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arrow->compute
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class arrow
Send methods
arrow->compute
arrow->geometry
arrow->initialise
arrow->reference_x
arrow->reference_y
arrow ->compute:
Compute -left, -right and
graphical
<-
area
from the
arrow
<-
tip
,
arrow
<-
reference
,
arrow
<-
length
and
arrow
<-
wing
to speed up redraw.