Kivy Image Widget On Scatter Layout: How Do I Increase Image Size? - kivy

Question

I want to use Kivy to rotate an image of a 45RPM record. I discovered that this can be done using an image widget on a scatter layout. However I can't seem to find the code to make the image of the 45RPM record be resized to match the size of the window. I've tried for hours different iterations of code and I've become quite frustrated. Full code below with link to image.
Any Suggestions?
Appreciated In Advance.
....brad....
Image for code at: https://drive.google.com/open?id=0B-T2cvsAoZ2vQ2hmaHM0SnlQVlU
# Modified from https://gist.github.com/tshirtman/6222891
from kivy.app import App
from kivy.properties import NumericProperty
from kivy.lang import Builder
from kivy.clock import Clock
kv = """
BoxLayout:
Widget:
Scatter:
center: self.parent.center
do_rotation: False
do_translation: False
do_scale: False
rotation: app.angle
Image:
source: '45rpm.png'
"""
class RotateRecordApp(App):
angle = NumericProperty(0)
def build(self):
Clock.schedule_interval(self.update_angle, 0)
return Builder.load_string(kv)
def update_angle(self, dt, *args):
self.angle += dt * 100
if __name__ == '__main__':
RotateRecordApp().run()

Answer 1

Use scale property:
# Modified from https://gist.github.com/tshirtman/6222891
from kivy.app import App
from kivy.properties import NumericProperty
from kivy.lang import Builder
from kivy.clock import Clock
kv = """
BoxLayout:
Widget:
# Gray background
canvas.before:
Color:
rgba: 0.1, 0.1, 0.1, 1
Rectangle:
pos: self.pos
size: self.size
Scatter:
center: self.parent.center
do_rotation: False
do_translation: False
do_scale: False
rotation: app.angle
scale: min(self.parent.width/self.width,\
self.parent.height/self.height)
Image:
source: '45rpm.png'
"""
class RotateRecordApp(App):
angle = NumericProperty(0)
def build(self):
Clock.schedule_interval(self.update_angle, 0)
return Builder.load_string(kv)
def update_angle(self, dt, *args):
self.angle += dt * 100
if __name__ == '__main__':
RotateRecordApp().run()
Output:
I added a gray background just to improve image visibility.