References ▼
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.
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;
Size of this structure, in bytes. Use the sizeof operator to calculate this value.
Ignored.
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)". |
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.
Maximum angle for the thinning algorithm. Values can be from 1 to 64.
Maximum error for approximation algorithm. Values can be from 0 to 255.
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 |
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. |
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. |
Ignored.
Ignored.