1 | unit Track;
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2 |
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3 | interface
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4 |
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5 | uses
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6 | Classes, SysUtils, Math, Generics.Collections, Geometric, DOM, XML, Items;
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7 |
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8 | type
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9 | TTrack = class;
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10 | TTrackPoint = class;
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11 | TTrackPoints = class;
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12 | TTrackLink = class;
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13 | TTrackLinks = class;
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14 |
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15 | { TTrackPosition }
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16 |
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17 | TTrackPosition = record
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18 | BaseTrackPoint: TTrackPoint;
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19 | RelPos: Double;
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20 | function GetTrackPosition: Integer;
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21 | function GetVector: TVector;
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22 | procedure Move(Distance: Double);
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23 | procedure LoadFromXmlNode(Node: TDOMNode; Points: TTrackPoints);
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24 | procedure SaveToXmlNode(Node: TDOMNode);
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25 | end;
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26 |
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27 | { TTrackPoint }
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28 |
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29 | TTrackPoint = class(TItem)
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30 | OwnerPoint: TObject;
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31 | Position: TPoint;
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32 | PositionDesigned: TPoint;
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33 | Pending: Boolean;
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34 | Track: TTrack;
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35 | NeighPoints: TTrackPoints;
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36 | NeighLinks: TTrackLinks;
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37 | LinkUp: TTrackLink;
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38 | LinkDown: TTrackLink;
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39 | procedure Connect(TrackPoint: TTrackPoint);
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40 | procedure Disconnect(TrackPoint: TTrackPoint);
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41 | function GetDown: TTrackPoint;
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42 | function GetUp: TTrackPoint;
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43 | function GetNeighDown: TTrackPoint;
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44 | function GetNeighUp: TTrackPoint;
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45 | function GetLinkDown: TTrackLink;
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46 | function GetLinkUp: TTrackLink;
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47 | function GetTrackPosition: Integer;
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48 |
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49 | // Move to TTrackLink later
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50 | function GetDistance: Integer;
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51 |
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52 | class function GetClassSysName: string; override;
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53 | procedure LoadFromXmlNode(Node: TDOMNode); override;
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54 | procedure SaveToXmlNode(Node: TDOMNode); override;
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55 | constructor Create;
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56 | destructor Destroy; override;
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57 | end;
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58 |
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59 | { TTrackPoints }
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60 |
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61 | TTrackPoints = class(TItems<TTrackPoint>)
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62 | Track: TTrack;
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63 | class function GetClassSysName: string; override;
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64 | function CreateItem: TTrackPoint; override;
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65 | procedure ResetToDesignatedPosition;
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66 | end;
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67 |
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68 | { TTrackLink }
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69 |
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70 | TTrackLink = class(TItem)
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71 | Points: TTrackPoints;
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72 | Shift: TPoint;
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73 | class function GetClassSysName: string; override;
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74 | procedure LoadFromXmlNode(Node: TDOMNode); override;
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75 | procedure SaveToXmlNode(Node: TDOMNode); override;
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76 | constructor Create;
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77 | destructor Destroy; override;
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78 | end;
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79 |
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80 | { TTrackLinks }
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81 |
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82 | TTrackLinks = class(TItems<TTrackLink>)
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83 | class function GetClassSysName: string; override;
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84 | function SearchPoints(Point1, Point2: TTrackPoint): TTrackLink;
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85 | end;
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86 |
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87 | { TTrack }
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88 |
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89 | TTrack = class(TItem)
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90 | Points: TTrackPoints;
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91 | Links: TTrackLinks;
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92 | Owner: TObject;
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93 | function GetLength: Integer;
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94 | procedure RouteTrack(TP1, TP2: TTrackPoint);
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95 | procedure RemoveTrackBetween(TP1, TP2: TTrackPoint);
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96 | constructor Create;
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97 | destructor Destroy; override;
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98 | class function GetClassSysName: string; override;
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99 | procedure LoadFromXmlNode(Node: TDOMNode); override;
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100 | procedure SaveToXmlNode(Node: TDOMNode); override;
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101 | end;
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102 |
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103 | { TTrackPointsAngle }
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104 |
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105 | TTrackPointsAngle = class
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106 | Angle: Double;
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107 | TrackLinks: TTrackLinks;
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108 | constructor Create;
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109 | destructor Destroy; override;
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110 | end;
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111 |
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112 | { TTrackPointsAngleGroup }
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113 |
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114 | TTrackPointsAngleGroup = class(TObjectList<TTrackPointsAngle>)
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115 | function SearchAngle(Angle: Double): TTrackPointsAngle;
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116 | end;
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117 |
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118 |
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119 | implementation
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120 |
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121 | resourcestring
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122 | SAlreadyConnectedTrackPoint = 'Trying to connect already connected track point';
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123 | SAlreadyDisconnectedTrackPoint = 'Trying to disconnect not connected track point';
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124 | STrackPointNotFound = 'Track point %d not found';
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125 |
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126 | { TTrackPosition }
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127 |
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128 | function TTrackPosition.GetTrackPosition: Integer;
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129 | begin
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130 | Result := Round(RelPos);
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131 | if Assigned(BaseTrackPoint) then
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132 | Result := Result + BaseTrackPoint.GetTrackPosition;
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133 | end;
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134 |
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135 | function TTrackPosition.GetVector: TVector;
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136 | var
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137 | D: Integer;
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138 | UpPoint: TTrackPoint;
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139 | begin
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140 | Result.Position := Point(0, 0);
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141 | if Assigned(BaseTrackPoint) then
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142 | with BaseTrackPoint do begin
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143 | UpPoint := BaseTrackPoint.GetNeighUp;
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144 | if Assigned(UpPoint) then begin
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145 | Result.Direction := SubPoint(UpPoint.Position, Position);
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146 | D := Distance(UpPoint.Position, Position);
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147 | if D > 0 then begin
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148 | Result.Position := Point(Trunc(Position.X + Result.Direction.X * RelPos / D),
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149 | Trunc(Position.Y + Result.Direction.Y * RelPos / D));
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150 | end else begin
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151 | Result.Position := Position;
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152 | end;
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153 | end;
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154 | end;
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155 | end;
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156 |
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157 | procedure TTrackPosition.Move(Distance: Double);
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158 | var
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159 | Direction: Integer;
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160 | begin
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161 | Direction := Sign(Distance);
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162 | Distance := Abs(Distance);
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163 | while Distance > 0 do begin
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164 | if Direction > 0 then begin
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165 | if RelPos + Distance < BaseTrackPoint.GetDistance then begin
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166 | RelPos := RelPos + Distance;
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167 | Distance := 0;
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168 | end else begin
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169 | if Assigned(BaseTrackPoint.GetNeighUp) then begin
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170 | Distance := Distance - (BaseTrackPoint.GetDistance - RelPos);
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171 | BaseTrackPoint := BaseTrackPoint.GetNeighUp;
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172 | RelPos := 0;
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173 | end else
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174 | // Reverse direction at the end of track
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175 | Direction := -Direction;
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176 | end;
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177 | end else
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178 | if Direction < 0 then begin
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179 | if RelPos - Distance >= 0 then begin
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180 | RelPos := RelPos - Distance;
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181 | Distance := 0;
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182 | end else begin
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183 | if Assigned(BaseTrackPoint.GetNeighDown) then begin
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184 | Distance := Distance - RelPos;
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185 | BaseTrackPoint := BaseTrackPoint.GetNeighDown;
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186 | RelPos := BaseTrackPoint.GetDistance;
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187 | end else
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188 | // Reverse direction at the end of track
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189 | Direction := -Direction;
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190 | end;
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191 | end;
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192 | end;
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193 | end;
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194 |
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195 | procedure TTrackPosition.LoadFromXmlNode(Node: TDOMNode; Points: TTrackPoints);
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196 | begin
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197 | RelPos := ReadDouble(Node, 'RelPos', RelPos);
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198 | BaseTrackPoint := Points.FindById(ReadInteger(Node, 'BaseTrackPoint', 0));
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199 | end;
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200 |
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201 | procedure TTrackPosition.SaveToXmlNode(Node: TDOMNode);
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202 | begin
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203 | WriteDouble(Node, 'RelPos', RelPos);
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204 | if Assigned(BaseTrackPoint) then
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205 | WriteInteger(Node, 'BaseTrackPoint', BaseTrackPoint.Id)
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206 | else WriteInteger(Node, 'BaseTrackPoint', 0)
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207 | end;
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208 |
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209 | { TTrackLinks }
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210 |
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211 | class function TTrackLinks.GetClassSysName: string;
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212 | begin
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213 | Result := 'Links';
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214 | end;
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215 |
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216 | function TTrackLinks.SearchPoints(Point1, Point2: TTrackPoint): TTrackLink;
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217 | var
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218 | I: Integer;
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219 | begin
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220 | I := 0;
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221 | while (I < 0) and
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222 | ((Items[I].Points.First <> Point1) or (Items[I].Points.Last <> Point2)) and
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223 | ((Items[I].Points.First <> Point2) or (Items[I].Points.Last <> Point1)) do
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224 | Inc(I);
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225 | if I < 0 then Result := Items[I]
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226 | else Result := nil;
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227 | end;
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228 |
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229 | { TTrackPoints }
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230 |
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231 | class function TTrackPoints.GetClassSysName: string;
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232 | begin
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233 | Result := 'Points';
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234 | end;
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235 |
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236 | function TTrackPoints.CreateItem: TTrackPoint;
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237 | begin
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238 | Result := inherited;
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239 | Result.Track := Track;
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240 | end;
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241 |
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242 | procedure TTrackPoints.ResetToDesignatedPosition;
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243 | var
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244 | I: Integer;
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245 | begin
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246 | for I := 0 to Count - 1 do
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247 | Items[I].Position := Items[I].PositionDesigned;
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248 | end;
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249 |
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250 | { TTrack }
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251 |
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252 | constructor TTrack.Create;
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253 | begin
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254 | Points := TTrackPoints.Create;
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255 | Points.Track := Self;
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256 | Links := TTrackLinks.Create;
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257 | end;
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258 |
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259 | destructor TTrack.Destroy;
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260 | begin
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261 | FreeAndNil(Points);
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262 | FreeAndNil(Links);
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263 | inherited;
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264 | end;
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265 |
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266 | class function TTrack.GetClassSysName: string;
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267 | begin
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268 | Result := 'Track';
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269 | end;
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270 |
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271 | procedure TTrack.LoadFromXmlNode(Node: TDOMNode);
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272 | var
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273 | NewNode: TDOMNode;
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274 | begin
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275 | NewNode := Node.FindNode(DOMString(TTrackPoints.GetClassSysName));
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276 | if Assigned(NewNode) then
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277 | Points.LoadFromXmlNode(NewNode);
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278 |
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279 | NewNode := Node.FindNode(DOMString(TTrackLinks.GetClassSysName));
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280 | if Assigned(NewNode) then
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281 | Links.LoadFromXmlNode(NewNode);
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282 | end;
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283 |
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284 | procedure TTrack.SaveToXmlNode(Node: TDOMNode);
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285 | var
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286 | NewNode: TDOMNode;
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287 | begin
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288 | Points.RebuildItemsId;
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289 | Links.RebuildItemsId;
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290 |
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291 | NewNode := Node.OwnerDocument.CreateElement(DOMString(TTrackPoints.GetClassSysName));
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292 | Node.AppendChild(NewNode);
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293 | Points.SaveToXmlNode(NewNode);
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294 |
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295 | NewNode := Node.OwnerDocument.CreateElement(DOMString(TTrackLinks.GetClassSysName));
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296 | Node.AppendChild(NewNode);
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297 | Links.SaveToXmlNode(NewNode);
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298 | end;
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299 |
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300 | function TTrack.GetLength: Integer;
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301 | var
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302 | I: Integer;
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303 | begin
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304 | Result := 0;
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305 | for I := 0 to Points.Count - 1 do
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306 | if I > 0 then
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307 | Result := Result + Distance(Points[I].Position, Points[I - 1].Position);
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308 | end;
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309 |
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310 | procedure TTrack.RouteTrack(TP1, TP2: TTrackPoint);
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311 | var
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312 | NewTrackPoint: TTrackPoint;
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313 | Delta: TPoint;
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314 | P1, P2: TPoint;
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315 | Index1, Index2: Integer;
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316 | begin
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317 | RemoveTrackBetween(TP1, TP2);
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318 | Index1 := Points.IndexOf(TP1);
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319 | Index2 := Points.IndexOf(TP2);
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320 | P1 := Points[Index1].PositionDesigned;
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321 | P2 := Points[Index2].PositionDesigned;
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322 | NewTrackPoint := Points.CreateItem;
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323 | Delta := Point(P2.X - P1.X, P2.Y - P1.Y);
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324 | if Abs(Delta.X) > Abs(Delta.Y) then begin
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325 | NewTrackPoint.PositionDesigned := Point(P2.X - Sign(Delta.X) * Abs(Delta.Y), P1.Y);
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326 | NewTrackPoint.Position := NewTrackPoint.PositionDesigned;
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327 | end else begin
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328 | NewTrackPoint.PositionDesigned := Point(P1.X, P2.Y - Sign(Delta.Y) * Abs(Delta.X));
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329 | NewTrackPoint.Position := NewTrackPoint.PositionDesigned;
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330 | end;
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331 | Points.Insert(Index1 + 1, NewTrackPoint);
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332 | end;
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333 |
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334 | procedure TTrack.RemoveTrackBetween(TP1, TP2: TTrackPoint);
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335 | var
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336 | Index1, Index2: Integer;
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337 | Temp: Integer;
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338 | I: Integer;
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339 | begin
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340 | Index1 := Points.IndexOf(TP1);
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341 | Index2 := Points.IndexOf(TP2);
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342 | if (Index1 = -1) then
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343 | raise Exception.Create(Format(STrackPointNotFound, [1]));
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344 | if (Index2 = -1) then
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345 | raise Exception.Create(Format(STrackPointNotFound, [2]));
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346 | if Index1 > Index2 then begin
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347 | Temp := Index1;
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348 | Index1 := Index2;
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349 | Index2 := Temp;
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350 | end;
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351 | for I := 1 to Index2 - Index1 - 1 do
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352 | Points.Delete(Index1 + 1);
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353 | end;
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354 |
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355 | { TTrackLink }
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356 |
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357 | class function TTrackLink.GetClassSysName: string;
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358 | begin
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359 | Result := 'Link';
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360 | end;
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361 |
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362 | procedure TTrackLink.LoadFromXmlNode(Node: TDOMNode);
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363 | begin
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364 | inherited;
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365 | end;
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366 |
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367 | procedure TTrackLink.SaveToXmlNode(Node: TDOMNode);
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368 | begin
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369 | inherited;
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370 | end;
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371 |
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372 | constructor TTrackLink.Create;
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373 | begin
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374 | Points := TTrackPoints.Create;
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375 | Points.OwnsObjects := False;
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376 | end;
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377 |
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378 | destructor TTrackLink.Destroy;
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379 | begin
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380 | FreeAndNil(Points);
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381 | inherited;
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382 | end;
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383 |
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384 | { TTrackPointsAngleGroup }
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385 |
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386 | function TTrackPointsAngleGroup.SearchAngle(Angle: Double): TTrackPointsAngle;
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387 | var
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388 | I: Integer;
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389 | begin
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390 | I := 0;
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391 | while (I < Count) and (Items[I].Angle <> Angle) do Inc(I);
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392 | if I < Count then Result := Items[I]
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393 | else Result := nil;
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394 | end;
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395 |
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396 | { TTrackPointsAngle }
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397 |
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398 | constructor TTrackPointsAngle.Create;
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399 | begin
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400 | TrackLinks := TTrackLinks.Create;
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401 | TrackLinks.OwnsObjects := False;
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402 | end;
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403 |
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404 | destructor TTrackPointsAngle.Destroy;
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405 | begin
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406 | FreeAndNil(TrackLinks);
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407 | inherited;
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408 | end;
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409 |
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410 | { TTrackPoint }
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411 |
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412 | procedure TTrackPoint.Connect(TrackPoint: TTrackPoint);
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413 | var
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414 | NewLink: TTrackLink;
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415 | begin
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416 | if NeighPoints.IndexOf(TrackPoint) = -1 then begin
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417 | NeighPoints.Add(TrackPoint);
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418 | TrackPoint.NeighPoints.Add(Self);
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419 |
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420 | // Add new link to both self and connected track point
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421 | NewLink := Track.Links.CreateItem;
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422 | NewLink.Points.Add(TrackPoint);
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423 | NewLink.Points.Add(Self);
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424 | NeighLinks.Add(NewLink);
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425 | TrackPoint.NeighLinks.Add(NewLink);
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426 | Track.Links.Add(NewLink);
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427 | end else raise Exception.Create(SAlreadyConnectedTrackPoint);
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428 | end;
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429 |
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430 | procedure TTrackPoint.Disconnect(TrackPoint: TTrackPoint);
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431 | var
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432 | Index: Integer;
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433 | Link: TTrackLink;
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434 | begin
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435 | Index := NeighPoints.IndexOf(TrackPoint);
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436 | if NeighPoints.IndexOf(TrackPoint) <> -1 then begin
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437 | NeighPoints.Delete(Index);
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438 | TrackPoint.NeighPoints.Remove(Self);
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439 |
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440 | // Remove link from both track points
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441 | Link := NeighLinks.SearchPoints(Self, TrackPoint);
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442 | NeighLinks.Remove(Link);
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443 | TrackPoint.NeighLinks.Remove(Link);
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444 | Track.Links.Remove(Link);
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445 | end else raise Exception.Create(SAlreadyDisconnectedTrackPoint);
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446 | end;
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447 |
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448 | function TTrackPoint.GetDown: TTrackPoint;
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449 | var
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450 | I: Integer;
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451 | begin
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452 | I := Track.Points.IndexOf(Self) - 1;
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453 | while (I >= 0) and not Assigned(Track.Points[I].OwnerPoint) do
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454 | Dec(I);
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455 | if I >= 0 then Result := Track.Points[I]
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456 | else Result := nil;
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457 | end;
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458 |
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459 | function TTrackPoint.GetUp: TTrackPoint;
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460 | var
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461 | I: Integer;
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462 | begin
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463 | I := Track.Points.IndexOf(Self) + 1;
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464 | while (I < Track.Points.Count) and not Assigned(Track.Points[I].OwnerPoint) do
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465 | Inc(I);
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466 | if I < Track.Points.Count then Result := Track.Points[I]
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467 | else Result := nil;
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468 | end;
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469 |
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470 | function TTrackPoint.GetNeighDown: TTrackPoint;
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471 | var
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472 | NewIndex: Integer;
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473 | begin
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474 | Result := nil;
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475 | NewIndex := Track.Points.IndexOf(Self) - 1;
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476 | if NewIndex >= 0 then Result := Track.Points[NewIndex];
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477 | end;
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478 |
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479 | function TTrackPoint.GetNeighUp: TTrackPoint;
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480 | var
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481 | NewIndex: Integer;
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482 | begin
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483 | Result := nil;
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484 | if Assigned(Track) then begin
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485 | NewIndex := Track.Points.IndexOf(Self) + 1;
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486 | if NewIndex < Track.Points.Count then Result := Track.Points[NewIndex];
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487 | end;
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488 | end;
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489 |
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490 | function TTrackPoint.GetLinkDown: TTrackLink;
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491 | begin
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492 | if Assigned(LinkDown) then Result := LinkDown
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493 | else begin
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494 | LinkDown := TTrackLink.Create;
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495 | LinkDown.Points.Add(GetNeighDown);
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496 | LinkDown.Points.Add(Self);
|
---|
497 | Result := LinkDown;
|
---|
498 | GetNeighDown.LinkUp := LinkDown;
|
---|
499 | end;
|
---|
500 | end;
|
---|
501 |
|
---|
502 | function TTrackPoint.GetLinkUp: TTrackLink;
|
---|
503 | begin
|
---|
504 | if Assigned(LinkUp) then Result := LinkUp
|
---|
505 | else begin
|
---|
506 | LinkUp := TTrackLink.Create;
|
---|
507 | LinkUp.Points.Add(Self);
|
---|
508 | LinkUp.Points.Add(GetNeighUp);
|
---|
509 | Result := LinkUp;
|
---|
510 | GetNeighUp.LinkDown := LinkUp;
|
---|
511 | end;
|
---|
512 | end;
|
---|
513 |
|
---|
514 | function TTrackPoint.GetTrackPosition: Integer;
|
---|
515 | var
|
---|
516 | Index: Integer;
|
---|
517 | I: Integer;
|
---|
518 | begin
|
---|
519 | Result := 0;
|
---|
520 | Index := Track.Points.IndexOf(Self);
|
---|
521 | for I := 0 to Index - 1 do
|
---|
522 | Result := Result + Track.Points[I].GetDistance;
|
---|
523 | end;
|
---|
524 |
|
---|
525 | function TTrackPoint.GetDistance: Integer;
|
---|
526 | var
|
---|
527 | Index: Integer;
|
---|
528 | begin
|
---|
529 | Index := Track.Points.IndexOf(Self);
|
---|
530 | if Index + 1 < Track.Points.Count then begin
|
---|
531 | Result := Distance(Track.Points[Index + 1].Position, Track.Points[Index].Position);
|
---|
532 | end else Result := 0;
|
---|
533 | end;
|
---|
534 |
|
---|
535 | class function TTrackPoint.GetClassSysName: string;
|
---|
536 | begin
|
---|
537 | Result := 'Point';
|
---|
538 | end;
|
---|
539 |
|
---|
540 | procedure TTrackPoint.LoadFromXmlNode(Node: TDOMNode);
|
---|
541 | begin
|
---|
542 | inherited;
|
---|
543 | Position.X := ReadInteger(Node, 'PositionX', Position.X);
|
---|
544 | Position.Y := ReadInteger(Node, 'PositionY', Position.Y);
|
---|
545 | PositionDesigned.X := ReadInteger(Node, 'PositionDesignedX', PositionDesigned.X);
|
---|
546 | PositionDesigned.Y := ReadInteger(Node, 'PositionDesignedY', PositionDesigned.Y);
|
---|
547 | end;
|
---|
548 |
|
---|
549 | procedure TTrackPoint.SaveToXmlNode(Node: TDOMNode);
|
---|
550 | begin
|
---|
551 | inherited;
|
---|
552 | WriteInteger(Node, 'PositionX', Position.X);
|
---|
553 | WriteInteger(Node, 'PositionY', Position.Y);
|
---|
554 | WriteInteger(Node, 'PositionDesignedX', PositionDesigned.X);
|
---|
555 | WriteInteger(Node, 'PositionDesignedY', PositionDesigned.Y);
|
---|
556 | end;
|
---|
557 |
|
---|
558 | constructor TTrackPoint.Create;
|
---|
559 | begin
|
---|
560 | NeighPoints := TTrackPoints.Create;
|
---|
561 | NeighPoints.OwnsObjects := False;
|
---|
562 | NeighLinks := TTrackLinks.Create;
|
---|
563 | NeighLinks.OwnsObjects := False;
|
---|
564 | end;
|
---|
565 |
|
---|
566 | destructor TTrackPoint.Destroy;
|
---|
567 | begin
|
---|
568 | FreeAndNil(NeighLinks);
|
---|
569 | FreeAndNil(NeighPoints);
|
---|
570 | Track := nil;
|
---|
571 | OwnerPoint := nil;
|
---|
572 | inherited;
|
---|
573 | end;
|
---|
574 |
|
---|
575 | end.
|
---|
576 |
|
---|