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Author: Vedika45

Diff for: BounceBalls.py

@@ -0,0 +1,94 @@
+from tkinter import * # Import tkinter
+from random import randint
+
+# Return a random color string in the form #RRGGBB
+def getRandomColor():
+    color = "#"
+    for j in range(6):
+        color += toHexChar(randint(0, 15)) # Add a random digit
+    return color
+
+# Convert an integer to a single hex digit in a character 
+def toHexChar(hexValue):
+    if 0 <= hexValue <= 9:
+        return chr(hexValue + ord('0'))
+    else:  # 10 <= hexValue <= 15
+        return chr(hexValue - 10 + ord('A'))
+        
+# Define a Ball class
+class Ball:
+    def __init__(self):
+        self.x = 0 # Starting center position
+        self.y = 0 
+        self.dx = 2 # Move right by default
+        self.dy = 2 # Move down by default
+        self.radius = 3 # The radius is fixed
+        self.color = getRandomColor() # Get random color
+
+class BounceBalls:
+    def __init__(self):
+        self.ballList = [] # Create a list for balls
+        
+        window = Tk() # Create a window
+        window.title("Bouncing Balls") # Set a title
+        
+        self.width = 350 # Width of the self.canvas
+        self.height = 150 # Width of the self.canvas
+        self.canvas = Canvas(window, bg = "white", 
+            width = self.width, height = self.height)
+        self.canvas.pack()
+        
+        frame = Frame(window)
+        frame.pack()
+        btStop = Button(frame, text = "Stop", command = self.stop)
+        btStop.pack(side = LEFT)
+        btResume = Button(frame, text = "Resume",
+            command = self.resume)
+        btResume.pack(side = LEFT)
+        btAdd = Button(frame, text = "+", command = self.add)
+        btAdd.pack(side = LEFT)
+        btRemove = Button(frame, text = "-", command = self.remove)
+        btRemove.pack(side = LEFT)
+        
+        self.sleepTime = 100 # Set a sleep time 
+        self.isStopped = False
+        self.animate()
+        
+        window.mainloop() # Create an event loop
+           
+    def stop(self): # Stop animation
+        self.isStopped = True
+    
+    def resume(self): # Resume animation
+        self.isStopped = False   
+        self.animate()
+    
+    def add(self): # Add a new ball
+        self.ballList.append(Ball())
+    
+    def remove(self): # Remove the last ball 
+        self.ballList.pop()
+                                
+    def animate(self): # Move the message
+        while not self.isStopped:
+            self.canvas.after(self.sleepTime) # Sleep 
+            self.canvas.update() # Update self.canvas
+            self.canvas.delete("ball") 
+            
+            for ball in self.ballList:
+                self.redisplayBall(ball)
+    
+    def redisplayBall(self, ball):
+        if ball.x > self.width or ball.x < 0:
+            ball.dx = -ball.dx
+            
+        if ball.y > self.height or ball.y < 0:
+            ball.dy = -ball.dy
+    
+        ball.x += ball.dx
+        ball.y += ball.dy
+        self.canvas.create_oval(ball.x - ball.radius, 
+            ball.y - ball.radius, ball.x + ball.radius, 
+            ball.y + ball.radius, fill = ball.color, tags = "ball")
+                                             
+BounceBalls() # Create GUI