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<BR>from gi.repository import Gtk, Gdk, GdkPixbuf<BR>from PIL import Image, ImageDraw<BR>from io import BytesIO<BR>from math import pi</P><P>class Model:<BR>    '''<BR>    模型类<BR>    存储半径，计算周长、面积、体积<BR>    '''</P><P>    def __init__(self):<BR>        self._radius = 0</P><P>    def setRadius(self, radius):<BR>        self._radius = float(radius)</P><P>    def getRadius(self):<BR>        return self._radius</P><P>    def getPerimeter(self):<BR>        return pi * self._radius * 2</P><P>    def getArea(self):<BR>        return self._radius ** 2 * pi</P><P>    def getVolume(self):<BR>        return 4 * pi * self._radius ** 3 / 3</P><P><BR>class Controller:<BR>    '''<BR>    控制器类<BR>    控制视图和模型的更新<BR>    '''</P><P>    def __init__(self, model):<BR>        self.model = model<BR>        self._observers = []</P><P>    def addObserver(self, observer):<BR>        self._observers.append(observer)</P><P>    def setRadius(self, radius):<BR>        model.setRadius(radius)<BR>        self.notify()</P><P>    def notify(self):<BR>        for observer in self._observers:<BR>            observer.update()</P><P><BR>class TextView:<BR>    '''<BR>    文字视图类<BR>    处理文本输入框的视图<BR>    '''</P><P>    def __init__(self, model, rEntry, pEntry, aEntry, vEntry):<BR>        '''<BR>        :type model Model<BR>        '''<BR>        self.model = model<BR>        self.rEntry = rEntry<BR>        self.pEntry = pEntry<BR>        self.aEntry = aEntry<BR>        self.vEntry = vEntry</P><P>    def update(self):<BR>        self.rEntry.set_text('%2.2f' % self.model.getRadius())<BR>        self.pEntry.set_text('%2.2f' % self.model.getPerimeter())<BR>        self.aEntry.set_text('%2.2f' % self.model.getArea())<BR>        self.vEntry.set_text('%2.2f' % self.model.getVolume())</P><P><BR>class ScaleView:<BR>    '''<BR>    拖动条视图<BR>    处理拖动条的视图<BR>    '''</P><P>    def __init__(self, model, scale):<BR>        '''<BR>        :type model Model<BR>        '''<BR>        self.model = model<BR>        self.scale = scale</P><P>    def update(self):<BR>        self.scale.set_value(self.model.getRadius())</P><P><BR>class ImageView:<BR>    '''<BR>    图像视图<BR>    处理图像的视图<BR>    '''</P><P>    @classmethod<BR>    def imgToPixbuf(cls, img):<BR>        '''<BR>        :type img Image<BR>        '''<BR>        buff = BytesIO()<BR>        img.save(buff, 'ppm')<BR>        contents = buff.getvalue()<BR>        buff.close()</P><P>        loader = GdkPixbuf.PixbufLoader.new_with_type('pnm')<BR>        loader.write(contents)<BR>        pixbuf = loader.get_pixbuf()<BR>        loader.close()<BR>        return pixbuf</P><P>    @classmethod<BR>    def ellipse(cls, radius):<BR>        '''<BR>        :type radius int<BR>        '''<BR>        image = Image.new("RGBA", (300, 300), "white")<BR>        draw = ImageDraw.Draw(image)<BR>        minor = 150 - radius<BR>        major = 150 + radius<BR>        draw.ellipse((minor, minor, major, major), outline='red')<BR>        pixbuf = ImageView.imgToPixbuf(image)<BR>        return pixbuf</P><P>    def __init__(self, model, image):<BR>        self.model = model<BR>        self.image = image</P><P>    def update(self):<BR>        radius = self.model.getRadius()<BR>        pixbuf = ImageView.ellipse(radius)<BR>        self.image.set_from_pixbuf(pixbuf)</P><P><BR>class MainWindow(Gtk.Window):<BR>    '''<BR>    主窗口类<BR>    负责整体界面的显示<BR>    '''</P><P>    def textCallback(self, widget, controller):<BR>        '''<BR>        文本输入回调<BR>        '''<BR>        try:<BR>            radius = float(widget.get_text())<BR>            controller.setRadius(radius)<BR>        except ValueError as e:<BR>            pass</P><P>    def scaleCallback(self, widget, controller):<BR>        '''<BR>        拖动条回调<BR>        '''<BR>        radius = widget.get_value()<BR>        controller.setRadius(radius)</P><P>    def __init__(self):<BR>        Gtk.Window.__init__(self, title="Title")</P><P>        self.set_default_size(600, 400)<BR>        self.set_position(Gtk.WindowPosition.CENTER)</P><P>        hbox = Gtk.HBox(spacing=5)<BR>        self.add(hbox)</P><P>        vbox = Gtk.VBox(spacing=5)<BR>        hbox.pack_start(vbox, True, True, 2)</P><P>        table = Gtk.Table.new(4, 2, False)<BR>        vbox.pack_start(table, True, True, 2)</P><P>        label = Gtk.Label('半径：')<BR>        table.attach_defaults(label, 0, 1, 0, 1)<BR>        label = Gtk.Label('周长：')<BR>        table.attach_defaults(label, <span>本文来源gaodai#ma#com搞*!代#%^码$网*</span>0, 1, 1, 2)<BR>        label = Gtk.Label('面积：')<BR>        table.attach_defaults(label, 0, 1, 2, 3)<BR>        label = Gtk.Label('体积：')<BR>        table.attach_defaults(label, 0, 1, 3, 4)</P><P>        self.radiusEntry = Gtk.Entry.new()<BR>        self.radiusEntry.connect('changed', self.textCallback, controller)<BR>        table.attach_defaults(self.radiusEntry, 1, 2, 0, 1)<BR>        self.perimeterEntry = Gtk.Entry.new()<BR>        self.perimeterEntry.set_sensitive(False)<BR>        self.perimeterEntry.set_text('周长')<BR>        table.attach_defaults(self.perimeterEntry, 1, 2, 1, 2)<BR>        self.areaEntry = Gtk.Entry.new()<BR>        self.areaEntry.set_sensitive(False)<BR>        self.areaEntry.set_text('面积')<BR>        table.attach_defaults(self.areaEntry, 1, 2, 2, 3)<BR>        self.volumeEntry = Gtk.Entry.new()<BR>        self.volumeEntry.set_sensitive(False)<BR>        self.volumeEntry.set_text('体积')<BR>        table.attach_defaults(self.volumeEntry, 1, 2, 3, 4)</P><P>        self.scale = Gtk.HScale.new_with_range(0, 100, 1)<BR>        self.scale.connect('value-changed', self.scaleCallback, controller)<BR>        vbox.pack_start(self.scale, False, False, 2)</P><P>        pixbuf = GdkPixbuf.Pixbuf.new(GdkPixbuf.Colorspace.RGB, True, 8, 300, 300)<BR>        pixbuf.fill(0xaaaaaaaa)<BR>        self.image = Gtk.Image.new_from_pixbuf(pixbuf)<BR>        hbox.pack_start(self.image, True, True, 2)</P><P>        self.connect('delete-event', Gtk.main_quit)</P><P><BR>model = Model()<BR>controller = Controller(model)</P><P>if __name__ == '__main__':<BR>    Gdk.threads_init()<BR>    Gdk.threads_enter()<BR>    win = MainWindow()</P><P>    iv = ImageView(model, win.image)<BR>    controller.addObserver(iv)</P><P>    tv = TextView(model, win.radiusEntry, win.perimeterEntry, win.areaEntry, win.volumeEntry)<BR>    controller.addObserver(tv)</P><P>    sv = ScaleView(model, win.scale)<BR>    controller.addObserver(sv)</P><P>    win.show_all()<BR>    Gtk.main()<BR>    Gdk.threads_leave()<BR>

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