35-line-styles.py

#

All rights reserved. This program and the accompanying materials are made available under the terms of the Eclipse Public License v1.0 which accompanies this distribution, and is available at http://www.eclipse.org/legal/epl-v10.html

Contributors: Pavel Tisnovsky

link to source: https://github.com/tisnik/most-popular-python-libs/blob/master/PySimpleGUI/35-line-styles.py

link to source in literate programming format: https://tisnik.github.io/most-popular-python-libs/PySimpleGUI/35-line-styles.html

import tkinter

import PySimpleGUI as sg

#

kreslicí plátno

canvas = sg.Canvas(background_color="#ccffcc", size=(400, 400))

#

ovládací prvky, které se mají zobrazit v okně

left_column = [
    [sg.Button("Draw lines", size=(8, 0))],
    [sg.Button("Exit", size=(8, 0))],
]

right_column = [
    [canvas],
]

layout = [
    [
        sg.Frame("Commands", left_column),
        sg.Frame("Canvas", right_column),
    ],
]

#

Vykreslení úseček na plátno.

def draw_lines(canvas):

#

reference na plátno z knihovny Tk

    tkcanvas = canvas.TKCanvas

#

úsečky s nastavenými grafickými vlastnostmi

    tkcanvas.create_line(10, 10, 90, 90)
    tkcanvas.create_line(110, 10, 190, 90, fill="#8080ff")
    tkcanvas.create_line(210, 10, 290, 90, fill="#ffff80", width=8)
    tkcanvas.create_line(310, 10, 390, 90, fill="#80aa80", width=8, dash=15)

    tkcanvas.create_line(10, 110, 90, 190, fill="red", width=12)
    tkcanvas.create_line(110, 110, 190, 190, fill="red", width=12, cap=tkinter.BUTT)
    tkcanvas.create_line(
        210, 110, 290, 190, fill="red", width=12, cap=tkinter.PROJECTING
    )
    tkcanvas.create_line(310, 110, 390, 190, fill="red", width=12, cap=tkinter.ROUND)

    tkcanvas.create_line(10, 110, 90, 190, fill="white")
    tkcanvas.create_line(110, 110, 190, 190, fill="white")
    tkcanvas.create_line(210, 110, 290, 190, fill="white")
    tkcanvas.create_line(310, 110, 390, 190, fill="white")

    tkcanvas.create_line(10, 210, 50, 290, 90, 210, fill="red", width=12)
    tkcanvas.create_line(
        110, 210, 150, 290, 190, 210, fill="red", width=12, cap=tkinter.BUTT
    )
    tkcanvas.create_line(
        210, 210, 250, 290, 290, 210, fill="red", width=12, cap=tkinter.PROJECTING
    )
    tkcanvas.create_line(
        310, 210, 350, 290, 390, 210, fill="red", width=12, cap=tkinter.ROUND
    )

#

pomocné úsečky

    tkcanvas.create_line(10, 210, 50, 290, 90, 210, fill="white")
    tkcanvas.create_line(110, 210, 150, 290, 190, 210, fill="white")
    tkcanvas.create_line(210, 210, 250, 290, 290, 210, fill="white")
    tkcanvas.create_line(310, 210, 350, 290, 390, 210, fill="white")

    tkcanvas.create_line(10, 310, 50, 390, 90, 310, fill="red", width=12)
    tkcanvas.create_line(
        110, 310, 150, 390, 190, 310, fill="red", width=12, join=tkinter.ROUND
    )
    tkcanvas.create_line(
        210, 310, 250, 390, 290, 310, fill="red", width=12, join=tkinter.BEVEL
    )
    tkcanvas.create_line(
        310, 310, 350, 390, 390, 310, fill="red", width=12, join=tkinter.MITER
    )

#

pomocné úsečky

    tkcanvas.create_line(10, 310, 50, 390, 90, 310, fill="white")
    tkcanvas.create_line(110, 310, 150, 390, 190, 310, fill="white")
    tkcanvas.create_line(210, 310, 250, 390, 290, 310, fill="white")
    tkcanvas.create_line(310, 310, 350, 390, 390, 310, fill="white")

#

vytvoření okna s ovládacími prvky

window = sg.Window("Window #35", layout, use_custom_titlebar=False, finalize=True)

#

obsluha smyčky událostí (event loop)

while True:

#

přečtení jediné události

    event, values = window.read()
    print("Event: ", event, "    Values: ", values)

#

reakce na událost “uzavření okna”

    if event in {"Exit", sg.WIN_CLOSED}:
        break
    elif event == "Draw lines":
        draw_lines(canvas)
        window.refresh()

#

po přečtení události okno zavřeme

window.close()