python计算圆柱体积_python计算圆周长、面积、球体体积并画出圆

#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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