Quiz7.ipynb

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    "# Defines two classes, Point() and Disk().\n",
    "# The latter has an \"area\" attribute and three methods:\n",
    "# - change_radius(r)\n",
    "# - intersects(disk), that returns True or False depending on whether\n",
    "#   the disk provided as argument intersects the disk object.\n",
    "# - absorb(disk), that returns a new disk object that represents the smallest\n",
    "#   disk that contains both the disk provided as argument and the disk object.\n",
    "#\n",
    "# Written by *** and Eric Martin for COMP9021\n",
    "\n",
    "\n",
    "from math import pi, hypot\n",
    "\n",
    "\n",
    "class Point:\n",
    "    def __init__(self, x = 0, y = 0):\n",
    "        self.x = x\n",
    "        self.y = y\n",
    "\n",
    "    def __repr__(self):\n",
    "        return f'Point({self.x:.2f}, {self.y:.2f})'\n",
    "\n",
    "class Disk:\n",
    "    def __init__(self,*,centre = Point(),radius = 0.00):\n",
    "        self.centre = centre\n",
    "        self.radius = radius\n",
    "        self.area = pi * self.radius * self.radius\t\t\n",
    "\n",
    "    def __str__(self):\n",
    "        return f'Disk({self.centre}, {self.radius:.2f})'\n",
    "\t\n",
    "    def intersects(self,disk):\n",
    "        distance = hypot((self.centre.x-disk.centre.x),(self.centre.y-disk.centre.y))\n",
    "        if distance <= (self.radius + disk.radius):\n",
    "            return True\n",
    "        else:\n",
    "            return False\n",
    "\t\n",
    "    def absorb(self,disk):\n",
    "        x0 = 0\n",
    "        x1 = 0\n",
    "        y0 = 0\n",
    "        y1 = 0\n",
    "        d = hypot((self.centre.x-disk.centre.x),(self.centre.y-disk.centre.y))\n",
    "        # print(d)\n",
    "        # print(abs(self.radius - disk.radius))\n",
    "        if d > abs(self.radius - disk.radius):\n",
    "            if self.centre.x <= disk.centre.x and self.centre.y < disk.centre.y:\n",
    "                x0 = self.centre.x - (self.radius / d)*(disk.centre.x - self.centre.x)\n",
    "                y0 = self.centre.y - (self.radius / d)*(disk.centre.y - self.centre.y)\n",
    "                x1 = disk.centre.x + (disk.radius / d)*(disk.centre.x - self.centre.x)\n",
    "                y1 = disk.centre.y + (disk.radius / d)*(disk.centre.y - self.centre.y)\n",
    "            if self.centre.x > disk.centre.x and self.centre.y <= disk.centre.y:\n",
    "                x0 = self.centre.x + (self.radius / d)*(self.centre.x - disk.centre.x)\n",
    "                y0 = self.centre.y - (self.radius / d)*(disk.centre.y - self.centre.y)\n",
    "                x1 = disk.centre.x - (disk.radius / d)*(self.centre.x - disk.centre.x)\n",
    "                y1 = disk.centre.y + (disk.radius / d)*(disk.centre.y - self.centre.y)\n",
    "            if self.centre.x >= disk.centre.x and self.centre.y > disk.centre.y:\n",
    "                x0 = self.centre.x + (self.radius / d)*(self.centre.x - disk.centre.x)\n",
    "                y0 = self.centre.y + (self.radius / d)*(self.centre.y - disk.centre.y)\n",
    "                x1 = disk.centre.x - (disk.radius / d)*(self.centre.x - disk.centre.x)\n",
    "                y1 = disk.centre.y - (disk.radius / d)*(self.centre.y - disk.centre.y)\n",
    "            if self.centre.x < disk.centre.x and self.centre.y >= disk.centre.y:\n",
    "                x0 = self.centre.x - (self.radius / d)*(disk.centre.x - self.centre.x)\n",
    "                y0 = self.centre.y + (self.radius / d)*(self.centre.y - disk.centre.y)\n",
    "                x1 = disk.centre.x + (disk.radius / d)*(disk.centre.x - self.centre.x)\n",
    "                y1 = disk.centre.y - (disk.radius / d)*(self.centre.y - disk.centre.y)\n",
    "            if self.centre.x == disk.centre.x and self.centre.y == disk.centre.y:\n",
    "                x0 = self.centre.x \n",
    "                y0 = self.centre.y \n",
    "                x1 = disk.centre.x \n",
    "                y1 = disk.centre.y \n",
    "            # print(x0,y0,x1,y1)\n",
    "            x_mid = (x0 + x1)/2\n",
    "            y_mid = (y0 + y1)/2\n",
    "            self.r = (d + self.radius + disk.radius)/2\n",
    "        else:\n",
    "            if self.radius >= disk.radius:\n",
    "                x_mid = self.centre.x\n",
    "                y_mid = self.centre.y\n",
    "                self.r = self.radius\n",
    "            else:\n",
    "                x_mid = disk.centre.x\n",
    "                y_mid = disk.centre.y\n",
    "                self.r = disk.radius\n",
    "        self.cent = Point(x = x_mid,y = y_mid)\n",
    "        return Disk(centre = self.cent, radius =self.r)\n",
    "\t\n",
    "    def change_radius(self, radius):\n",
    "        self.radius = radius        \n",
    "        self.area = pi * radius * radius\n",
    "# disk1 = Disk(centre = Point(x = -2,y = 0),radius = 4)\n",
    "# disk1.change_radius(5)\n",
    "# print(disk1)\n",
    "# disk2 = Disk(centre = Point(x = 1,y = 2),radius = 6)\t\t\n",
    "# disk3 = disk2.absorb(disk1)\t\t\n",
    "# print(disk3)            "
   ]
  }
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