Implemented timer functionality

src/game/Timer.py

@@ -1,4 +1,66 @@
+import pygame
+
+# Timer class for the game
+# We count time every second, an the time elapsed in game is 60 times the actual time
+# So, if we spend 60 seconds, we count that we spent 60 minutes.
+
+# Day/night cycle parameters
+DAY_START = "7:00"
+NIGHT_START = "22:00"
+
+
 class Timer:
-    def __init__(self):
-        self.time
-        self.cycle
+    def __init__(self, startTime="12:00"):
+        self.clock = pygame.time.Clock()
+
+        # Time in milliseconds updated every frame, starts counting from what we specify as a parameter
+        self.timePassed = self.timeToMs(startTime)
+        # You have to start the clock manually by calling startClock() method
+        self.isStarted = False
+
+    def startClock(self):
+        self.isStarted = True
+
+    def stopClock(self):
+        self.isStarted = False
+
+    # Returns a string with formatted time
+    def getPrettyTime(self):
+        # 60 times faster than real time
+        minutes = int(self.timePassed / 1000) % 60
+        hours = int(self.timePassed / 60000) % 24
+
+        # Add 0's at the beginning if necessary
+        prefixHr = ""
+        prefixMin = ""
+        if len(str(hours)) < 2:
+            prefixHr = "0"
+        if len(str(minutes)) < 2:
+            prefixMin = "0"
+
+        # Return a formatted time
+        return prefixHr + str(hours) + ":" + prefixMin + str(minutes)
+
+    # Returns true, if it's daytime
+    def isItDay(self):
+        if self.timeToMs(DAY_START) < self.timePassed < self.timeToMs(NIGHT_START):
+            return True
+        else:
+            return False
+
+    # Called every frame to update the timer
+    def updateTime(self, elapsed):
+        # Only happens if the time is set to be running
+        if self.isStarted:
+            # Modulo, since we use the 24-hour cycle
+            # In our case, the time loops every 24 minutes
+            self.timePassed =(self.timePassed + elapsed) % 1440000
+
+    # Converts time as string to integer milliseconds
+    def timeToMs(self, timeString):
+        timeList = timeString.split(':')
+        hours = timeList[0]
+        minutes = timeList[1]
+        return int(hours) * 60000 + int(minutes) * 1000
+
+