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annotate SilverlightGlimpse/SilverFlow.Controls/Controllers/InertiaController.cs @ 63:536498832a79

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Latest version before changing bindings to Listbox
author Steven Hollidge <stevenhollidge@hotmail.com>
date Sun, 22 Apr 2012 13:33:42 +0100
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63
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1 using System;
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2 using System.Collections.Generic;
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3 using System.Windows;
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4 using System.Windows.Media.Animation;
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5 using SilverFlow.Controls.Extensions;
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6 using SilverFlow.Geometry;
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7
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8 namespace SilverFlow.Controls.Controllers
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9 {
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10 /// <summary>
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11 /// Calculates inertial motion of a dragged element.
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12 /// </summary>
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13 public class InertiaController
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14 {
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15 private const double SCREEN_DPI = 96;
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16 private const double INCH = 0.0254;
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17 private const double GRAVITATIONAL_ACCELERATION = 9.81;
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18 private const double COEFFICIENT_OF_SLIDING_FRICTION = 0.015;
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19 private const double MIN_DELTA = 0.001;
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20 private const double DELAY_BEFORE_MOUSE_UP_IN_MILLISECONDS = 100;
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21 private const int MAX_LAST_POINTS_TO_COUNT = 4;
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22
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23 private double pixelsPerMeter = SCREEN_DPI / INCH;
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24
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25 private Queue<Trail> mouseTrails = new Queue<Trail>();
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26
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27 /// <summary>
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28 /// An element starts its motion.
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29 /// </summary>
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30 /// <param name="point">The starting point of the motion.</param>
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31 public void StartMotion(Point point)
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32 {
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33 mouseTrails.Clear();
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34 mouseTrails.Enqueue(new Trail(point, DateTime.Now));
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35 }
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36
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37 /// <summary>
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38 /// Saves the last position of the moved element.
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39 /// </summary>
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40 /// <param name="point">Current position.</param>
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41 public void MoveToPoint(Point point)
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42 {
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43 while (mouseTrails.Count >= MAX_LAST_POINTS_TO_COUNT)
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44 {
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45 // Remove all points except the last ones
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46 mouseTrails.Dequeue();
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47 }
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48
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49 mouseTrails.Enqueue(new Trail(point, DateTime.Now));
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50 }
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51
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52 /// <summary>
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53 /// Gets inertial motion parameters: distance and duration.
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54 /// </summary>
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55 /// <param name="hostBounds">The host bounds.</param>
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56 /// <param name="windowBounds">The window bounds.</param>
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57 /// <returns>
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58 /// The inertial motion parameters: distance and duration.
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59 /// </returns>
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60 public InertialMotion GetInertialMotionParameters(Rect hostBounds, Rect windowBounds)
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61 {
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62 if (mouseTrails.Count < 2) return null;
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63
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64 var mouseTrailsArray = mouseTrails.ToArray();
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65
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66 Point startPosition = mouseTrailsArray[0].Position;
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67 DateTime startTime = mouseTrailsArray[0].Timestamp;
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68 Point endPosition = mouseTrailsArray[mouseTrails.Count - 1].Position;
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69 DateTime endTime = mouseTrailsArray[mouseTrails.Count - 1].Timestamp;
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70
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71 double timeBetweenNowAndLastMove = (DateTime.Now - endTime).TotalMilliseconds;
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72 Vector2 vector = new Vector2(startPosition, endPosition);
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73
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74 if (timeBetweenNowAndLastMove < DELAY_BEFORE_MOUSE_UP_IN_MILLISECONDS && !vector.IsZero)
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75 {
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76 double time = (endTime - startTime).TotalSeconds;
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77 time = (time == 0) ? 0.001 : time;
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78
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79 double distance = vector.Length / pixelsPerMeter;
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80
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81 double intialVelocity = distance / time;
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82
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83 double expectedDistance = ((intialVelocity * intialVelocity) / (2 * COEFFICIENT_OF_SLIDING_FRICTION * GRAVITATIONAL_ACCELERATION));
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84 double expectedTime = (2 * expectedDistance) / intialVelocity;
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85
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86 double shiftX = Math.Round(vector.LengthX * expectedDistance / distance);
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87 double shiftY = Math.Round(vector.LengthY * expectedDistance / distance);
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88
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89 // New Inertial Motion Vector
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90 Vector2 imVector = new Vector2(endPosition, shiftX, shiftY).Round();
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91 double expectedLength = imVector.Length;
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92
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93 Rect bounds = hostBounds.Add(-windowBounds.Width, -windowBounds.Height);
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94
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95 if (bounds.Contains(endPosition))
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96 {
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97 imVector = EnsureEndPointInBounds(imVector, bounds).Round();
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98 }
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99 else if (hostBounds.Contains(endPosition))
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100 {
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101 imVector = EnsureEndPointInBounds(imVector, hostBounds).Round();
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102 }
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103
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104 // Reduce expected time if the Inertial Motion Vector was truncated by the bounds
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105 double realTime = (expectedLength == 0) ? 0 : (expectedTime * imVector.Length / expectedLength);
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106
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107 var motion = new InertialMotion()
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108 {
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109 Seconds = realTime,
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110 EndPosition = imVector.End,
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111 EasingFunction = new CubicEase()
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112 {
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113 EasingMode = EasingMode.EaseOut
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114 }
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115 };
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116
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117 return motion;
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118 }
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119
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120 return null;
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121 }
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122
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123 /// <summary>
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124 /// Ensures the end point is in bounds.
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125 /// </summary>
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126 /// <param name="vector">The vector to check its ending point.</param>
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127 /// <param name="bounds">The bounds.</param>
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128 /// <returns>A vector with the ending point within specified bounds.</returns>
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129 private Vector2 EnsureEndPointInBounds(Vector2 vector, Rect bounds)
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130 {
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131 if (!vector.IsZero && !bounds.Contains(vector.End))
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132 {
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133 if (vector.IsVertical)
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134 {
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135 vector.End = vector.End.EnsureInVerticalBounds(bounds);
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136 }
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137 else if (vector.IsHorizontal)
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138 {
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139 vector.End = vector.End.EnsureInHorizontalBounds(bounds);
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140 }
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141 else
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142 {
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143 double k = (vector.LengthY) / (vector.LengthX);
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144 Point point = vector.End;
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145
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146 if (vector.End.X < bounds.Left || vector.End.X > bounds.Right)
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147 {
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148 point = point.EnsureInHorizontalBounds(bounds);
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149 point.Y = (k * (point.X - vector.Start.X)) + vector.Start.Y;
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150 }
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151
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152 if (point.Y < bounds.Top || point.Y > bounds.Bottom)
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153 {
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154 point = point.EnsureInVerticalBounds(bounds);
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155 point.X = ((point.Y - vector.Start.Y) / k) + vector.Start.X;
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156 }
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157
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158 vector.End = point.EnsureInBounds(bounds);
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159 }
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160 }
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161
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162 return vector;
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163 }
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164 }
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165 }