Using an end of main relation

With the End of main relation method the user can specify the distance between the first start relation and the first point of hull line or between the last first end relation and the first point of a hull line. The user can also define distance values for the last relations. The image below shows a group of hull lines where the distance between the firs start relation and the first point of the first hull line is 500 whereas the distance between the first end relation and the first point of the last hull line is -700.

MR_F	first main relation
MR_L	last main relation
SR_F	first start relation
SR_L	last start relation
SP_F	first start position
SP_L	last start position
PLX_F	first point of hull line X
PLX_L	last point of hull line X
LX	hull line X
ER_F	first end relation
ER_L	last end relation
EP_F	first end position
EP_L	last end position
DS_F	distance of PL1_F from SP_F
DE_F	distance of PL1_F from EP_F
TD_F	total distance from start position towards the end of main first relation

How the system calculates with an end of main relation

In our example the user specifies a distance (DS_F) between the first start position (SP_F) and the first hull line (PL1_F) and a distance (DE_F) between the first end position and the end of the main relation (MR_F).

The system will compute the total distance (TD_F) from start position (SP_F) towards the end of the main-first relation (MR_F), considering the distance from end.

TD_F = distance(SP_F, end[MR_F]) - (DS_F + DE_F)

The total distance and the total amount of desired hull lines is considered to compute the increment step (I_F). See increment in chapter 'Using an Increment':

I_F = TD_F / (amount of hull lines-1)

This computed increment is not displayed in the Increment field.

Go to Using an increment and Using an end of main relation to learn about the two other methods in the Pattern tab.