ADD breakpoints on slider for round changes

widgets/break_slider.py

@@ -0,0 +1,55 @@
+from widgets.slider import HorizontalSlider
+import pygame
+
+class BreakSlider(HorizontalSlider):
+    def __init__(self, screen, x, y, width, height, min_value, max_value):
+        super().__init__(screen, x, y, width, height, min_value, max_value)
+        self.breakpoints = []
+
+        # defaults
+        self.breakpoint_colour = (0, 0, 0)
+        self.breakpoint_line_width = 2
+
+    def add_breakpoint(self, breakpoint):
+        if breakpoint < self.min_value or breakpoint > self.max_value:
+            raise ValueError("Breakpoint must fit between min and max values")
+
+        self.breakpoints.append(breakpoint)
+
+    def set_breakpoints(self, breakpoints):
+        self.breakpoints = breakpoints
+
+    def _draw_breakpoints(self):
+        for breakpoint in self.breakpoints:
+            # create line
+            break_x = self._value_to_knob(breakpoint)
+
+            pygame.draw.line(self.screen, 
+                             self.breakpoint_colour, 
+                             (break_x, self.y), 
+                             (break_x, self.y + self.height), 
+                             width=self.breakpoint_line_width)
+
+    def draw(self):
+        self._draw_slider()
+        self._draw_breakpoints()
+        self._draw_knob()
+
+if __name__ == "__main__":
+    pygame.init()
+    screen = pygame.display.set_mode((800, 600))
+    slider = BreakSlider(screen, 50, 50, 700, 20, 0, 1000)
+    slider.add_breakpoint(100)
+    slider.add_breakpoint(500)
+    slider.add_breakpoint(700)
+    running = True
+
+    while running:
+        screen.fill((0, 0, 0))
+        slider.draw()
+        pygame.display.flip()
+
+        for event in pygame.event.get():
+            if event.type == pygame.QUIT:
+                running = False
+            slider.handle_event(event)