source: branches/HeuristicLab.Problems.GrammaticalOptimization/DynamicDataDisplay/ViewportConstraints/MaximalSizeConstraint.cs @ 12503

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;

namespace Microsoft.Research.DynamicDataDisplay.ViewportConstraints
{
  /// <summary>
  /// Represents a constraint, which limits the maximal size of <see cref="Viewport"/>'s Visible property.
  /// </summary>
  public class MaximalSizeConstraint : ViewportConstraint
  {
    /// <summary>
    /// Initializes a new instance of the <see cref="MaximalSizeConstraint"/> class.
    /// </summary>
    public MaximalSizeConstraint() { }

    /// <summary>
    /// Initializes a new instance of the <see cref="MaximalSizeConstraint"/> class with the given maximal size of Viewport's Visible.
    /// </summary>
    /// <param name="maxSize">Maximal size of Viewport's Visible.</param>
    public MaximalSizeConstraint(double maxSize)
    {
      MaxSize = maxSize;
    }

    private double maxSize = 1000;
    /// <summary>
    /// Gets or sets the maximal size of Viewport's Visible.
    /// The default value is 1000.0.
    /// </summary>
    /// <value>The size of the max.</value>
    public double MaxSize
    {
      get { return maxSize; }
      set
      {
        if (maxSize != value)
        {
          maxSize = value;
          RaiseChanged();
        }
      }
    }

    /// <summary>
    /// Applies the specified old data rect.
    /// </summary>
    /// <param name="oldDataRect">The old data rect.</param>
    /// <param name="newDataRect">The new data rect.</param>
    /// <param name="viewport">The viewport.</param>
    /// <returns></returns>
    public override DataRect Apply(DataRect oldDataRect, DataRect newDataRect, Viewport2D viewport)
    {
      bool decreasing = newDataRect.Width < oldDataRect.Width || newDataRect.Height < oldDataRect.Height;
      if (!decreasing && (newDataRect.Width > maxSize || newDataRect.Height > maxSize))
        return oldDataRect;

      return newDataRect;
    }
  }
}