Curve.IsOnCurve method - Developer Area

API Documentation > Corel DESIGNER > 2021.5 > Curve > IVGCurve

Curve.IsOnCurve method

Checks if a point is on curve

Syntax:

Function IsOnCurve(ByVal x As Double, ByVal y As Double, Optional ByVal HotArea As Double = -1) As cdrPositionOfPointOverShape

Parameters:

Name	Type	Description
x	Double	Specifies the horizontal position for the point in the active document, created in relation to the reference point
y	Double	Specifies the vertical position (using the rulers as a reference) for the point in the active document, created in relation to the reference point
HotArea	Double	Specifies a restricted area on the curve in which to evaluate the position of a point.

Remarks:

The IsOnCurve method determines whether a given point is inside or outside of a curve or over its outline.

Examples:

The following VBA examples creates a rectangle in the active document and converts the rectangle to a curve. The ShowOnCurve function is called, coordinates are passed to the function, and a message box displays each point position in relation to the rectangle.

Sub OnCurve()
  Dim s As Shape
  Set s = ActiveLayer.CreateRectangle(0, 0, 2, 2)
  s.ConvertToCurves
  ShowOnCurve 1, 1, s.Curve.IsOnCurve(1, 1)
  ShowOnCurve 1, 0, s.Curve.IsOnCurve(1, 0)
  ShowOnCurve 1, 3, s.Curve.IsOnCurve(1, 3)
End Sub
Private Function ShowOnCurve(x As Double, y As Double, v As cdrPositionOfPointOverShape)
  Dim s As String
  s = "Point (" & x & "," & y & ") is "
  Select Case v
    Case cdrOutsideShape
      s = s & "outside the shape"
    Case cdrOnMarginOfShape
      s = s & "over the outline"
    Case cdrInsideShape
      s = s & "inside the shape"
  End Select
  MsgBox s
End Function

Version Information:

CorelDRAW:	X7.4, X7, X7.6, X8, 2017, 2018, 2019, 2019.2, 2020, 2021, 2020.1, 2021.5, 2022-v24, 2022-v24.1, 2022-v24.2, 2023-v24.3, 2023-v24.5, 2024-v25
Corel DESIGNER:	X7, 2017.1, 20.1, 2019.2, 2020.1, 2021.5, 2022-v24, 2022-v24.1, 2022-v24.2, 2023-v24.3, 2023-v24.5, 2024-v25