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demo.py
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demo.py
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import tkinter
from proximal import get_closest
# Constants
CANVAS_SIZE = 900
RL = CANVAS_SIZE / 3 / 2 # distance from center to rect corners
OL = CANVAS_SIZE * 10 # gridline length (extends past visible area)
RECT = (-RL, -RL, RL, RL)
SHIFT_KEYCODE = 16
# GUI state
current_line = None
closest_line = None
snap_to_axis = False
def enable_snap_to_axis(event):
global snap_to_axis
if event.keycode == SHIFT_KEYCODE:
snap_to_axis = True
update_lines(event)
def disable_snap_to_axis(event):
global snap_to_axis
if event.keycode == SHIFT_KEYCODE:
snap_to_axis = False
update_lines(event)
def place_endpoint(event):
global current_line
global closest_line
if not current_line:
x0, y0 = canvas.canvasx(event.x), canvas.canvasy(event.y)
current_line = canvas.create_line(x0, y0, x0, y0, fill='#000000', width=4, capstyle='round')
closest_line = canvas.create_line(x0, y0, x0, y0, fill='#f30f30', capstyle='round')
update_lines(event)
else:
current_line = None
canvas.itemconfig(closest_line, fill='#a30a30')
def cancel_line(event):
global current_line
global closest_line
if current_line:
canvas.delete(current_line)
canvas.delete(closest_line)
current_line = None
closest_line = None
def update_lines(event):
if not current_line:
return
x0, y0 = tuple(canvas.coords(current_line)[0:2])
x1, y1 = canvas.canvasx(event.x), canvas.canvasy(event.y)
if snap_to_axis:
if abs(x0 - x1) < abs(y0 - y1):
x1 = x0
else:
y1 = y0
closest = get_closest(x0, y0, x1, y1, *RECT)
if len(closest) == 2:
closest *= 2
if closest[0:2] == closest[2:4]:
canvas.itemconfig(closest_line, width=15)
else:
canvas.itemconfig(closest_line, width=5)
canvas.coords(closest_line, *closest)
canvas.coords(current_line, x0, y0, x1, y1)
def resize_canvas(event):
w, h = event.width, event.height
canvas.config(scrollregion=(-w/2, -h/2, w/2, h/2))
canvas.xview_moveto(0)
canvas.yview_moveto(0)
# Initialize GUI
root = tkinter.Tk()
canvas = tkinter.Canvas(root, width=CANVAS_SIZE, height=CANVAS_SIZE, background='#ffffff', confine=False)
canvas.pack(fill='both', expand=1)
# Event bindings for interactivity
root.bind('<KeyPress>', enable_snap_to_axis)
root.bind('<KeyRelease>', disable_snap_to_axis)
root.bind('<Escape>', cancel_line)
canvas.bind('<Configure>', resize_canvas)
canvas.bind('<1>', place_endpoint)
canvas.bind('<Motion>', update_lines)
# Background grid
canvas.create_line(-RL, -OL, -RL, OL, fill='#eeeeee', width=4)
canvas.create_line( RL, -OL, RL, OL, fill='#eeeeee', width=4)
canvas.create_line(-OL, -RL, OL, -RL, fill='#eeeeee', width=4)
canvas.create_line(-OL, RL, OL, RL, fill='#eeeeee', width=4)
# Main rectangle
canvas.create_rectangle(*RECT, outline='#000000', width=4)
# Start GUI loop
root.mainloop()