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ID2D1Geometry::ComputeLength(constD2D1_MATRIX_3X2_F*,FLOAT,FLOAT*) method (d2d1.h)

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Calculates the length of the geometry as though each segment were unrolled into a line.

Syntax

HRESULT ComputeLength(
  const D2D1_MATRIX_3X2_F *worldTransform,
  FLOAT                   flatteningTolerance,
  FLOAT                   *length
);

Parameters

worldTransform

Type: [in, optional] const D2D1_MATRIX_3X2_F*

The transform to apply to the geometry before calculating its length, or NULL.

flatteningTolerance

Type: [in] FLOAT

The maximum error allowed when constructing a polygonal approximation of the geometry. No point in the polygonal representation will diverge from the original geometry by more than the flattening tolerance. Smaller values produce more accurate results but cause slower execution.

length

Type: [out] FLOAT*

When this method returns, contains a pointer to the length of the geometry. For closed geometries, the length includes an implicit closing segment. You must allocate storage for this parameter.

Return value

Type: HRESULT

If this method succeeds, it returns S_OK. Otherwise, it returns an HRESULT error code.

Requirements

Requirement Value
Minimum supported client Windows 7, Windows Vista with SP2 and Platform Update for Windows Vista [desktop apps | UWP apps]
Minimum supported server Windows Server 2008 R2, Windows Server 2008 with SP2 and Platform Update for Windows Server 2008 [desktop apps | UWP apps]
Target Platform Windows
Header d2d1.h
Library D2d1.lib
DLL D2d1.dll

See also

ID2D1Geometry