ShowHalftoneDlg method (LEADDlgColor Control)

C++ Builder example

Delphi 4.0 example

 

Builder Syntax

int ShowHalftoneDlg(TWinControl* AOwnerCtrl);

Delphi Syntax

Function ShowHalftoneDlg (AOwnerCtrl: TWinControl ): L_INT;

Overview

Refer to Using Imaging Common Dialogs.

Remarks

Displays the Halftone dialog box, and gets the options for the HalfTone method.

The layout and action of the dialog depends on the flags set in the DlgFlags property. Possible options are:

Value

Meaning

DLG_HALFTONE_AUTOPROCESS

[$00000001] Process the image on OK. The LEADImage property must be assigned a Main Control containing a valid bitmap before calling this method.

DLG_HALFTONE_SHOW_CONTEXTHELP

[$00000002] Dialog should contain a context sensitive help icon.

DLG_HALFTONE_SHOW_PREVIEW

[$00000004] Show a preview of the image in the dialog. The LEADImage property must be assigned a Main Control containing a valid bitmap before calling this method.

DLG_HALFTONE_SHOW_TOOL_ZOOMLEVEL

[$00000008] Show the "Zoom to fit" and "Zoom Normal" toolbar buttons. The DLG_HALFTONE_SHOW_PREVIEW flag must be set in order to show these buttons.

If you include DLG_HALFTONE_AUTOPROCESS or DLG_HALFTONE_SHOW_PREVIEW in the DlgFlags property, the LEADImage property must be assigned a Main Control containing a valid bitmap before calling this method.

The following properties are associated with this dialog:

Dimension property

Angle property

HalftoneType property

To include a Help button in the dialog, set the ShowHelpButton property to TRUE.

The Halftone dialog can be seen below:

image\Halftone.gif

See Also

Elements:

HalfTone method, Angle property, Dimension property, HalftoneType property, ItemsCount property, ItemDescription property, ItemFileName property, ItemBitmap property, SelectedBitmapList property, ShowHelpButton property, ZoomToFit Property, DlgFlags property, EnableMethodErrors property.

Topics:

Imaging Common Dialogs: Properties, Methods, and Events