add number_circle

frontend/views/number_circle.py

@@ -0,0 +1,48 @@
+import tkinter as tk
+from tkinter import ttk
+from PIL import Image, ImageDraw, ImageChops
+
+from .base import View
+
+class NumberCircleView(View):
+
+    def _init_ui(self):
+        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 _init_im(self):
+        im = Image.new('1', self.size, 'white')
+        draw = ImageDraw.Draw(im)
+        self.target_r = min(self.center)-10
+        draw.circle(self.center, self.target_r,
+                     outline="#000000")
+        return im
+
+    def update_weight(self, weight):
+        weight_radius = 0.0
+        bkg_im = self.bkg_im.copy()
+        draw = ImageDraw.Draw(bkg_im)
+        draw.text((50, 68), f"{weight:.1f} g",
+                     fill='black', font_size=24)
+
+        try:
+            target = float(self.target.get())
+            weight_radius = weight / target * self.target_r
+
+            circle_im = Image.new('1', self.size, 'black')
+            circle_draw = ImageDraw.Draw(circle_im)
+
+            if weight_radius > 0.1:
+                circle_draw.circle(self.center, weight_radius, fill="#FFFFFF")
+            
+                return ImageChops.logical_xor(bkg_im, circle_im)
+
+        except Exception as e:
+            print('Invalid target value:', e)
+            pass
+        return bkg_im