/Main/src/DynamicDataDisplay/ViewportConstraints/DomainConstraint.cs

 1using System;
 2using System.Collections.Generic;
 3using System.Linq;
 4using System.Text;
 5using System.Windows;
 6using Microsoft.Research.DynamicDataDisplay.Common;
 7
 8namespace Microsoft.Research.DynamicDataDisplay.ViewportConstraints
 9{
10	/// <summary>
11	/// Represents a constraint which returns data rectangle, intersected with specified data domain.
12	/// </summary>
13	public class DomainConstraint : ViewportConstraint
14	{
15		/// <summary>
16		/// Initializes a new instance of the <see cref="DomainConstraint"/> class.
17		/// </summary>
18		public DomainConstraint() { }
19
20		/// <summary>
21		/// Initializes a new instance of the <see cref="DomainConstraint"/> class with given domain property.
22		/// </summary>
23		/// <param name="domain">The domain.</param>
24		public DomainConstraint(DataRect domain)
25		{
26			this.Domain = domain;
27		}
28
29		private DataRect domain = new DataRect(-1, -1, 2, 2);
30		/// <summary>
31		/// Gets or sets the domain.
32		/// </summary>
33		/// <value>The domain.</value>
34		public DataRect Domain
35		{
36			get { return domain; }
37			set
38			{
39				if (domain != value)
40				{
41					domain = value;
42					RaiseChanged();
43				}
44			}
45		}
46
47		/// <summary>
48		/// Applies the specified old data rect.
49		/// </summary>
50		/// <param name="oldDataRect">The old data rect.</param>
51		/// <param name="newDataRect">The new data rect.</param>
52		/// <param name="viewport">The viewport.</param>
53		/// <returns></returns>
54		public override DataRect Apply(DataRect oldDataRect, DataRect newDataRect, Viewport2D viewport)
55		{
56			DataRect res = domain;
57			if (domain.IsEmpty)
58			{
59				res = newDataRect;
60			}
61			else if (newDataRect.IntersectsWith(domain))
62			{
63				res = newDataRect;
64				if (newDataRect.Size == oldDataRect.Size)
65				{
66					if (res.XMin < domain.XMin) res.XMin = domain.XMin;
67					if (res.YMin < domain.YMin) res.YMin = domain.YMin;
68					if (res.XMax > domain.XMax) res.XMin += domain.XMax - res.XMax;
69					if (res.YMax > domain.YMax) res.YMin += domain.YMax - res.YMax;
70				}
71				else
72				{
73					res = DataRect.Intersect(newDataRect, domain);
74				}
75			}
76
77			return res;
78		}
79	}
80}