4.2 Label Commands

Label commands are useful to mark segments or angles with usual symbols, or to write point names. As for drawing commands, a label command is either a single or a multiple statement.

Example: label B.C double

Example:

     label blue
       A.B
       B.C cross, black
       E.F double
     end

Local parameters override global ones.

Label parameters

Segment mark shape

simple (default), double, triple, cross.

Angle mark shape

simple (default), double, triple, right, forth, back.

Angle mark decoration

none (default), dotted, dashed.

Color

black (default), darkgray, gray, lightgray, white, red, green, blue, cyan, magenta, yellow.

Scale factor

A number greater than 0 (default: 1).

Font

font(s) where s is a string containing the font description.

Single label statements

label s list

Marks segment s where list may contain shape, color and scale parameters.

label B, A, C list

Marks angle BAC (i.e. angle from ray AB to ray AC in anticlockwise direction) where list may contain shape, decoration, color and scale parameters. The forth and back shape yield arrowed angle marks (respectively in direct and reverse direction). The dotted decoration adds a dot inside the angle mark. The dashed decoration adds a tick on the angle mark.

label P a list

Assuming variable P contains a point, writes the name of P in direction a from P, where list may contain color, scale and font parameters. The scale factor determines the distance from the center of the label to the point (default: 3 mm).