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PR 9833

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svn: r12033
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Robby Findler 2008-10-14 13:52:25 +00:00
parent 8b595ed120
commit b3701d6f76
1 changed files with 6 additions and 2 deletions
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8
collects/teachpack/htdp/scribblings/image.scrbl
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@ -110,8 +110,12 @@ basic properties of images.
For the composition of images, you must know about @emph{pinholes}. Each
image, including primitive ones, come with a pinhole. For images created
with the above primitives, the pinhole is at the center of the shape except
for those created from @scheme[line] and @scheme[text], which have pinholes
at the top left. The pinhole can be moved, of course, and compositions
for those created from @scheme[line] and @scheme[text].
The @scheme[text] function puts the pinhole at the upper left corner of
the image, and @scheme[line] puts the pinhole at the beginning of the line
(meaning that if the first two arguments to @scheme[line] are positive,
the pinhole is also in the upper left corner).
The pinhole can be moved, of course, and compositions
locate pinholes according to their own rules. When in doubt you can always
find out where the pinhole is and place it where convenient.