3 Usage
3.1 Basic steps to use simple-svg
1. use svg-out to define a canvas and a lambda to define all the things, at the end, output complete svg string.
2. all svg defines shoud be included in the lambda.
3. use svg-def-shape and new-* create a shape with basic properties.
4. use sstyle-new and set-SSTYLE-* define a new style.
5. if needed, use svg-def-group to combine a more complicated pattern.
6. use svg-place-widget to show a shape or a group at specific postion and style.
(svg-out (->* (positive? positive? procedure?) ( #:background (or/c #f string?) #:viewBox (or/c #f VIEW-BOX?) ) string? ))
specify width and height manully.
background: background color, if not null, will create a rectangle with this color on the bottom of canvas.
viewBox: use (new-view-box x y width height) to create a view-box, if needed.
(svg-def-shape (-> (or/c RECT? CIRCLE? ELLIPSE? LINE? POLYGON? POLYLINE? LINEAR-GRADIENT? RADIAL-GRADIENT? PATH? TEXT?) string?))
deinfe a shape, each shape has its create function.
(svg-def-group (-> procedure? void?))
all svg actions in procedure will be added to the group.
[svg-place-widget (->* (string?) ( #:style SSTYLE? #:at (cons/c (not/c negative?) (not/c negative?)) ) void?)]
specify a style and a postion, if no position, default to ’(0 . 0)
3.2 basic usage
define shape first, then reuse shape and style in group(s).
(svg-out 100 100 (lambda () (let ([rec_id (svg-def-shape (new-rect 100 100))] [_sstyle (sstyle-new)]) (set-SSTYLE-fill! _sstyle "#BBC42A") (svg-place-widget rec_id #:style _sstyle))))
3.3 background
create a rectangle as background, same as you create a rectrangle manully.
(svg-out 100 100 #:background "#BBC42A" (lambda () (let ([rec_id (svg-def-shape (new-rect 50 50))] [_sstyle (sstyle-new)]) (set-SSTYLE-fill! _sstyle "#FFFFFF") (svg-place-widget rec_id #:style _sstyle #:at '(25 . 25)))))
3.4 multiple shapes
(svg-out 150 150 (lambda () (let ( [blue_rec_id (svg-def-shape (new-rect 150 150))] [_blue_sstyle (sstyle-new)] [green_rec_id (svg-def-shape (new-rect 100 100))] [_green_sstyle (sstyle-new)] [red_rec_id (svg-def-shape (new-rect 50 50))] [_red_sstyle (sstyle-new)]) (set-SSTYLE-fill! _blue_sstyle "blue") (svg-place-widget blue_rec_id #:style _blue_sstyle) (set-SSTYLE-fill! _green_sstyle "green") (svg-place-widget green_rec_id #:style _green_sstyle #:at '(25 . 25)) (set-SSTYLE-fill! _red_sstyle "red") (svg-place-widget red_rec_id #:style _red_sstyle #:at '(50 . 50)))))
3.5 use group
(svg-out 220 280 (lambda () (let ( [line1_id (svg-def-shape (new-line '(0 . 0) '(30 . 30)))] [line2_id (svg-def-shape (new-line '(0 . 15) '(30 . 15)))] [line3_id (svg-def-shape (new-line '(15 . 0) '(15 . 30)))] [line4_id (svg-def-shape (new-line '(30 . 0) '(0 . 30)))] [_sstyle (sstyle-new)] [group_sstyle (sstyle-new)]) (set-SSTYLE-stroke-width! _sstyle 5) (set-SSTYLE-stroke! _sstyle "#765373") (let ([pattern_id (svg-def-group (lambda () (svg-place-widget line1_id #:style _sstyle #:at '(5 . 5)) (svg-place-widget line2_id #:style _sstyle #:at '(5 . 5)) (svg-place-widget line3_id #:style _sstyle #:at '(5 . 5)) (svg-place-widget line4_id #:style _sstyle #:at '(5 . 5))))]) (svg-place-widget pattern_id #:at '(50 . 50)) (svg-place-widget pattern_id #:at '(100 . 100)) (svg-place-widget pattern_id #:at '(80 . 200)) (svg-place-widget pattern_id #:at '(150 . 100))))))
