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You re now ready to define the function responsible for drawing in your window. You cannot assume anything about the current state of the window; thus, the paint function always draws the visible primitives1 depending on the state of menu entries. let paint (g:Graphics) = if (menuBezier.Checked) then g.DrawLine(Pens.Red, cpt.[0], cpt.[1]) g.DrawLine(Pens.Red, cpt.[2], cpt.[3]) g.DrawBeziers(Pens.Black, cpt) if (menuCanonical.Checked) then g.DrawCurve(Pens.Blue, cpt, float32 scrollbar.Value) if (menuControlPoints.Checked) then for i = 0 to cpt.Length - 1 do drawPoint g cpt.[i] Figure 11-3 shows the result of the drawing all the elements. The B zier curve, widely used in image-processing and vector applications, uses the four control points to define the start and end points of the curve and the two segments tangent to the curve at its ends. The cubic parametric curve is calculated from these points and produces the red and black lines shown in Figure 11-3. The canonical spline, on the other hand, is a curve that traverses all the control points, and the tension parameter controls how curvy the curve is. You now want to allow users to move control points simply by dragging and dropping. We re interested in mouse events, in particular when the mouse button is pressed, when it moves, and when the button is released. Thanks to the well-defined model for rendering the application, you can simply update the state of your variables and ask the graphical system to issue a paint message that will cause the window to receive a paint message and update the current frame.

The BrokenRulesCollection class is used by ValidationRules to maintain the list of currently broken rules. Each broken rule is represented by a BrokenRule object. The collection inherits from Csla. Core.ReadOnlyBindingList and so is a read-only collection: [Serializable()] public class BrokenRulesCollection : Core.ReadOnlyBindingList<BrokenRule> { internal BrokenRulesCollection() { // limit creation to this assembly } } The collection also includes an internal constructor, thus ensuring that an instance of the object can only be created from within the CSLA .NET framework. Also, though the collection is read-only, it does provide some internal methods to allow ValidationRules to add and remove items. These methods are used in the CheckRules() methods to ensure that broken rules are only in the list when appropriate: internal void Add(ValidationRules.RuleMethod rule) { Remove(rule); IsReadOnly = false; Add(new BrokenRule(rule)); IsReadOnly = true; } internal void Remove(ValidationRules.RuleMethod rule) { // we loop through using a numeric counter because // removing items within a foreach isn't reliable IsReadOnly = false; for (int index = 0; index < Count; index++) { if (this[index].RuleName == rule.RuleName)

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{ RemoveAt(index); break; } } IsReadOnly = true; } The Add() method is pretty straightforward. To avoid possible duplicate object issues, it first ensures that the broken rule isn t already in the list by calling the Remove() method. Then it changes the collection to be read-write, adds the rule to the collection, and sets the collection back to be read-only. While it could just see if the collection contains the broken rule, removing and re-adding the rule is better, because it ensures that the human-readable description for the rule is current. The rule method could have changed the description over time. The Remove() method is a bit more complex. It has to scan through the collection to find a rule with the same rule name. Notice that no exception is thrown if the item isn t in the collection. If it isn t there, that s fine then there s just no need to remove it. There are two other methods in BrokenRulesCollection worth mentioning. Both provide information about the contents of the collection. The GetFirstBrokenRule() method scans the list and returns the first broken rule (if any) for a specified property. You may recall that this method was used in Csla.Core.BusinessBase to implement the IDataErrorInfo interface. The second is an overridden ToString() method that concatenates the human-readable descriptions of all broken rules into a single string value. This too is used in the IDataErrorInfo implementation to return all the errors for the entire object.

1. If primitives fall out of the area allowed for drawing, they will be clipped, in part or in entirety.

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