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gradients get picture examples

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This commit is contained in:
Kevin Tew 2011-01-04 13:51:23 -07:00
parent d2f16ee36e
commit e35603988a
2 changed files with 47 additions and 23 deletions
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36
collects/scribblings/draw/linear-gradient-class.scrbl
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@ -3,7 +3,7 @@
scribble/eval)
@(define class-eval (make-base-eval))
@(interaction-eval #:eval class-eval (require racket/class racket/draw))
@(interaction-eval #:eval class-eval (require racket/class racket/draw slideshow/pict))
@defclass/title[linear-gradient% object% ()]{
@ -34,17 +34,29 @@ points in between.
@examples[
#:eval class-eval
(new linear-gradient%
[x0 0] [y0 100] [x1 300] [y1 100]
[stops
(list (list 0 (make-object color% 0 0 255))
(list 0.5 (make-object color% 0 255 0))
(list 1 (make-object color% 255 0 0)))])
(make-object linear-gradient%
0 100 300 100
(list (list 0 (make-object color% 0 0 255))
(list 0.5 (make-object color% 0 255 0))
(list 1 (make-object color% 255 0 0))))
(define no-pen (make-object pen% "BLACK" 1 'transparent))
(define brush-grad (new brush% [gradient
(new linear-gradient%
[x0 300] [y0 250] [x1 500] [y1 50]
[stops
(list (list 0 (make-object color% 255 0 0))
(list 0.5 (make-object color% 0 255 0))
(list 1 (make-object color% 0 0 255)))])]))
(define brush-grad2 (new brush% [gradient
(make-object linear-gradient%
50 150 250 150
(list (list 0 (make-object color% 255 0 0))
(list 0.5 (make-object color% 0 255 0))
(list 1 (make-object color% 0 0 255))))]))
(dc (lambda (dc x y)
(send dc set-pen no-pen)
(send dc set-brush brush-grad2)
(send dc draw-ellipse 50 50 200 200)
(send dc set-brush brush-grad)
(send dc draw-rectangle 300 50 200 200)) 550 300)]
]}

34
collects/scribblings/draw/radial-gradient-class.scrbl
View File

@ -3,7 +3,7 @@
scribble/eval)
@(define class-eval (make-base-eval))
@(interaction-eval #:eval class-eval (require racket/class racket/draw))
@(interaction-eval #:eval class-eval (require racket/class racket/draw slideshow/pict))
@defclass/title[radial-gradient% object% ()]{
@ -33,18 +33,29 @@ circles, where @racket[0.0] corresponds to the starting circle,
@racket[1.0] corresponds to the ending circle, and numbers in between
correspond to circles in between.
@examples[
@examples[
#:eval class-eval
(new radial-gradient%
[x0 0] [y0 100] [r0 10] [x1 300] [y1 100] [r1 100]
(define no-pen (make-object pen% "BLACK" 1 'transparent))
(define brush-grad (new brush% [gradient (new radial-gradient%
[x0 400] [y0 150] [r0 10] [x1 400] [y1 150] [r1 100]
[stops
(list (list 0 (make-object color% 0 0 255))
(list 0.5 (make-object color% 0 255 0))
(list 1 (make-object color% 255 0 0)))])
(make-object radial-gradient% 150 150 0 150 150 100
(list (list 0 (make-object color% 0 0 255))
(list 0.5 (make-object color% 0 255 0))
(list 1 (make-object color% 255 0 0))))
(list (list 0 (make-object color% 255 0 0))
(list 0.5 (make-object color% 0 255 0))
(list 1 (make-object color% 0 0 255)))])]))
(define brush-grad2 (new brush% [gradient
(make-object radial-gradient% 150 150 0 150 150 100
(list (list 0 (make-object color% 0 0 255))
(list 0.5 (make-object color% 0 255 0))
(list 1 (make-object color% 255 0 0))))]))
(dc (lambda (dc x y)
(send dc set-pen no-pen)
(send dc set-brush brush-grad2)
(send dc draw-ellipse 50 50 200 200)
(send dc set-brush brush-grad)
(send dc draw-rectangle 300 50 200 200)) 550 300)
]}
@defmethod[(get-circles)
@ -62,4 +73,5 @@ Returns the gradient's list of color stops.
}}
@(close-eval class-eval)