Last change
on this file since 1018 was
828,
checked in by vrinside, 16 years ago
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Add interpolation functions for compute values between two values with fraction
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File size:
1.4 KB
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Line | |
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1 | #include <Vector3.h> |
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2 | |
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3 | void evaluate(float fraction, float* key, int count, Vector3* keyValue, Vector3* ret) |
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4 | { |
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5 | int limit = (int) count - 1; |
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6 | if (fraction <= key[0]) |
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7 | { |
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8 | *ret = keyValue[0]; |
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9 | } |
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10 | else if (fraction >= key[limit]) |
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11 | { |
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12 | *ret = keyValue[limit]; |
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13 | } |
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14 | else |
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15 | { |
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16 | int n; |
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17 | for (n = 0;n < limit; n++){ |
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18 | if (fraction >= key[n] && fraction < key[n+1]) break; |
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19 | } |
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20 | |
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21 | if (n >= limit){ |
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22 | *ret = keyValue[limit]; |
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23 | } |
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24 | else { |
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25 | float inter = (fraction - key[n]) / (key[n + 1] - key[n]); |
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26 | ret->set( |
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27 | inter * (keyValue[n + 1].x - keyValue[n].x) + keyValue[n].x, |
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28 | inter * (keyValue[n + 1].y - keyValue[n].y) + keyValue[n].y, |
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29 | inter * (keyValue[n + 1].z - keyValue[n].z) + keyValue[n].z); |
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30 | } |
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31 | } |
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32 | } |
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33 | |
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34 | void evaluate(float fraction, float* key, int count, float* keyValue, float* ret) |
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35 | { |
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36 | int limit = (int) count - 1; |
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37 | if (fraction <= key[0]) |
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38 | { |
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39 | *ret = keyValue[0]; |
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40 | } |
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41 | else if (fraction >= key[limit]) |
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42 | { |
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43 | *ret = keyValue[limit]; |
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44 | } |
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45 | else |
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46 | { |
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47 | int n; |
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48 | for (n = 0;n < limit; n++){ |
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49 | if (fraction >= key[n] && fraction < key[n+1]) break; |
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50 | } |
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51 | |
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52 | if (n >= limit){ |
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53 | *ret = keyValue[limit]; |
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54 | } |
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55 | else { |
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56 | float inter = (fraction - key[n]) / (key[n + 1] - key[n]); |
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57 | *ret = inter * (keyValue[n + 1] - keyValue[n]) + keyValue[n]; |
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58 | } |
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59 | } |
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60 | } |
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