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2331fe5e68
Interpolation is needed in more than one place, and I couldn't find a central place where I could borrow a readily available interpolation routine, so I've implemented the first simple interpolation object. More will follow for more complex scenarios.
36 lines
760 B
C++
36 lines
760 B
C++
/*
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* Copyright (c) 2022, Rodrigo Tobar <rtobarc@gmail.com>.
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <LibPDF/Interpolation.h>
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namespace PDF {
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static float slope(float x_min, float x_max, float y_min, float y_max)
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{
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return (y_max - y_min) / (x_max - x_min);
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}
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LinearInterpolation1D::LinearInterpolation1D(float x_min, float x_max, float y_min, float y_max)
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: m_x_min(x_min)
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, m_y_min(y_min)
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, m_slope(slope(x_min, x_max, y_min, y_max))
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{
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}
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float LinearInterpolation1D::interpolate(float x) const
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{
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return m_y_min + ((x - m_x_min) * m_slope);
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}
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void LinearInterpolation1D::interpolate(Span<float> const& x, Span<float> y) const
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{
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for (size_t i = 0; i < x.size(); ++i) {
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y[i] = interpolate(x[i]);
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}
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}
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}
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