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sketch-mode.el
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sketch-mode.el
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;;; sketch-mode.el --- Quickly create svg sketches using keyboard and mouse -*- lexical-binding: t; -*-
;; Copyright (C) 2021 Free Software Foundation, Inc.
;; Author: D.L. Nicolai <dalanicolai@gmail.com>
;; Created: 17 Jul 2021
;; Version: 1.0.4
;; Keywords: multimedia
;; URL: https://github.com/dalanicolai/sketch-mode
;; This file is not part of GNU Emacs.
;; This program 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.
;; This program 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 this program. If not, see <https://www.gnu.org/licenses/>.
;;; Commentary:
;; DONE add functionality to toggle grid
;; DONE implement (simple) undo mechanism
;; TODO maybe transform relevant transient argument (strings) to variables ;; (af`add-object-modify-feature' branch)
;; TODO add functionality to start drawing from org-mode source block and update
;; source block after each draw/edit (showing the image as the block'ss output)
;; TODO maybe add keybindings (save/bind transient setting to specific 'mouse keys')
;; TODO add clipping fuctionality (see `svg-clip-path')
;; TODO create function to insert svg snippets (so you could design objects in
;; advanced software and use them quickly here in your sketches)
;; TODO create function to save snippets
;; TODO implement modularity. i.e. create 'layers' via svg groups <g> (related
;; to snippet functionality)
;; TODO create zoom functionality
;; NOTE this is a most straightforward sketch-mode. A more advanced/general version
;; could implement a drawing DSL based on nodes (a la tikz/asymptote etc.)
;;;; Code
(require 'svg)
(require 'shr-color)
(require 'sgml-mode)
(require 'org-element)
(eval-when-compile
(require 'evil-vars nil t))
(require 'undo-tree nil t)
(defvar sketch-svg nil)
(defvar sketch-size '(1200 . 900))
(defvar sketch-grid nil)
(defvar sketch-show-grid t)
(defvar sketch-background "white")
(defvar sketch-grid-param 100)
(defvar sketch-minor-grid-param nil)
(defvar sketch-minor-grid-freq 5)
(defvar sketch-grid-colors '("black" . "black"))
(defvar sketch-default-stroke "black")
(defvar sketch-snap-to-grid t)
(defvar sketch-canvas nil)
(defvar sketch-root nil)
(defvar sketch-action 'line)
(defvar sketch-stroke-color "Black")
(defvar sketch-fill-color "none")
(defvar sketch-opacity nil)
(defvar sketch-stroke-width 1)
(defvar sketch-stroke-dasharray nil)
(defvar sketch-font nil)
(defvar sketch-font-size 20)
(defvar sketch-font-weight "normal")
(defvar sketch-slider nil)
(defvar sketch-bboxes nil)
(defvar sketch-selection nil)
(defvar sketch-active-layer 0)
(defvar sketch-layers-list nil)
(defvar show-layers nil)
(defvar sketch-show-labels nil)
(defvar sketch-label-size 15)
(defvar sketch-call-buffer nil)
(defvar sketch-snippet nil)
(defvar sketch-lisp-buffer-name nil)
(defvar sketch-side-window-max-width (lambda () (- 1 (/ (float (car
(image-size
(get-text-property (point-min) 'display) t)))
(frame-pixel-width)))))
(defvar sketch-im-x-offset nil)
(defvar sketch-cursor-position "")
(defvar sketch-show-coords nil)
(defvar sketch-coordless-mode-line-format nil)
(declare-function evil-redo "evil-commands" ())
(declare-function evil-undo "evil-commands" ())
(declare-function undo-tree-redo "undo-tree" ())
(declare-function undo-tree-undo "undo-tree" ())
;;; Temporary code
;; Overwrite default function until patch in
;; https://debbugs.gnu.org/cgi/bugreport.cgi?bug=51371 to core is applied
(defun list-colors-display (&optional list buffer-name callback)
"Display names of defined colors, and show what they look like.
If the optional argument LIST is non-nil, it should be a list of
colors to display. Otherwise, this command computes a list of
colors that the current display can handle. Customize
`list-colors-sort' to change the order in which colors are shown.
Type \\<help-mode-map>\\[revert-buffer] after customizing \
`list-colors-sort' to redisplay colors in the new order.
If the optional argument BUFFER-NAME is nil, it defaults to \"*Colors*\".
If the optional argument CALLBACK is non-nil, it should be a
function to call each time the user types RET or clicks on a
color. The function should accept a single argument, the color name."
(interactive)
(when (> (display-color-cells) 0)
(setq list (list-colors-duplicates (or list (defined-colors))))
(when list-colors-sort
;; Schwartzian transform with `(color key1 key2 key3 ...)'.
(setq list (mapcar
'car
(sort (delq nil (mapcar
(lambda (c)
(let ((key (list-colors-sort-key
(car c))))
(when key
(cons c (if (consp key) key
(list key))))))
list))
(lambda (a b)
(let* ((a-keys (cdr a))
(b-keys (cdr b))
(a-key (car a-keys))
(b-key (car b-keys)))
;; Skip common keys at the beginning of key lists.
(while (and a-key b-key (equal a-key b-key))
(setq a-keys (cdr a-keys) a-key (car a-keys)
b-keys (cdr b-keys) b-key (car b-keys)))
(cond
((and (numberp a-key) (numberp b-key))
(< a-key b-key))
((and (stringp a-key) (stringp b-key))
(string< a-key b-key)))))))))
(when (memq (display-visual-class) '(gray-scale pseudo-color direct-color))
;; Don't show more than what the display can handle.
(let ((lc (nthcdr (1- (display-color-cells)) list)))
(if lc
(setcdr lc nil)))))
(unless buffer-name
(setq buffer-name "*Colors*"))
(with-help-window buffer-name
(with-current-buffer standard-output
(erase-buffer)
(list-colors-print list callback)
(set-buffer-modified-p nil)
(setq truncate-lines t)
(setq-local list-colors-callback callback)
(setq revert-buffer-function 'list-colors-redisplay)))
(when callback
(pop-to-buffer buffer-name)
(message "Click on a color to select it.")))
;;; Rendering
;;; Some snippets for svg.el
(defun svg-marker (svg id width height &optional color reverse)
"Define a marker with ID to SVG.
TYPE is `linear' or `radial'.
STOPS is a list of percentage/color pairs."
(svg--def
svg
(apply
#'dom-node
'marker
`((id . ,id)
(viewBox . "0 0 10 10")
(refX . 5)
(refY . 5)
,(pcase id
("arrow" `(markerWidth . ,width))
("dot" `(markerWidth . ,width)))
,(pcase id
("arrow" `(markerHeight . ,height))
("dot" `(markerHeight . ,height)))
,(pcase id
;; ("arrow" '(orient . auto-start-reverse))))
("arrow" (if reverse
'(orient . auto)
'(orient . auto-start-reverse)))))
(pcase id
("arrow" (list (dom-node 'path `((d . "M 0 0 L 10 5 L 0 10 z")
(fill . ,(or color "black"))))))
("dot" (list (dom-node 'circle `((cx . 5)
(cy . 5)
(r . 5)
(fill . ,(or color "black"))))))))))
(defun svg-group (&rest args)
(apply #'dom-node
'g
`(,(svg--arguments nil args))))
(defun sketch-group (id &rest args)
(apply #'svg-group
:id id
:transform "translate(0,0)"
args))
(defun sketch-create (w h &optional scale pan-x pan-y &rest args)
(let ((scale (or scale 1)))
(apply #'svg-create w h
:viewBox (format "%s %s %s %s"
(or pan-x 0)
(or pan-y 0)
(/ (float w) scale)
(/ (float h) scale))
args)))
(defun sketch-image (svg &rest props)
"Return an image object-label from SVG.
PROPS is passed on to `create-image' as its PROPS list."
(apply
#'create-image
(with-temp-buffer
(insert "<?xml version=\"1.0\" encoding=\"UTF-8\"?>
<!DOCTYPE svg PUBLIC \"-//W3C//DTD SVG 1.1//EN\" \"http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd\">\n")
(svg-print svg)
(buffer-string))
'svg t props))
(defun sketch-insert-image (svg &optional string &rest props)
"Insert SVG as an image at point.
If the SVG is later changed, the image will also be updated."
(let ((image (apply #'sketch-image svg props))
(marker (point-marker)))
(insert-image image string)
(dom-set-attribute svg :image marker)))
(defun sketch-add-layer ()
(interactive)
(let ((new-layer (length sketch-layers-list)))
(setq sketch-layers-list (append
sketch-layers-list
(list (sketch-group
(format "layer-%s" new-layer)))))
(setq sketch-active-layer new-layer)
(setq show-layers (append show-layers (list new-layer)))
(message "Existing layers (indices): %s"
(mapconcat #'number-to-string
(number-sequence 0 (1- (length sketch-layers-list)))
", "))))
(defun sketch-labels ()
"Create svg-group with svg text nodes for all elements in layer.
If value of variable ‘sketch-show-labels' is ‘layer', create ..."
(interactive)
(let ((nodes (pcase sketch-show-labels
("layer" (dom-children (nth sketch-active-layer sketch-layers-list)))
("all" (apply #'append (mapcar (lambda (l)
(dom-children (nth l sketch-layers-list)))
show-layers)))))
(svg-labels (sketch-group "labels")))
(defun sketch-label-text-node (node x y &rest props)
(apply #'svg-text
svg-labels
(dom-attr node 'id)
(append (list :x x
:y y
:font-size sketch-label-size
:stroke "red"
:fill "red")
(when-let (x (dom-attr node 'transform))
(list :transform x))
props)))
(with-no-warnings
(mapc (lambda (node)
(pcase (dom-tag node)
('rect (sketch-label-text-node
node
(+ (dom-attr node 'x) 2)
(+ (dom-attr node 'y)
(- (dom-attr node 'height) 2))))
('line (sketch-label-text-node
node
(dom-attr node 'x1)
(dom-attr node 'y1)))
((or 'circle 'ellipse)
(sketch-label-text-node
node
(dom-attr node 'cx)
(dom-attr node 'cy)))
((or 'polyline 'polygon)
(let ((coords (split-string
(car (split-string (dom-attr node 'points) ","))
nil
t)))
(sketch-label-text-node
node
(string-to-number (car coords))
(string-to-number (cadr coords)))))
('text (sketch-label-text-node
node
(dom-attr node 'x)
(+ (dom-attr node 'y)
sketch-label-size)))
('g (let ((s (dom-attr node
'transform)))
(string-match "translate\(\\([0-9]*\\)[, ]*\\([0-9]*\\)" s)
(let ((x (match-string 1 s))
(y (match-string 2 s)))
(sketch-label-text-node
node
x
y))))
))
nodes))
svg-labels))
(defun sketch-selections ()
(let* ((selections (sketch-group "Selections"))
(bbox (sketch-bbox-ex-transform (car (dom-by-id sketch-root (car sketch-selection)))))
(start-coords (cons (nth 0 bbox) (nth 1 bbox)))
(end-coords (cons (nth 2 bbox) (nth 3 bbox))))
(apply #'svg-rectangle selections `(,@(sketch--rectangle-coords start-coords end-coords)))
selections))
(defun sketch-labels-list ()
(apply #'append
(mapcar (lambda (l)
(mapcar (lambda (node)
(dom-attr node 'id))
(dom-children (nth l sketch-layers-list))))
show-layers)))
(defun sketch-create-label (type)
(interactive)
(let* ((prefix (concat (when (/= sketch-active-layer 0)
(number-to-string sketch-active-layer))
(pcase type
('line "l")
('rectangle "r")
('circle "c")
('ellipse "e")
('polyline "p")
('polygon "g")
('freehand "f")
('text "t")
('group "g")
('snippet "s"))))
(idx 0)
(label (concat prefix (number-to-string idx)))
(labels (sketch-labels-list)))
(while (member label labels)
(setq idx (1+ idx))
(setq label (concat prefix (number-to-string idx))))
label))
(defun sketch--create-canvas (width height)
(setq sketch-canvas (sketch-create width height nil nil nil))
(apply #'svg-rectangle sketch-canvas 0 0 "100%" "100%"
:id "bg"
(when (or sketch-show-grid sketch-background)
(list :fill
(if sketch-show-grid
"url(#grid)"
sketch-background)
)))) ; sketch-background)
(defun sketch-create-grid (&optional grid-param minor-grid-freq)
(setq sketch-grid-param (or grid-param sketch-grid-param))
(setq sketch-minor-grid-param (/ (float grid-param) (or minor-grid-freq 4)))
(setq sketch-grid (cons
;; major-grid
(dom-node 'pattern
`((id . "grid")
(width . ,grid-param)
(height . ,grid-param)
(patternUnits . "userSpaceOnUse"))
(dom-node 'rect `((width . ,grid-param) (height . ,grid-param)
(x . 0) (y . 0)
(stroke-width . 0.4) (stroke . ,(car sketch-grid-colors))
(fill . "url(#minorGrid)"))))
;; minor grid
(dom-node 'pattern
`((id . "minorGrid")
(width . ,sketch-minor-grid-param)
(height . ,sketch-minor-grid-param)
(patternUnits . "userSpaceOnUse"))
(dom-node 'rect `((width . ,sketch-minor-grid-param) (height . ,sketch-minor-grid-param)
(x . 0) (y . 0)
(stroke-width . 0.2) (stroke . ,(cdr sketch-grid-colors))
,(when sketch-background
`(fill . ,sketch-background))))))))
(defun sketch-maybe-update-modeline ()
(when sketch-show-coords
(force-mode-line-update)))
(defun sketch-draw-insert-image ()
(sketch-insert-image sketch-svg
(prin1-to-string sketch-root)
:map `(((rect . ((0 . 0) . (,(dom-attr sketch-svg 'width) . ,(dom-attr sketch-svg 'height))))
;; :map '(((rect . ((0 . 0) . (800 . 600)))
sketch
,(append '(pointer
arrow)
(when sketch-show-coords
(list 'help-echo (lambda (_ _ _)
(let ((coords (cdr (mouse-pixel-position))))
(setq sketch-cursor-position
(format "(%s, %s)"
(- (car coords) sketch-im-x-offset)
(cdr coords))))
;; (+ (cdr coords) sketch-im-y-offset))))
(force-mode-line-update)))))))))
(defun sketch-update-insert-image ()
(sketch-insert-image sketch-svg
nil
;; :pointer 'arrow
:map `(((rect . ((0 . 0) . (,(dom-attr sketch-svg 'width) . ,(dom-attr sketch-svg 'height))))
;; :map '(((rect . ((0 . 0) . (800 . 600)))
sketch
(pointer arrow))))
(backward-char))
(defun sketch-object-preview-update (object-type node start-coords end-coords &optional start-node)
(pcase-let ((`(,x1 . ,y1) start-coords)
(`(,x2 . ,y2) end-coords))
(pcase object-type
('line
(setf (dom-attr node 'x2) x2)
(setf (dom-attr node 'y2) y2))
('rectangle
(pcase-let ((`(,x ,y ,w ,h) (sketch--rectangle-coords start-coords end-coords)))
(setf (dom-attr node 'x) x)
(setf (dom-attr node 'y) y)
(setf (dom-attr node 'width) w)
(setf (dom-attr node 'height) h)))
('circle
(setf (dom-attr node 'r) (sketch--circle-radius start-coords end-coords)))
('ellipse
(pcase-let ((`(,cx ,cy ,rx ,ry) (sketch--ellipse-coords start-coords end-coords)))
(setf (dom-attr node 'cx) cx)
(setf (dom-attr node 'cy) cy)
(setf (dom-attr node 'rx) rx)
(setf (dom-attr node 'ry) ry)))
('translate
(message "deze %s" start-node)
(let ((dx (- x2 x1))
(dy (- y2 y1)))
(sketch--svg-move dx dy node start-node))))))
(defun sketch-redraw (&optional lisp lisp-buffer update)
;; (unless sketch-mode
;; (user-error "Not in sketch-mode buffer"))
;; (save-current-buffer
(when lisp-buffer
(sketch-update-lisp-window lisp lisp-buffer))
;; (let ((lisp-window (or (get-buffer-window "*sketch-root*")
;; (get-buffer-window lisp-buffer))))
;; (unless (string= (buffer-name (window-buffer lisp-window)) "*sketch*")
;; (if-let (buf (get-buffer"*sketch-root*"))
;; (sketch-update-lisp-window sketch-root buf)
;; (sketch-update-lisp-window lisp lisp-buffer))))
(setq sketch-root (append (cl-subseq sketch-root 0 2) (list (nth (car show-layers) sketch-layers-list))))
(dolist (layer (cdr show-layers))
(setq sketch-root (append sketch-root (list (nth layer sketch-layers-list)))))
(setq sketch-svg (append sketch-canvas
(list sketch-root)
(when sketch-show-labels (list (sketch-labels)))
(when sketch-selection (list (sketch-selections)))))
(svg--def sketch-svg
'(style ((type . "text/css")) "<![CDATA[#Selections
{ stroke: DeepSkyBlue; stroke-width: 2; fill: none; stroke-dasharray: 8 8; }]]>"))
(when sketch-show-grid
(svg--def sketch-svg (cdr sketch-grid))
(svg--def sketch-svg (car sketch-grid)))
(with-current-buffer "*sketch*"
(let ((inhibit-read-only t))
(erase-buffer) ;; a (not exact) alternative is to use (kill-backward-chars 1)
(if update
(sketch-update-insert-image)
(sketch-draw-insert-image))
(goto-char (point-min)))))
(define-key image-map "o" nil)
(defvar sketch-mode-map
(let ((map (make-sparse-keymap))
(bindings `(([sketch down-mouse-1] . sketch-interactively)
([sketch mouse-3] . sketch-text-interactively)
([sketch C-S-drag-mouse-1] . sketch-crop)
([sketch S-down-mouse-1] . sketch-select)
([sketch S-down-mouse-1] . sketch-select)
([sketch triple-mouse-4] . sketch-rotate-by-5)
([sketch triple-mouse-5] . sketch-rotate-by-min-5)
("a" . sketch-set-action)
("cs" . sketch-set-colors)
("cf" . sketch-set-fill-color)
("w" . sketch-set-width)
("sd" . sketch-set-dasharray)
("fw" . sketch-set-font-with-keyboard)
("fs" . sketch-set-font-size-by-keyboard)
("fc" . sketch-set-font-color)
("v" . sketch-keyboard-select)
("m" . sketch-modify-object)
("d" . sketch-remove-object)
("tg" . sketch-toggle-grid)
("ts" . sketch-toggle-snap)
("tt" . sketch-toggle-toolbar)
("." . sketch-toggle-key-hints)
("tc" . sketch-toggle-coords)
("l" . sketch-cycle-labels)
("D" . sketch-show-definition)
("X" . sketch-show-xml)
("u" . sketch-undo)
("U" . sketch-redo)
("S" . image-save)
(,(kbd "C-c C-c") . sketch-quick-insert-image)
("?" . sketch-help)
("Q" . sketch-quit))))
(dolist (b bindings)
(define-key map (car b) (cdr b)))
map))
(define-derived-mode sketch-mode special-mode "sketch-mode"
"Create svg images using the mouse.
In sketch-mode buffer press \\[sketch-transient] to activate the
transient."
;; :lighter "sketch-mode"
;; :keymap
;; `(
;; ([sketch down-mouse-1] . sketch-interactively)
;; ([sketch mouse-3] . sketch-text-interactively)
;; ([sketch C-S-drag-mouse-1] . sketch-crop)
;; ([sketch S-down-mouse-1] . sketch-select)
;; ("a" . sketch-set-action)
;; ("c" . sketch-set-colors)
;; ("w" . sketch-set-width)
;; ("sd" . sketch-set-dasharray)
;; ("fw" . sketch-set-font-with-keyboard)
;; ("fs" . sketch-set-font-size-by-keyboard)
;; ("fc" . sketch-set-font-color)
;; ("v" . sketch-keyboard-select)
;; ("m" . sketch-modify-object)
;; ("d" . sketch-remove-object)
;; ("tg" . sketch-toggle-grid)
;; ("ts" . sketch-toggle-snap)
;; ("tt" . sketch-toggle-toolbar)
;; ("." . sketch-toggle-key-hints)
;; ("tc" . sketch-toggle-coords)
;; ("l" . sketch-cycle-labels)
;; ("D" . sketch-show-definition)
;; ("u" . sketch-undo)
;; ("U" . sketch-redo)
;; ("S" . image-save)
;; (,(kbd "C-c C-c") . sketch-quick-insert-image)
;; ("?" . sketch-help)
;; ("Q" . sketch-quit))
;; (,(kbd "C-c C-s") . sketch-transient))
(with-no-warnings
(if (boundp 'undo-tree-mode)
(undo-tree-mode))
(buffer-enable-undo))
(setq-local global-hl-line-mode nil)
(blink-cursor-mode 0))
(defun sketch-quit-side-windows ()
"Quit sketch window. The window can be restores with ‘M-x sketch'"
(when (eq major-mode 'sketch-mode)
(when (get-buffer "*sketch-toolbar*")
(kill-buffer "*sketch-toolbar*"))
(when (get-buffer "*sketch-key-hints*")
(kill-buffer "*sketch-key-hints*"))))
(add-hook 'quit-window-hook 'sketch-quit-side-windows)
;; TODO format/propertize key hints
(defun sketch-toggle-key-hints (&optional show)
"Toggle key-hints, when SHOW non-nil then show key-hints."
(interactive)
(let ((win (get-buffer-window "*sketch-key-hints*")))
(if win
(unless show (delete-window win))
(let* ((window-sides-vertical t)
(buffer (get-buffer-create "*sketch-key-hints*"))
(win (display-buffer-in-side-window (get-buffer-create "*sketch-key-hints*")
`((side . bottom)
(slot . -1)
(window-height . 11)))))
(set-window-dedicated-p win t)
(set-window-parameter win 'no-other-window t)
(with-current-buffer buffer
(insert
"Stroke/Fill Font Edit Toggle Definition
-------------------------------------------------------------------------------------------------------------------------------
[a] : action [fw]: font [m] : modify object [tg]: grid [D] : Show definition
[cs]: stroke-color [fs]: font-size [v] : select [ts]: snap [X] : Show xml
[cf]: fill-color [fc]: font-color [d] : delete [tt]: toolbar [C-c C-c]: Quick insert to call buffer
[w] : width [u/U]: undo/redo [tc]: coords
[sd]: dasharray
[down-mouse-1] main action, [down-mouse-3] add text ,[C-S drag-mouse-1] crop image, [sketch triple-mouse-4/5] rotate selection")
(setq cursor-type nil)
(special-mode))))))
(defun sketch-kill-key-hints ()
(let ((key-hints (get-buffer "*sketch-key-hints*")))
(when key-hints
(kill-buffer key-hints))))
;;;###autoload
(defun sketch (arg)
"Initialize or switch to (new) SVG image.
With prefix ARG, create sketch using default (customizable)
values"
(interactive "P")
(let ((buffer (get-buffer "*sketch*")))
(cond (buffer
(switch-to-buffer buffer)
;; TODO maybe immprove, i.e. always show on visit
(sketch-toggle-toolbar t)
(sketch-toggle-key-hints t)
)
(t
(let ((call-buffer (current-buffer))
(width (if arg (car sketch-size) (read-number "Enter width: ") ))
(height (if arg (cdr sketch-size) (read-number "Enter height: "))))
(switch-to-buffer (get-buffer-create "*sketch*"))
(setq sketch-action 'line)
(setq sketch-grid-param (if arg sketch-grid-param (read-number "Enter grid parameter (enter 0 for no grid): ")))
(sketch--init width height sketch-grid-param)
(when sketch-show-coords
(setq sketch-coordless-mode-line-format mode-line-format)
(add-to-list 'mode-line-format '(:eval sketch-cursor-position) t))
(setq sketch-call-buffer call-buffer)))))) ;; variable is buffer local))
(defun sketch--init (width height &optional grid-param minor-grid-freq)
(setq sketch-grid-param (or grid-param sketch-grid-param))
(setq sketch-minor-grid-freq (or minor-grid-freq sketch-minor-grid-freq))
;; (when sketch-background
;; (unless (memq "none" (list sketch-start-marker sketch-mid-marker sketch-end-marker))
;; (svg-marker sketch-canvas "arrow" 8 8 "black" t))
(sketch--create-canvas width height)
(setq sketch-svg (seq-copy sketch-canvas))
(when sketch-show-grid
(sketch-create-grid grid-param)
(svg--def sketch-svg (cdr sketch-grid))
(svg--def sketch-svg (car sketch-grid)))
(setq sketch-root (sketch-group "root"))
(setq sketch-layers-list (list (sketch-group "layer-0")))
(setq show-layers '(0))
(sketch-draw-insert-image)
(goto-char (point-min)) ; cursor over image looks better
(setq sketch-im-x-offset (car (window-absolute-pixel-position)))
(sketch-toggle-toolbar)
(sketch-toggle-key-hints)
(add-hook 'kill-buffer-hook 'sketch-kill-toolbar nil t)
(add-hook 'kill-buffer-hook 'sketch-kill-key-hints nil t)
(special-mode)
(sketch-mode))
(defun sketch-quit ()
"Quit sketch-mode and kill buffers."
(interactive)
(when (get-buffer "*sketch-toolbar*")
(kill-buffer "*sketch-toolbar*"))
(kill-buffer "*sketch*"))
;;; Actions
(defun sketch-norm (vec)
"Return norm of a vector (list of numbers).
VEC should be a cons or a list containing only number elements."
(let ((sum-of-squares (apply #'+
(mapcar (lambda (x) (expt x 2))
vec))))
(expt sum-of-squares 0.5)))
(defun sketch--circle-radius (start-coords end-coords)
(sketch-norm
(list (- (car end-coords) (car start-coords))
(- (cdr end-coords) (cdr start-coords)))))
(defun sketch--rectangle-coords (start-coords end-coords)
(let ((base-coords (cons (apply #'min (list (car start-coords) (car end-coords)))
(apply #'min (list (cdr start-coords) (cdr end-coords))))))
(list (car base-coords)
(cdr base-coords)
(abs (- (car end-coords) (car start-coords)))
(abs (- (cdr end-coords) (cdr start-coords))))))
(defun sketch--ellipse-coords (start-coords end-coords)
(list (/ (+ (car start-coords) (car end-coords)) 2)
(/ (+ (cdr start-coords) (cdr end-coords)) 2)
(abs (/ (- (car end-coords) (car start-coords)) 2))
(abs (/ (- (cdr end-coords) (cdr start-coords)) 2))))
(defun sketch--snap-to-grid (coord grid-param)
(cons (* (round (/ (float (car coord)) grid-param)) grid-param)
(* (round (/ (float (cdr coord)) grid-param)) grid-param)))
(defun sketch-interactively (event)
"Draw objects interactively via a mouse drag EVENT. "
(interactive "@e")
(let* ((start (event-start event))
(start-coords (if sketch-snap-to-grid
(sketch--snap-to-grid (posn-object-x-y start) sketch-minor-grid-param)
(posn-object-x-y start)))
(points (list (cons (car start-coords) (cdr start-coords)))) ;; list of point needed for polyline/gon
(object-props (if (eq sketch-action 'text)
(append (list :font-size sketch-font-size
:font-weight sketch-font-weight)
(when sketch-font
(list :font-family sketch-font))
(when sketch-stroke-color
(list :stroke sketch-stroke-color))
(when sketch-fill-color
(list :fill sketch-fill-color))
(when sketch-opacity
(list :opacity sketch-opacity)))
(append (list :stroke-width
sketch-stroke-width
:stroke
sketch-stroke-color
:fill
sketch-fill-color
:stroke-dasharray
sketch-stroke-dasharray)
(when sketch-opacity
(list :opacity sketch-opacity))
;; :marker-end (if args (pcase (transient-arg-value "--marker=" args)
;; ("arrow" "url(#arrow)")
;; ("dot" "url(#dot)")
;; (_ "none"))
;; (if sketch-include-end-marker
;; "url(#arrow)"
;; "none"))
)))
(start-command-and-coords (pcase sketch-action
('line (list 'svg-line
(car start-coords) (cdr start-coords)
(car start-coords) (cdr start-coords)))
('rectangle `(svg-rectangle
,@(sketch--rectangle-coords start-coords start-coords)))
('circle (list 'svg-circle
(car start-coords) (cdr start-coords)
(sketch--circle-radius start-coords start-coords)))
('ellipse `(svg-ellipse ,@(sketch--ellipse-coords start-coords start-coords)))
((or 'polyline 'polygon 'freehand)
(list (pcase sketch-action
((or 'polyline 'freehand) 'svg-polyline)
('polygon 'svg-polygon))
points))))
(label (unless (memq sketch-action '(select move translate))
(sketch-create-label sketch-action))))
(pcase sketch-action
('text (let ((text (read-string "Enter text: ")))
(apply #'svg-text
(nth sketch-active-layer sketch-layers-list)
text
:x (car start-coords)
:y (cdr start-coords)
:id label object-props)))
(_ (unless (memq sketch-action '(select move translate))
(apply (car start-command-and-coords)
(nth sketch-active-layer sketch-layers-list)
`(,@(cdr start-command-and-coords) ,@object-props :id ,label)))
(let* ((node (unless (eq sketch-action 'select)
(car (dom-by-id (nth sketch-active-layer sketch-layers-list)
(if (memq sketch-action '(move translate))
(car sketch-selection)
label)))))
(translate-start (dom-attr node 'transform)))
(track-mouse
(pcase sketch-action
((or 'line 'rectangle 'circle 'ellipse 'move 'translate)
(let ((event (read-event)))
(while (not (memq (car event) '(mouse-1 drag-mouse-1)))
(let* ((end (event-start event))
(end-coords (if sketch-snap-to-grid
(sketch--snap-to-grid (posn-object-x-y end) sketch-minor-grid-param)
(posn-object-x-y end))))
(sketch-object-preview-update sketch-action
node
start-coords
end-coords
(when (eq sketch-action 'translate)
translate-start))
(sketch-redraw nil nil t)
(when (and sketch-lisp-buffer-name (buffer-live-p (get-buffer sketch-lisp-buffer-name)))
(sketch-update-lisp-window node sketch-lisp-buffer-name))
(setq event (read-event))
(when sketch-show-coords
(setq sketch-cursor-position (format "(%s, %s)"
(car end-coords)
(cdr end-coords))))
(sketch-maybe-update-modeline)
))
(let* ((end (event-end event))
(end-coords (if sketch-snap-to-grid
(sketch--snap-to-grid (posn-object-x-y end) sketch-minor-grid-param)
(posn-object-x-y end))))
(if (and (equal (car start-coords) (car end-coords))
(equal (cdr start-coords) (cdr end-coords)))
(dom-remove-node (nth sketch-active-layer sketch-layers-list) node)
(sketch-object-preview-update sketch-action
node
start-coords
end-coords
(when (eq sketch-action 'translate)
translate-start))
(sketch-redraw nil nil t)
(when (and sketch-lisp-buffer-name (buffer-live-p (get-buffer sketch-lisp-buffer-name)))
(sketch-update-lisp-window node sketch-lisp-buffer-name))))))
((or 'polyline 'polygon)
(while (not (eq (car event) 'double-mouse-1))
(setq event (read-event))
(let* ((end (event-start event))
(end-coords (if sketch-snap-to-grid
(sketch--snap-to-grid (posn-object-x-y end) sketch-minor-grid-param)
(posn-object-x-y end))))
(let (message-log-max)
(message "Press double click to finish by inserting a final node"))
(setf (dom-attr node 'points) (mapconcat (lambda (pair)
(format "%s %s" (car pair) (cdr pair)))
(reverse
(if (eq (car event) 'down-mouse-1)
(push end-coords points)
(cons end-coords points)))
", "))
(sketch-redraw nil nil t)
(setq sketch-cursor-position (format "(%s, %s)"
(car end-coords)
(cdr end-coords)))
(sketch-maybe-update-modeline)))
(let* ((end (event-end event))
(end-coords (if sketch-snap-to-grid
(sketch--snap-to-grid (posn-object-x-y end) sketch-minor-grid-param)
(posn-object-x-y end))))
(setf (dom-attr node 'points) (mapconcat (lambda (pair)
(format "%s %s" (car pair) (cdr pair)))
(reverse
(if (eq (car event) 'down-mouse-1)
(push end-coords points)
(cons end-coords points)))
", "))))
('freehand
(while (not (memq (car event) '(mouse-1 drag-mouse-1)))
(setq event (read-event))
(let* ((end (if (eq (car event) 'drag-mouse-1)
(event-end event)
(event-start event)))
(end-coords (if sketch-snap-to-grid
(sketch--snap-to-grid (posn-object-x-y end) sketch-minor-grid-param)
(posn-object-x-y end))))
(setf (dom-attr node 'points) (mapconcat (lambda (pair)
(format "%s %s" (car pair) (cdr pair)))
(reverse (cl-pushnew end-coords points))
", "))
(sketch-redraw nil nil t)
(setq sketch-cursor-position (format "(%s, %s)"
(car end-coords)
(cdr end-coords)))
(sketch-maybe-update-modeline))))
('select (let* ((coords (posn-object-x-y (event-start event)))
(bboxes (seq-filter (lambda (x)
(sketch-within-bbox-ex-transform-p coords (cdr x)))
sketch-bboxes)))
(let ((next-selections (member (car sketch-selection) (mapcar #'car bboxes))))
(setq sketch-selection (if next-selections
(when-let (x (cadr next-selections)) (list x))
(when bboxes (list (caar bboxes)))))))))))))
(setq sketch-bboxes (mapcar (lambda (x)
(cons (dom-attr x 'id)
(sketch-bbox-ex-transform x)))
(dom-children (nth sketch-active-layer sketch-layers-list))))
(when-let (buf (get-buffer "*sketch-root*"))
(sketch-update-lisp-window sketch-root buf))
(sketch-redraw)))
(defun sketch-text-interactively (event)
(interactive "@e")
(let* ((start (event-start event))
(coords (if sketch-snap-to-grid
(posn-object-x-y start)
(sketch--snap-to-grid (posn-object-x-y start) sketch-grid-param)))
(text (read-string "Enter text: "))
(object-props (append (list :font-size sketch-font-size
:font-weight sketch-font-weight)
(when sketch-font
(list :font-family sketch-font))
(when sketch-stroke-color
(list :stroke sketch-stroke-color))
(when sketch-fill-color
(list :fill sketch-fill-color)))))
;; :fill
;; (transient-arg-value "--fill-color=" sketch-args)
;; :marker-end (if sketch-args (pcase (transient-arg-value "--marker=" sketch-args)
;; ("arrow" "url(#arrow)")
;; ("dot" "url(#dot)")
;; (_ "none"))
;; (if sketch-include-end-marker
;; "url(#arrow)"
;; "none"))))
(apply #'svg-text
(nth sketch-active-layer sketch-layers-list)
text
:x (car coords)
:y (cdr coords)
:id (sketch-create-label 'text)
object-props))
(sketch-redraw))
;;; Modify object-label
(defun sketch-keyboard-select (&optional all)
"Select labels to include in selection.
Initial input shows current selection. With prefix ARG initial
selection shows all object in sketch."
(interactive "P")
(setq sketch-selection (completing-read-multiple "Select labels for selection (separated by ,): "
(sketch-labels-list)
nil
t
(mapconcat #'identity
(if all
(sketch-labels-list)
sketch-selection)
","))))
(defun sketch-move-object (buffer object-def props coords amount)
(dolist (coord coords)
(cl-incf (alist-get coord props) amount))
(sketch-redraw object-def buffer))
(defun sketch-parse-transform-string (value)
"Parse SVG transform VALUE (string) to alist.
The elements of the alist cons-cell consisting of the
transform (symbol) and its values (list)."
(mapcar (lambda (p)
(cons (intern (car p))
(mapcar #'string-to-number (split-string (cadr p) "[, ]" t))))
(seq-partition (split-string value "[()\n]+" t " *") 2)))
(defun sketch-format-transform (transform-alist)
"Format TRANSFORM-ALIST to transform string.
The TRANSFORM-ALIST generally is a transform of the an alist
returned by the function `sketch-parse-transform-string'"
(mapconcat #'identity
(mapcar (lambda (c)
(format "%s(%s)"
(symbol-name (car c))
(mapconcat #'number-to-string (cdr c) " ")))
transform-alist)
"\n"))
(defun sketch-prop-vals (props &rest keys)
(mapcar (lambda (p) (alist-get p props)) keys))
(defun sketch-bbox-ex-transform (object)
(pcase object