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package engine
// Comp is a Derived Quantity pointing to a single component of vector Quantity
import (
"fmt"
"github.com/mumax/3/cuda"
"github.com/mumax/3/data"
"github.com/mumax/3/util"
)
type component struct {
parent Quantity
comp int
}
// Comp returns vector component c of the parent Quantity
func Comp(parent Quantity, c int) ScalarField {
util.Argument(c >= 0 && c < parent.NComp())
return AsScalarField(&component{parent, c})
}
func (q *component) NComp() int { return 1 }
func (q *component) Name() string { return fmt.Sprint(NameOf(q.parent), "_", compname[q.comp]) }
func (q *component) Unit() string { return UnitOf(q.parent) }
func (q *component) Mesh() *data.Mesh { return MeshOf(q.parent) }
func (q *component) Slice() (*data.Slice, bool) {
p := q.parent
src := ValueOf(p)
defer cuda.Recycle(src)
c := cuda.Buffer(1, src.Size())
return c, true
}
func (q *component) EvalTo(dst *data.Slice) {
src := ValueOf(q.parent)
defer cuda.Recycle(src)
data.Copy(dst, src.Comp(q.comp))
}
var compname = map[int]string{0: "x", 1: "y", 2: "z"}
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