How to create a dynamic widget in canvas?

[Prabhat K.C.]

I am trying to make a rectangle that would enlarge or shrink at the run time. Either by taking a value from a slider, or manual input. I am not quite sure what to do. I would appreciate if someone guided me what to do with my Python file, and my Kivy file.

[Prabhat K.C.]

<InterLength>
    FloatLayout:
        canvas:

            Rectangle:
                size: self.size
                pos: self.pos
                source: 'bgnd.jpg'
            Color:
                rgba: 0,0.5,0.5,1
            Rectangle:
                id: rect1
                size: (15,50)
                pos: (50,450)
            Color:
                rgba: 0.2,1,0.2,1
            Rectangle:
                id: rect2
                size: (105,50)
                pos:(50,250)
        FloatLayout:
            Slider:
                id: slider
                min: 0
                max: 50
                step: 1
                orientation: 'horizontal'
                pos_hint: {"x": 0.004, "top": 0.73}

                Label:
                    text: str(slider.value)

[Elliot Garbus]

There are a number of things gong on here that are not quite correct. 

You have a label in a slider.  You have assigned ids to drawing instructions in the canvas.  Ids are for widgets.

 

I put the canvas in the Slider widget and use self.value to change the size of the drawn objects.

 

from kivy.app import App
from kivy.lang import Builder

kv = """
<InterLength@BoxLayout>:
    orientation: 'vertical' 
    canvas:
        Color:
            rgba: .5, .5, .5, 1

        Rectangle:
            size: self.size
            pos: self.pos
            source: 'bgnd.jpg'

    Slider:
        size_hint_y: .25

        id: slider
        min: 0
        max: 50
        step: 1
        orientation: 'horizontal'

        canvas:
            Color:
                rgba: 0,0.5,0.5,1
            Rectangle:
                size: (15 + self.value * 20, 50)
                pos: (50 ,450)
            Color:
                rgba: 0.2,1,0.2,1
            Rectangle:
                size: (105, 50 + self.value * 5)
                pos:(50,250)
    Label:
        text: str(slider.value)
        font_size: 40
    Label:
        text: 'Slider Value Test'
                   
   
InterLength:

"""


class SizeBoxApp(App):
    def build(self):
        return Builder.load_string(kv)


SizeBoxApp().run()

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[Prabhat K.C.]

Late thank you, had to get away from my laptop for a bit. but much appreciated.