►GUI: Racket Graphics Toolkit
►2 Reference
▼2.3 Drawing Classes
2.3.1 bitmap%
2.3.2 bitmap-dc%
2.3.3 brush%
2.3.4 brush-list%
2.3.5 color%
2.3.6 color-database<%>
2.3.7 dc<%>
2.3.8 dc-path%
2.3.9 font%
2.3.10 font-list%
2.3.11 font-name-directory<%>
2.3.12 gl-config%
2.3.13 gl-context<%>
2.3.14 pen%
2.3.15 pen-list%
2.3.16 point%
2.3.17 post-script-dc%
2.3.18 printer-dc%
2.3.19 ps-setup%
2.3.20 region%
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find-or-create-brush
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brush-list% : class?

  superclass: object%

A brush-list% object maintains a list of brush% objects to avoid creating brushes repeatedly. A brush% object in a brush list cannot be mutated.

A global brush list, the-brush-list, is created automatically.

(new brush-list%) → (is-a?/c brush-list%)
Creates an empty brush list.

(send a-brush-list find-or-create-brush color 
  style) 
 → (is-a?/c brush%)
  color : (is-a?/c color%)
  style : 
(one-of/c 'transparent 'solid 'opaque
          'xor 'hilite 'panel
          'bdiagonal-hatch 'crossdiag-hatch
          'fdiagonal-hatch 'cross-hatch
          'horizontal-hatch 'vertical-hatch)
(send a-brush-list find-or-create-brush color-name 
  style) 
 → (or/c (is-a?/c brush%) false/c)
  color-name : string?
  style : 
(one-of/c 'transparent 'solid 'opaque
          'xor 'hilite 'panel
          'bdiagonal-hatch 'crossdiag-hatch
          'fdiagonal-hatch 'cross-hatch
          'horizontal-hatch 'vertical-hatch)
Finds a brush of the given specification, or creates one and adds it to the list. See brush% for a further explanation of the arguments, which are the same as brush%’s initialization arguments.

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