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Controlling Color, Line Style, and other Shape Properties

Some shape properties such as color can be 'exposed’ – that is, linked to a domain property of the shape. Others have to be controlled directly.

Some shape properties such as color can be linked to the value of a domain property.

In the DSL Definition, select a shape, connector or diagram class. On its context menu, choose Add Exposed, and then choose the property you want, such as Fill Color.

The shape now has a domain property that you can set in program code or as a user.

Typically you want to make the exposed property dependent on another property. For example, you might want a shape to turn red whenever a particular domain property is less than zero. To make this dependency, create a rule. For example:

using System;
using System.Collections.Generic;
using System.Linq;
using Microsoft.VisualStudio.Modeling;
using Microsoft.VisualStudio.Modeling.Diagrams;
namespace ExampleNamespace
 // Attribute associates the rule with class:
 [RuleOn(typeof(CarShape), FireTime = TimeToFire.TopLevelCommit)]
 // The rule is a class derived from one of the abstract rules:
 class CarShapeAddRule : AddRule
 // Override the abstract method:
 public override void ElementAdded(ElementAddedEventArgs e)
 CarShape shape = e.ModelElement as CarShape;
 Store store = shape.Store;
 // Ignore this call if we're currently loading a model:
 if (store.TransactionManager.CurrentTransaction.IsSerializing) 
 Car car = shape.ModelElement as Car;
 // Code here propagates change as required - for example:
 shape.FillColor = car.Somebool ? System.Drawing.Color.Red : System.Drawing.Color.Green; 
 // The rule must be registered:
 public partial class ExampleDomainModel
 protected override Type[] GetCustomDomainModelTypes()
  List<Type> types = new List<Type>(base.GetCustomDomainModelTypes());
  // If you add more rules, list them here. 
  return types.ToArray();
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