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2011-01-06T12:16:00.963
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What do you mean by lazy? An array is not a lazy data type, which means that if you want to use arrays, you need to load all pixels during the initialization. If we were using single-dimensional array, an alternative would be to use <code>seq<_></code> which is lazy (but you can access elements only sequentially). There is nothing like <code>seq<_></code> for multi-dimensional arrays, so you'll need to use something else. Probably the closest option would be to use three-dimensional array of lazy values (<code>Lazy<int>[,,]</code>). This is an array of delayed thunks that access pixels and are evaluated only when you actually read the value at the location. You could initialize it like this: <pre><code>for i=0 to Width for j=0 to Height let point = lazy image.GetPixel(i,j) pixels.[0,i,j] <- lazy point.Value.R pixels.[1,i,j] <- lazy point.Value.G pixels.[2,i,j] <- lazy point.Value.B </code></pre> The snippet creates a lazy value that reads the pixel (<code>point</code>) and then three lazy values to get the individual color components. When accessing color component, the <code>point</code> value is evaluated (by accessing <code>Value</code>). The only difference in the rest of your code is that you'll need to call <code>Value</code> (e.g. <code>pixels.[0,10,10].Value</code> to get the actual color component of the pixel. You could define more complex data structures (such as your own type that supports indexing and is lazy), but I think that array of lazy values should be a good starting point.
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1. POF# lazy pixels reading
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1. USTomas Petricek
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