Update circle.py

Added x0, y0, the co-ordinates of the centre of the circle. Only r, radius added to Circle object to save space. Properties added for x0, y0. Setters also added so that the Circle object can be moved with reference to its center.

Author: empirical-dan

adafruit_display_shapes/circle.py

@@ -53,3 +53,22 @@ def __init__(self, x0, y0, r, *, fill=None, outline=None, stroke=1):
             outline=outline,
             stroke=stroke,
         )
+        self.r = r
+        
+    @property
+    def x0(self):
+        """The x-position of the center of the circle."""
+        return self.x + self.r
+        
+    @property
+    def y0(self):
+        """The y-position of the center of the circle."""
+        return self.y + self.r
+    
+    @x0.setter
+    def x0(self, x0):
+        self.x = x0 - self.r
+        
+    @y0.setter
+    def y0(self, y0):
+        self.y = y0 - self.r