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  {
   "cell_type": "markdown",
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   "source": [
    "# 18-02 · Холст (Canvas)\n",
    "\n",
    "Практика к разделу [«Настраиваем экран. Создаём холст»](../../site/chapters/glava-18/18-02-ekran-holst.html)."
   ]
  },
  {
   "cell_type": "markdown",
   "id": "ddacbea8",
   "metadata": {},
   "source": [
    "## Цель\n",
    "\n",
    "Создать Canvas и нарисовать на нём вручную."
   ]
  },
  {
   "cell_type": "markdown",
   "id": "f5650ea8",
   "metadata": {},
   "source": [
    "## Про mainloop() и события мыши в этом ноутбуке\n",
    "\n",
    "Вместо `root.mainloop()` здесь используется `root.update()` + `root.destroy()`. А вместо настоящих кликов мышью мы вызываем функции-обработчики напрямую с маленьким объектом `FakeEvent(x, y)` вместо настоящего события — Tkinter в реальном приложении передаёт объект с такими же полями `.x`/`.y`, так что код обработчиков проверяется по-настоящему."
   ]
  },
  {
   "cell_type": "markdown",
   "id": "2f8024b7",
   "metadata": {},
   "source": [
    "## Рабочий пример"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 1,
   "id": "00a4096d",
   "metadata": {
    "execution": {
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     "iopub.status.busy": "2026-08-14T21:02:31.026760Z",
     "iopub.status.idle": "2026-08-14T21:02:31.151988Z",
     "shell.execute_reply": "2026-08-14T21:02:31.151528Z"
    }
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Фигур на холсте: 1\n"
     ]
    }
   ],
   "source": [
    "import tkinter as tk\n",
    "\n",
    "root = tk.Tk()\n",
    "canvas = tk.Canvas(root, width=600, height=400, bg=\"white\")\n",
    "canvas.pack()\n",
    "\n",
    "canvas.create_line(10, 10, 100, 100, fill=\"black\", width=2)\n",
    "print(\"Фигур на холсте:\", len(canvas.find_all()))\n",
    "root.update()\n",
    "root.destroy()"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "416a1965",
   "metadata": {},
   "source": [
    "## Задание ★ Базовая практика\n",
    "\n",
    "Нарисуйте прямоугольник и овал прямо командами create_rectangle/create_oval."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "id": "a30b3b04",
   "metadata": {
    "execution": {
     "iopub.execute_input": "2026-08-14T21:02:31.153153Z",
     "iopub.status.busy": "2026-08-14T21:02:31.153014Z",
     "iopub.status.idle": "2026-08-14T21:02:31.219348Z",
     "shell.execute_reply": "2026-08-14T21:02:31.218731Z"
    }
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Фигур на холсте: 2\n"
     ]
    }
   ],
   "source": [
    "root = tk.Tk()\n",
    "canvas = tk.Canvas(root, width=600, height=400, bg=\"white\")\n",
    "\n",
    "canvas.create_rectangle(50, 50, 150, 120, outline=\"red\", width=3)\n",
    "canvas.create_oval(200, 50, 300, 150, outline=\"blue\", width=3)\n",
    "\n",
    "print(\"Фигур на холсте:\", len(canvas.find_all()))\n",
    "root.update()\n",
    "root.destroy()"
   ]
  }
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