add circleview

frontend/app.py

@@ -7,12 +7,13 @@ from statistics import mean
 
 from .serial_reader import SerialReader
 from .config import DEFAULT_CALIB, DISPLAY_TYPES
-from .views import NumberView
+from .views import *
 
 class WeightApp(tk.Tk):
     def __init__(self, weight_reader: SerialReader):
         super().__init__()
         self.weight_reader = weight_reader
+        self.view = None
         
         self.toolbar = tk.Frame(self, padx=10)
         self.toolbar.pack(side=tk.LEFT)
@@ -51,9 +52,11 @@ class WeightApp(tk.Tk):
         self.view_type.pack()
         self.view_type_label = ttk.Label(self.view_type, text="Visual:")
         self.view_type_label.pack(side=tk.LEFT)
-        self.view_type_select = ttk.Combobox(self.view_type, values=[t.value for t in DISPLAY_TYPES], postcommand=self.update_view)
+        self.view_type_select = ttk.Combobox(self.view_type, values=[t.value for t in DISPLAY_TYPES])
         self.view_type_select.set(DISPLAY_TYPES.NUMBER.value)
         self.view_type_select.pack(side=tk.LEFT)
+        self.view_type_update = ttk.Button(self.view_type, text="Refresh", command=self.update_view)
+        self.view_type_update.pack()
 
         #### Display ####
         self.update_view()
@@ -109,12 +112,23 @@ class WeightApp(tk.Tk):
     
     def update_view(self):
         selected_view = self.view_type_select.get()
+        
+        if self.view is not None:
+            self.view.pack_forget()
+
+        
         if selected_view == DISPLAY_TYPES.NUMBER.value:
             self.view = NumberView(self,
                                 tare_command=self.weight_reader.tare,
                                 calibrate_command=self.calibrate,
                                 padx=50)
             self.view.pack(side=tk.RIGHT)
+        elif selected_view == DISPLAY_TYPES.CIRCLE.value:
+            self.view = CircleView(self,
+                                   tare_command=self.weight_reader.tare,
+                                   calibrate_command=self.calibrate,
+                                   padx=50)
+            self.view.pack(side=tk.RIGHT)
         else:
             raise Exception(f"View {selected_view} not found.")
 

frontend/config.py

@@ -12,3 +12,4 @@ MOV_AVG_DEFAULTS = {
 
 class DISPLAY_TYPES(Enum):
     NUMBER = 'number'
+    CIRCLE = 'circle'

frontend/views/__init__.py

@@ -1 +1,2 @@
 from .number import NumberView
+from .circle import CircleView

frontend/views/base.py

@@ -15,6 +15,8 @@ class View(Frame):
         self.canvas = Canvas(self, width=144, height=168, background='white')
         self.canvas.pack()
 
+        self.center = (144 // 2, 168 // 2)
+
         self._init_canvas()
 
     def _init_canvas(self):

frontend/views/circle.py

@@ -0,0 +1,45 @@
+import tkinter as tk
+from tkinter import ttk
+
+from .base import View
+
+class CircleView(View):
+
+    def _init_canvas(self):
+        self.target_r = self.center[0] - 10
+        self.draw_circle(self.center[0], self.center[1],
+                         self.target_r,
+                         outline="#000000")
+        
+        self.target_frame = tk.Frame(self.actions)
+        self.target_frame.pack()
+        self.target_label = ttk.Label(self.target_frame, text="Target (g)")
+        self.target_label.pack(side=tk.LEFT)
+        self.target = ttk.Entry(self.target_frame)
+        self.target.insert(0, 100.0)
+        self.target.pack(side=tk.LEFT)
+
+    def draw_circle(self, x, y, r, **kwargs):
+        self.canvas.create_oval(x-r, y-r, x+r, y+r, **kwargs)
+    
+    def update_weight(self, weight):
+        self.canvas.delete("all")
+
+        weight_r = 0.0
+        try:
+            target = float(self.target.get())
+            weight_r = weight / target * self.target_r
+
+            self.draw_circle(self.center[0], self.center[1],
+                            weight_r,
+                            fill="#000000")
+        except:
+            pass
+        finally:
+            target_outline = "#000000"
+            if weight_r > self.target_r:
+                target_outline = "#FFFFFF"
+            self.draw_circle(self.center[0], self.center[1],
+                            self.target_r,
+                            outline=target_outline)
+