outsourced the fx_mode buttons to a new class and some refactoring

lozenge_button.py

@@ -0,0 +1,38 @@
+import pygame
+import math
+from colors import *
+from fonts import *
+
+class LozengeButton:
+
+    def __init__(self, gui, name, position, radius_x, radius_y):
+        self.gui = gui
+        self.screen = gui.screen
+        self.name = name
+        self.x = position[0]
+        self.y = position[1]
+        self.radius_x = radius_x
+        self.radius_y = radius_y
+        self.focused = False
+
+    def display(self):
+        m1, m2, m3 = pygame.mouse.get_pressed(3)
+        if m1:
+            pos = pygame.mouse.get_pos()
+            if math.sqrt(math.pow(pos[0] - self.x, 2) + math.pow(pos[1] - self.y, 2)) < self.radius_y:
+                self.focused = True
+                self.gui.set_fx_mode(self.name)
+
+        if self.focused:
+            w = 0
+            fx_mode_label = font_helvetica16.render(self.name, False, color_primary)
+            self.screen.blit(fx_mode_label, (self.x + 20, self.y - 8))
+        else:
+            w = 2
+            fx_mode_label = font_helvetica16.render(str(self.name)[0:1], False, color_primary)
+            self.screen.blit(fx_mode_label, (self.x - 4, self.y - 7))
+        pygame.draw.polygon(self.screen, color_primary,
+                            [(self.x - self.radius_x, self.y),
+                             (self.x, self.y - self.radius_y),
+                             (self.x + self.radius_x, self.y),
+                             (self.x, self.y + self.radius_y)], w)