package main
import (
	"math/rand/v2"
	"github.com/mlange-42/ark/ecs"
)
// Position component
type Position struct {
	X, Y float64
}
// Velocity component
type Velocity struct {
	DX, DY float64
}
func main() {
	// Create a new World
	world := ecs.NewWorld()
	// Create a component mapper
	// Save mappers permanently and re-use them for best performance
	mapper := ecs.NewMap2[Position, Velocity](world)
	// Create entities with components
	for range 1000 {
		_ = mapper.NewEntity(
			&Position{X: rand.Float64() * 100, Y: rand.Float64() * 100},
			&Velocity{DX: rand.NormFloat64(), DY: rand.NormFloat64()},
		)
	}
	// Create a filter
	// Save filters permanently and re-use them for best performance
	filter := ecs.NewFilter2[Position, Velocity](world)
	// Time loop
	for range 5000 {
		// Get a fresh query and iterate it
		query := filter.Query()
		for query.Next() {
			// Component access through the Query
			pos, vel := query.Get()
			// Update component fields
			pos.X += vel.DX
			pos.Y += vel.DY
		}
	}
}