basic dial on screen

thermopi/screen.py

@@ -1,19 +1,51 @@
 import pygame
 
+DIAL_SIZE = 500
+SCREEN_SIZE = 720
+FPS = 60
+PI = 3.14159265
+
+
+class Dial(pygame.sprite.Sprite):
+    def __init__(self):
+        super().__init__()
+        self.image = pygame.Surface((DIAL_SIZE, DIAL_SIZE))
+
+        self.rect = self.image.get_rect()
+        self.max = (10.0 / 6.0) * PI
+        self.min = (8.0 / 6.0) * PI
+        self.value = 1
+
+    def update(self):
+        self.image.fill((0, 0, 0))
+        pygame.draw.arc(self.image, (255, 255, 255), self.rect, self.min - (self.max * self.value), self.min, 32)
+
 
 def main(windowed_mode):
     pygame.init()
     clock = pygame.time.Clock()
     if windowed_mode:
-        window = pygame.display.set_mode((720, 720))
+        window = pygame.display.set_mode((SCREEN_SIZE, SCREEN_SIZE))
     else:
-        window = pygame.display.set_mode((720, 720), pygame.FULLSCREEN)
+        window = pygame.display.set_mode((SCREEN_SIZE, SCREEN_SIZE), pygame.FULLSCREEN)
 
+    all_sprites = pygame.sprite.Group()
+
+    dial = Dial()
+    all_sprites.add(dial)
+
+    def draw():
+        # Draws all the sprites on a black background
+        all_sprites.update()
         window.fill((0, 0, 0))
+        all_sprites.draw(window)
+
+        # Update the entire display
+        pygame.display.flip()
 
     running = True
     while running:
-        clock.tick(60)
+        clock.tick(FPS)
 
         # pygame.mouse.set_visible(False)
 
@@ -25,12 +57,7 @@ def main(windowed_mode):
                     running = False
 
         mouse_pos = pygame.mouse.get_pos()
-        window.fill((0, 0, 0))
-        pygame.draw.line(window, (255, 255, 255), (0, 0), mouse_pos, 10)
-        pygame.draw.line(window, (255, 255, 255), (0, 720), mouse_pos, 10)
-        pygame.draw.line(window, (255, 255, 255), (720, 720), mouse_pos, 10)
-        pygame.draw.line(window, (255, 255, 255), (720, 0), mouse_pos, 10)
 
-        pygame.display.flip()
+        draw()
 
     pygame.quit()