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ProEssentials v8 Help

Chapter 4: VCL PEactions Property

 

All ActiveX interfaces include a PEactions property.  This feature allows calling ProEssentials DLL calls via a property based interface when and if it's desired.  The most important thing to remember about PEactions is that it's used to undo the zoom state, and reinitialize the chart after setting properties,

 

PEGraph1.PEactions := gUndoZoom ;

PEGraph1.PEactions := gReinitAndReset;    {Calls PEreinitialize, PEresetimage}

 

Using PEactions to call DLL functions is optional and Delphi has means of calling the ProEssentials DLL directly. If you need to call ProEssentials functions from within Delphi, be sure to add "Pegrpapi" to your uses clause. In Builder, you can include the standard c header file "PEGRPAPI.H" as needed.

 

Related to PEactions are PEnarg1, PEnarg2, and PEstrarg1 which provide for function arguments where needed. For those PEactions that call ProEssentials functions requiring arguments, use:

 

PEnarg1 to set the width argument

PEnarg2 to set the height argument

PEstrarg1 to set the path\filename argument

 

*Note: Be sure to initialize these argument type properties before setting the PEactions property.

 

Below are Delphi VCL Enumerations for the PEactions property. Note that you replace the x prefix with either g(graph), sg(scientific graph), td(3D scientific graph), ps(polar/smith), or pc(pie chart).

 

ePEactions = (

xReinitAndReset,

xReinitialize,

xResetImage,

xInvalidateImage,

xMaximize,

xCustomize,

xExportDialog,

xTextExportDialog,

xPrintDialog,

xColorDialog,

xFontDialog,

xPopupMenu,

xMetaToClip,

xMetaToFile,

xBmpToClip,

xBmpToFile,

xReinitCustoms,

xPrintGraph,

xUndoZoom,

xReset,

xJpegToClip

xJpegToFile

xPngtoClip

xPngtoFile);