage[row], 0, pixels1D, row*theWidth, theWidth);
}
BImage image = new BImage(pixels1D, theWidth, theHeight, RGB); // or RGBA
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but if your array is array[width][height], then System.arraycopy() won't actually help you, in which case you'd replace the loop with:
Code:
int index = 0;
for (int y = 0; y < theHeight; y++) {
for (int x = 0; x < theWidth; x++) {
pixels1D[index++] = theImage[x][y];
}
} |
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but that's prolly much slower.
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