MapWindow 6.0: An Extensible MapWindow 6.0: An Extensible Architecture for Cartographic Architecture for Cartographic

SymbologySymbology

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Ted Ted Dunsford Dunsford

FOSS4G ConferenceFOSS4G ConferenceOctober, 2009October, 2009

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Ted DunsfordGraduate Research Assistant Idaho State University

with Dr. Dan Ames,

in collaboration withU.S. Environmental Protection Agency, AQUA TERRA Consultants, and CUAHSI

Overview

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• MapWindow 6.0 & Component Architecture

• Extensibility & Interfaces

• Extensible Symbology Architecture

MapWindow 4 ActiveX Control

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The Map Window 4 project is a windows project that started with the idea of an ActiveX control.

•Very easy to use.

•Drag and drop files to open them.

•Built in zooming an panning.

•Works with a large number of languages.

MapWindow 4 Application

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• Strictly 2D• Requires ActiveX• Supports one

plug-in interface that controls the entire application.

• Fast C++ drawing but limited symbology

• Slow data manipulation

The Curent Project:

• MapWindow 4.x – Our Legacy Open Source project wrapping an ActiveX control

• MapWindow 5.x– Our Dot Net Web Mapping Tools

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• Community Code• No ActiveX control

dependencies• Modular• Extendable• Versatile

Components

Component

Based

Architecture

Lets you…

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Drag and Drop a New GIS!

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•Tool Strip•Pre-Loaded Buttons

•Status Strip•Handles Progress Messages

Drag and Drop a Map

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Drag’n Drop a Legend

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Wire Controls Together

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• Properties Right on the Controls allow them to link together.

Even Plug-in Management!

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Interfaces

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ColorColor

WidthWidth

HeightHeight

Original Object

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ColorColor

WidthWidth

HeightHeight

Unknown Object

???

Extensibility

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MapWindow Defines Interfaces

ColorColor

WidthWidth

HeightHeight

MapWindow

Plug-in Plug-in

Plug-ins provide new code that satisfies standardized interfaces.

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Interfaces Define the Plug-in

MapWindow Interfaces

MapWindow Application

MapWindow searches for classes that implement specific interfaces by using System.Reflection

www.ioffer.com

Managers Wrangle Plugins

• Plugins do the work:– Loading data– Performing a process– Handle events

• Managers decide which provider gets used.

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deutsch.istockphoto.com

Feature Symbology

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Feature LayerFeature Layer

FeatureSetFeatureSet

Feature SchemeFeature Scheme

Symbology

Feature Category Collection

Feature Category Collection

Categories

Symbolizer (default)

Feature Category 0Feature Category 0

Feature Category 1Feature Category 1

[0]

[1]

SymbolizerSymbolizer

SymbolizerSymbolizer

Point Symbolizers

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Point Category Point Category Point SymbolizerPoint Symbolizer

Filter Expression

Filter Expression List<ISymbol>List<ISymbol>

Symbols

Character SymbolCharacter Symbol[1]

[0] Your SymbolYour Symbol

GetColor()

Symbolizers Stack Symbols

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Built In Point Symbols

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Simple Point Symbols

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• Simple Symbols:• Color• Shape

• Symbols• Size• Offset• Angle

• Outline Symbols• Outline Color• Outline Width• Use Outline

Character Point Symbols

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• Character Symbols:• Character• FontFamilyName• Color• Style

• Symbols• Size• Offset• Angle

* True Type fonts are scalable vectors, and many are symbolic.

Picture Point Symbols

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• Picture Symbols:• Image• ImageFilename• Opacity

• Symbols• Size• Offset• Angle

• Outline Symbols• Outline Color• Outline Width• Use Outline

Multiple Layers in Action

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Point Categories

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• Symbolizer• Selection Symbolizer

• Filter Expression

Filter Expressions

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PointCategory smallSize = new PointCategory(Color.Blue, PointShapes.Rectangle, 4);smallSize.FilterExpression = "[Area] < .01";smallSize.LegendText = "Small Cities";

PointCategory largeSize = new PointCategory(Color.Yellow, PointShapes.Star, 16);largeSize.FilterExpression = "[Area] >= .01";largeSize.LegendText = "Large Cities";

Multiple Categories

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Make Your Own ISymbol

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• Step 1: Implement ISymbol

public class Symbol : ISymbol

• Step 2: Draw

public void Draw(Graphics g, double scale){ Rectangle bounds = new Rectangle(-5, -5, 10, 10); g.DrawEllipse(Pens.Black, bounds);}

UI for Custom Symbols

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• Property Grid• Built in to .Net• Customizable Editors• Adapts to Any Object

• Reflection• Use System.Reflection• More Design Control• Much more effort

Save and Load Custom Symbols

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using MapWindow.Serialization;

[Serialize("PointShapes")]public PointShapes PointShape{ get { return _pointShape; } set { _pointShape = value; } }

1. Add Reference

2. Add an Attribute Tag

XML File Saves Object Definition

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<item key="16" value="MapWindow.Drawing.SimpleSymbol, MapWindow, Version=6.0.0.0, Culture=neutral, PublicKeyToken=ca60e6823c3a6ee5" />

• Object Types Cached At The Top

• Types are re-used<item type="16"> <member name="XmlColor" type="17" value="#227A9A" /> <member name="Opacity" type="18" value="1" /> <member name="PointShapes" type="19" value="Star" />

Upcomming Goals

• File-based Vector Formats

• OGR Feature Providers

• Large scale raster & image handling

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Thanks!

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Thanks to the

U.S. Environmental Protection Agency

AQUA TERRA Consultants

CUAHSI HIS

And

Dr. Daniel P. Ames