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Add support for SVG path segment formats, document the path function #79

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5dc663b
Add support for SVG Q, S and T path segment formats
yuhan0 Oct 25, 2019
813e0ee
Document thi.ng.geom.svg.core/path function
yuhan0 Oct 25, 2019
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33 changes: 31 additions & 2 deletions src/thi/ng/geom/svg/core.cljc
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Original file line number Diff line number Diff line change
Expand Up @@ -52,15 +52,19 @@
(repeat n)
(interpose " "))))

;; TODO add missing path segment types (Q, T)

(def path-segment-formats
{:M ["M" *fmt-vec* " "]
:m ["m" *fmt-vec* " "]
:L ["L" *fmt-vec* " "]
:l ["l" *fmt-vec* " "]
:C ["C" *fmt-vec* " " *fmt-vec* " " *fmt-vec* " "]
:c ["c" *fmt-vec* " " *fmt-vec* " " *fmt-vec* " "]
:Q ["Q" *fmt-vec* " " *fmt-vec* " "]
:q ["q" *fmt-vec* " " *fmt-vec* " "]
:S ["S" *fmt-vec* " " *fmt-vec* " "]
:s ["s" *fmt-vec* " " *fmt-vec* " "]
:T ["T" *fmt-vec* " "]
:t ["t" *fmt-vec* " "]
:A ["A" *fmt-vec* " " *ff* " " str " " str " " *fmt-vec* " "]
:a ["a" *fmt-vec* " " *ff* " " str " " str " " *fmt-vec* " "]
:Z ["Z"]
Expand Down Expand Up @@ -189,6 +193,31 @@
(into [:g (svg-attribs attribs nil)] body))

(defn path
"Represents an SVG path element.
`segments` is a sequence of path segments, in the format
[<command> & args]
that corresponds to the SVG path language, eg.

(path [[:M [0 0]] [:l [20 30]] [:Z]]
{:fill \"red\"})

For reference, the available commands are as follows.
Each has an uppercase (absolute coordinates)
and lowercase (relative coordinates) variant.

| Command | Name | Arguments |
|---------+--------------------------+-------------------------------------------------------|
| M/m | moveto | [pt] |
| L/l | lineto | [pt] |
| H/h | horizontal lineto | [x] |
| V/v | vertical lineto | [y] |
| C/c | cubic curveto | [pt1 pt2 endpt] |
| S/s | smooth cubic curveto | [pt2 endpt] |
| Q/q | quadratic curveto | [pt1 endpt] |
| T/t | smooth quadratic curveto | [endpt] |
| A/a | elliptical arc | [rx ry x-axis-rotation large-arc-flag sweep-flag x y] |
| Z/z | closepath | [] |
"
([segments]
(path segments nil))
([segments attribs]
Expand Down