GRADIENTDLGPARAMS

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typedef struct _GRADIENTDLGPARAMS
{
   L_UINT uStructSize;
   pBITMAPHANDLE pBitmap;
   L_UINT uStyle;
   COLORREF crStart;
   COLORREF crEnd;
   L_UINT uSteps;
   L_UINT32 uDlgFlags;
   LTCOMMDLGHELPCB pfnHelpCallback;
   L_VOID *pHelpCallBackUserData;
} GRADIENTDLGPARAMS,* LPGRADIENTDLGPARAMS;

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

Member	Description
uStructSize	Size of this structure, in bytes. Use the sizeof operator to calculate this value.
pBitmap	Pointer to the bitmap handle that references the bitmap used for preview or processing.
uStyle	The gradient style. For a list of possible values, refer to Effect Gradient Styles.
crStart	The starting color of the gradient. You can specify a COLORREF value, such as the return value of the Windows RGB macro, or you can use the PALETTEINDEX macro to specify a palette color.
crEnd	The ending color of the gradient. You can specify a COLORREF value, such as the return value of the Windows RGB macro, or you can use the PALETTEINDEX macro to specify a palette color.
uSteps	The number of steps in the gradient.
uDlgFlags	User interface flags for this dialog, which determines the layout and action of the dialog. Possible values are:
	Value	Meaning
	DLG_GRADIENT_SHOW_CONTEXTHELP	[0x00000001] dialog should contain a context sensitive help icon.
	DLG_GRADIENT_SHOW_PREVIEW	[0x00000002] show a preview of the image in the dialog. The pBitmap member of this structure should contain a valid bitmap.
	DLG_GRADIENT_AUTOPREVIEW	[0x00000004] auto preview when options change
	DLG_GRADIENT_STARTCOLOR	[0x00000008] start color is an option
	DLG_GRADIENT_ENDCOLOR	[0x00000010] end color is an option
	DLG_GRADIENT_STEPS	[0x00000020] gradient steps is an option
	DLG_GRADIENT_NO_TREEVIEW	[0x00000040] DO NOT use TreeView
	DLG_GRADIENT_CLASS_LINEAR	[0x00000080] linear gradients are an option
	DLG_GRADIENT_CLASS_ANGULAR	[0x00000100] angular gradients are an option
	DLG_GRADIENT_CLASS_RECTANGULAR	[0x00000200] rectangular gradients are an option
	DLG_GRADIENT_CLASS_ELLIPTICAL	[0x00000400] elliptical gradients are an option
	DLG_GRADIENT_CLASS_CONICAL	[0x00000800] conical gradients are an option
pfnHelpCallback	Pointer to an optional help callback function. If you do not wish to provide help to this dialog, use NULL as the value of this parameter. To provide help to this dialog, use the function pointer as the value of this parameter. The callback function must adhere to the prototype described in LTCOMMDLGHELPCB.
pHelpCallBackUserData	Void pointer that you can use to pass one or more additional parameters that the callback function needs. To use this feature, assign a value to a variable or create a structure that contains as many fields as you need. Then, in this parameter, pass the address of the variable or structure, casting it to L_VOID *. The callback function, which receives the address in its own pHelpCallBackUserData parameter, can cast it to a pointer of the appropriate data type to access your variable or structure. If the additional parameters are not needed, you can pass NULL in this parameter.