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Description
Labels of the graphics-objects are not always displayed, even though the property-settings state otherwise.  It depends on the zoom-level.  

For all symbols, if a symbol is visible, the corresponding label is added, if there is vacant space to draw it.  If the label collides with a previously added label, usually the system tries to add the label at an alternative location.  Typically, the system tries to add the label below the symbol, if that fails, an alternative location above the symbol is tried. This could potentially fail as well; in which case no label is shown so that the final output is not cluttered.  In other cases, the system first tries to the right of the symbol and as an alternative left of the symbol.  Whether the primary placement is below and the secondary placement is above, or primary is left of and secondary is right of depends on the symbol type

#01 - Chains
If a label has a shorter length than the chain in world coordinates, it is added above the center of the chain with the same rotation.  A chain label only has a primary placement.  See Fig. 1
 


Fig. 1 - A chain label only has a primary placement

#02 - Vessel-berth lines
If a label has a shorter length than either of the vessel-berth line segments, it is added above the center of the segment with the same rotation.  A vessel-berth line label has its primary placement above the segment going from the winch to the fairlead and its secondary placement going from the fairlead to the bollard. See example in Fig. 2
 

Fig. 2
- “Line 3” at the primary placement and “Line 4” at the secondary placement
- “Winch 7” at the primary placement and “Winch 8” at the secondary placement.  Both winches have descending x-coordinates of the first face
- "Fender 2” at the primary placement and “Bollard 2” at the secondary placement

#03 - Winches
If a label has a shorter length than 2 times the width of a winch, it is added either below or above the center of the winch and aligned with the symbol direction.  This behavior depends on the direction of the first face of the transcribed rectangle of the winch.  If the first face has ascending x-coordinates, the primary label placement is above the winch and the secondary placement is below.  If the first face has descending x-coordinates, the primary placement is below the winch and the secondary placement is above.  This ensures that the labels are written primarily from left to right even though they are rotated.  This should make reading easier.  See example in Fig. 2

#04 - Fairleads
The same rule applies to the fairleads as to the winches.  Fig. 3 shows “Fairlead 3” at the primary placement and “Fairlead 4” that cannot be shown, because it collides with “Fairlead 3” at the primary placement and “Winch 4” at the secondary placement


Fig. 3 - “Fairlead 3” at the primary placement and “Fairlead 4” that cannot be shown

#05 - Bollards and Fenders
If a label is below the height of 3 times the symbol height, it is added either to the right or to the left of the symbol and always horizontally displayed.  The primary placement is to the right of the symbol and the secondary placement is to the left of the symbol.  Fig. 2 also shows “Fender 2” at the primary placement and “Bollard 2” at the secondary placement. 

Conclusion
To view the label for a specific symbol, zoom into the related symbol until the label is shown.

 

FURTHER INFORMATION & USEFUL LINKS
User Guide

MIKE 21 Maritime. MIKE 21 Mooring Analysis. User Guide
 

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