What is equivalent to root.update() of tkinter in Kivy? Tks

[alam....@gmail.com]

Dear Friends

I want to draw x, y coordinates of line with the data from serial port. However, the coordinates are available but there is no update on the GUI (graphics). How to update it similar to <root.update()> tkinter?

Thanks

File: sample.kv 

***************************************************************************

<MyScreenManager>:

Home:

name: 'Home'

<Home>:

name: 'Home'

BoxLayout:

orientation: 'vertical'

BoxLayout: 

size_hint_y: 50

orientation: 'horizontal'

Button: 

id: road

text: 'Plot'

font_size: 25

background_color: 0,0,1,1

on_release: app.root.plot()

BoxLayout:

size_hint_y: 1000

orientation: 'horizontal'

BoxLayout:

size_hint: 0.9, 1

orientation: 'horizontal'

Widget:

id: my_can5

x0: self.width*.02

y0: self.height/3

my_clr: 0,1,0,1

mi_pts: 875, 0, 200, 0

canvas:

Color:

rgba: self.my_clr

Line:

points: self.mi_pts

width: 3

***************************************************************************

***************************************************************************

File: sample.py

***************************************************************************

class MyScreenManager(ScreenManager):

    def plot(self):

        print "In"

        i = 1

        x0 = 875

        y0 = 900

        x1 = 550

        y1 = 925

        inVoltS = serial.Serial('/dev/tty.usbmodem1411', 9600)

        while i > 0:

            inVoltR = float(inVoltS.readline()) # Read the newest output from the Arduino         

            inVolt = inVoltR * 100

            print "Yes", inVolt

            x1 = x1 + 1

            y1 = y1 + inVolt

            newPoint = self.get_screen('Home').ids.my_can5.mi_pts = (x0,y0,x1,y1)

            print newPoint

            x0 = x1

            y0 = y1

            sleep(1)

            i = i + 1

#***************** APP OBJECT ***********************

class zAmpleApp(App):

    def build(self):

        return MyScreenManager()

if __name__ == '__main__':

    zAmpleApp().run()

[Ivan Acevedo]

Do not use a "while" to create an infinite loop, the application will block, use:

Clock.schedule_interval()

[Hilaal Alam]

Thank you Ivan. I will try

On 4 Feb 2017, at 7:12 PM, Ivan Acevedo <ivanla...@gmail.com> wrote:

Do not use a "while" to create an infinite loop, the application will block, use:

Clock.schedule_interval()

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