レーダー

https://scrapbox.io/files/64d4e7ada13577001b7f0cbe.png

code:レーダー.cpp

# include <Siv3D.hpp>

namespace Radar {

void drawBackground(const Circle& circle) {

circle.draw(Palette::Black);

constexpr int32 N = 4;

for (auto i : step(1, N))

{

Circle{ circle.center,i * circle.r / N }.drawFrame(2, ColorF{ 0,0.5,0 });

}

Line{ circle.top(),circle.bottom() }.draw(2, ColorF{ 0,0.5,0 });

Line{ circle.left(),circle.right() }.draw(2, ColorF{ 0,0.5,0 });

}

void drawRadar(const Circle& circle) {

ScopedRenderStates2D blend{ BlendState::Additive };

constexpr int32 N = 20;

for (auto i : step(1, N))

{

const double theta = (i * 2_deg + Scene::Time() * 30_deg);

circle.drawPie(theta, 2_deg, ColorF{ 0,1,0,(double)i / N });

}

}

};

void Main()

{

Circle circle{ Scene::Center(),200 };

while (System::Update())

{

Radar::drawBackground(circle);

Circle{ 460,400,5 }.draw(Palette::Lightgray);

Circle{ 380,250,5 }.draw(Palette::Lightgray);

Radar::drawRadar(circle);

}

}