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Reticule lines to extend through the whole window. 

They are mostly meant to help locate the focus when scrolling through
the large star map: scroll x (or y) until you see the line then scroll y
(or x) to find the focus; so they should extend to the scrollregion.
This commit is contained in:
Simon Forman 2024-04-16 13:30:43 -07:00
parent b04472619b
commit 8e88347e37
1 changed files with 7 additions and 31 deletions
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38
reticule.py
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@ -22,19 +22,16 @@
class Reticule:
def __init__(self, canvas, radius_x=35, radius_y=20, color='green'):
def __init__(self, canvas, width, height, radius_x=35, radius_y=20, color='green'):
self.canvas = canvas
self.width = width
self.height = height
self.radius_x = radius_x
self.radius_y = radius_y
self.color = color
self.item_ids = []
self.init_reticule()
self.xy_cache = 0, 0
self.canvas.bind(
'<Configure>',
self.handle_canvas_resize,
add='+',
)
def get_reticule_coords(self, x, y):
'''
@ -42,8 +39,8 @@ class Reticule:
rectangle yield coords for four lines and an oval suitable for
passing to canvas.coords() method.
'''
width = int(self.canvas['width'])
height = int(self.canvas['height'])
width = self.width
height = self.height
top = y - self.radius_y
left = x - self.radius_x
@ -58,7 +55,7 @@ class Reticule:
def init_reticule(self):
append = self.item_ids.append
w, h = int(self.canvas['width']), int(self.canvas['height'])
w, h = self.width, self.height
coords = self.get_reticule_coords(w >> 1, h >> 1) # Center.
append(canvas.create_line(*next(coords), fill=self.color))
@ -76,36 +73,15 @@ class Reticule:
def handle_set_event(self, event):
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__':
from tkinter import *
def handle_canvas_resize(event):
# I don't know why the Tk system doesn't update these values.
canvas['width'] = event.width
canvas['height'] = event.height
# update reticule here/now?
# If the canvas window has enlarged then some of the lines will have
# to be extended.
canvas = Canvas(bg='black')
canvas.bind('<Configure>', handle_canvas_resize)
canvas.pack(expand=True, fill=BOTH)
canvas.update()
# Let the configure event propagate and trigger the
# handle_canvas_resize() callback to set the width
# and height values of the canvas correctly so that
# the reticule lines get drawn correctly.
reticule = Reticule(canvas)
reticule = Reticule(canvas, 1024, 768)
canvas.bind('<Button-1>', reticule.handle_set_event)
canvas.bind('<B1-Motion>', reticule.handle_set_event)