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The dash pattern (dashtype) is a separate property associated with each line, analogous to linecolor or linewidth. It is not necessary to place the current terminal in a special mode just to draw dashed lines. I.e. the old command set term <termname> {solid|dashed} is now ignored.
All lines have the property dashtype solid unless you specify otherwise. You can change the default for a particular linetype using the command set linetype so that it affects all subsequent commands, or you can include the desired dashtype as part of the plot or other command.
Syntax:
dashtype N # predefined dashtype invoked by number dashtype "pattern" # string containing a combination of the characters # dot (.) hyphen (-) underscore(_) and space. dashtype (s1,e1,s2,e2,s3,e3,s4,e4) # dash pattern specified by 1 to 4 # numerical pairs <solid length>, <emptyspace length>
Example:
# Two functions using linetype 1 but distinguished by dashtype plot f1(x) with lines lt 1 dt solid, f2(x) with lines lt 1 dt 3
Some terminals support user-defined dash patterns in addition to whatever set of predefined dash patterns they offer.
Examples:
plot f(x) dt 3 # use terminal-specific dash pattern 3 plot f(x) dt ".. " # construct a dash pattern on the spot plot f(x) dt (2,5,2,15) # numerical representation of the same pattern set dashtype 11 (2,4,4,7) # define new dashtype to be called by index plot f(x) dt 11 # plot using our new dashtype
If you specify a dash pattern using a string the program will convert this to a sequence of <solid>,<empty> pairs. Dot "." becomes (2,5), dash "-" becomes (10,10), underscore "_" becomes (20,10), and each space character " " adds 10 to the previous <empty> value. The command show dashtype will show both the original string and the converted numerical sequence.