ID2D1Geometry.ComputePointAtLength

Undocumented in source but is binding to Windows. You might be able to learn more by searching the web for its name.

HRESULT ComputePointAtLength(float length, D2D1_MATRIX_3X2_F* worldTransform, D2D1_POINT_2F* point, D2D1_POINT_2F* unitTangentVector)
interface ID2D1Geometry
extern (Windows)
HRESULT
ComputePointAtLength
(
float length
,
const D2D1_MATRIX_3X2_F* worldTransform
,
D2D1_POINT_2F* point
,
D2D1_POINT_2F* unitTangentVector
)
HRESULT ComputePointAtLength(float length, D2D1_MATRIX_3X2_F* worldTransform, float flatteningTolerance, D2D1_POINT_2F* point, D2D1_POINT_2F* unitTangentVector)

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aurora directx d2d1 d2d1_0 ID2D1Geometry functions