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;;; svg.el --- SVG image creation functions -*- lexical-binding: t -*-
;; Copyright (C) 2016-2018 Free Software Foundation, Inc.
;; Author: Lars Magne Ingebrigtsen <larsi@gnus.org>
;; Keywords: image
;; This file is part of GNU Emacs.
;; GNU Emacs is free software: you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.
;; GNU Emacs is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs. If not, see <https://www.gnu.org/licenses/>.
;;; Commentary:
;;; Code:
(require 'cl-lib)
(require 'xml)
(require 'dom)
(eval-when-compile (require 'subr-x))
(defun svg-create (width height &rest args)
"Create a new, empty SVG image with dimensions WIDTHxHEIGHT.
ARGS can be used to provide `stroke' and `stroke-width' parameters to
any further elements added."
(dom-node 'svg
`((width . ,width)
(height . ,height)
(version . "1.1")
(xmlns . "http://www.w3.org/2000/svg")
,@(svg--arguments nil args))))
(defun svg-gradient (svg id type stops)
"Add a gradient with ID to SVG.
TYPE is `linear' or `radial'. STOPS is a list of percentage/color
pairs."
(svg--def
svg
(apply
'dom-node
(if (eq type 'linear)
'linearGradient
'radialGradient)
`((id . ,id)
(x1 . 0)
(x2 . 0)
(y1 . 0)
(y2 . 1))
(mapcar
(lambda (stop)
(dom-node 'stop `((offset . ,(format "%s%%" (car stop)))
(stop-color . ,(cdr stop)))))
stops))))
(defun svg-rectangle (svg x y width height &rest args)
"Create a rectangle on SVG, starting at position X/Y, of WIDTH/HEIGHT.
ARGS is a plist of modifiers. Possible values are
:stroke-width PIXELS. The line width.
:stroke-color COLOR. The line color.
:gradient ID. The gradient ID to use."
(svg--append
svg
(dom-node 'rect
`((width . ,width)
(height . ,height)
(x . ,x)
(y . ,y)
,@(svg--arguments svg args)))))
(defun svg-circle (svg x y radius &rest args)
"Create a circle of RADIUS on SVG.
X/Y denote the center of the circle."
(svg--append
svg
(dom-node 'circle
`((cx . ,x)
(cy . ,y)
(r . ,radius)
,@(svg--arguments svg args)))))
(defun svg-ellipse (svg x y x-radius y-radius &rest args)
"Create an ellipse of X-RADIUS/Y-RADIUS on SVG.
X/Y denote the center of the ellipse."
(svg--append
svg
(dom-node 'ellipse
`((cx . ,x)
(cy . ,y)
(rx . ,x-radius)
(ry . ,y-radius)
,@(svg--arguments svg args)))))
(defun svg-line (svg x1 y1 x2 y2 &rest args)
"Create a line of starting in X1/Y1, ending at X2/Y2 in SVG."
(svg--append
svg
(dom-node 'line
`((x1 . ,x1)
(x2 . ,x2)
(y1 . ,y1)
(y2 . ,y2)
,@(svg--arguments svg args)))))
(defun svg-polyline (svg points &rest args)
"Create a polyline going through POINTS on SVG.
POINTS is a list of x/y pairs."
(svg--append
svg
(dom-node
'polyline
`((points . ,(mapconcat (lambda (pair)
(format "%s %s" (car pair) (cdr pair)))
points
", "))
,@(svg--arguments svg args)))))
(defun svg-polygon (svg points &rest args)
"Create a polygon going through POINTS on SVG.
POINTS is a list of x/y pairs."
(svg--append
svg
(dom-node
'polygon
`((points . ,(mapconcat (lambda (pair)
(format "%s %s" (car pair) (cdr pair)))
points
", "))
,@(svg--arguments svg args)))))
(defun svg-embed (svg image image-type datap &rest args)
"Insert IMAGE into the SVG structure.
IMAGE should be a file name if DATAP is nil, and a binary string
otherwise. IMAGE-TYPE should be a MIME image type, like
\"image/jpeg\" or the like."
(svg--append
svg
(dom-node
'image
`((xlink:href . ,(svg--image-data image image-type datap))
,@(svg--arguments svg args)))))
(defun svg-text (svg text &rest args)
"Add TEXT to SVG."
(svg--append
svg
(dom-node
'text
`(,@(svg--arguments svg args))
text)))
(defun svg--append (svg node)
(let ((old (and (dom-attr node 'id)
(dom-by-id svg
(concat "\\`" (regexp-quote (dom-attr node 'id))
"\\'")))))
(if old
(setcdr (car old) (cdr node))
(dom-append-child svg node)))
(svg-possibly-update-image svg))
(defun svg--image-data (image image-type datap)
(with-temp-buffer
(set-buffer-multibyte nil)
(if datap
(insert image)
(insert-file-contents image))
(base64-encode-region (point-min) (point-max) t)
(goto-char (point-min))
(insert "data:" image-type ";base64,")
(buffer-string)))
(defun svg--arguments (svg args)
(let ((stroke-width (or (plist-get args :stroke-width)
(dom-attr svg 'stroke-width)))
(stroke-color (or (plist-get args :stroke-color)
(dom-attr svg 'stroke-color)))
(fill-color (plist-get args :fill-color))
attr)
(when stroke-width
(push (cons 'stroke-width stroke-width) attr))
(when stroke-color
(push (cons 'stroke stroke-color) attr))
(when fill-color
(push (cons 'fill fill-color) attr))
(when (plist-get args :gradient)
(setq attr
(append
;; We need a way to specify the gradient direction here...
`((x1 . 0)
(x2 . 0)
(y1 . 0)
(y2 . 1)
(fill . ,(format "url(#%s)"
(plist-get args :gradient))))
attr)))
(cl-loop for (key value) on args by #'cddr
unless (memq key '(:stroke-color :stroke-width :gradient
:fill-color))
;; Drop the leading colon.
do (push (cons (intern (substring (symbol-name key) 1) obarray)
value)
attr))
attr))
(defun svg--def (svg def)
(dom-append-child
(or (dom-by-tag svg 'defs)
(let ((node (dom-node 'defs)))
(dom-add-child-before svg node)
node))
def)
svg)
(defun svg-image (svg &rest props)
"Return an image object from SVG.
PROPS is passed on to `create-image' as its PROPS list."
(apply
#'create-image
(with-temp-buffer
(svg-print svg)
(buffer-string))
'svg t props))
(defun svg-insert-image (svg)
"Insert SVG as an image at point.
If the SVG is later changed, the image will also be updated."
(let ((image (svg-image svg))
(marker (point-marker)))
(insert-image image)
(dom-set-attribute svg :image marker)))
(defun svg-possibly-update-image (svg)
(let ((marker (dom-attr svg :image)))
(when (and marker
(buffer-live-p (marker-buffer marker)))
(with-current-buffer (marker-buffer marker)
(put-text-property marker (1+ marker) 'display (svg-image svg))))))
(defun svg-print (dom)
"Convert DOM into a string containing the xml representation."
(if (stringp dom)
(insert dom)
(insert (format "<%s" (car dom)))
(dolist (attr (nth 1 dom))
;; Ignore attributes that start with a colon.
(unless (= (aref (format "%s" (car attr)) 0) ?:)
(insert (format " %s=\"%s\"" (car attr) (cdr attr)))))
(insert ">")
(dolist (elem (nthcdr 2 dom))
(insert " ")
(svg-print elem))
(insert (format "</%s>" (car dom)))))
(defun svg-remove (svg id)
"Remove the element identified by ID from SVG."
(when-let* ((node (car (dom-by-id
svg
(concat "\\`" (regexp-quote id)
"\\'")))))
(dom-remove-node svg node)))
(provide 'svg)
;;; svg.el ends here
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