如何在 guile 中创建 cairo 曲面

发布于 2024-09-25 20:36:59 字数 1171 浏览 8 评论 0原文

我有这段代码

guile> (cairo-pdf-surface-create "foo.pdf" 100.0 100.0)
; and get this error
standard input:29:1: In procedure cairo-pdf-surface-create in expression (cairo-pdf-surface-create "foo.pdf" 100.0 ...):
standard input:29:1: Wrong type (expecting string): 100.0
ABORT: (wrong-type-arg)

，当我使用字符串作为宽度和高度时，

guile> (cairo-pdf-surface-create "foo.pdf" "100.0" "100.0")

Backtrace:
In standard input:
  30: 0* [cairo-pdf-surface-create "foo.pdf" {"100.0"} "100.0"]

standard input:30:1: In procedure cairo-pdf-surface-create in expression (cairo-pdf-surface-create "foo.pdf" "100.0" ...):
standard input:30:1: Wrong type (expecting real number): "100.0"

文档说：

cairo-pdf-surface-create（文件名）               ;              [函数]
        （点宽度)（以点为单位的高度）
        ⇒（ret <开罗表面-t>）

原文

I have this code

guile> (cairo-pdf-surface-create "foo.pdf" 100.0 100.0)
; and get this error
standard input:29:1: In procedure cairo-pdf-surface-create in expression (cairo-pdf-surface-create "foo.pdf" 100.0 ...):
standard input:29:1: Wrong type (expecting string): 100.0
ABORT: (wrong-type-arg)

and when I use strings as width and height

guile> (cairo-pdf-surface-create "foo.pdf" "100.0" "100.0")

Backtrace:
In standard input:
  30: 0* [cairo-pdf-surface-create "foo.pdf" {"100.0"} "100.0"]

standard input:30:1: In procedure cairo-pdf-surface-create in expression (cairo-pdf-surface-create "foo.pdf" "100.0" ...):
standard input:30:1: Wrong type (expecting real number): "100.0"

Documentation says:

cairo-pdf-surface-create (filename <char>)                                 [Function]
         (width-in-points
<double>) (height-in-points <double>)
         ⇒ (ret <cairo-surface-t>)

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无妨# 2024-10-02 20:36:59

至少对于最新版本，请尝试以下操作：

(cairo-pdf-surface-create 100.0 100.0 "foo.pdf")

请参阅源，按 (sx sy 文件名) 的顺序指定参数，文件名是可选的（如果未指定，则使用当前输出端口）。

At least for the most recent version, try this:

(cairo-pdf-surface-create 100.0 100.0 "foo.pdf")

See the source, which specifies the arguments in the order (sx sy filename), with the filename being optional (using the current output port if not specified).

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