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#ifndef lint |
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static const char RCSid[] = "$Id$"; |
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static const char RCSid[] = "$Id$"; |
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#endif |
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/* |
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* Compute 4-byte direction code (assume this fits into int) |
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* Compute a 4-byte direction code (int4 type defined in standard.h). |
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* |
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* Mean accuracy is 0.0022 degrees, with a maximum error of 0.0058 degrees. |
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*/ |
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#include "standard.h" |
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for (i = 0; i < 3; i++) |
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if (dv[i] < 0.) { |
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cd[i] = dv[i] * -DCSCALE; |
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cd[i] = (int)(dv[i] * -DCSCALE); |
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dc |= FXNEG<<i; |
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} else |
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cd[i] = dv[i] * DCSCALE; |
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cd[i] = (int)(dv[i] * DCSCALE); |
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if (cd[0] <= cd[1]) { |
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dc |= F1X | cd[0] << F1SFT; |
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cm = cd[1]; |
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dc |= F2Z | cd[2] << F2SFT; |
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else |
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dc |= cm << F2SFT; |
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if (!dc) /* don't generate 0 code */ |
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dc = F1X; |
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return(dc); |
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} |
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