マウスに吸着する物体
#OpenSiv3D #Cursor
https://gyazo.com/ccebd99ca792193a5fb9c2e6fa0dcbbb
code:cpp
#include <Siv3D.hpp> // OpenSiv3D v0.6.11
// マウスに吸着する物体
class Item
{
Vec2 m_pos;
public:
Item(const Vec2 position) : m_pos(position)
{
}
void update()
{
if (distanceFromCursor() < 100)
{
m_pos += (Cursor::PosF() - m_pos) * 8.0 * Scene::DeltaTime();
}
Circle(Arg::center = m_pos, 5.0).draw(Palette::White);
}
double distanceFromCursor() const
{
return m_pos.distanceFrom(Cursor::PosF());
}
};
void Main()
{
Scene::SetBackground(ColorF(0.2, 0.3, 0.4));
Array<Item> items;
Stopwatch stopwatch(StartImmediately::Yes);
while (System::Update())
{
if (stopwatch.ms() > 50)
{
items.emplace_back(RandomVec2(Scene::Rect()));
stopwatch.restart();
}
for (auto& i : items)
{
i.update();
}
items.remove_if([](const auto& i) { return i.distanceFromCursor() < 30; });
// Cursor
Circle(Arg::center = Cursor::PosF(), 30).drawFrame(1.0, Alpha(128));
Circle(Arg::center = Cursor::PosF(), 100).drawFrame(1.0, Alpha(80));
ClearPrint();
Print << items.size();
}
}