27 Drawing Contracts

The Racket Drawing Toolkit

1	Overview
2	bitmap%
3	bitmap-dc%
4	brush%
5	brush-list%
6	color%
7	color-database<%>
8	dc<%>
9	dc-path%
10	font%
11	font-list%
12	font-name-directory<%>
13	gl-config%
14	gl-context<%>
15	linear-gradient%
16	pdf-dc%
17	pen%
18	pen-list%
19	point%
20	post-script-dc%
21	ps-setup%
22	radial-gradient%
23	record-dc%
24	region%
25	svg-dc%
26	Drawing Functions
27	Drawing Contracts
28	Signature and Unit
29	Unsafe Libraries
30	Drawing Conveniences
31	Platform Dependencies
	Bibliography
	Index

在本页中：

font-smoothing/ c

font-hinting/ c

pen-cap-style/ c

pen-join-style/ c

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27 Drawing Contracts

This page documents the contracts that are used to describe the specification of racket/draw objects and functions.

值
font-family/c : flat-contract?

Recognizes font designations. Corresponds to the family initialization argument of the font% class.

Equivalent to the following definition:

(or/c 'default 'decorative 'roman 'script 'swiss
'modern 'symbol 'system)

值
font-style/c : flat-contract?

Recognizes font styles. Corresponds to the style initialization argument of the font% class.

Equivalent to the following definition:

(or/c 'normal 'italic 'slant)

值
font-weight/c : flat-contract?

Recognizes font weights. Corresponds to the weight initialization argument of the font% class.

Equivalent to the following definition:

(or/c (integer-in 100 1000)
'thin 'ultralight 'light 'semilight 'book 'normal
'medium 'semibold 'bold 'ultrabold 'heavy 'ultraheavy)

修改于package draw-lib的1.14版本：Changed to allow integer values and the symbols 'thin, 'ultralight, 'semilight, 'book, 'medium, 'semibold, 'ultrabold, 'heavy, and 'ultraheavy.

值
font-smoothing/c : flat-contract?

Recognizes a font smoothing amount. Corresponds to the smoothing initialization argument of the font% class.

Equivalent to the following definition:

(or/c 'default 'partly-smoothed
'smoothed 'unsmoothed)

值
font-hinting/c : flat-contract?

Recognizes font hinting modes. Corresponds to the hinting initialization argument of the font% class.

Equivalent to the following definition:

(or/c 'aligned 'unaligned)

值
pen-style/c : flat-contract?

Recognizes pen styles. Corresponds to the style initialization argument of the pen% class.

Equivalent to the following definition:

(or/c 'transparent 'solid 'xor 'hilite
      'dot 'long-dash 'short-dash 'dot-dash
      'xor-dot 'xor-long-dash 'xor-short-dash
      'xor-dot-dash)

值
pen-cap-style/c : flat-contract?

Recognizes pen cap styles. Corresponds to the cap initialization argument of the pen% class.

Equivalent to the following definition:

(or/c 'round 'projecting 'butt)

值
pen-join-style/c : flat-contract?

Recognizes pen join styles. Corresponds to the join initialization argument of the pen% class.

Equivalent to the following definition:

(or/c 'round 'bevel 'miter)

值
brush-style/c : flat-contract?

Recognizes brush styles. Corresponds to the style initialization argument of the brush% class.

Equivalent to the following definition:

(or/c 'transparent 'solid 'opaque
      'xor 'hilite 'panel
      'bdiagonal-hatch 'crossdiag-hatch
      'fdiagonal-hatch 'cross-hatch
      'horizontal-hatch 'vertical-hatch)

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