Using Programming Languages other than VBA

Sub Example_GradientCentered()
	' This example changes the value of the GradientCentered property.

	Dim hatchObj As AcadHatch
	Dim patternName As String
	Dim PatternType As Long
	Dim bAssociativity As Boolean

	' Define the hatch
	patternName = "CYLINDER"
	PatternType = acPreDefinedGradient '0
	bAssociativity = True

	' Create the associative Hatch object in model space
	Set hatchObj = ThisDrawing.ModelSpace.AddHatch(PatternType, patternName, bAssociativity, acGradientObject)
	Dim col1 As AcadAcCmColor, col2 As AcadAcCmColor
	Set col1 = AcadApplication.GetInterfaceObject("AutoCAD.AcCmColor.16")
	Set col2 = AcadApplication.GetInterfaceObject("AutoCAD.AcCmColor.16")
	Call col1.SetRGB(255, 0, 0)
	Call col2.SetRGB(0, 255, 0)
	hatchObj.GradientColor1 = col1
	hatchObj.GradientColor2 = col2

	' Create the outer boundary for the hatch (a circle)
	Dim outerLoop(0 To 0) As AcadEntity
	Dim center(0 To 2) As Double
	Dim radius As Double
	center(0) = 3: center(1) = 3: center(2) = 0
	radius = 1
	Set outerLoop(0) = ThisDrawing.ModelSpace.AddCircle(center, radius)

	' Append the outerboundary to the hatch object, and display the hatch
	hatchObj.AppendOuterLoop (outerLoop)
	hatchObj.Evaluate
	ThisDrawing.Regen True
	MsgBox "Initial value of GradientCentered is " & hatchObj.GradientCentered
	hatchObj.GradientCentered = False
	MsgBox "New value of GradientCentered is " & hatchObj.GradientCentered
End Sub