Add UiBar class

src/ui/UiBar.py

@@ -1,5 +1,22 @@
-import src.ui.UiElement as UiElement
+import pygame
+
+from src.ui.UiElement import UiElement
 
 
 class UiBar(UiElement):
-    pass
+    def __init__(self, rect: pygame.Rect, initialFilledPercent=100, filledBarColor=(255, 0, 0), emptyBarColor=(0, 0, 0),
+                 outlineColor=(75, 75, 75), outlineThickness=10):
+        super().__init__(rect)
+        self.filledPercent = initialFilledPercent / 100
+        self.emptyBarColor = emptyBarColor
+        self.barColor = filledBarColor
+
+        self.image = pygame.Surface((rect.width, rect.height))
+
+        filledPartRect = pygame.rect.Rect(outlineThickness / 2, outlineThickness / 2,
+                                          (rect.width - outlineThickness) * self.filledPercent,
+                                          rect.height - outlineThickness)
+        self.image.fill(filledBarColor, filledPartRect)
+
+        pygame.draw.rect(self.image, outlineColor, pygame.rect.Rect(0, 0, rect.width, rect.height),
+                         outlineThickness)