【下载文档:  python计算圆周长、面积、球体体积并画出圆.txt 】

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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
复制代码 代码如下:#http://github.com/RobberPhex/GTK-Example-CalcAreafrom gi.repository import Gtk, Gdk, GdkPixbuffrom PIL import Image, ImageDrawfrom io import BytesIOfrom 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()