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PO
 

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    <p>I still think the calculations themselves are not relevant, it just seems like some experiment (especially with the screens from the video in mind). </p> <p>However, I'll try and explain what I think the code does (without more information it's not that easy):</p> <p>First, he loops over all screen pixels and calculates a color for those.</p> <ul> <li><code>double ydepth = y - height / 2;</code> would cause the depth to be negative for all pixels at the top half of the screen</li> <li><code>double xdepth = x - width / 2;</code> would cause the depth to be negative for the left half of the screen</li> </ul> <p>This seems to be done in order to center the generated pattern within the screen. There are those 2 black segments (lower left and upper right), but the code you posted doesn't explain what is done here.</p> <p><code>int xx = (int) (xdepth) &amp; 5;</code> would set the value of <code>xx</code> to 0 (i.e. black) whenever neither bits 1 nor 3 (5 is binary 101) are set. Thus <code>xx</code> can only have the values 0, 1, 4 and 5 which would cause those black streaks.</p> <p><code>xx * 128</code> would boost the value to 0, 128, 512 and 640, which would result in a different depending on how <code>pixels</code> is used. (If <code>pixels</code> represents colors in ARGB format, 0 would be black, 128 would be dark blue, 512 would be dark green (almost black) and 640 would also be dark blue with some slight green component.</p> <p>That being said, I just skimmed over the code and did some example calculations where necessary. For more information just follow that trail.</p>
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    1. COThanks man.. I kind of understand it better now. as i look at the code and play with it a bit i am starting to see the picture about how it works. thanks
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