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MapWindow 6.0: An Extensible Architecture for Cartographic Symbology

FOSS4G Conference October, 2009. MapWindow 6.0: An Extensible Architecture for Cartographic Symbology. Ted Dunsford. Ted Dunsford Graduate Research Assistant Idaho State University with Dr. Dan Ames, in collaboration with U.S. Environmental Protection Agency,

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MapWindow 6.0: An Extensible Architecture for Cartographic Symbology

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  1. FOSS4G Conference October, 2009 MapWindow 6.0: An Extensible Architecture for Cartographic Symbology • Ted Dunsford

  2. Ted Dunsford Graduate Research Assistant Idaho State University with Dr. Dan Ames, in collaboration with U.S. Environmental Protection Agency, AQUA TERRA Consultants, and CUAHSI

  3. Overview • MapWindow 6.0 & Component Architecture • Extensibility & Interfaces • Extensible Symbology Architecture

  4. MapWindow 4 ActiveX Control 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.

  5. MapWindow 4 Application • Strictly 2D • Requires ActiveX • Supports one plug-in interface that controls the entire application. • Fast C++ drawing but limited symbology • Slow data manipulation

  6. The Curent Project: • MapWindow 4.x • Our Legacy Open Source project wrapping an ActiveX control • MapWindow 5.x • Our Dot Net Web Mapping Tools • Community Code • No ActiveX control dependencies • Modular • Extendable • Versatile

  7. Components Component Based Architecture Lets you…

  8. Drag and Drop a New GIS! • Tool Strip • Pre-Loaded Buttons • Status Strip • Handles Progress Messages

  9. Drag and Drop a Map

  10. Drag’n Drop a Legend

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

  12. Even Plug-in Management!

  13. Interfaces Original Object Interface Color Width Height

  14. Extensibility Interface Unknown Object Color ??? Width Height

  15. MapWindow Defines Interfaces MapWindow Interface Plug-in Color Width Height Plug-ins provide new code that satisfies standardized interfaces.

  16. Interfaces Define the Plug-in MapWindow Application MapWindow Interfaces www.ioffer.com MapWindow searches for classes that implement specific interfaces by using System.Reflection

  17. Managers Wrangle Plugins • Plugins do the work: • Loading data • Performing a process • Handle events • Managers decide which provider gets used. deutsch.istockphoto.com

  18. Feature Symbology Feature Layer Symbolizer (default) Symbology Feature Scheme Categories Feature Category Collection [0] Feature Category 0 Symbolizer [1] Feature Category 1 Symbolizer FeatureSet

  19. Point Symbolizers GetColor() Point Category Point Symbolizer Symbols Filter Expression [1] Character Symbol List<ISymbol> [0] Your Symbol

  20. Symbolizers Stack Symbols

  21. Built In Point Symbols

  22. Simple Point Symbols • Simple Symbols: • Color • Shape • Symbols • Size • Offset • Angle • Outline Symbols • Outline Color • Outline Width • Use Outline

  23. Character Point Symbols • Character Symbols: • Character • FontFamilyName • Color • Style • Symbols • Size • Offset • Angle * True Type fonts are scalable vectors, and many are symbolic.

  24. Picture Point Symbols • Picture Symbols: • Image • ImageFilename • Opacity • Symbols • Size • Offset • Angle • Outline Symbols • Outline Color • Outline Width • Use Outline

  25. Multiple Layers in Action

  26. Point Categories • Symbolizer • Selection Symbolizer • Filter Expression

  27. Filter Expressions PointCategory smallSize = newPointCategory(Color.Blue, PointShapes.Rectangle, 4); smallSize.FilterExpression = "[Area] < .01"; smallSize.LegendText = "Small Cities"; PointCategory largeSize = newPointCategory(Color.Yellow, PointShapes.Star, 16); largeSize.FilterExpression = "[Area] >= .01"; largeSize.LegendText = "Large Cities";

  28. Multiple Categories

  29. Make Your Own ISymbol • Step 1: Implement ISymbol • public class Symbol :ISymbol • Step 2: Draw • public void Draw(Graphics g, doublescale) • { • Rectanglebounds = new Rectangle(-5, -5, 10, 10); • g.DrawEllipse(Pens.Black, bounds); • }

  30. UI for Custom Symbols • Property Grid • Built in to .Net • Customizable Editors • Adapts to Any Object • Reflection • Use System.Reflection • More Design Control • Much more effort

  31. Save and Load Custom Symbols using MapWindow.Serialization; Add Reference Add an Attribute Tag [Serialize("PointShapes")] publicPointShapes PointShape { get { return _pointShape; } set { _pointShape = value; } }

  32. XML File Saves Object Definition • Object Types Cached At The Top • Types are re-used <item key="16" value="MapWindow.Drawing.SimpleSymbol, MapWindow, Version=6.0.0.0, Culture=neutral, PublicKeyToken=ca60e6823c3a6ee5" /> <item type="16"> <member name="XmlColor" type="17" value="#227A9A" /> <member name="Opacity" type="18" value="1" /> <member name="PointShapes" type="19" value="Star" />

  33. Upcomming Goals • File-based Vector Formats • OGR Feature Providers • Large scale raster & image handling

  34. Thanks to the U.S. Environmental Protection Agency AQUA TERRA Consultants CUAHSI HIS And Dr. Daniel P. Ames Thanks!

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