Add resolution parameter to InkyMockImpression.

Copied from #169

Co-authored-by: Phil Howard <phil@gadgetoid.com>

inky/mock.py

@@ -7,10 +7,11 @@
 class InkyMock(inky.Inky):
     """Base simulator class for Inky."""
 
-    def __init__(self, colour, h_flip=False, v_flip=False):
+    def __init__(self, colour, h_flip=False, v_flip=False, resolution=None):
         """Initialise an Inky pHAT Display.
 
         :param colour: one of red, black or yellow, default: black
+        :param resolution: (width, height) in pixels
 
         """
         global tkinter, ImageTk, Image
@@ -25,7 +26,8 @@ def __init__(self, colour, h_flip=False, v_flip=False):
         except ImportError:
             raise ImportError('Simulation requires PIL ImageTk and Image')
 
-        resolution = (self.WIDTH, self.HEIGHT)
+        if resolution is None:
+            resolution = (self.WIDTH, self.HEIGHT)
 
         if resolution not in inky._RESOLUTION.keys():
             raise ValueError('Resolution {}x{} not supported!'.format(*resolution))
@@ -74,12 +76,12 @@ def __init__(self, colour, h_flip=False, v_flip=False):
         self._tk_done = False
         self.tk_root = tkinter.Tk()
         self.tk_root.title('Inky Preview')
-        self.tk_root.geometry('{}x{}'.format(self.WIDTH, self.HEIGHT))
-        self.tk_root.aspect(self.WIDTH, self.HEIGHT, self.WIDTH, self.HEIGHT)
+        self.tk_root.geometry('{}x{}'.format(self.width, self.height))
+        self.tk_root.aspect(self.width, self.height, self.width, self.height)
         self.tk_root.protocol('WM_DELETE_WINDOW', self._close_window)
         self.cv = None
-        self.cvh = self.HEIGHT
-        self.cvw = self.WIDTH
+        self.cvh = self.height
+        self.cvw = self.width
 
     def wait_for_window_close(self):
         """Wait until the Tkinter window has closed."""
@@ -118,7 +120,7 @@ def _display(self, region):
         image = self.disp_img_copy.resize([self.cvw, self.cvh])
         self.photo = ImageTk.PhotoImage(image)
         if self.cv is None:
-            self.cv = tkinter.Canvas(self.tk_root, width=self.WIDTH, height=self.HEIGHT)
+            self.cv = tkinter.Canvas(self.tk_root, width=self.width, height=self.height)
         self.cv.pack(side='top', fill='both', expand='yes')
         self.cvhandle = self.cv.create_image(0, 0, image=self.photo, anchor='nw')
         self.cv.bind('<Configure>', self.resize)
@@ -130,7 +132,7 @@ def show(self, busy_wait=True):
         :param busy_wait: Ignored. Updates are simulated and instant.
 
         """
-        print('>> Simulating {} {}x{}...'.format(self.colour, self.WIDTH, self.HEIGHT))
+        print('>> Simulating {} {}x{}...'.format(self.colour, self.width, self.height))
 
         region = self.buf
 
@@ -234,9 +236,13 @@ class InkyMockImpression(InkyMock):
         [177, 106, 73],
         [255, 255, 255]]
 
-    def __init__(self):
-        """Initialize a new mock Inky Impression."""
-        InkyMock.__init__(self, 'multi')
+    def __init__(self, resolution=None):
+        """Initialize a new mock Inky Impression.
+
+        :param resolution: (width, height) in pixels, default: (600, 448)
+
+        """
+        InkyMock.__init__(self, 'multi', resolution=resolution)
 
     def _simulate(self, region):
         self._display(region)