Pitney-bowes MapXtreme Manual do Utilizador descarregar pdf (Página 319)

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Chapter 17: Working with Rasters and Grids

Grid Images

MapXtreme v7.1 326 Developer Guide

• Vertical Mapper Continuous Grids

(*.grd, .*grc)

Additional grid formats may be supported on a system if a custom grid handler is installed.

Grid Classes

The main classes for grid images are MapInfo.Raster.GridInfo, GridRead,

GridCreatorFromFeatures, GridInflectionCalculator and HillShadeWrite. GridInfo and GridRead are

like RasterInfo and RasterRead, in this case, provide the ability to get information about a grid file.

Grids are created for a layer of data points using GridCreatorFromFeatures. GridInflectionCalculator

is used to set inflection values and colors. HillShadeWrite allows you to add or alter relief shading to

the grid. Many of the properties of a grid are inherited from RasterInfo, including the image class,

coordinate system, raster control points and minimum bounding rectangle (MBR).

Code Sample: Adding a Grid Image to a Map

Adding a grid image to a map is the same as adding any other layer.

C# example:

Table MyTable = Session.Current.Catalog.OpenTable("MyGrid.tab");

FeatureLayer MyLayer = new FeatureLayer(MyTable);

MyMap.Layers.Add(MyLayer);

VB example:

Dim MyTable As Table = _ Session.Current.Catalog.OpenTable("MyGrid.tab")

Dim MyLayer As FeatureLayer = New FeatureLayer(MyTable)

MyMap.Layers.Add(MyLayer)

Code Sample: Retrieving Data from a Grid Map

This example shows how to open and read information from a grid file.

VB example:

Public Shared Sub MapInfo_Raster_GridRead(ByVal strGridFilename _

As String)

Dim strHillshadeFilename As String = _

MapInfo.Raster.GridRead.DefaultHillshadeFilename(strGridFilename)

Dim session As ISession

session = MapInfo.Engine.Session.Current

Dim gridread As GridRead = New GridRead(strGridFilename,_

strHillshadeFilename)

Console.WriteLine(gridread)

End Sub

1. Can be displayed as either grid or raster. The .TAB file determines whether the image should be drawn

using the grid handler or the raster handler.

2. Not multi-thread safe.

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