Write a programElementary20 XPExercise 8/8

Coloured rays

Task

The canvas is 400 × 400. After every click draw a line (a ray) from the centre of the canvas (200, 200) to the click. The ray's colour depends on the quarter you clicked in: top left red, top right blue, bottom left green and bottom right orange.

The program runs in a tkinter simulation right in your browser - after Run you see the window and can click it. The tests click and check what was drawn on the canvas.

Examples

Call

from tkinter import _mente as okno

kliky = [(100, 100, "red"), (300, 100, "blue"), (100, 300, "green"), (300, 300, "orange")]
for x, y, farba in kliky:
    okno.click(x, y)
ciary = okno.items("line")
okno.check("styri kliky, styri luce", len(ciary) == 4, f"ciar: {len(ciary)}")
for ciara, (x, y, farba) in zip(ciary, kliky):
    konce = {(round(ciara.coords[0]), round(ciara.coords[1])), (round(ciara.coords[-2]), round(ciara.coords[-1]))}
    okno.check(f"luc do ({x}, {y})", konce == {(200, 200), (x, y)} and okno.rgb(ciara.fill) == okno.rgb(farba),
               f"konce {sorted(konce)}, farba {ciara.fill}")

Expected output

styri kliky, styri luce: OK
luc do (100, 100): OK
luc do (300, 100): OK
luc do (100, 300): OK
luc do (300, 300): OK

After you submit, 1 hidden test will also check your solution: clicks near the centre.

Python starts the first time you run code.

import tkinter
canvas = tkinter.Canvas(width=400, height=400)
canvas.pack()
def luc(event):
    pass
canvas.bind("<Button-1>", luc)
tkinter.mainloop()

Ctrl+Enter runs the program. Tab indents. Press Esc, then Tab, to leave the editor.

Input (stdin)

Each line = one call to input().

Output

Hints

Try it yourself first. Each hint reveals a little more - and lowers the reward a little.

Signed out, hints are free - but no XP is awarded either.

Solution

The solution unlocks after the last hint.