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Jungfraujoch/common/ResolutionShells.cpp
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v1.0.0-rc.135 (#44)
This is an UNSTABLE release. The release has significant modifications and bug fixes, if things go wrong, it is better to revert to 1.0.0-rc.132.

* Multiple small bug fixes scattered across the whole code base. (detected with GPT-5.4)
* jfjoch_viewer: Improve image render performance

Reviewed-on: #44
Co-authored-by: Filip Leonarski <filip.leonarski@psi.ch>
Co-committed-by: Filip Leonarski <filip.leonarski@psi.ch>
2026-04-16 11:59:59 +02:00

58 lines
2.1 KiB
C++

// SPDX-FileCopyrightText: 2025 Filip Leonarski, Paul Scherrer Institute <filip.leonarski@psi.ch>
// SPDX-License-Identifier: GPL-3.0-only
#include <cmath>
#include <algorithm>
#include "ResolutionShells.h"
#include "JFJochException.h"
ResolutionShells::ResolutionShells(float d_min, float d_max, int32_t nshells)
: d_min(d_min),
d_max(d_max),
one_over_dmin2(1 / (d_min * d_min)),
one_over_dmax2(1 / (d_max * d_max)),
nshells(nshells) {
if (d_min <= 0)
throw JFJochException(JFJochExceptionCategory::InputParameterInvalid, "Resolution must be above zero");
if (d_min >= d_max)
throw JFJochException(JFJochExceptionCategory::InputParameterInvalid, "Reversed resolution bounds");
if (nshells <= 0)
throw JFJochException(JFJochExceptionCategory::InputParameterInvalid,
"Number of shells cannot be zero or negative");
}
std::optional<int32_t> ResolutionShells::GetShell(float d) const {
if (d <= d_min || d > d_max)
return {};
if (d == d_max)
return 0;
const float one_over_d2 = 1 / (d * d);
const float shell_fp = (one_over_d2 - one_over_dmax2) / (one_over_dmin2 - one_over_dmax2) * static_cast<float>(nshells);
return std::clamp<int32_t>(static_cast<int32_t>(shell_fp), 0, nshells - 1);
}
std::vector<float> ResolutionShells::GetShellMeanOneOverResSq() const {
std::vector<float> ret;
const float x = (one_over_dmin2 - one_over_dmax2) / static_cast<float>(nshells);
for (int i = 0; i < nshells; i++) {
const float one_over_d2 = one_over_dmax2 + (static_cast<float>(i) + 0.5f) * x;
ret.push_back(one_over_d2);
}
return ret;
}
std::vector<float> ResolutionShells::GetShellMinRes() const {
std::vector<float> ret;
const float x = (one_over_dmin2 - one_over_dmax2) / static_cast<float>(nshells);
for (int i = 1; i < nshells; i++) {
const float one_over_d2 = one_over_dmax2 + static_cast<float>(i) * x;
const float d = 1 / std::sqrt(one_over_d2);
ret.push_back(d);
}
ret.push_back(d_min);
return ret;
}