selection.bas

来自「ao开发指南的东西 源码 希望大家好好学习ao」· BAS 代码 · 共 25 行

Attribute VB_Name = "Utilities"
Option Explicit
' Variables used by the Error handler function - DO NOT REMOVE
Const c_ModuleFileName = "Utilities.bas"

Public Declare Function GetKeyState% Lib "user32" (ByVal nKey%)

Public Function ConvertPixelsToMapUnits(pActiveView As esriCore.IActiveView, pixelUnits As Double) As Double
  On Error GoTo ErrorHandler

  Dim realWorldDisplayExtent As Double
  Dim pixelExtent As Integer
  Dim sizeOfOnePixel As Double
  
  pixelExtent = pActiveView.ScreenDisplay.DisplayTransformation.DeviceFrame.Right - pActiveView.ScreenDisplay.DisplayTransformation.DeviceFrame.Left
  realWorldDisplayExtent = pActiveView.ScreenDisplay.DisplayTransformation.VisibleBounds.Width
  sizeOfOnePixel = realWorldDisplayExtent / pixelExtent
  ConvertPixelsToMapUnits = pixelUnits * sizeOfOnePixel

  Exit Function
ErrorHandler:
  HandleError True, "ConvertPixelsToMapUnits " & c_ModuleFileName & " " & GetErrorLineNumberString(Erl), Err.Number, Err.Source, Err.Description, 1
End Function