我正在尝试制作一个可以计算圆锥体积的应用程序(到目前为止)。
我有一个名为 ConeVolumeScreen 的屏幕,其中有两个 TextInput 小部件。
<ConeVolumeScreen>:
BoxLayout:
orientation: ...
padding: ...
spacing: ...
Label:
text: 'Radius:'
TextInput:
id: cone_vol_radius
multiline: False
input_type: 'number'
Label:
text: 'Height:'
TextInput:
id: cone_vol_height
multiline: False
input_type: 'number'
Button:
text: 'Solve'
on_release: app.root.changeScreen('solve cone volume')
人们应该将圆锥体的半径和高度输入到这两个小部件中。然后,用户可以单击按钮转到名为 SolveConeVolumeScreen 的下一个屏幕。在此屏幕中,有一个标签,应打印该人指定的圆锥体的体积。
<SolveConeVolumeScreen>:
BoxLayout:
orientation: ...
padding: ...
spacing: ...
Label:
text: app.getConeVolume(cone_vol_radius, cone_vol_height)
getConeVolume() 是这里的一个方法
class CalculatorRoot(BoxLayout):
def __init__(self, **kwargs):
super(CalculatorRoot, self).__init__(**kwargs)
self.screen_list = []
def changeScreen(self, next_screen):
if self.ids.calc_screen_manager.current not in self.screen_list:
self.screen_list.append(self.ids.calc_screen_manager.current)
if next_screen == 'volume':
self.ids.calc_screen_manager.current = 'volume_screen'
elif next_screen == 'area_screen':
self.ids.calc_screen_manager.current = 'area_screen'
elif next_screen == 'surface area':
self.ids.calc_screen_manager.current = 'surfarea_screen'
elif next_screen == 'cone volume':
self.ids.calc_screen_manager.current = 'coneVolume_screen'
elif next_screen == 'solve cone volume':
self.ids.calc_screen_manager.current = 'solveConeVolume_screen'
elif next_screen == 'rectangular based pyramid volume':
self.ids.calc_screen_manager.current = 'rectPyramidVolume_screen'
def onBackButton(self):
if self.screen_list:
self.ids.calc_screen_manager.current = self.screen_list.pop()
return True
return False
class CalculatorApp(App):
def __init__(self, **kwargs):
super(CalculatorApp, self).__init__(**kwargs)
Window.bind(on_keyboard=self.onBackButton)
def onBackButton(self, window, key, *args):
if key == 27:
return self.root.onBackButton()
def build(self):
return CalculatorRoot()
def getConeVolume(self, r, h):
first_step = 'π * ' + str(r) + '^2 * ' + str(h) + ' / 3\n'
rr = round(r * r, 2)
second_step = 'π * ' + str(rr) + ' * ' + str(h) + ' / 3\n'
rh = round(rr * h, 2)
third_step = 'π * ' + str(rh) + ' / 3\n'
pirh = round(pi * rh, 2)
fourth_step = str(pirh) + ' / 3\n'
result = round(pi * rh, 2)
final_step = 'The answer is ' + str(result) + '.'
thing = first_step + second_step + third_step + fourth_step + final_step
return thing
但错误表明cone_vol_radius 未定义。
...
128: spacing: min(root.width, root.height) * .02
129: Label:
130:文本:app.getConeVolume(cone_vol_radius,cone_vol_height)
131:
132::
...
BuilderException:解析器:文件“/Users/fayzulloh/Desktop/Calculator App/calculator.kv”,第 130 行:
...
128: 间距: min(root.width, root.height) * .02
129:标签:
130:文本:app.getConeVolume(cone_vol_radius,cone_vol_height)
131:
132::
...
名称错误:名称“cone_vol_radius”未定义
请帮忙。我真的很感激任何建议。
这是我的屏幕管理器
<CalculatorRoot>:
orientation: "vertical"
ScreenManager:
id: calc_screen_manager
StartScreen:
name: 'start_screen'
VolumeScreen:
id: volume_screen
name: 'volume_screen'
AreaScreen:
id: area_screen
name: 'area_screen'
SurfaceAreaScreen:
id: surfarea_screen
name: 'surfarea_screen'
ConeVolumeScreen:
id: coneVolume_screen
name: 'coneVolume_screen'
SolveConeVolumeScreen:
id: solveConeVolume_screen
name: 'solveConeVolume_screen'
RectPyramidVolumeScreen:
id: rectPyramidVolume_screen
name: 'rectPyramidVolume_screen'