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    <p>You can bind angle of canvas to <code>NumericProperty</code>, to change it from inside your code. All you need to do is to compute those angles correctly. After playing a bit with it I created following code:</p> <pre><code>from kivy.app import App from kivy.uix.widget import Widget from kivy.lang import Builder from kivy.animation import Animation from kivy.properties import NumericProperty import math kv = ''' &lt;Dial&gt;: canvas: Rotate: angle: root.angle origin: self.center Color: rgb: 1, 0, 0 Ellipse: size: min(self.size), min(self.size) pos: 0.5*self.size[0] - 0.5*min(self.size), 0.5*self.size[1] - 0.5*min(self.size) Color: rgb: 0, 0, 0 Ellipse: size: 50, 50 pos: 0.5*root.size[0]-25, 0.9*root.size[1]-25 ''' Builder.load_string(kv) class Dial(Widget): angle = NumericProperty(0) def on_touch_down(self, touch): y = (touch.y - self.center[1]) x = (touch.x - self.center[0]) calc = math.degrees(math.atan2(y, x)) self.prev_angle = calc if calc &gt; 0 else 360+calc self.tmp = self.angle def on_touch_move(self, touch): y = (touch.y - self.center[1]) x = (touch.x - self.center[0]) calc = math.degrees(math.atan2(y, x)) new_angle = calc if calc &gt; 0 else 360+calc self.angle = self.tmp + (new_angle-self.prev_angle)%360 def on_touch_up(self, touch): Animation(angle=0).start(self) class DialApp(App): def build(self): return Dial() if __name__ == "__main__": DialApp().run() </code></pre> <p>I'm calculating difference between initial (after pressing mouse) and later angle in <code>on_touch_move</code>. Since angle is a property I can also modify it using <code>kivy.animation</code> to make dial spin back after releasing mouse button.</p> <p><strong>EDIT</strong></p> <p><code>on_touch_down</code> event for child circle:</p> <pre><code>from kivy.app import App from kivy.uix.widget import Widget from kivy.uix.floatlayout import FloatLayout from kivy.lang import Builder from kivy.animation import Animation from kivy.properties import NumericProperty import math kv = ''' &lt;Dial&gt;: circle_id: circle_id size: root.size pos: 0, 0 canvas: Rotate: angle: self.angle origin: self.center Color: rgb: 1, 0, 0 Ellipse: size: min(self.size), min(self.size) pos: 0.5*self.size[0] - 0.5*min(self.size), 0.5*self.size[1] - 0.5*min(self.size) Circle: id: circle_id size_hint: 0, 0 size: 50, 50 pos: 0.5*root.size[0]-25, 0.9*root.size[1]-25 canvas: Color: rgb: 0, 1, 0 Ellipse: size: 50, 50 pos: self.pos ''' Builder.load_string(kv) class Circle(Widget): def on_touch_down(self, touch): if self.collide_point(*touch.pos): print "small circle clicked" class Dial(Widget): angle = NumericProperty(0) def on_touch_down(self, touch): if not self.circle_id.collide_point(*touch.pos): print "big circle clicked" y = (touch.y - self.center[1]) x = (touch.x - self.center[0]) calc = math.degrees(math.atan2(y, x)) self.prev_angle = calc if calc &gt; 0 else 360+calc self.tmp = self.angle return super(Dial, self).on_touch_down(touch) # dispatch touch event futher def on_touch_move(self, touch): y = (touch.y - self.center[1]) x = (touch.x - self.center[0]) calc = math.degrees(math.atan2(y, x)) new_angle = calc if calc &gt; 0 else 360+calc self.angle = self.tmp + (new_angle-self.prev_angle)%360 def on_touch_up(self, touch): Animation(angle=0).start(self) class DialApp(App): def build(self): return Dial() if __name__ == "__main__": DialApp().run() </code></pre>
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    1. COThis is probably out of scope for this question, but do you know how I could add a touch event to the small circle at the top? I assigned it an on_touch sound event just to make sure I knew what I was doing, but it seems I can either have rotation /or/ I can have the on_touch for the child circle---I can't seem to have both on at the same time.
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    2. COYou have to dispatch `on_touch_down` event further using `super`. I added the example.
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    3. COThat seems to be double-printing both events?
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