func (a XY) Cartesian() (x, y, z float32) {
	return a.X, a.Y, 0
}
Cartesian returns the two coordinates; z is always 0.
package coord
import (
	"math"
	"github.com/cozely/cozely/x/math32"
)
type XY struct {
	X float32
	Y float32
}