ID2D1Geometry::ComputeArea(constD2D1_MATRIX_3X2_F&,FLOAT,FLOAT) method (d2d1.h)

Computes the area of the geometry after it has been transformed by the specified matrix and flattened using the specified tolerance.


HRESULT ComputeArea(
  const D2D1_MATRIX_3X2_F & worldTransform,
  FLOAT                     flatteningTolerance,
  FLOAT                     *area



Type: [in] const D2D1_MATRIX_3X2_F &

The transform to apply to this geometry before computing its area.


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.


Type: [out] FLOAT*

When this method returns, contains a pointer to the area of the transformed, flattened version of this geometry. You must allocate storage for this parameter.

Return value


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


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