from tkinter import *
from random import *

#--------------------------------------------------    
#Define the class of flowers
#  a flower object contains 
#    its position (x and y)
#    its height, and
#    whether it is blooming or not
    
class Flower :
    
    # Constructor: create a new flower at the specified position
    #  (The constructor is always called __init__
    def __init__(self, xpos, ypos) :   # first parameter is the object being created
        self.x = xpos
        self.y = ypos
        self.height = 20;
        self.blooming = False

    # draw a flower
    def draw(self) :  # first parameter is the object that draw was called on
        stem = 3      # half the width of the stem
        top = self.y-self.height
        canvas.create_rectangle(self.x-stem, top, self.x+stem, self.y, fill="green", outline="green")
            # rectangles specified by left, top, right, bottom.
        if self.blooming :
            radius = 15   # radius and colour of the flower head
            colour = "red"
        else :
            radius = 9    # radius and colour of the bud
            colour = "green"
        canvas.create_oval(self.x-radius, top-radius, self.x+radius, top+radius, fill=colour, outline=colour)
            # ovals also specified by left, top, right, bottom.

    # make a flower higher
    def grow(self, increment) :
        self.height += increment

    # make a flower bloom
    def bloom(self) :
        self.blooming = True;

#--------------------------------------------------    
# main program
#  Constructs the unser interface and contains the list of all the flower objects 

garden = [] # The list of flower objects in the garden

# Function to set up the window and canvas to draw on
def setup() :
    global canvas    # the canvas will be accessed by lots of methods,
                     # Since some of those methods are called from buttons, it is not possible to pass it to
		     # all the methods that need to use it.  Much cleaner to make it global
    window = Tk()    # make a new window
    canvas = Canvas(window, width=600, height=450, bg='white')  # make a new canvas
    canvas.pack()    #pack it into the window (won't show if you don't pack it)
    butGrow = Button(window, text="Grow", command=growAll)      # make new button for the window
    butGrow.pack()   # pack it into the window
    butBloom = Button(window, text="Bloom", command=bloomAll)   # make another button for the window
    butBloom.pack()
    Button(window, text="Clear", command=clear).pack()          # make and pack button in one line

    canvas.bind("<ButtonRelease-1>", plant)   # make the canvas respond to a left mouse button
    window.mainloop()


# plant a new flower at the mouse click   
def plant(event) :                     # parameter is a description of the mouse event that invoked this
    flower = Flower(event.x, event.y)  # make the flower object 
    garden.append(flower)              # put the flower object in the garden
    drawGarden()                       # redraw the garden
    
# make each flower in the garden grow
def growAll() :
    for flower in garden :   
        flower.grow(10)
    drawGarden()
     
# make each flower in the garden bloom
def bloomAll() :
    for flower in garden :   
        flower.bloom()
    drawGarden()
    
# clear all the flowers from the garden and clear the canvas
def clear() :
    global garden
    garden = []
    canvas.delete(ALL)  # delete everything currently on the canvas
    canvas.update()     # necessary to make the changes in the canvas visible

# Draw each flower in the garden
def drawGarden() :      
    canvas.delete(ALL)
    for flower in garden :
        flower.draw()
    canvas.update()

#Start the program by calling setup
setup()