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  {
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   "source": [
    "# 18-09 · Система координат Canvas\n",
    "\n",
    "Практика к разделу [«Система координат Canvas»](../../site/chapters/glava-18/18-09-sistema-koordinat.html)."
   ]
  },
  {
   "cell_type": "markdown",
   "id": "a6779ca5",
   "metadata": {},
   "source": [
    "## Цель\n",
    "\n",
    "Определять направление движения курсора по координатам Canvas — Y растёт вниз."
   ]
  },
  {
   "cell_type": "markdown",
   "id": "9f983002",
   "metadata": {},
   "source": [
    "## Рабочий пример"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 1,
   "id": "ef230c21",
   "metadata": {
    "execution": {
     "iopub.execute_input": "2026-09-03T00:51:30.202583Z",
     "iopub.status.busy": "2026-09-03T00:51:30.202134Z",
     "iopub.status.idle": "2026-09-03T00:51:30.233453Z",
     "shell.execute_reply": "2026-09-03T00:51:30.231631Z"
    }
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "(40, 30) (160, 120) True\n"
     ]
    }
   ],
   "source": [
    "def event_to_point(x, y):\n",
    "    return (x, y)\n",
    "\n",
    "\n",
    "def dvizhenie_vniz(y_start, y_end):\n",
    "    \"\"\"True, если курсор сдвинулся ВНИЗ (Y увеличился) — как на Canvas, не как у Turtle.\"\"\"\n",
    "    return y_end > y_start\n",
    "\n",
    "\n",
    "p1 = event_to_point(40, 30)\n",
    "p2 = event_to_point(160, 120)\n",
    "print(p1, p2, dvizhenie_vniz(p1[1], p2[1]))"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "ef2c533c",
   "metadata": {},
   "source": [
    "## Задание ★ Базовая практика"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "id": "813fd22a",
   "metadata": {
    "execution": {
     "iopub.execute_input": "2026-09-03T00:51:30.236315Z",
     "iopub.status.busy": "2026-09-03T00:51:30.235508Z",
     "iopub.status.idle": "2026-09-03T00:51:30.242260Z",
     "shell.execute_reply": "2026-09-03T00:51:30.240634Z"
    }
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Направление определяется верно.\n"
     ]
    }
   ],
   "source": [
    "assert p1 == (40, 30)\n",
    "assert p2 == (160, 120)\n",
    "assert dvizhenie_vniz(30, 120) is True\n",
    "assert dvizhenie_vniz(120, 30) is False\n",
    "assert dvizhenie_vniz(50, 50) is False\n",
    "print(\"Направление определяется верно.\")"
   ]
  }
 ],
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