レーダーチャート

https://gyazo.com/7af49ea0392922de89c4ebf192b9affb

code:radar_chart.cpp

# include <Siv3D.hpp> // OpenSiv3D v0.6.11

Array<double> randomChartValues(const size_t n)

{

return Array<double>{ n, Arg::generator = []() { return Random(); } };

}

void drawRadarChart(const size_t n, const Vec2& posCenter, const double r, const Array<double>& chartValues)

{

const auto ngon = Shape2D::Ngon(n, 200, posCenter).asPolygon();

// 枠

const ColorF lineColor{ 1.0, 0.5 };

ngon.drawFrame(2.0, lineColor);

for (const auto& v : ngon.vertices())

{

Line{ posCenter, v }.draw(1.0, lineColor);

}

// 値をプロット

Array<Vec2> points;

{

}

// プロットした点を繋いで描画

Polygon{ points }.draw(ColorF{ Palette::Lime, 0.5 });

}

void Main()

{

Scene::SetBackground(ColorF{ 0.1 });

double nInput = 6;

size_t n = static_cast<size_t>(nInput);

Array<double> chartValues = randomChartValues(n);

while (System::Update())

{

SimpleGUI::Slider(U"N = {}"_fmt(static_cast<size_t>(nInput)), nInput, 3.0, 8.0, Vec2{ 16, 16 });

if (const size_t nNew = static_cast<size_t>(nInput); nNew != n)

{

n = nNew;

chartValues = randomChartValues(n);

}

drawRadarChart(n, Scene::CenterF(), 200, chartValues);

}

}