我试图在osmgpsmap上绘制点，但是当我对示例文件进行更改时，我似乎无法使用do_draw_gps_point（）来获得“开罗上下文”来在地图上绘制一些东西。 >
尽管我看到examples在使用cairo.ImageSurface，但看起来好像已经不存在了，正如我在修改后的示例中看到的那样：
#!/usr/bin/python
"""
Copyright (C) Hadley Rich 2008 <hads@nice.net.nz>
based on main.c - with thanks to John Stowers
This 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; version 2.
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 <http://www.gnu.org/licenses/>.
"""
import sys
import os.path
import random
from math import pi
from gi.repository import Gtk
from gi.repository import Gdk
from gi.repository import GdkPixbuf
from gi.repository import GObject
from gi.repository import cairo
GObject.threads_init()
Gdk.threads_init()
from gi.repository import OsmGpsMap as osmgpsmap
print( "using library: %s (version %s)" % (osmgpsmap.__file__, osmgpsmap._version))
assert osmgpsmap._version == "1.0"
class DummyMapNoGpsPoint(osmgpsmap.Map):
def do_draw_gps_point(self, drawable):
pass
GObject.type_register(DummyMapNoGpsPoint)
class DummyLayer(GObject.GObject, osmgpsmap.MapLayer):
def __init__(self):
GObject.GObject.__init__(self)
def do_draw(self, gpsmap, gdkdrawable):
surface = cairo.ImageSurface(
cairo.FORMAT_RGB24, 10, 10)
dc = cairo.Context(surface)
dc.set_source_rgb(1, 1, 1)
dc.paint()
gpsmap.do_draw_gps_point(dc)
#REPL to explore eg "dir(gpsmap)"
#while True:
#print("enter")
#print(eval(input()))
def do_render(self, gpsmap):
pass
def do_busy(self):
return False
def do_button_press(self, gpsmap, gdkeventbutton):
return False
GObject.type_register(DummyLayer)
class UI(Gtk.Window):
def __init__(self):
Gtk.Window.__init__(self, type=Gtk.WindowType.TOPLEVEL)
self.set_default_size(500, 500)
self.connect('destroy', lambda x: Gtk.main_quit())
self.set_title('OpenStreetMap GPS Mapper')
self.vbox = Gtk.VBox(False, 0)
self.add(self.vbox)
if 0:
self.osm = DummyMapNoGpsPoint()
else:
self.osm = osmgpsmap.Map()#user_agent="mapviewer.py/%s" % osmgpsmap._version)
self.osm.layer_add(
osmgpsmap.MapOsd(
show_dpad=True,
show_zoom=True,
show_crosshair=True)
)
self.osm.layer_add(
DummyLayer()
)
self.last_image = None
self.osm.connect('button_press_event', self.on_button_press)
self.osm.connect('button_release_event', self.on_button_release)
#connect keyboard shortcuts
self.osm.set_keyboard_shortcut(osmgpsmap.MapKey_t.FULLSCREEN, Gdk.keyval_from_name("F11"))
self.osm.set_keyboard_shortcut(osmgpsmap.MapKey_t.UP, Gdk.keyval_from_name("Up"))
self.osm.set_keyboard_shortcut(osmgpsmap.MapKey_t.DOWN, Gdk.keyval_from_name("Down"))
self.osm.set_keyboard_shortcut(osmgpsmap.MapKey_t.LEFT, Gdk.keyval_from_name("Left"))
self.osm.set_keyboard_shortcut(osmgpsmap.MapKey_t.RIGHT, Gdk.keyval_from_name("Right"))
#connect to tooltip
self.osm.props.has_tooltip = True
self.osm.connect("query-tooltip", self.on_query_tooltip)
self.latlon_entry = Gtk.Entry()
zoom_in_button = Gtk.Button(stock=Gtk.STOCK_ZOOM_IN)
zoom_in_button.connect('clicked', self.zoom_in_clicked)
zoom_out_button = Gtk.Button(stock=Gtk.STOCK_ZOOM_OUT)
zoom_out_button.connect('clicked', self.zoom_out_clicked)
home_button = Gtk.Button(stock=Gtk.STOCK_HOME)
home_button.connect('clicked', self.home_clicked)
cache_button = Gtk.Button('Cache')
cache_button.connect('clicked', self.cache_clicked)
self.vbox.pack_start(self.osm, True, True, 0)
hbox = Gtk.HBox(False, 0)
hbox.pack_start(zoom_in_button, False, True, 0)
hbox.pack_start(zoom_out_button, False, True, 0)
hbox.pack_start(home_button, False, True, 0)
hbox.pack_start(cache_button, False, True, 0)
#add ability to test custom map URIs
ex = Gtk.Expander(label="<b>Map Repository URI</b>")
ex.props.use_markup = True
vb = Gtk.VBox()
self.repouri_entry = Gtk.Entry()
self.repouri_entry.set_text(self.osm.props.repo_uri)
self.image_format_entry = Gtk.Entry()
self.image_format_entry.set_text(self.osm.props.image_format)
lbl = Gtk.Label(
"""
Enter an repository URL to fetch map tiles from in the box below. Special metacharacters may be included in this url
<i>Metacharacters:</i>
\t#X\tMax X location
\t#Y\tMax Y location
\t#Z\tMap zoom (0 = min zoom, fully zoomed out)
\t#S\tInverse zoom (max-zoom - #Z)
\t#Q\tQuadtree encoded tile (qrts)
\t#W\tQuadtree encoded tile (1234)
\t#U\tEncoding not implemeted
\t#R\tRandom integer, 0-4""")
lbl.props.xalign = 0
lbl.props.use_markup = True
lbl.props.wrap = True
ex.add(vb)
vb.pack_start(lbl, False, True, 0)
hb = Gtk.HBox()
hb.pack_start(Gtk.Label("URI: "), False, True, 0)
hb.pack_start(self.repouri_entry, True, True, 0)
vb.pack_start(hb, False, True, 0)
hb = Gtk.HBox()
hb.pack_start(Gtk.Label("Image Format: "), False, True, 0)
hb.pack_start(self.image_format_entry, True, True, 0)
vb.pack_start(hb, False, True, 0)
gobtn = Gtk.Button("Load Map URI")
gobtn.connect("clicked", self.load_map_clicked)
vb.pack_start(gobtn, False, True, 0)
self.show_tooltips = False
cb = Gtk.CheckButton("Show Location in Tooltips")
cb.props.active = self.show_tooltips
cb.connect("toggled", self.on_show_tooltips_toggled)
self.vbox.pack_end(cb, False, True, 0)
cb = Gtk.CheckButton("Disable Cache")
cb.props.active = False
cb.connect("toggled", self.disable_cache_toggled)
self.vbox.pack_end(cb, False, True, 0)
self.vbox.pack_end(ex, False, True, 0)
self.vbox.pack_end(self.latlon_entry, False, True, 0)
self.vbox.pack_end(hbox, False, True, 0)
GObject.timeout_add(500, self.print_tiles)
def disable_cache_toggled(self, btn):
if btn.props.active:
self.osm.props.tile_cache = osmgpsmap.MAP_CACHE_DISABLED
else:
self.osm.props.tile_cache = osmgpsmap.MAP_CACHE_AUTO
def on_show_tooltips_toggled(self, btn):
self.show_tooltips = btn.props.active
def load_map_clicked(self, button):
uri = self.repouri_entry.get_text()
format = self.image_format_entry.get_text()
if uri and format:
if self.osm:
#remove old map
self.vbox.remove(self.osm)
try:
self.osm = osmgpsmap.Map(
repo_uri=uri,
image_format=format
)
except Exception:
print( "ERROR:" )
self.osm = osm.Map()
self.vbox.pack_start(self.osm, True, True, 0)
self.osm.connect('button_release_event', self.map_clicked)
self.osm.show()
def print_tiles(self):
if self.osm.props.tiles_queued != 0:
print( self.osm.props.tiles_queued+ ' tiles queued' )
return True
def zoom_in_clicked(self, button):
self.osm.set_zoom(self.osm.props.zoom + 1)
def zoom_out_clicked(self, button):
self.osm.set_zoom(self.osm.props.zoom - 1)
def home_clicked(self, button):
self.osm.set_center_and_zoom(-44.39, 171.25, 12)
def on_query_tooltip(self, widget, x, y, keyboard_tip, tooltip, data=None):
if keyboard_tip:
return False
if self.show_tooltips:
print(dir(osmgpsmap))
#p = osmgpsmap.point_new_degrees(0.0, 0.0)
self.osm.convert_screen_to_geographic(x, y)#, p)
lat,lon = p.get_degrees()
tooltip.set_markup("%+.4f, %+.4f" % (lat, lon ))
return True
return False
def cache_clicked(self, button):
bbox = self.osm.get_bbox()
self.osm.download_maps(
*bbox,
zoom_start=self.osm.props.zoom,
zoom_end=self.osm.props.max_zoom
)
def on_button_release(self, osm, event):
self.latlon_entry.set_text(
'Map Centre: latitude %s longitude %s' % (
self.osm.props.latitude,
self.osm.props.longitude
)
)
def on_button_press(self, osm, event):
state = event.get_state()
lat,lon = self.osm.get_event_location(event).get_degrees()
left = event.button == 1 and state == 0
middle = event.button == 2 or (event.button == 1 and state & Gdk.ModifierType.SHIFT_MASK)
right = event.button == 3 or (event.button == 1 and state & Gdk.ModifierType.CONTROL_MASK)
#work around binding bug with invalid variable name
GDK_2BUTTON_PRESS = getattr(Gdk.EventType, "2BUTTON_PRESS")
GDK_3BUTTON_PRESS = getattr(Gdk.EventType, "3BUTTON_PRESS")
if event.type == GDK_3BUTTON_PRESS:
if middle:
if self.last_image is not None:
self.osm.image_remove(self.last_image)
self.last_image = None
elif event.type == GDK_2BUTTON_PRESS:
if left:
self.osm.gps_add(lat, lon, heading=random.random()*360)
if middle:
pb = GdkPixbuf.Pixbuf.new_from_file_at_size ("poi.png", 24,24)
self.last_image = self.osm.image_add(lat,lon,pb)
if right:
pass
if __name__ == "__main__":
u = UI()
u.show_all()
if os.name == "nt": Gdk.threads_enter()
Gtk.main()
if os.name == "nt": Gdk.threads_leave()
给予
AttributeError：'gi.repository.cairo'对象没有属性'ImageSurface'