# 2.10.7 Preferences Dialog

This dialog controls some parameters which likely will not be changed frequently.

  Angles - controls the angle system. Polar: 0° is up and angles are measured clockwise, or Cartesian: 0° is to the right and angles are measured counter-clockwise.

  Balloon Help - disables the display of Balloon Help (Section B.1) which usually is shown when the cursor is placed over a control.

  Check Point - specifies the Check Point frequency; the number of modifications made to the layout since the last save. The layout is automatically saved to the Check Point file (Section 1.9.3) when the Check Point frequency is reached. Setting this value to 0 disables use of the Checkpoint file.

  Connection Angle - as below for Connection Distance for the angle between endpoints.

  Connection Distance - the maximum distance between endpoints that can be connected. This affects the Join (Section 2.2.6) command and auto-connection during Parallel (Section 2.1.5) commands and placing Turnouts (Section 2.7). The default value for this field is 0.100 inches or 0.254 CM. Changing this value is not recommended.

  Drag Distance - controls how far you can move the cursor (in pixels) before XTrackCAD considers the action to be a drag instead of a click.

  Drag Timeout - controls how long you can hold a mouse button down (in milliseconds) before XTrackCAD considers the action to be a drag instead of a click.

  Length Format - controls how lengths are displayed. Combinations of feet and inches (or meters, centimeters and millimeters) with support for decimal or fractional measures. Note: lengths can be entered in any format and are converted on entry.

  Max Coupling Speed - trains (Section 2.9.7) moving faster than this speed will crash when running into other trains or hitting the end of a track or an open turnout. Crashed trains must be manually moved back onto the track.

  Min Grid Spacing - minimum distance between Grid (Section 2.12.1) lines (in pixels). If the grid lines are closer then drawing them is suppressed.

  Min Track Length - specifies the minimum length of a track. Shorter tracks will not be created.

  On Program Startup - if set to ‘Load Last Layout’, XTrackCAD will automatically re-open the layout file that was open when XTrackCAD last closed. Selecting ‘Start New Layout’ opens a blank layout canvas.

  Turntable Angle - minimum angle between adjacent tracks connected to a Turntable (Section 2.1.9).

  Units - choose between English (inches) or Metric (centimeters) measurements.