python计算圆周长、面积、球体体积并画出圆

输入半径，计算圆的周长、面积、球体体积，并画出这个圆。
拖动条、输入框和图像控件的数据保持一致！

Fedora下测试通过

#https://github.com/RobberPhex/GTK-Example-CalcArea
from gi.repository import Gtk, Gdk, GdkPixbuf
from PIL import Image, ImageDraw
from io import BytesIO
from math import pi

class Model:
 '''
 模型类
 存储半径，计算周长、面积、体积
 '''
 def __init__(self):
 self._radius = 0
 def setRadius(self, radius):
 self._radius = float(radius)
 def getRadius(self):
 return self._radius
 def getPerimeter(self):
 return pi * self._radius * 2
 def getArea(self):
 return self._radius ** 2 * pi
 def getVolume(self):
 return 4 * pi * self._radius ** 3 / 3

class Controller:
 '''
 控制器类
 控制视图和模型的更新
 '''
 def __init__(self, model):
 self.model = model
 self._observers = []
 def addObserver(self, observer):
 self._observers.append(observer)
 def setRadius(self, radius):
 model.setRadius(radius)
 self.notify()
 def notify(self):
 for observer in self._observers:
 observer.update()

class TextView:
 '''
 文字视图类
 处理文本输入框的视图
 '''
 def __init__(self, model, rEntry, pEntry, aEntry, vEntry):
 '''
 :type model Model
 '''
 self.model = model
 self.rEntry = rEntry
 self.pEntry = pEntry
 self.aEntry = aEntry
 self.vEntry = vEntry
 def update(self):
 self.rEntry.set_text('%2.2f' % self.model.getRadius())
 self.pEntry.set_text('%2.2f' % self.model.getPerimeter())
 self.aEntry.set_text('%2.2f' % self.model.getArea())
 self.vEntry.set_text('%2.2f' % self.model.getVolume())

class ScaleView:
 '''
 拖动条视图
 处理拖动条的视图
 '''
 def __init__(self, model, scale):
 '''
 :type model Model
 '''
 self.model = model
 self.scale = scale
 def update(self):
 self.scale.set_value(self.model.getRadius())

class ImageView:
 '''
 图像视图
 处理图像的视图
 '''
 @classmethod
 def imgToPixbuf(cls, img):
 '''
 :type img Image
 '''
 buff = BytesIO()
 img.save(buff, 'ppm')
 contents = buff.getvalue()
 buff.close()
 loader = GdkPixbuf.PixbufLoader.new_with_type('pnm')
 loader.write(contents)
 pixbuf = loader.get_pixbuf()
 loader.close()
 return pixbuf
 @classmethod
 def ellipse(cls, radius):
 '''
 :type radius int
 '''
 image = Image.new("RGBA", (300, 300), "white")
 draw = ImageDraw.Draw(image)
 minor = 150 - radius
 major = 150 + radius
 draw.ellipse((minor, minor, major, major), outline='red')
 pixbuf = ImageView.imgToPixbuf(image)
 return pixbuf
 def __init__(self, model, image):
 self.model = model
 self.image = image
 def update(self):
 radius = self.model.getRadius()
 pixbuf = ImageView.ellipse(radius)
 self.image.set_from_pixbuf(pixbuf)

class MainWindow(Gtk.Window):
 '''
 主窗口类
 负责整体界面的显示
 '''
 def textCallback(self, widget, controller):
 '''
 文本输入回调
 '''
 try:
 radius = float(widget.get_text())
 controller.setRadius(radius)
 except ValueError as e:
 pass
 def scaleCallback(self, widget, controller):
 '''
 拖动条回调
 '''
 radius = widget.get_value()
 controller.setRadius(radius)
 def __init__(self):
 Gtk.Window.__init__(self, title="Title")
 self.set_default_size(600, 400)
 self.set_position(Gtk.WindowPosition.CENTER)
 hbox = Gtk.HBox(spacing=5)
 self.add(hbox)
 vbox = Gtk.VBox(spacing=5)
 hbox.pack_start(vbox, True, True, 2)
 table = Gtk.Table.new(4, 2, False)
 vbox.pack_start(table, True, True, 2)
 label = Gtk.Label('半径：')
 table.attach_defaults(label, 0, 1, 0, 1)
 label = Gtk.Label('周长：')
 table.attach_defaults(label, 0, 1, 1, 2)
 label = Gtk.Label('面积：')
 table.attach_defaults(label, 0, 1, 2, 3)
 label = Gtk.Label('体积：')
 table.attach_defaults(label, 0, 1, 3, 4)
 self.radiusEntry = Gtk.Entry.new()
 self.radiusEntry.connect('changed', self.textCallback, controller)
 table.attach_defaults(self.radiusEntry, 1, 2, 0, 1)
 self.perimeterEntry = Gtk.Entry.new()
 self.perimeterEntry.set_sensitive(False)
 self.perimeterEntry.set_text('周长')
 table.attach_defaults(self.perimeterEntry, 1, 2, 1, 2)
 self.areaEntry = Gtk.Entry.new()
 self.areaEntry.set_sensitive(False)
 self.areaEntry.set_text('面积')
 table.attach_defaults(self.areaEntry, 1, 2, 2, 3)
 self.volumeEntry = Gtk.Entry.new()
 self.volumeEntry.set_sensitive(False)
 self.volumeEntry.set_text('体积')
 table.attach_defaults(self.volumeEntry, 1, 2, 3, 4)
 self.scale = Gtk.HScale.new_with_range(0, 100, 1)
 self.scale.connect('value-changed', self.scaleCallback, controller)
 vbox.pack_start(self.scale, False, False, 2)
 pixbuf = GdkPixbuf.Pixbuf.new(GdkPixbuf.Colorspace.RGB, True, 8, 300, 300)
 pixbuf.fill(0xaaaaaaaa)
 self.image = Gtk.Image.new_from_pixbuf(pixbuf)
 hbox.pack_start(self.image, True, True, 2)
 self.connect('delete-event', Gtk.main_quit)

model = Model()
controller = Controller(model)
if __name__ == '__main__':
 Gdk.threads_init()
 Gdk.threads_enter()
 win = MainWindow()
 iv = ImageView(model, win.image)
 controller.addObserver(iv)
 tv = TextView(model, win.radiusEntry, win.perimeterEntry, win.areaEntry, win.volumeEntry)
 controller.addObserver(tv)
 sv = ScaleView(model, win.scale)
 controller.addObserver(sv)
 win.show_all()
 Gtk.main()
 Gdk.threads_leave()

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