9:- module(gmap, 10 [ gmap//1 % +Coordinates 11 ]). 12 13:- use_module(library(http/html_write)). 14:- use_module(library(uri)). 15:- ensure_loaded(weblog(resources/resources)). 16 17% this makes sure there's always a setting 18% weblog users - do NOT change this. Copy keys/googlekey.pl.example 19% to keys/googlekey.pl and edit 20:- setting( 21 google_map_key, 22 atom, 23 notarealgooglekey, % don't change this here 24 'Google map key. "abcdefg" works for localhost (didn\'t for me -AO)' 25). 26 27 28gmap_scheme(_NoScheme). ('maps.googleapis.com'). 30gmap_path('/maps/api/js'). 31gmap_fragment(_NoFragment). 32 33prologmessage(missing_key_file(File)) --> 34 ['Key file ~w is missing'-[File], nl]. 35:- 36 % Print an error message if the keyfile is not present. 37 ( 38 absolute_file_name( 39 weblog('keys/googlekey'), 40 File, 41 [access(read), file_errors(fail), file_type(prolog)] 42 ) 43 -> 44 load_settings(File, [undefined(error)]) 45 ; 46% AO - 9/21/13 making this less in your face 47% 48% print_message(warning, missing_key_file('googlekey.pl')) 49 debug(weblog, 'Google map key file missing (keys/googlekey.pl)', []) 50 ). 51 52% needed for some coord calc stuff 53:- use_module(weblog(info/maps/map)).
Do not call this directly, call it through geo_map and
bind provider(google) (or do nothing, google is the default)
Generator is an arity n term that corresponds to an arity n+1 predicate.
gmap//1 will repeatedly query Generator for information and build up the map. The final argument may be
id(-ID) The map div id and javascript variable name will be set to
this. default lmap or gmap depending on provider. must be valid
javascript identifier as atom.zoom(Zoom) The zoom level. Provider specific how this maps to a
viewport. Default 14center(Lat, Long) center map view here. defaults to average of
pointspoint(-Lat, -Long) A marker will be placed at this pointicon_for(+point(Lat, Long), -IconName) icon to use for this point.
default is provider default iconpopup_for(-HTML, +point(Lat, Long))termerized HTML to put in popuptooltip_for(+point(Lat, Long), -ToolTipText) contents of tooltipmaptype(-Type) only meaningful for google maps, is the constant for
google.maps.MapTypeId (one of 'HYBRID', 'ROADMAP', 'SATELLITE', 'TERRAIN')Defining icon types means binding an icon/3 for each type, then binding all the properties
icon(-Name, -ImageSource, -ShadowSource) Defines an icon type name.Defining an icon requires that the following be defined for each icon type name:
icon_size(+Name, X, Y) size of icon imageshadow_size(+Name, X, Y) size of shadow imageicon_anchor(+Name, X, Y) offset from UL of image to the point
touching the spot on the mapshadow_anchor(+Name, X, Y) offset
from UL of shadow image to the point touching the spot on mappopup_anchor(+Name, X, Y) offset from the point touching map to
where the popup appears (so, eg, Y coord is often negative)
@tbd add an example to docs
*/
114gmap(_) --> 115 { 116 setting(google_map_key, notarealgooglekey) 117 }, 118 !, 119 html([p('Missing google key in weblog/keys/googlekey.pl')]). 120gmap(Generator) --> 121 { 122 (call(Generator, id(ID)) ; ID = gmap), 123 setting(google_map_key, Key), 124 Key \= notarealgooglekey, 125 !, 126 gmap_scheme(Scheme), 127 gmap_authority(Authority), 128 gmap_path(Path), 129 uri_query_components(Search, [key=Key, sensor=false, v=3]), 130 uri_components( 131 URI, 132 uri_components(Scheme, Authority, Path, Search, _Fragment) 133 ) 134 }, 135 html([ 136 \html_post(head, script([src(URI), type('text/javascript')], [])), 137 \html_post(head, [\show_map(Generator)]), 138 div(id(ID), []) 139 ]). 140 141gmap(_) --> 142 html([p('gmap failed')]). 143 144show_map(Generator) --> 145 { 146 ( call(Generator, id(ID)) ; ID = gmap ), 147 ( call(Generator, zoom(Zoom)) ; Zoom = 14 ), 148 ( call(Generator, maptype(MT)), 149 member(MT, ['HYBRID', 'ROADMAP', 'SATELLITE', 'TERRAIN']) 150 ; 151 MT = 'TERRAIN' ), 152 % setof fails if the goal always does 153 ( setof(point(X,Y), call(Generator, point(X,Y)), Coordinates) ; 154 Coordinates = []), 155 ( 156 call(Generator, center(CLat, CLong)) 157 ; average_geopoints(Coordinates, point(CLat, CLong)) 158 ) 159 }, 160 define_icons(Generator), 161 html(script(type('text/javascript'), [ 162\[' var ~w; 163 function initialize() { 164 var mapOptions = { 165 center: new google.maps.LatLng(~w, ~w), 166 zoom: ~w,~n'-[ID,CLat, CLong, Zoom], 167' mapTypeId: google.maps.MapTypeId.~w, 168 mapTypeControl: false 169 }; 170'-[MT], 171' ~w = new google.maps.Map(document.getElementById("~w"), 172 mapOptions);~n'-[ID, ID], 173 \coords(Generator, Coordinates), 174'~n } 175 google.maps.event.addDomListener(window, \'load\', initialize);~n'-[ID,ID]]])). 176 177coords(_, []) --> []. 178coords(Generator, [point(Lat, Long)|T]) --> 179 { 180 ( call(Generator, id(ID)) ; ID = gmap ), 181 ( 182 call(Generator, icon_for(point(Lat, Long), N)), 183 format(atom(IconAtom), ', icon: ~wIcon,~n', [N]) 184 ; 185 IconAtom = '' 186 ), 187 ( call(Generator, tooltip_for(point(Lat, Long), ToolTip)), 188 format(atom(ToolTipText), ', title: "~w"\n',[ToolTip]) 189 ; 190 ToolTipText = '' 191 ) 192 }, 193 html('(new google.maps.Marker({ 194 position: new google.maps.LatLng(~w, ~w) 195~w~w 196})).setMap(~w);~n'-[Lat, Long, IconAtom, ToolTipText, ID]), 197 coords(Generator, T). 198 199define_icons(Generator) --> 200 { 201 setof(Name, A^B^call(Generator, icon(Name, A, B)), Names),! 202 }, 203 html(script(type('text/javascript'), [ 204 \def_icons_helper(Generator, Names) ])). 205% fallback if no icons defined 206define_icons(_) --> []. 207 208def_icons_helper(_, []) --> []. 209def_icons_helper(Generator, [H|T]) --> 210 { 211 call(Generator, icon(H, ImgSrc, _)), 212 call(Generator, icon_size(H, IconSizeX, IconSizeY)), 213 call(Generator, icon_anchor(H, IconAnchorX, IconAnchorY)) 214 }, 215 html([ 216 'var ~wIcon = { 217 url: \'~w\',~n'-[H, ImgSrc], 218 ' size: new google.maps.Size(~w, ~w),~n'-[IconSizeX, IconSizeY], 219 ' origin: new google.maps.Point(0,0), 220 iconAnchor: new google.maps.Point(~w, ~w) 221};~n'-[IconAnchorX, IconAnchorY] 222 ]), 223 def_icons_helper(Generator, T). 224def_icons_helper(Generator, [H|T]) --> 225 html(\[' // ~w could not be generated (missing values?)~n'-[H]]), 226 def_icons_helper(Generator, T)
Google Maps display
A (for now) rudimentary google maps component.
This code provided to weblog by Cliopatria project Licensed under LGPL */