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D2D1ComputeMaximumScaleFactor function (d2d1_2.h)

  • Article

Computes the maximum factor by which a given transform can stretch any vector.

Syntax

FLOAT D2D1ComputeMaximumScaleFactor(
  [in] const D2D1_MATRIX_3X2_F *matrix
);

Parameters

[in] matrix

The input transform matrix.

Return value

The scale factor.

Remarks

Formally, if M is the input matrix, this method will return the maximum value of |V * M| / |V| for all vectors V, where |.| denotes length.

Note  Since this describes how M affects vectors (rather than points), the translation components (_31 and _32) of M are ignored.
 

Requirements

Requirement Value
Minimum supported client Windows 8.1 [desktop apps | UWP apps]
Minimum supported server Windows Server 2012 R2 [desktop apps | UWP apps]
Target Platform Windows
Header d2d1_2.h (include D2d1_1.h)
Library D2d1.lib
DLL D2d1.dll