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canvas_tile.py
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74 lines (57 loc) · 2.98 KB
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# noinspection PyCompatibility
import tkinter
from typing import TYPE_CHECKING
if TYPE_CHECKING:
from .map_widget import TkinterMapView
class CanvasTile:
def __init__(self, map_widget: "TkinterMapView", image, tile_name_position):
self.map_widget = map_widget
self.image = image
self.tile_name_position = tile_name_position
self.upper_left_tile_pos = None
self.lower_right_tile_pos = None
self.canvas_object = None
self.widget_tile_width = 0
self.widget_tile_height = 0
def __del__(self):
# if CanvasTile object gets garbage collected or deleted, delete image from canvas
self.delete()
def set_image_and_position(self, image, tile_name_position):
self.image = image
self.tile_name_position = tile_name_position
self.draw(image_update=True)
def set_image(self, image):
self.image = image
self.draw(image_update=True)
def get_canvas_pos(self):
self.widget_tile_width = self.map_widget.lower_right_tile_pos[0] - self.map_widget.upper_left_tile_pos[0]
self.widget_tile_height = self.map_widget.lower_right_tile_pos[1] - self.map_widget.upper_left_tile_pos[1]
canvas_pos_x = ((self.tile_name_position[0] - self.map_widget.upper_left_tile_pos[
0]) / self.widget_tile_width) * self.map_widget.width
canvas_pos_y = ((self.tile_name_position[1] - self.map_widget.upper_left_tile_pos[
1]) / self.widget_tile_height) * self.map_widget.height
return canvas_pos_x, canvas_pos_y
def delete(self):
try:
self.map_widget.canvas.delete(self.canvas_object)
except Exception:
pass
def draw(self, image_update=False):
# calculate canvas position fro OSM coordinates
canvas_pos_x, canvas_pos_y = self.get_canvas_pos()
if self.canvas_object is None:
if not (self.image == self.map_widget.not_loaded_tile_image or self.image == self.image == self.map_widget.empty_tile_image):
self.canvas_object = self.map_widget.canvas.create_image(canvas_pos_x,
canvas_pos_y,
image=self.image,
anchor=tkinter.NW,
tags="tile")
else:
self.map_widget.canvas.coords(self.canvas_object, canvas_pos_x, canvas_pos_y)
if image_update:
if not (self.image == self.map_widget.not_loaded_tile_image or self.image == self.image == self.map_widget.empty_tile_image):
self.map_widget.canvas.itemconfig(self.canvas_object, image=self.image)
else:
self.map_widget.canvas.delete(self.canvas_object)
self.canvas_object = None
self.map_widget.manage_z_order()