You can also control Line Style() by number (0–4) or name (Solid, Dotted, Dashed, DashDot, DashDotDot). Figure 11.21 shows the numerical values for each line type.
linestyles = {"Solid", "Dotted", "Dashed", "DashDot", "DashDotDot"};
win = New Window( "Line Styles",
	Graph Box(
		Frame Size( 200, 200 ),
		X Scale( -1, 5 ),
		Y Scale( -1, 5 ),
		For( i = 0, i < 5, i++,
			Line Style( i );
			H Line( i );
			Text( {0, i + .1}, i );
			Text( {1, i + .1}, linestyles[i + 1] );
		)
	)
);
Figure 11.21 Line Styles
To control the thickness of lines, set a Pen Size and specify the line width in pixels. The default is 1 for single-pixel lines. For printing, think of Pen Size as a multiplier for the default line width, which varies according to your printing device.
win = New Window( "Pen Size",
	Graph Box(
		Pen Size( 2 ); // double-width lines
		Line( [10 30 90], [88 22 44] );
	)
);

Help created on 7/12/2018