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#define SCALE 10000 /* fixed-point math, for sub-pixel motion */
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#define DEF_COUNT 12 /* When planes and count are 0, how many blobs. */
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#define RAND(n) ((long) ((random() & 0x7fffffff) % ((long) (n))))
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#define RANDSIGN() ((random() & 1) ? 1 : -1)