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Last change
on this file since 2730 was 2730, checked in by Takeshi Nakazato, 12 years ago |
New Development: No
JIRA Issue: Yes CAS-4770
Ready for Test: Yes
Interface Changes: No
What Interface Changed: Please list interface changes
Test Programs: List test programs
Put in Release Notes: Yes/No
Module(s): Module Names change impacts.
Description: Describe your changes here...
Rewrite implementations for locator and interpolator.
Documentation (doxygen format) is added to header files.
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File size:
1.3 KB
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| [2727] | 1 | //
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| 2 | // C++ Implementation: BufferedLinearInterpolator1D
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| 3 | //
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| 4 | // Description:
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| 5 | //
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| 6 | //
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| 7 | // Author: Takeshi Nakazato <takeshi.nakazato@nao.ac.jp>, (C) 2012
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| 8 | //
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| 9 | // Copyright: See COPYING file that comes with this distribution
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| 10 | //
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| 11 | //
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| 12 | #include <assert.h>
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| 13 |
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| 14 | #include "BufferedLinearInterpolator1D.h"
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| 15 |
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| 16 | namespace asap {
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| 17 |
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| 18 | BufferedLinearInterpolator1D::BufferedLinearInterpolator1D()
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| 19 | : Interpolator1D(),
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| 20 | reusable_(false)
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| 21 | {}
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| 22 |
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| 23 | BufferedLinearInterpolator1D::~BufferedLinearInterpolator1D()
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| 24 | {}
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| 25 |
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| [2730] | 26 | void BufferedLinearInterpolator1D::setData(double *x, float *y, unsigned int n)
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| 27 | {
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| 28 | Interpolator1D::setData(x, y, n);
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| 29 | reusable_ = false;
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| 30 | }
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| 31 |
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| [2727] | 32 | void BufferedLinearInterpolator1D::setX(double *x, unsigned int n)
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| 33 | {
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| 34 | Interpolator1D::setX(x, n);
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| 35 | reusable_ = false;
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| 36 | }
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| 37 |
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| 38 | float BufferedLinearInterpolator1D::interpolate(double x)
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| 39 | {
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| 40 | assert(isready());
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| 41 | if (n_ == 1)
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| 42 | return y_[0];
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| 43 |
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| 44 | unsigned int i;
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| 45 | bool b = (reusable_ && x == xold_);
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| 46 | if (b) {
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| 47 | i = prev_;
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| 48 | }
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| 49 | else {
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| 50 | i = locator_->locate(x);
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| 51 | prev_ = i;
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| 52 | xold_ = x;
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| 53 | }
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| 54 |
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| 55 | // do not perform extrapolation
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| 56 | if (i == 0) {
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| 57 | return y_[i];
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| 58 | }
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| 59 | else if (i == n_) {
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| 60 | return y_[i-1];
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| 61 | }
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| 62 |
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| 63 | // linear interpolation
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| 64 | if (!b)
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| 65 | factor_ = (x - x_[i-1]) / (x_[i] - x_[i-1]);
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| 66 | float y = y_[i-1] + (y_[i] - y_[i-1]) * factor_;
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| 67 | reusable_ = true;
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| 68 | return y;
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| 69 | }
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| 70 |
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| 71 | }
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