LibreVNA/Software/PC_Application/LibreVNA-Test/utiltests.cpp

#include "utiltests.h"

#include <vector>
#include "util.h"

using namespace std;

UtilTests::UtilTests()
{

}

void UtilTests::IdealCircleApproximation()
{
    vector<complex<double>> points;
    // create ideal circle points
    auto center = complex<double>(2.34, 4.12);
    auto radius = 5.0;
    static constexpr int numPoints = 10;
    for(int i=0;i<numPoints;i++) {
        auto angle = 2*M_PI * i / numPoints;
        auto offset = polar(radius, angle);
        points.push_back(center + offset);
    }
    auto circCenter = Util::findCenterOfCircle(points);
    QVERIFY(qFuzzyCompare(center.real(), circCenter.real()));
    QVERIFY(qFuzzyCompare(center.imag(), circCenter.imag()));
}

void UtilTests::IdealArcApproximation()
{
    vector<complex<double>> points;
    // create ideal circle points
    auto center = complex<double>(2.34, 4.12);
    auto radius = 5.0;
    static constexpr int numPoints = 10;
    for(int i=0;i<numPoints;i++) {
        auto angle = 0.1*2*M_PI * i / numPoints;
        auto offset = polar(radius, angle);
        points.push_back(center + offset);
    }
    auto circCenter = Util::findCenterOfCircle(points);
    QVERIFY(qFuzzyCompare(center.real(), circCenter.real()));
    QVERIFY(qFuzzyCompare(center.imag(), circCenter.imag()));
}

void UtilTests::NoisyCircleApproximation()
{
    srand(0);
    vector<complex<double>> points;
    // create ideal circle points
    auto center = complex<double>(2.34, 4.12);
    auto radius = 5.0;
    static constexpr int numPoints = 10;
    for(int i=0;i<numPoints;i++) {
        auto angle = 2*M_PI * i / numPoints;
        auto offset = polar(radius, angle);
        auto noise = polar(0.1*(double)rand() / RAND_MAX, 2*M_PI*(double)rand() / RAND_MAX);
        points.push_back(center + offset + noise);
    }
    auto circCenter = Util::findCenterOfCircle(points);
    constexpr double maxDelta = 0.1;
    QVERIFY(abs(center.real() - circCenter.real()) <= maxDelta);
    QVERIFY(abs(center.imag() - circCenter.imag()) <= maxDelta);
}