CONTOURFILTERDLGPARAMS

typedef struct _CONTOURFILTERDLGPARAMS 
{ 
   L_UINT uStructSize; 
   pBITMAPHANDLE pBitmap; 
   L_BOOL bZoomToFit; 
   L_INT16 nThreshold; 
   L_INT16 nDeltaDirection; 
   L_INT16 nMaxError; 
   L_INT nOption; 
   L_UINT32 uOptionFlags; 
   L_UINT32 uDlgFlags; 
   LTCOMMDLGHELPCB pfnHelpCallback; 
   L_VOID  *pHelpCallBackUserData; 
} CONTOURFILTERDLGPARAMS,  * LPCONTOURFILTERDLGPARAMS; 

The CONTOURFILTERDLGPARAMS structure provides information used to initialize the dialog box created by the LDialogImageEffect::DoModalContourFilter function. After the user closes the dialog box, this structure is updated with information about the user's selections.

Members

uStructSize

Size of this structure, in bytes. Use the sizeof operator to calculate this value.

pBitmap

Ignored.

bZoomToFit

Flag that indicates the initial zoom level for previewing the image. Possible values are:

Value Meaning
TRUE Set the initial zoom level to "Zoom to fit".
FALSE Set the initial zoom level to "Normal (1:1)".

nThreshold

Threshold of the gradient magnitude. Values below this will be considered as background, and will be set to 0. Values can be from 1 to 254. A lower threshold provides a better quality image.

nDeltaDirection

Maximum angle for the thinning algorithm. Values can be from 1 to 64.

nMaxError

Maximum error for approximation algorithm. Values can be from 0 to 255.

nOption

Flag that controls the resulting image. This value tells the method what process to complete before returning. Possible values are:

Value Meaning
CONTOUR_THIN [0] return after the thinning algorithm
CONTOUR_LINK_BLACKWHITE [1] return after contour linking, using only black and white
CONTOUR_LINK_GRAY [2] return after contour linking, using 256 grayscale
CONTOUR_LINK_COLOR [3] return after contour linking, using colors
CONTOUR_APPROX_COLOR [4] return after line segment approximation, using colors

uOptionFlags

Values that indicate which options will be available in the Contour Option dropdown box. Possible values are:

Value Meaning
DLG_CONTOURFILTER_SHOW_OPTION_THIN [0x00000001] the return after thinning option is available.
DLG_CONTOURFILTER_SHOW_OPTION_LINK_BW [0x00000002] the return after contour linking using only black and white option is available
DLG_CONTOURFILTER_SHOW_OPTION_LINK_GRAY [0x00000004] the return after contour linking using 256 grayscale options is available.
DLG_CONTOURFILTER_SHOW_OPTION_LINK_COLOR [0x00000008] the return after contour linking using colors option is available.
DLG_CONTOURFILTER_SHOW_OPTION_APPROX_COLOR [0x00000010] the return after line segment approximation option is available.
DLG_CONTOURFILTER_SHOW_OPTION_ALL [0x0000001F] ALL the options above available.

uDlgFlags

User interface flags for this dialog, which determine the layout and action of the dialog. Possible values are:

Value Meaning
DLG_CONTOURFILTER_SHOW_CONTEXTHELP [0x00000002] dialog should contain a context sensitive help icon.
DLG_CONTOURFILTER_SHOW_OPTION [0x00000010] show the Contour Option.
DLG_CONTOURFILTER_SHOW_THRESHOLD [0x00000020] show the Threshold option.
DLG_CONTOURFILTER_SHOW_DELTADIRECTION [0x00000040] show the Delta Direction option.
DLG_CONTOURFILTER_SHOW_MAXIMUMERROR [0x00000080] show the Maximum Error option.
DLG_CONTOURFILTER_SHOW_APPLY [0x00000800] Show the Apply button in the dialog. The dialog will not apply any effect unless the user presses the Apply button.

pfnHelpCallback

Ignored.

pHelpCallBackUserData

Ignored.

Help Version 20.0.2019.9.19
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