11 Code as Picts

8.18

11 Code as Picts🔗ℹ

import: pict/rhombus

package: rhombus-pict-lib

The pict/rhombus library provides a rhombus form form rendering literal shrubbery forms as a pict.

expression

rhombus(form)

expression

rhombus(form, space)

space

~var

~datum

~value

~result

builtin_space_keyword

symbol

symbol / space

Produces a pict that renders the text of form. Comments in form are discarded, and extra spacing is removed, but the text of shrubbery elements that have multiple representations (such as 10, 0xA, and 000010) is preserved verbatim.

Within form, #, followed by a parenthesized expression is an escape where the expression must produce a pict. The pict is rendered in place of the escape.

If space is provided as ~var, then form is italicized. If space is ~datum, then form does not get a color. If space is ~value or ~result, then a corersponding uniform color is applied. Any other space determines the initial space for rendering form sensitive to meta_label imports.

> rhombus(1+2)
> rhombus(arg, ~var)
> rhombus(3, ~result)

expression

rhombusblock(form, ...)

Produces a pict that renders the text of form verbatim, preserving whitespace and comments, except that #, followed by a parenthesized expression is an escape that must produce a pict to render in place of the escape.

Use rhombusblock with @ notation (see At-Notation Using @) to avoid the need to include , between multiple groups that are on separate lines.

> @rhombusblock(
   // This is an example function:
   fun add1(n):
     n + 1
  )

fun make_example(n, res):
  @rhombusblock(
    check: add1(#,(n))
           ~is #,(res)
  )

> make_example(@rhombus(3), @rhombus(4))
> make_example(@rhombus(3).scale(2), @rhombus(4).scale(2))

expression

rhombusblock_etc:

group

...

expression

rhombusblock_etc (option, ...):

group

...

Like rhombusblock, but with options that are the same as for Scribble’s rhombusblock_etc. In particular, using the ~escape: op option changes the escape operator from #, to op.

> rhombusblock_etc(~escape: $$):
    // example use of `rhombusblock`
    @rhombusblock(
      check: add1(#,(n))
             ~is #,(res)
    )

context parameter

Parameter.def current_paren_color :: Color || String:

"brown"

context parameter

Parameter.def current_literal_color :: Color || String:

"forestgreen"

context parameter

Parameter.def current_identifier_color :: Color || String:

"black"

context parameter

Parameter.def current_comment_color :: Color || String:

"chocolate"

context parameter

Parameter.def current_result_color :: Color || String:

"darkblue"

context parameter

Parameter.def current_rhombus_colorize :: Any.to_boolean:

#true

context parameter

Parameter.def current_rhombus_tt :: Function.of_arity(1)

Parameters that control the output of rhombus and rhombusblock.

The value of current_rhombus_tt is a function that takes a string and produces a pict for a shrubbery element. The result may be colorized, and the current font may have been adjusted to italic for ~var mode.

1	Overview
2	Pict Objects
3	Pict Constructors
4	Pict Combiners
5	Pict Animators
6	Pict Rebuilds
7	Pict Finders
8	Pict Text Layout
9	Pict Radial Shapes
10	Pict Speech Balloons
11	Code as Picts