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ID2D1Geometry::ComputeLength methods
Overload list
Method  Description 

ComputeLength(D2D1_MATRIX_3X2_F&,FLOAT*) 
Calculates the length of the geometry as though each segment were unrolled into a line. 
ComputeLength(D2D1_MATRIX_3X2_F*,FLOAT*) 
Calculates the length of the geometry as though each segment were unrolled into a line. 
ComputeLength(D2D1_MATRIX_3X2_F&,FLOAT,FLOAT*) 
Calculates the length of the geometry as though each segment were unrolled into a line. 
ComputeLength(D2D1_MATRIX_3X2_F*,FLOAT,FLOAT*) 
Calculates the length of the geometry as though each segment were unrolled into a line. 
Examples
The following code shows how to use ComputeLength to compute the length of a specified path geometry.
float length = 0; hr = m_pPathGeometry>ComputeLength( NULL, //no transform &length ); if (SUCCEEDED(hr)) { m_Animation.SetStart(0); //start at beginning of path m_Animation.SetEnd(length); //length at end of path m_Animation.SetDuration(5.0f); //seconds ZeroMemory(&m_DwmTimingInfo, sizeof(m_DwmTimingInfo)); m_DwmTimingInfo.cbSize = sizeof(m_DwmTimingInfo); // Get the composition refresh rate. If the DWM isn't running, // get the refresh rate from GDI  probably going to be 60Hz if (FAILED(DwmGetCompositionTimingInfo(NULL, &m_DwmTimingInfo))) { HDC hdc = GetDC(m_hwnd); m_DwmTimingInfo.rateCompose.uiDenominator = 1; m_DwmTimingInfo.rateCompose.uiNumerator = GetDeviceCaps(hdc, VREFRESH); ReleaseDC(m_hwnd, hdc); } ShowWindow(m_hwnd, SW_SHOWNORMAL); UpdateWindow(m_hwnd); }
For the complete example, see the Simple Path Animation Sample.
Requirements
Library 


DLL 

See also
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