It is possible to configure widgets (of dashboard snap4city builder) for showing single trend and curved lines, multiseries to show not interpolated lines but ON/OFF trends.
the feature is accessible from the more options:
-- in single trend in the selection option "line shape", which can be: smooth (interpolated), or steps (on/off)
-- in curved lines / multiseries in the selection option "line shape", which can be: smooth (interpolated), or steps (on/off)
-- end --
