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osm.el
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;;; osm.el --- OpenStreetMap viewer -*- lexical-binding: t -*-
;; Copyright (C) 2022-2025 Free Software Foundation, Inc.
;; Author: Daniel Mendler <[email protected]>
;; Maintainer: Daniel Mendler <[email protected]>
;; Created: 2022
;; Version: 1.6
;; Package-Requires: ((emacs "28.1") (compat "30"))
;; URL: https://github.com/minad/osm
;; Keywords: network, multimedia, hypermedia, mouse
;; This file is 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:
;; Osm.el is a tile-based map viewer, with a responsive movable and
;; zoomable display. The map can be controlled with the keyboard or with
;; the mouse. The viewer fetches the map tiles in parallel from tile
;; servers via the `curl' program. The package comes with a list of
;; multiple preconfigured tile servers. You can bookmark your favorite
;; locations using regular Emacs bookmarks or create links from Org files
;; to locations. Furthermore the package provides commands to measure
;; distances, search for locations by name and to open and display GPX
;; tracks.
;; osm.el requires Emacs 28 and depends on the external `curl' program.
;; Emacs must be built with libxml, libjansson, librsvg, libjpeg and
;; libpng support.
;;; Code:
(require 'compat)
(require 'bookmark)
(require 'dom)
(eval-when-compile
(require 'cl-lib)
(require 'subr-x))
(defgroup osm nil
"OpenStreetMap viewer."
:link '(info-link :tag "Info Manual" "(osm)")
:link '(url-link :tag "Website" "https://github.com/minad/osm")
:link '(url-link :tag "Wiki" "https://github.com/minad/osm/wiki")
:link '(emacs-library-link :tag "Library Source" "osm.el")
:group 'web
:prefix "osm-")
(defcustom osm-curl-options
"--disable --fail --location --silent --max-time 30"
"Curl command line options."
:type 'string)
(defcustom osm-search-language "en"
"Language used for search results.
Use RFC 1766 abbreviations, e.g.: `en' for English, `de' for German.
A comma-separated specifies descending order of preference. See also
`url-mime-language-string'."
:type 'string)
(defcustom osm-search-server
"https://nominatim.openstreetmap.org"
"Server used to search for location names.
The server must offer the nominatim.org API."
:type 'string)
(defcustom osm-server-defaults
'(:min-zoom 2
:max-zoom 19
:download-batch 4
:max-connections 2
:subdomains ("a" "b" "c"))
"Default server properties.
See also `osm-server-list'."
:type 'plist)
(defcustom osm-server-list
'((default
:name "Carto"
:description "Standard Carto map provided by OpenStreetMap"
:url "https://%s.tile.openstreetmap.org/%z/%x/%y.png"
:group "Standard"
:copyright ("Map data © {OpenStreetMap|https://www.openstreetmap.org/copyright} contributors"
"Map style © {OpenStreetMap Standard|https://www.openstreetmap.org/copyright}"))
(de
:name "Carto(de)"
:description "Localized Carto map provided by OpenStreetMap Germany"
:url "https://%s.tile.openstreetmap.de/%z/%x/%y.png"
:group "Standard"
:copyright ("Map data © {OpenStreetMap|https://www.openstreetmap.org/copyright} contributors"
"Map style © {OpenStreetMap Deutschland|https://www.openstreetmap.de/germanstyle.html}"))
(fr
:name "Carto(fr)"
:description "Localized Carto map by OpenStreetMap France"
:url "https://%s.tile.openstreetmap.fr/osmfr/%z/%x/%y.png"
:group "Standard"
:copyright ("Map data © {OpenStreetMap|https://www.openstreetmap.org/copyright} contributors"
"Map style © {OpenStreetMap France|https://www.openstreetmap.fr/mentions-legales/}"))
(humanitarian
:name "Humanitarian"
:description "Humanitarian map provided by OpenStreetMap France"
:url "https://%s.tile.openstreetmap.fr/hot/%z/%x/%y.png"
:group "Special Purpose"
:copyright ("Map data © {OpenStreetMap|https://www.openstreetmap.org/copyright} contributors"
"Map style © {Humanitarian OpenStreetMap Team|https://www.hotosm.org/updates/2013-09-29_a_new_window_on_openstreetmap_data}"))
(cyclosm
:name "CyclOSM"
:description "Bicycle-oriented map provided by OpenStreetMap France"
:url "https://%s.tile-cyclosm.openstreetmap.fr/cyclosm/%z/%x/%y.png"
:group "Transportation"
:copyright ("Map data © {OpenStreetMap|https://www.openstreetmap.org/copyright} contributors"
"Map style © {CyclOSM|https://www.cyclosm.org/} contributors"))
(openriverboatmap
:name "OpenRiverBoatMap"
:description "Waterways map provided by OpenStreetMap France"
:url "https://%s.tile.openstreetmap.fr/openriverboatmap/%z/%x/%y.png"
:group "Transportation"
:copyright ("Map data © {OpenStreetMap|https://www.openstreetmap.org/copyright} contributors"
"Map style © {OpenRiverBoatMap|https://github.com/tilery/OpenRiverboatMap}"))
(opentopomap
:name "OpenTopoMap"
:description "Topographical map provided by OpenTopoMap"
:url "https://%s.tile.opentopomap.org/%z/%x/%y.png"
:group "Topographical"
:copyright ("Map data © {OpenStreetMap|https://www.openstreetmap.org/copyright} contributors"
"Map style © {OpenTopoMap|https://www.opentopomap.org} ({CC-BY-SA|https://creativecommons.org/licenses/by-sa/3.0/})"
"Elevation data: {SRTM|https://www2.jpl.nasa.gov/srtm/}"))
(opvn
:name "ÖPNV" :max-zoom 18
:description "Base layer with public transport information"
:url "http://%s.tile.memomaps.de/tilegen/%z/%x/%y.png"
:group "Transportation"
:copyright ("Map data © {OpenStreetMap|https://www.openstreetmap.org/copyright} contributors"
"Map style © {ÖPNVKarte|https://www.öpnvkarte.de}")))
"List of tile servers.
Allowed keys:
:name Server name
:description Server description
:copyright Copyright information
:group Name of server groups for related servers
:url Url with placeholders
:ext File name extension
:min-zoom Minimum zoom level
:max-zoom Maximum zoom level
:download-batch Number of tiles downloaded via a single connection
:max-connections Maximum number of parallel connections
:subdomains Subdomains used for the %s placeholder
See also `osm-server-defaults' for default values used for a
server if the property is missing.
The :url of each server should specify %x, %y, %z and %s placeholders
for the map coordinates. It can optionally use an %s placeholder
for the subdomain and a %k placeholder for an apikey. The apikey
will be retrieved via `auth-source-search' with the :host set to
the domain name and the :user to the string \"apikey\"."
:type '(alist :key-type symbol :value-type plist))
(defcustom osm-copyright t
"Display the copyright information above the map."
:type 'boolean)
(defcustom osm-pin-colors
'((osm-selected . "#e20")
(osm-bookmark . "#f80")
(osm-home . "#80f")
(osm-track . "#00e")
(osm-gpx-poi . "#88f")
(osm-gpx-track . "#88f"))
"Colors of pins."
:type '(alist :key-type symbol :value-type string))
(defcustom osm-track-style
"stroke:#00a;stroke-width:5;stroke-linejoin:round;stroke-linecap:round;opacity:0.4;"
"SVG style used to draw tracks."
:type 'string)
(defcustom osm-home
(let ((lat (bound-and-true-p calendar-latitude))
(lon (bound-and-true-p calendar-longitude)))
(if (and lat lon)
(list lat lon 12)
(list 0 0 3)))
"Home coordinates, latitude, longitude and zoom level."
:type '(list :tag "Coordinates"
(number :tag "Latitude ")
(number :tag "Longitude ")
(number :tag "Zoom ")))
(defcustom osm-large-step 256
"Scroll step in pixel."
:type 'natnum)
(defcustom osm-tile-border nil
"Set to t to display thin tile borders.
For debugging set the value to `debug', such that a border is
shown around SVG tiles."
:type '(choice boolean (const debug)))
(defcustom osm-small-step 16
"Scroll step in pixel."
:type 'natnum)
(defcustom osm-server 'default
"Tile server name."
:type 'symbol)
(defcustom osm-tile-directory
(expand-file-name (file-name-concat
(or (getenv "XDG_CACHE_HOME") "~/.cache/")
"emacs/osm/"))
"Tile cache directory."
:type 'string)
(defcustom osm-max-age 14
"Maximum tile age in days.
Should be at least 7 days according to the server usage policies."
:type '(choice (const nil) natnum))
(defcustom osm-max-tiles 256
"Number of tiles to keep in the memory cache."
:type '(choice (const nil) natnum))
(defun osm--menu-item (menu)
"Generate menu item from MENU."
`(menu-item
"" nil :filter
,(lambda (&optional _)
(select-window
(posn-window
(event-start last-input-event)))
(if (functionp menu)
(funcall menu)
menu))))
(defun osm--mouse-ignore-wheel (_prompt)
"Ignore mouse wheel events during key translation."
(pcase (this-single-command-raw-keys)
((and `[,e]
(let y (event-basic-type e))
(guard (symbolp y))
(guard (string-search "wheel-" (symbol-name y))))
[])
(k k)))
(defvar-keymap osm-prefix-map
:doc "Global prefix map of OSM entry points."
"h" #'osm-home
"s" #'osm-search
"v" #'osm-server
"t" #'osm-goto
"j" #'osm-jump
"x" #'osm-gpx-show
"X" #'osm-gpx-hide)
;;;###autoload (autoload 'osm-prefix-map "osm" nil t 'keymap)
(defalias 'osm-prefix-map osm-prefix-map)
;; TODO add support for touchscreen-pinch for zooming.
(defvar-keymap osm-mode-map
:doc "Keymap used by `osm-mode'."
:parent (make-composed-keymap osm-prefix-map special-mode-map)
"<home>" #'osm-home
"+" #'osm-zoom-in
"-" #'osm-zoom-out
"SPC" #'osm-zoom-in
"S-SPC" #'osm-zoom-out
"<mouse-1>" #'osm-mouse-pin
"<mouse-2>" 'org-store-link
"<mouse-3>" #'osm-bookmark-set
"S-<down-mouse-1>" #'ignore
"S-<mouse-1>" #'osm-mouse-track
"<down-mouse-1>" #'osm-mouse-drag
"<down-mouse-2>" #'osm-mouse-drag
"<down-mouse-3>" #'osm-mouse-drag
"<drag-mouse-1>" #'ignore
"<drag-mouse-2>" #'ignore
"<drag-mouse-3>" #'ignore
"<up>" #'osm-up
"<down>" #'osm-down
"<left>" #'osm-left
"<right>" #'osm-right
"C-<up>" #'osm-up-up
"C-<down>" #'osm-down-down
"C-<left>" #'osm-left-left
"C-<right>" #'osm-right-right
"M-<up>" #'osm-up-up
"M-<down>" #'osm-down-down
"M-<left>" #'osm-left-left
"M-<right>" #'osm-right-right
"S-<up>" #'osm-up-up
"S-<down>" #'osm-down-down
"S-<left>" #'osm-left-left
"S-<right>" #'osm-right-right
"n" #'osm-rename
"d" #'osm-delete
"DEL" #'osm-delete
"<deletechar>" #'osm-delete
"c" #'osm-center
"o" #'clone-buffer
"u" #'osm-save-url
"l" 'org-store-link
"b" #'osm-bookmark-set
"X" #'osm-gpx-hide
"<remap> <scroll-down-command>" #'osm-down
"<remap> <scroll-up-command>" #'osm-up
"<" nil
">" nil)
(dolist (pin osm-pin-colors)
(setq pin (vector (car pin)))
(define-key key-translation-map pin #'osm--mouse-ignore-wheel)
(define-key osm-mode-map pin #'osm-mouse-select))
(easy-menu-define osm-mode-menu osm-mode-map
"Menu for `osm-mode'."
'("OSM"
["Go home" osm-home]
["Center" osm-center]
["Go to coordinates" osm-goto]
["Jump to pin" osm-jump]
["Search by name" osm-search]
["Change tile server" osm-server]
"--"
["Org Link" org-store-link]
["Geo Url" osm-save-url]
["Elisp Link" (osm-save-url t)]
("Bookmark"
["Set" osm-bookmark-set]
["Jump" osm-bookmark-jump]
["Rename" osm-bookmark-rename]
["Delete" osm-bookmark-delete])
"--"
["Show GPX file" osm-gpx-show]
["Hide GPX file" osm-gpx-hide]
"--"
["Clone buffer" clone-buffer]
["Revert buffer" revert-buffer]
"--"
["Manual" (info "(osm)")]
["Customize" (customize-group 'osm)]))
(defconst osm--placeholder
'(:type svg :width 256 :height 256
:data "<svg width='256' height='256' version='1.1' xmlns='http://www.w3.org/2000/svg'>
<defs>
<pattern id='grid' width='16' height='16' patternUnits='userSpaceOnUse'>
<path d='m 0 0 l 0 16 16 0' fill='none' stroke='#888888'/>
</pattern>
</defs>
<rect width='256' height='256' fill='url(#grid)'/>
</svg>")
"Placeholder image for tiles.")
(defvar osm--search-history nil
"Minibuffer history used by command `osm-search'.")
(defvar osm--jump-history nil
"Minibuffer history used by command `osm-jump'.")
(defvar osm--server-history nil
"Minibuffer history used by command `osm-server'.")
(defvar osm--purge-directory 0
"Last time the tile cache was cleaned.")
(defvar osm--tile-cache nil
"Global tile memory cache.")
(defvar osm--tile-age 0
"Tile age, incremented on every update.")
(defvar osm--gpx-files nil
"Global list of loaded tracks.")
(defvar osm--track nil
"List of track coordinates.")
(defvar osm--download-processes nil
"Globally active download processes.")
(defvar osm--download-active nil
"Globally active download jobs.")
(defvar osm--download-subdomain nil
"Subdomain indices to query the servers in a round-robin fashion.")
(defvar-local osm--download-queue nil
"Buffer-local tile download queue.")
(defvar-local osm--wx 0
"Half window width in pixel.")
(defvar-local osm--wy 0
"Half window height in pixel.")
(defvar-local osm--nx 0
"Number of tiles in x direction.")
(defvar-local osm--ny 0
"Number of tiles in y direction.")
(defvar-local osm--zoom nil
"Zoom level of the map.")
(defvar-local osm--lat nil
"Latitude coordinate.")
(defvar-local osm--lon nil
"Longitude coordinate.")
(defvar-local osm--overlays nil
"Overlay hash table.
Local per buffer since the overlays depend on the zoom level.")
(defvar-local osm--pin nil
"Currently selected pin.")
(defmacro osm--each (&rest body)
"Execute BODY in each `osm-mode' buffer."
(cl-with-gensyms (buf)
`(dolist (,buf (buffer-list))
(when (eq (buffer-local-value 'major-mode ,buf) #'osm-mode)
(with-current-buffer ,buf
,@body)))))
(defun osm--server-menu ()
"Generate server menu."
(let (menu last-group)
(dolist (server osm-server-list)
(let* ((plist (cdr server))
(group (plist-get plist :group)))
(unless (equal last-group group)
(push (format "─── %s ───" group) menu)
(setq last-group group))
(push
`[,(plist-get plist :name)
(osm-server ',(car server))
:style toggle
:selected (eq osm-server ',(car server))]
menu)))
(easy-menu-create-menu "Server" (nreverse menu))))
(defsubst osm--lon-to-normalized-x (lon)
"Convert LON to normalized x coordinate."
(/ (+ lon 180.0) 360.0))
(defsubst osm--lat-to-normalized-y (lat)
"Convert LAT to normalized y coordinate."
(setq lat (* lat (/ float-pi 180.0)))
(- 0.5 (/ (log (+ (tan lat) (/ 1.0 (cos lat)))) float-pi 2)))
(defun osm--boundingbox-to-zoom (lat1 lat2 lon1 lon2)
"Compute zoom level from boundingbox LAT1 to LAT2 and LON1 to LON2."
(let ((w (/ (frame-pixel-width) 256))
(h (/ (frame-pixel-height) 256)))
(max (osm--server-property :min-zoom)
(min
(osm--server-property :max-zoom)
(min (logb (/ w (abs (- (osm--lon-to-normalized-x lon1) (osm--lon-to-normalized-x lon2)))))
(logb (/ h (abs (- (osm--lat-to-normalized-y lat1) (osm--lat-to-normalized-y lat2))))))))))
(defun osm--x-to-lon (x zoom)
"Return longitude in degrees for X/ZOOM."
(- (/ (* x 360.0) 256.0 (expt 2.0 zoom)) 180.0))
(defun osm--y-to-lat (y zoom)
"Return latitude in degrees for Y/ZOOM."
(setq y (* float-pi (- 1 (* 2 (/ y 256.0 (expt 2.0 zoom))))))
(/ (* 180 (atan (/ (- (exp y) (exp (- y))) 2))) float-pi))
(defsubst osm--lon-to-x (lon zoom)
"Convert LON/ZOOM to x coordinate in pixel."
(floor (* 256 (expt 2.0 zoom) (osm--lon-to-normalized-x lon))))
(defsubst osm--lat-to-y (lat zoom)
"Convert LAT/ZOOM to y coordinate in pixel."
(floor (* 256 (expt 2.0 zoom) (osm--lat-to-normalized-y lat))))
(defsubst osm--x ()
"Return longitude in pixel of map center."
(osm--lon-to-x osm--lon osm--zoom))
(defsubst osm--y ()
"Return latitude in pixel of map center."
(osm--lat-to-y osm--lat osm--zoom))
(defsubst osm--x0 ()
"Return longitude in pixel of top left corner."
(- (osm--x) osm--wx))
(defsubst osm--y0 ()
"Return latitude in pixel of top left corner."
(- (osm--y) osm--wy))
(defun osm--server-property (prop &optional server)
"Return server property PROP for SERVER."
(or (plist-get (alist-get (or server osm-server) osm-server-list) prop)
(plist-get osm-server-defaults prop)))
(defun osm--tile-url (x y zoom)
"Return tile url for coordinate X, Y and ZOOM."
(let ((url (osm--server-property :url))
(sub (osm--server-property :subdomains))
(key (osm--server-property :key)))
(when (and (string-search "%k" url) (not key))
(require 'auth-source)
(declare-function auth-source-search "auth-source")
(let ((host (string-join
(last (split-string (cadr (split-string url "/" t)) "\\.") 2)
".")))
(setq key (plist-get
(car (auth-source-search :require '(:user :host :secret)
:host host
:user "apikey"))
:secret))
(unless key
(warn "No auth source secret found for apikey@%s" host)
(setq key ""))
(setf (plist-get (alist-get osm-server osm-server-list) :key) key)))
(format-spec
url `((?z . ,zoom) (?x . ,x) (?y . ,y)
(?k . ,(if (functionp key) (funcall key) key))
(?s . ,(nth (mod (alist-get osm-server osm--download-subdomain 0)
(length sub))
sub))))))
(defun osm--tile-file (x y zoom)
"Return tile file name for coordinate X, Y and ZOOM."
(file-name-concat
(expand-file-name osm-tile-directory)
(symbol-name osm-server)
(format "%d-%d-%d.%s"
zoom x y
(or (osm--server-property :ext)
(file-name-extension
(url-file-nondirectory
(osm--server-property :url)))))))
(defun osm--enqueue-download (x y)
"Enqueue tile X/Y for download."
(when (let ((n (expt 2 osm--zoom))) (and (>= x 0) (>= y 0) (< x n) (< y n)))
(let ((job (list osm-server osm--zoom x y)))
(unless (or (member job osm--download-queue) (member job osm--download-active))
(setq osm--download-queue (nconc osm--download-queue (list job)))))))
(defun osm--download-filter (output)
"Filter function for the download process which receives OUTPUT."
(while (string-match
"\\`\\([0-9]+\\) \\(.*?/\\([^/]+\\)/\\([0-9]+\\)-\\([0-9]+\\)-\\([0-9]+\\)\\.[^\r\n]+\\)\r?\n"
output)
(let ((status (match-string 1 output))
(file (match-string 2 output))
(server (intern-soft (match-string 3 output)))
(zoom (string-to-number (match-string 4 output)))
(x (string-to-number (match-string 5 output)))
(y (string-to-number (match-string 6 output))))
(setq output (substring output (match-end 0)))
(when (equal status "200")
(ignore-errors (rename-file file (string-remove-suffix ".tmp" file) t))
(osm--each
(when (and (= osm--zoom zoom) (eq osm-server server))
(osm--display-tile x y (osm--get-tile x y)))))
(cl-callf2 delete (list server zoom x y) osm--download-active)
(delete-file file)))
output)
(defun osm--download-command ()
"Build download command."
(let* ((count 0)
(batch (osm--server-property :download-batch))
(subs (length (osm--server-property :subdomains)))
(parallel (* subs (osm--server-property :max-connections)))
args jobs job)
(while (and (< count batch)
(setq job (nth (* count parallel) osm--download-queue)))
(pcase-let ((`(,_server ,zoom ,x ,y) job))
(setq args `(,(osm--tile-url x y zoom)
,(concat (osm--tile-file x y zoom) ".tmp")
"--output"
,@args))
(push job jobs)
(push job osm--download-active)
(cl-incf count)))
(osm--each
(dolist (job jobs)
(cl-callf2 delq job osm--download-queue)))
(cl-callf (lambda (s) (mod (1+ s) subs))
(alist-get osm-server osm--download-subdomain 0))
(cons `("curl" "--write-out" "%{http_code} %{filename_effective}\n"
,@(split-string-and-unquote osm-curl-options) ,@(nreverse args))
jobs)))
(defun osm--download ()
"Download next tiles from the queue."
(when (and (< (length (alist-get osm-server osm--download-processes))
(* (length (osm--server-property :subdomains))
(osm--server-property :max-connections)))
osm--download-queue)
(pcase-let ((`(,command . ,jobs) (osm--download-command))
(dir (file-name-concat (expand-file-name osm-tile-directory)
(symbol-name osm-server)))
(server osm-server))
(make-directory dir t)
(push
(make-process
:name "*osm curl*"
:connection-type 'pipe
:noquery t
:command command
:filter
(let ((output ""))
(lambda (_proc out)
(setq output (osm--download-filter (concat output out)))
(force-mode-line-update t)))
:sentinel
(lambda (proc _status)
(dolist (job jobs)
(cl-callf2 delq job osm--download-active))
(cl-callf2 delq proc (alist-get server osm--download-processes nil t))
(force-mode-line-update t)
(osm--download)))
(alist-get server osm--download-processes))
(force-mode-line-update t)
(osm--download))))
(defun osm-mouse-drag (event)
"Handle drag EVENT."
(declare (completion ignore))
(interactive "@e")
(pcase-let* ((`(,sx . ,sy) (posn-x-y (event-start event)))
(win (selected-window))
(map (define-keymap
"<mouse-movement>"
(lambda (event)
(interactive "e")
(setq event (event-start event))
(when (eq win (posn-window event))
(pcase-let ((`(,ex . ,ey) (posn-x-y event)))
(osm--move (- sx ex) (- sy ey))
(setq sx ex sy ey)
(osm--update)))))))
(setq track-mouse 'dragging)
(set-transient-map map
(lambda () (eq (car-safe last-command-event)
'mouse-movement))
(lambda () (setq track-mouse nil)))))
(defun osm--zoom-in-wheel (_n)
"Zoom in with the mouse wheel."
(pcase-let ((`(,x . ,y) (posn-x-y (event-start last-input-event))))
(when (< osm--zoom (osm--server-property :max-zoom))
(osm--move (/ (- x osm--wx) 2) (/ (- y osm--wy) 2))
(osm-zoom-in))))
(defun osm--zoom-out-wheel (_n)
"Zoom out with the mouse wheel."
(pcase-let ((`(,x . ,y) (posn-x-y (event-start last-input-event))))
(when (> osm--zoom (osm--server-property :min-zoom))
(osm--move (- osm--wx x) (- osm--wy y))
(osm-zoom-out))))
(defun osm-center ()
"Center to location of selected pin."
(interactive nil osm-mode)
(osm--barf-unless-osm)
(pcase osm--pin
(`(,lat ,lon ,_id ,name)
(setq osm--lat lat osm--lon lon)
(message "%s" name)
(osm--update))))
(defun osm--haversine (lat1 lon1 lat2 lon2)
"Compute distance between LAT1/LON1 and LAT2/LON2 in km."
;; https://en.wikipedia.org/wiki/Haversine_formula
(let* ((rad (/ float-pi 180))
(y (sin (* 0.5 rad (- lat2 lat1))))
(x (sin (* 0.5 rad (- lon2 lon1))))
(h (+ (* x x) (* (cos (* rad lat1)) (cos (* rad lat2)) y y))))
(* 2 6371 (atan (sqrt h) (sqrt (- 1 h))))))
(defun osm-mouse-track (event)
"Set track pin at location of the click EVENT."
(declare (completion ignore))
(interactive "@e")
(pcase osm--pin
((and (guard (not osm--track)) `(,lat ,lon ,_id ,_name))
(push (list lat lon "WP1") osm--track)))
(osm--set-pin-event event 'osm-track
(format "WP%s" (1+ (length osm--track))) 'quiet)
(pcase-let ((`(,lat ,lon ,_id ,name) osm--pin))
(push (list lat lon name) osm--track))
(osm--revert)
(osm--track-length))
(defun osm--track-length ()
"Echo track length."
(when (cdr osm--track)
(pcase-let* ((len1 0)
(len2 0)
(p osm--track)
(`(,sel-lat ,sel-lon ,_ ,sel-name) osm--pin))
(while (and (cdr p) (not (and (equal (caar p) sel-lat)
(equal (cadar p) sel-lon))))
(cl-incf len2 (osm--haversine (caar p) (cadar p)
(caadr p) (cadadr p)))
(pop p))
(while (cdr p)
(cl-incf len1 (osm--haversine (caar p) (cadar p)
(caadr p) (cadadr p)))
(pop p))
(message "%s way points, length %.2fkm, %s"
(length osm--track) (+ len1 len2)
(if (or (= len1 0) (= len2 0))
sel-name
(format "%.2fkm → %s → %.2fkm"
len1 sel-name len2))))))
(defun osm--pin-at (event &optional type)
"Get pin of TYPE at EVENT."
(let* ((xy (posn-x-y (event-start event)))
(x (+ (osm--x0) (car xy)))
(y (+ (osm--y0) (cdr xy)))
(min most-positive-fixnum)
found)
(dolist (pin (car (osm--get-overlays (/ x 256) (/ y 256))))
(pcase-let ((`(,p ,q ,_lat ,_lon ,id ,_name) pin))
(when (or (not type) (eq type id))
(let ((d (+ (* (- p x) (- p x)) (* (- q y) (- q y)))))
(when (and (>= q y) (< q (+ y 50)) (>= p (- x 20)) (< p (+ x 20)) (< d min))
(setq min d found pin))))))
(cddr found)))
(defun osm-mouse-pin (event)
"Create location pin at the click EVENT."
(declare (completion ignore))
(interactive "@e")
(osm--set-pin-event event)
(osm--update))
(defun osm-mouse-select (event)
"Select pin at position of click EVENT."
(declare (completion ignore))
(interactive "@e")
(when (memq (event-basic-type event) '(mouse-1 mouse-2 mouse-3))
(pcase (osm--pin-at event)
(`(,lat ,lon ,id ,name)
(osm--set-pin id lat lon name (eq id 'osm-track))
(when (eq id 'osm-track) (osm--track-length))
(osm--update)))))
(defun osm-zoom-in (&optional n)
"Zoom N times into the map."
(interactive "p" osm-mode)
(osm--barf-unless-osm)
(setq osm--zoom (max (osm--server-property :min-zoom)
(min (osm--server-property :max-zoom)
(+ osm--zoom (or n 1)))))
(osm--update))
(defun osm-zoom-out (&optional n)
"Zoom N times out of the map."
(interactive "p" osm-mode)
(osm-zoom-in (- (or n 1))))
(defun osm--move (dx dy)
"Move by DX/DY."
(osm--barf-unless-osm)
(setq osm--lon (osm--x-to-lon (+ (osm--x) dx) osm--zoom)
osm--lat (osm--y-to-lat (+ (osm--y) dy) osm--zoom)))
(defun osm-right (&optional n)
"Move N small steps to the right."
(interactive "p" osm-mode)
(osm--move (* (or n 1) osm-small-step) 0)
(osm--update))
(defun osm-down (&optional n)
"Move N small steps down."
(interactive "p" osm-mode)
(osm--move 0 (* (or n 1) osm-small-step))
(osm--update))
(defun osm-up (&optional n)
"Move N small steps up."
(interactive "p" osm-mode)
(osm-down (- (or n 1))))
(defun osm-left (&optional n)
"Move N small steps to the left."
(interactive "p" osm-mode)
(osm-right (- (or n 1))))
(defun osm-right-right (&optional n)
"Move N large steps to the right."
(interactive "p" osm-mode)
(osm--move (* (or n 1) osm-large-step) 0)
(osm--update))
(defun osm-down-down (&optional n)
"Move N large steps down."
(interactive "p" osm-mode)
(osm--move 0 (* (or n 1) osm-large-step))
(osm--update))
(defun osm-up-up (&optional n)
"Move N large steps up."
(interactive "p" osm-mode)
(osm-down-down (- (or n 1))))
(defun osm-left-left (&optional n)
"Move N large steps to the left."
(interactive "p" osm-mode)
(osm-right-right (- (or n 1))))
(defun osm--purge-directory ()
"Clean tile directory."
(when (and (integerp osm-max-age)
(> (- (float-time) osm--purge-directory) (* 60 60 24)))
(setq osm--purge-directory (float-time))
(run-with-idle-timer
30 nil
(lambda ()
(dolist (dir (directory-files osm-tile-directory t "\\`[^.]+\\'" t))
(dolist (file (directory-files
dir t "\\.\\(?:png\\|jpe?g\\)\\(?:\\.tmp\\)?\\'" t))
(when (> (float-time (time-since
(file-attribute-modification-time
(file-attributes file))))
(* 60 60 24 osm-max-age))
(delete-file file)))
(when (directory-empty-p dir)
(ignore-errors (delete-directory dir))))))))
(defun osm--check-libraries ()
"Check that Emacs is compiled with the necessary libraries."
(let (req)
(unless (display-graphic-p)
(push "graphical display" req))
(dolist (type '(svg jpeg png))
(unless (image-type-available-p type)
(push (format "%s support" type) req)))
(unless (libxml-available-p)
(push "libxml" req))
(unless (json-available-p)
(push "libjansson" req))
(when req
(error "Osm: Please compile Emacs with the required libraries, %s needed to proceed"
(string-join req ", ")))))
(define-derived-mode osm-mode special-mode "Osm"
"OpenStreetMap viewer mode."
:interactive nil :abbrev-table nil :syntax-table nil
(osm--check-libraries)
(setq-local osm-server osm-server
line-spacing nil
cursor-type nil
cursor-in-non-selected-windows nil
left-fringe-width 1
right-fringe-width 1
left-margin-width 0
right-margin-width 0
truncate-lines t
show-trailing-whitespace nil
display-line-numbers nil
buffer-read-only t
fringe-indicator-alist '((truncation . nil))
revert-buffer-function #'osm--revert
mode-line-process '(:eval (osm--download-queue-info))
mode-line-position nil
mode-line-modified nil
mode-line-mule-info nil
mode-line-remote nil
default-directory (expand-file-name "~/")
eldoc-documentation-functions nil
mouse-wheel-progressive-speed nil
mwheel-scroll-up-function #'osm--zoom-out-wheel
mwheel-scroll-down-function #'osm--zoom-in-wheel
mwheel-scroll-left-function #'osm--zoom-out-wheel
mwheel-scroll-right-function #'osm--zoom-in-wheel
bookmark-make-record-function #'osm--bookmark-record-default
imenu-create-index-function #'osm--imenu-index)
(when (boundp 'mwheel-coalesce-scroll-events)
(setq-local mwheel-coalesce-scroll-events t))
(when (boundp 'pixel-scroll-precision-mode)
(setq-local pixel-scroll-precision-mode nil))
(add-hook 'change-major-mode-hook #'osm--barf-change-mode nil 'local)
(add-hook 'write-contents-functions #'osm--barf-write nil 'local)
(add-hook 'window-size-change-functions
(let ((buf (current-buffer)))
(lambda (_)
(with-current-buffer buf
(osm--update))))
nil 'local))
(defun osm--barf-write ()
"Barf for write operation."
(set-buffer-modified-p nil)
(setq buffer-read-only t)
(set-visited-file-name nil)
(error "Writing the buffer to a file is not supported"))
(defun osm--barf-change-mode ()
"Barf for change mode operation."
(error "Changing the major mode is not supported"))
(defun osm--barf-unless-osm ()
"Barf if not an `osm-mode' buffer."
(unless (eq major-mode #'osm-mode)
(error "Not an `osm-mode' buffer")))
(defun osm--each-pin (fun)
"Call FUN for each pin on the map."
(pcase osm-home
(`(,lat ,lon ,zoom)
(funcall fun 'osm-home lat lon zoom "Home")))
(bookmark-maybe-load-default-file)
(cl-loop for bm in bookmark-alist
if (eq (bookmark-prop-get bm 'handler) #'osm-bookmark-jump) do
(pcase-let ((`(,lat ,lon ,zoom) (bookmark-prop-get bm 'coordinates)))
(funcall fun 'osm-bookmark lat lon zoom (car bm))))
(dolist (file osm--gpx-files)
(when-let ((start (caaadr file)))
(funcall fun 'osm-gpx-track (car start) (cdr start) 10 (car file)))
(cl-loop for (lat lon name) in (cddr file) do
(funcall fun 'osm-gpx-poi lat lon 15 name)))
(cl-loop for (lat lon name) in osm--track do
(funcall fun 'osm-track lat lon 15 name)))
(defun osm--pin-inside-p (x y lat lon)
"Return non-nil if pin at LAT/LON is inside tile X/Y."
(let ((p (/ (osm--lon-to-x lon osm--zoom) 256.0))
(q (/ (osm--lat-to-y lat osm--zoom) 256.0)))
(and (>= p (- x 0.125)) (< p (+ x 1.125))
(>= q y) (< q (+ y 1.25)))))
(defun osm--add-pin (pins id lat lon _zoom name)
"Add pin at LAT/LON with NAME and ID to the PINS hash table."
(let* ((x (osm--lon-to-x lon osm--zoom))
(y (osm--lat-to-y lat osm--zoom))
(x0 (/ x 256))
(y0 (/ y 256))
(pin (list x y lat lon id name)))
(push pin (gethash (cons x0 y0) pins))
(cl-loop
for i from -1 to 1 do
(cl-loop
for j from -1 to 0 do
(let ((x1 (/ (+ x (* 32 i)) 256))
(y1 (/ (+ y (* 64 j)) 256)))
(unless (and (= x0 x1) (= y0 y1))
(push pin (gethash (cons x1 y1) pins))))))))
;; TODO: The Bresenham algorithm used here to add the line segments to the tiles
;; has the issue that lines which go along a tile border may be drawn only
;; partially. Use a more precise algorithm instead.
(defun osm--add-track (tracks seg)
"Add track segment SEG to TRACKS hash table."
(when seg
(let ((p0 (cons (osm--lon-to-x (or (car-safe (cdar seg)) (cdar seg)) osm--zoom)
(osm--lat-to-y (caar seg) osm--zoom))))
(dolist (pt (cdr seg))
(let* ((px1 (cdr pt))
(px1 (osm--lon-to-x (if (consp px1) (car px1) px1) osm--zoom))
(py1 (osm--lat-to-y (car pt) osm--zoom))
(pdx (- px1 (car p0)))
(pdy (- py1 (cdr p0))))
;; Ignore point if too close to last point
(unless (< (+ (* pdx pdx) (* pdy pdy)) 50)
(let* ((p1 (cons px1 py1))
(line (cons p0 p1))
(x0 (/ (car p0) 256))
(y0 (/ (cdr p0) 256))
(x1 (/ px1 256))
(y1 (/ py1 256))
(sx (if (< x0 x1) 1 -1))
(sy (if (< y0 y1) 1 -1))
(dx (* sx (- x1 x0)))
(dy (* sy (- y0 y1)))
(err (+ dx dy)))
;; Bresenham
(while
(let ((ey (> (* err 2) dy))
(ex (< (* err 2) dx)))
(push line (gethash (cons x0 y0) tracks))
(unless (and (= x0 x1) (= y0 y1))