ArcGIS Engine Developer Guide

BUILDING APPLICATIONS WITH ACTIVEX
Try replacing the label with an empty string. You can use the Esc key on the
keyboard at any time during the edit to cancel it.
Navigating around the focus map using the map
navigation tools will change the extent of the
focus map in the PageLayoutControl and cause
the MapControl to update. Navigating around
the page layout with the page layout navigation
tools will change the extent of the page layout
(not the extent of the focus map in the
PageLayoutControl), so the MapControl will
not update.
Drawing shapes on the MapControl
You will now use the MapControl as an overview window and draw the current
extent of the focus map within the PageLayoutControl on its display. As you
navigate around the data within the data frame of the PageLayoutControl, you
will see the MapControl overview window update.
1. Add the following code to the general declarations area of the form.
Option Explicit
Private m_pToolbarMenu As IToolbarMenu
Private m_pEnvelope As IEnvelope ' The envelope drawn on the MapControl
Private m_pFillSymbol As ISimpleFillSymbol ' The symbol used to draw the
' envelope on the MapControl
Private WithEvents m_pTransformEvents As DisplayTransformation
' The PageLayoutControl's focus map events
2. Create a new private subroutine called CreateOverviewSymbol. This is where you
will create the symbol used in the MapControl to represent the extent of the
data in the focus map of the PageLayoutControl. Add the following code to
the subroutine:
Private Sub CreateOverviewSymbol()
' Get the IRgbColor interface.
Dim pColor As IRgbColor
Set pColor = New RgbColor
' Set the color properties.
pColor.RGB = RGB(255, 0, 0)
' Get the ILine symbol interface.
Dim pOutline As ILineSymbol
Set pOutline = New SimpleLineSymbol
292 • ArcGIS Engine Developer Guide