class UI(tk.Tk):
def __init__(self):
tk.Tk.__init__(self)
self.geometry(f'{WIDTH}x{HEIGHT}')
self.title('GooMPy')
self.canvas = tk.Canvas(self, width=WIDTH, height=HEIGHT)
self.canvas.pack(fill='both')
self.bind("<Key>", self.check_quit)
self.bind('<B1-Motion>', self.drag)
self.bind('<Button-1>', self.click)
self.radiogroup = tk.Frame(self.canvas)
self.radiovar = tk.IntVar()
self.maptypes = ['roadmap', 'terrain', 'satellite', 'hybrid']
self.add_radio_button(0)
self.add_radio_button(1)
self.add_radio_button(2)
self.add_radio_button(3)
self.zoom_in_button = self.add_zoom_button('+', +1)
self.zoom_out_button = self.add_zoom_button('-', -1)
self.zoomlevel = ZOOM
self.radiovar.set(0)
self.goompy = GooMPy(
WIDTH, HEIGHT, LATITUDE, LONGITUDE, ZOOM, radius_meters=RADIUS)
self.goompy.use_map_type(MAPTYPE)
self.redraw()
def add_zoom_button(self, text, sign):
button = tk.Button(
self.canvas, text=text, width=1, command=lambda: self.zoom(sign))
return button
def set_cursor_to_normal(self):
self.config(cursor='')
self.update_idletasks()
def set_cursor_to_wait(self):
# A little trick to get a watch cursor along with loading
self.config(cursor='watch')
self.update_idletasks()
def add_radio_button(self, index):
maptype = self.maptypes[index]
tk.Radiobutton(self.radiogroup, text=maptype, variable=self.radiovar, value=index,
command=lambda: self.usemap(maptype)).grid(row=0, column=index)
def click(self, event):
self.coords = event.x, event.y
lon = self.goompy.get_lon_from_x(self.coords[0])
lat = self.goompy.get_lat_from_y(self.coords[1])
# TODO debug print statement
print(f'x: {self.coords[0]}, y: {self.coords[1]} '
f'lon: {lon:.4f}, lat: {lat:.4f}')
def drag(self, event):
self.goompy.move(self.coords[0] - event.x, self.coords[1] - event.y)
self.redraw()
self.coords = event.x, event.y
def redraw(self):
# clear the canvas
self.canvas.delete('all')
image = self.goompy.get_image()
self.my_image = ImageTk.PhotoImage(image)
self.canvas.create_image(0, 0, image=self.my_image, anchor='nw')
self.radiogroup.place(x=0, y=0)
x = int(self.canvas['width']) - 50
y = int(self.canvas['height']) - 80
self.zoom_in_button.place(x=x, y=y)
self.zoom_out_button.place(x=x, y=y + 30)
self.draw_point(LATITUDE, LONGITUDE, fill='blue')
def usemap(self, maptype):
self.set_cursor_to_wait()
self.goompy.use_map_type(maptype)
self.set_cursor_to_normal()
self.redraw()
def zoom(self, sign):
self.set_cursor_to_wait()
self.zoomlevel = self.goompy.get_zoom
newlevel = self.zoomlevel + sign
if 0 < newlevel < 22:
self.zoomlevel = newlevel
self.goompy.use_zoom(newlevel)
self.redraw()
self.set_cursor_to_normal()
def draw_point(self, lat, lon, size=None, **kwargs):
x = self.goompy.get_xwin_from_lon(lon)
y = self.goompy.get_ywin_from_lat(lat)
if size is None:
size = int(DEFAULT_SYMBOL_SIZE / 2)
elif not -1 < size <= MAX_SYMBOL_SIZE:
raise ValueError(f'size drawing object must be positive and '
f'less than {MAX_SYMBOL_SIZE + 1}')
else:
size = int(size/2)
bbox = (x - size, y - size, x + size, y + size)
self.canvas.create_oval(*bbox, **kwargs)
def check_quit(self, event):
if ord(event.char) == 27: # ESC
exit(0)
