不能在MainWindow上显示车速表(kivy) [英] Cant display speedometer on MainWindow (kivy)

问题描述

我正在尝试在MainWindow屏幕上显示车速表.现在，当我运行代码时，速度计可以正常工作，但我希望它没有显示在MainWindow屏幕上，而只是出现在普通屏幕上.可以将class Gauge(Widget):和class MainWindow(Screen):组合在一起，以便车速表实际显示在MainWindow上吗?

I am trying to display the speedometer in my MainWindow screen. Right now when i run the code, the speedometer works but it is not displayed on the MainWindow screen which i want rather it is just appearing on a normal screen. It is possible to combine class Gauge(Widget): and class MainWindow(Screen): together so that the speedometer will actually be displayed on the MainWindow?

.py文件

import kivy
kivy.require('1.6.0')
from kivy.app import App
from kivy.clock import Clock
from kivy.properties import NumericProperty
from kivy.properties import StringProperty
from kivy.properties import BoundedNumericProperty
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.widget import Widget
from kivy.uix.scatter import Scatter
from kivy.uix.image import Image
from kivy.uix.label import Label
from kivy.uix.progressbar import ProgressBar
from os.path import join, dirname, abspath
from kivy.uix.screenmanager import Screen, ScreenManager

class WindowManager(ScreenManager):
    pass

class MainWindow(Screen):
    pass

class Gauge(Widget):

    unit = NumericProperty(1.8)
    value = BoundedNumericProperty(0, min=0, max=100, errorvalue=0)
    path = dirname(abspath(__file__))
    file_gauge = StringProperty(join(path, "cadran.png"))
    file_needle = StringProperty(join(path, "needle.png"))
    size_gauge = BoundedNumericProperty(128, min=128, max=256, errorvalue=128)
    size_text = NumericProperty(10)

    def __init__(self, **kwargs):
        super(Gauge, self).__init__(**kwargs)

        self._gauge = Scatter(
            size=(1350,600),
            do_rotation=False,
            do_scale=False,
            do_translation=False
        )

        _img_gauge = Image(
            source=self.file_gauge,
            size=(1350,600)

        )

        self._needle = Scatter(
            size=(self.size_gauge, self.size_gauge),
            do_rotation=False,
            do_scale=False,
            do_translation=False
        )

        _img_needle = Image(
            source=self.file_needle,
            size=(self.size_gauge, self.size_gauge)
        )

        self._glab = Label(font_size=self.size_text, markup=True)
        self._progress = ProgressBar(max=100, height=20, value=self.value , size=(500,400))

        self._gauge.add_widget(_img_gauge)
        self._needle.add_widget(_img_needle)

        self.add_widget(self._gauge)
        self.add_widget(self._needle)
        self.add_widget(self._glab)
        self.add_widget(self._progress)

        self.bind(pos=self._update)
        self.bind(size=self._update)
        self.bind(value=self._turn)

    def _update(self, *args):
        '''
        Update gauge and needle positions after sizing or positioning.
        '''
        self._gauge.pos = self.pos
        self._needle.pos = (self.x, self.y)
        self._needle.center = self._gauge.center
        self._glab.center_x = self._gauge.center_x
        self._glab.center_y = self._gauge.center_y + (self.size_gauge / 4)
        self._progress.x = self._gauge.x + (self.size_gauge/0.468 )
        self._progress.y = self._gauge.y + (self.size_gauge/4 )
        self._progress.width = self.size_gauge

    def _turn(self, *args):
        '''
        Turn needle, 1 degree = 1 unit, 0 degree point start on 50 value.
        '''
        self._needle.center_x = self._gauge.center_x
        self._needle.center_y = self._gauge.center_y
        self._needle.rotation = (50 * self.unit) - (self.value * self.unit)
        self._glab.text = "[b]{0:.0f}[/b]".format(self.value)
        self._progress.value = self.value


class GaugeApp(App):
    increasing = NumericProperty(1)
    begin = NumericProperty(50)
    step = NumericProperty(1)

    def build(self):
        box = BoxLayout(orientation='horizontal', padding=5)
        self.gauge = Gauge(value=50, size_gauge=256, size_text=25)

        box.add_widget(self.gauge)
        Clock.schedule_interval(lambda *t: self.gauge_increment(), 0.05)
        return box

    def gauge_increment(self):
        begin = self.begin
        begin += self.step * self.increasing
        if begin > 0 and begin < 100:
            self.gauge.value = begin
        else:
            self.increasing *= -1
        self.begin = begin


if __name__ == '__main__':
    GaugeApp().run()

推荐答案

您需要创建一个ScreenManager实例和一个Screen实例.接下来，将屏幕添加到屏幕管理器，然后将屏幕添加到屏幕添加框

You need to create an instance of ScreenManager and an instance of Screen. Next you add_widget the Screen to ScreenManager and to the Screen you add box

sm = ScreenManager()
s1 = Screen()
s1.add_widget(box)
sm.add_widget(s1)

这是使用您的新类的完整代码

This is the complete code which uses your new classes

from kivy.app import App
from kivy.clock import Clock
from kivy.properties import NumericProperty
from kivy.properties import StringProperty
from kivy.properties import BoundedNumericProperty
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.widget import Widget
from kivy.uix.scatter import Scatter
from kivy.uix.image import Image
from kivy.uix.label import Label
from kivy.uix.progressbar import ProgressBar
from os.path import join, dirname, abspath
from kivy.uix.screenmanager import Screen, ScreenManager

class WindowManager(ScreenManager):
    pass

class MainWindow(Screen):
    pass

class Gauge(Widget):

    unit = NumericProperty(1.8)
    value = BoundedNumericProperty(0, min=0, max=100, errorvalue=0)
    path = dirname(abspath(__file__))
    file_gauge = StringProperty(join(path, "cadran.png"))
    file_needle = StringProperty(join(path, "needle.png"))
    size_gauge = BoundedNumericProperty(128, min=128, max=256, errorvalue=128)
    size_text = NumericProperty(10)

    def __init__(self, **kwargs):
        super(Gauge, self).__init__(**kwargs)

        self._gauge = Scatter(
            size=(1350,600),
            do_rotation=False,
            do_scale=False,
            do_translation=False
        )

        _img_gauge = Image(
            source=self.file_gauge,
            size=(1350,600)

        )

        self._needle = Scatter(
            size=(self.size_gauge, self.size_gauge),
            do_rotation=False,
            do_scale=False,
            do_translation=False
        )

        _img_needle = Image(
            source=self.file_needle,
            size=(self.size_gauge, self.size_gauge)
        )

        self._glab = Label(font_size=self.size_text, markup=True)
        self._progress = ProgressBar(max=100, height=20, value=self.value , size=(500,400))

        self._gauge.add_widget(_img_gauge)
        self._needle.add_widget(_img_needle)

        self.add_widget(self._gauge)
        self.add_widget(self._needle)
        self.add_widget(self._glab)
        self.add_widget(self._progress)

        self.bind(pos=self._update)
        self.bind(size=self._update)
        self.bind(value=self._turn)

    def _update(self, *args):
        '''
        Update gauge and needle positions after sizing or positioning.
        '''
        self._gauge.pos = self.pos
        self._needle.pos = (self.x, self.y)
        self._needle.center = self._gauge.center
        self._glab.center_x = self._gauge.center_x
        self._glab.center_y = self._gauge.center_y + (self.size_gauge / 4)
        self._progress.x = self._gauge.x + (self.size_gauge/0.468 )
        self._progress.y = self._gauge.y + (self.size_gauge/4 )
        self._progress.width = self.size_gauge

    def _turn(self, *args):
        '''
        Turn needle, 1 degree = 1 unit, 0 degree point start on 50 value.
        '''
        self._needle.center_x = self._gauge.center_x
        self._needle.center_y = self._gauge.center_y
        self._needle.rotation = (50 * self.unit) - (self.value * self.unit)
        self._glab.text = "[b]{0:.0f}[/b]".format(self.value)
        self._progress.value = self.value


class GaugeApp(App):
    increasing = NumericProperty(1)
    begin = NumericProperty(50)
    step = NumericProperty(1)

    def build(self):
        box = BoxLayout(orientation='horizontal', padding=5)
        self.gauge = Gauge(value=50, size_gauge=256, size_text=25)

        box.add_widget(self.gauge)
        Clock.schedule_interval(lambda *t: self.gauge_increment(), 0.05)

        sm = WindowManager()
        s1 = MainWindow()
        s1.add_widget(box)
        sm.add_widget(s1)

        return sm

    def gauge_increment(self):
        begin = self.begin
        begin += self.step * self.increasing
        if begin > 0 and begin < 100:
            self.gauge.value = begin
        else:
            self.increasing *= -1
        self.begin = begin


if __name__ == '__main__':
    GaugeApp().run()

这篇关于不能在MainWindow上显示车速表(kivy)的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！