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Cache x y to deal with resizing canvas.

This commit is contained in:
Simon Forman 2024-04-16 12:21:00 -07:00
parent 8eab96431d
commit b04472619b
1 changed files with 18 additions and 2 deletions
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20
reticule.py
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@ -29,6 +29,12 @@ class Reticule:
self.color = color self.color = color
self.item_ids = [] self.item_ids = []
self.init_reticule() self.init_reticule()
self.xy_cache = 0, 0
self.canvas.bind(
'<Configure>',
self.handle_canvas_resize,
add='+',
)
def get_reticule_coords(self, x, y): def get_reticule_coords(self, x, y):
''' '''
@ -36,11 +42,14 @@ class Reticule:
rectangle yield coords for four lines and an oval suitable for rectangle yield coords for four lines and an oval suitable for
passing to canvas.coords() method. passing to canvas.coords() method.
''' '''
width, height = int(self.canvas['width']), int(self.canvas['height']) width = int(self.canvas['width'])
height = int(self.canvas['height'])
top = y - self.radius_y top = y - self.radius_y
left = x - self.radius_x left = x - self.radius_x
bottom = y + self.radius_y bottom = y + self.radius_y
right = x + self.radius_x right = x + self.radius_x
yield 0, y, left, y yield 0, y, left, y
yield right, y, width - 1, y yield right, y, width - 1, y
yield x, 0, x, top yield x, 0, x, top
@ -51,6 +60,7 @@ class Reticule:
append = self.item_ids.append append = self.item_ids.append
w, h = int(self.canvas['width']), int(self.canvas['height']) w, h = int(self.canvas['width']), int(self.canvas['height'])
coords = self.get_reticule_coords(w >> 1, h >> 1) # Center. coords = self.get_reticule_coords(w >> 1, h >> 1) # Center.
append(canvas.create_line(*next(coords), fill=self.color)) append(canvas.create_line(*next(coords), fill=self.color))
append(canvas.create_line(*next(coords), fill=self.color)) append(canvas.create_line(*next(coords), fill=self.color))
append(canvas.create_line(*next(coords), fill=self.color)) append(canvas.create_line(*next(coords), fill=self.color))
@ -58,6 +68,7 @@ class Reticule:
append(canvas.create_oval(*next(coords), outline=self.color)) append(canvas.create_oval(*next(coords), outline=self.color))
def set_reticule(self, x, y): def set_reticule(self, x, y):
self.xy_cache = x, y
coords = self.get_reticule_coords(x, y) coords = self.get_reticule_coords(x, y)
for item_id, item_coords in zip(self.item_ids, coords): for item_id, item_coords in zip(self.item_ids, coords):
self.canvas.coords(item_id, *item_coords) self.canvas.coords(item_id, *item_coords)
@ -65,6 +76,12 @@ class Reticule:
def handle_set_event(self, event): def handle_set_event(self, event):
self.set_reticule(event.x, event.y) self.set_reticule(event.x, event.y)
def handle_canvas_resize(self, _event):
# We're going to assume that some other callback has updated the
# canvas values. Otherwise we could get the new width and height
# from the Configure event.
self.set_reticule(*self.xy_cache)
if __name__ == '__main__': if __name__ == '__main__':
from tkinter import * from tkinter import *
@ -77,7 +94,6 @@ if __name__ == '__main__':
# If the canvas window has enlarged then some of the lines will have # If the canvas window has enlarged then some of the lines will have
# to be extended. # to be extended.
canvas = Canvas(bg='black') canvas = Canvas(bg='black')
canvas.bind('<Configure>', handle_canvas_resize) canvas.bind('<Configure>', handle_canvas_resize)