PathPointX()

Syntax

Result.d = PathPointX(Distance.d)

Returns the X coordinate of the point at the given distance from the start of the current vector drawing path.

Parameters

Distance.d

Specifies the distance from the start of the path. If this parameter is negative or larger than the total path length, the start/endpoint of the path is returned. The full length of the path can be determined with PathLength().

Return value

The X coordinate of the point of the path.

Example

  If OpenWindow(0, 0, 0, 400, 200, "VectorDrawing", #PB_Window_SystemMenu | #PB_Window_ScreenCentered)
    CanvasGadget(0, 0, 0, 400, 200)

    If StartVectorDrawing(CanvasVectorOutput(0))
    
      ; construct path
      MovePathCursor(150, 125)
      AddPathCurve(0, 270, 0, -150, 350, 180)
      
      ; get location & angle of point on the path
      x = PathPointX(200)
      y = PathPointY(200)
      a = PathPointAngle(200)
      
      ; stroke the path
      VectorSourceColor($FF0000FF)
      StrokePath(5)
      
      ; draw a marker at the path point
      AddPathCircle(x, y, 10)
      VectorSourceColor($FFFF0000)
      FillPath()
      
      MovePathCursor(x, y)
      AddPathLine(30*Cos(Radian(a)), 30*Sin(Radian(a)), #PB_Path_Relative)
      StrokePath(5)

      StopVectorDrawing()
    EndIf
    
    Repeat
      Event = WaitWindowEvent()
    Until Event = #PB_Event_CloseWindow
  EndIf

See Also

PathPointY(), PathPointAngle(), PathLength()

Supported OS

All