def load_elements(self):
""" Start loading OSM elements from the api which belong in the current map view.
"""
left, top = self.screen2xy(0, 0)
right, bottom = self.screen2xy(self.frameGeometry().width(), self.frameGeometry().height())
north, west = calc.xy2deg(left, bottom)
south, east = calc.xy2deg(right, top)
self.elements_loader.load(west, north, east, south)
self.update()
def set_xy(self, x, y):
""" Set center of the view.
Args:
x (float): mercator x of the center
y (float): mercator y of the center
"""
self.x = x
self.y = y
self.lat, self.lon = calc.xy2deg(self.x, self.y)
self.set_zoom(self.zoom)
def set_position(self, x, y):
""" Set new position of node
Args:
x (float): mercator x
y (float): mercator y
"""
self.x = x
self.y = y
lat, lon = calc.xy2deg(x, y)
self.data["lat"], self.data["lon"] = str(lat), str(lon)
def mousePressEvent(self, event):
""" Callback when the mouse is clicked. This is use to react on a click on the OSM copyright, select a node
or create a new node.
Args:
event (Event): contains the click information
"""
if event.buttons() == QtCore.Qt.LeftButton:
# click on copyright
if event.x() > self.frameGeometry().width() - self.osm_copyright.width - self.osm_copyright.margin and \
event.y() > self.frameGeometry().height() - self.osm_copyright.height - self.osm_copyright.margin:
webbrowser.open(self.osm_copyright.url)
return
if self.mode == "normal":
if event.buttons() == QtCore.Qt.RightButton:
posx = event.x()
posy = event.y()
smallest = 9999999
elem_id = None
for key, elem in self.elements_loader.elements.items():
xscreen, yscreen = self.xy2screen(elem.x, elem.y)
dist = np.sqrt((xscreen - posx)**2 + (yscreen - posy)**2)
if dist < smallest:
elem_id = key
smallest = dist
if elem_id:
self.elements_loader.selected_node = elem_id
self.update()
self.element_viewer.set_node(
self.elements_loader.elements[elem_id])
elif self.mode == "new_node":
if event.buttons() == QtCore.Qt.RightButton:
x, y = self.screen2xy(event.x(), event.y())
lat, lon = calc.xy2deg(x, y)
self.elements_loader.new_node(lat, lon)
self.update()
self.change_mode("normal")
def from_xy(cls, x, y):
lat, lon = calc.xy2deg(x, y)
return cls(lat, lon)