Chapter 11 Navigating Object Model Diagrams

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Chapter 11 Navigating Object Model Diagrams

• Week 6, 2008 Spring

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Getting Layers/Assigning Colors

• Which layer/dataframe change will be made?
• Start from MxDocument class (currently opened
  .mxd file)
• Map class (refers to a data frame)
• FeatureLayer class
• Renderer class (layers legend)
• Symbol class
• Color class

MxDocument is associated with the Map class, but
not with Color class. Associated means that
MxDocuments object has objects in the connected
class. Each map document have data
frames. Symbols class is connected to Color
class, -gt symbols have colors.
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Association (Class to Class)

• Asterisk means multiplicity many maps in one
  map documents (asterisk not in Mxd to
  Application)
• Properties of Classes
• In ILayer, Name returns string and Visible
  returns boolean values
• Some return interfaces, such as FocusMap in
  IMxDocument returns IMap. FocusMap tells you
  which dataframe is active. If you want to hop
  from the MxDocument class to the Map class, you
  get the FocusMap property.
• ThisDocument (predefined object of MxDocument) is
  an object from IDocument (not IMxDocument), but
  FocusMap property is with IMxDocument, so that we
  have to use QI to get to IMxDocument
• See next slide for code

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From Map to Layer

• Dim pMxDoc As IMxDocument
• Set pMxDoc ThisDocument QI
• Dim pMap As IMap
• Set pMap pMxDoc.FocusMap hop from MxDocument
  class to Map class
• To access Layer Layer class is associated with
  Map
• Dim pLayer As ILayer
• Set pLayer pMap.Layer(1)

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Instantiation (class to class)

• Also called Creates relationship
• Where method in class creates object from another
  class.
• Dashed line with an arrow that points to the
  created object.

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Inheritance (class to class)

• When a particular class uses an interface
  (Implement) from a more general class.
• Abstract class (Such as Layer) no objects, once
  interface is implemented, then objects can be
  created, (page 176)
• Solid lines with trianglee.g. Layer with ILayer
  and other connected classes inherit all of
  layers interfaces
• To create a new FeatureLayer and set its Name
  property
• Dim pLayer As ILayer
• Set pLayer New FeatureLayer
• pLayer.Name USA

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Three different Class Types

• Abstract Classes 2-D gray boxes, no object,
  parking spots for common interfaces, you need to
  implement them.
• Classes (regular classes) 3-D white boxes. You
  cant create from the New keyword, need to use
  methods/property of other class to get this.
• Coclasses 3-D gray boxes. You can create object
  with New keyword or from other classs property
  or methods.

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This only updates TOC, not map.
Dim pActiveView As IActiveView Set pActiveView
pMxDoc.ActiveView pActiveView.Refresh
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Color Objects

• Each color is an object, following diagram show
  Color abstract and five coclasses ICmykColor,
  IRgbColor, IHIsColor, IGrayColor, IHsvColor
• Monitor use RGB and printer use CMYK

IRgbColor
To make a sandy yellow pRgbColor.Red
255 pRgbColor.Green 255 pRgbColor.Blue 190
RgbColor
Blue Long Green Long Red Long
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Access Color (p. 189)

• Application ?--
• MxDocument ?--
• PageLayout ?--
• Page ----
• Color on the Display diagram

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RgbColor in Color