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sk requested empty scenes with optional background color

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This commit is contained in:
Matthias Felleisen 2011-07-14 12:02:40 -04:00
parent da6e819b6f
commit 40948ee653
2 changed files with 13 additions and 7 deletions
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4
collects/2htdp/private/image-more.rkt
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@ -882,10 +882,10 @@
(check-mode/color-combination 'square 3 mode color) (check-mode/color-combination 'square 3 mode color)
(make-a-polygon (rectangle-points side-length side-length) mode color)) (make-a-polygon (rectangle-points side-length side-length) mode color))
(define/chk (empty-scene width height) (define/chk (empty-scene width height [color 'white])
(crop 0 0 width height (crop 0 0 width height
(overlay (rectangle width height 'outline (pen "black" 2 'solid 'round 'round)) (overlay (rectangle width height 'outline (pen "black" 2 'solid 'round 'round))
(rectangle width height 'solid 'white)))) (rectangle width height 'solid color))))
(define/chk (rhombus side-length angle mode color) (define/chk (rhombus side-length angle mode color)
(check-mode/color-combination 'rhombus 3 mode color) (check-mode/color-combination 'rhombus 3 mode color)

16
collects/teachpack/2htdp/scribblings/image.scrbl
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@ -936,14 +936,20 @@ the @racket[point-count] argument determines how many points the star has.
Placing images into scenes is particularly useful when building worlds Placing images into scenes is particularly useful when building worlds
and universes using @racket[2htdp/universe]. and universes using @racket[2htdp/universe].
@defproc[(empty-scene [width (and/c real? (not/c negative?))] @defproc*[([(empty-scene [width (and/c real? (not/c negative?))]
[height (and/c real? (not/c negative?))]) [height (and/c real? (not/c negative?))])
image?]{ image?]
[(empty-scene [width (and/c real? (not/c negative?))]
[height (and/c real? (not/c negative?))]
[color image-color?])
image?])]{
Creates an empty scene, i.e., a rectangle with a black outline. Creates an empty scene, i.e., a white rectangle with a black outline.
@image-examples[(empty-scene 160 90)] @image-examples[(empty-scene 160 90)]
The three-argument version creates a rectangle of the specified color with
a black outline.
} }
@defproc[(place-image [image image?] [x real?] [y real?] [scene image?]) image?]{ @defproc[(place-image [image image?] [x real?] [y real?] [scene image?]) image?]{