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# 12.9 (Tkinter: two rectangles intersect?) Using the Rectangle2D class you defined in
# Exercise 8.19, write a program that enables the user to specify the location and
# size of the rectangles and displays whether the two rectangles intersect, as shown
# in Figure 12.21. Enable the user to point the mouse inside a rectangle and drag it.
# As a rectangle is being dragged, the program updates the rectangle’s center coordinates,
# width, and height in the text fields.
import math
from tkinter import *
class Rectangle2D:
def __init__(self, x=0, y=0, width=0, height=0):
self.__x__ = x
self.__y__ = y
self.__w__ = width
self.__h__ = height
def getX(self):
return self.__x__
def getY(self):
return self.__y__
def getWidth(self):
return self.__w__
def getHeight(self):
return self.__h__
def setX(self, x):
self.__x__ = x
def setY(self, y):
self.__y__ = y
def setWidth(self, width):
self.__w__ = width
def setHeight(self, height):
self.__h__ = height
def getArea(self):
return self.__w__ * self.__h__
def getPerimeter(self):
return (self.__w__ + self.__h__) * 2
def containsPoint(self, x, y):
return abs(x - self.__x__) <= self.__w__ and abs(y - self.__y__) <= self.__h__
def contains(self, rect):
dis = math.sqrt((self.__x__ - rect.getX()) ** 2 + (self.__y__ - rect.getY()) ** 2)
return True if dis + rect.getWidth() <= self.__w__ and dis + rect.getHeight() <= self.__h__ else False
def overlaps(self, rect):
xOvelLap = (self.getX() >= rect.getX() and self.getX() <= rect.getX() + rect.getWidth()) or \
(rect.getX() >= self.getX() and rect.getX() <= self.getX() + self.getWidth())
yOverLap = (self.getY() >= rect.getY() and self.getY() <= rect.getY() + rect.getHeight()) or \
(rect.getY() >= self.getY() and rect.getY() <= self.getY() + self.getHeight())
return xOvelLap and yOverLap
def __contains__(self, rect):
return True if rect.contains(self) else False
def __lt__(self, rect):
return self.__cmp__(rect) < 0
def __le__(self, rect):
return self.__cmp__(rect) <= 0
def __eq__(self, rect):
return self.__cmp__(rect) == 0
def __ne__(self, rect):
return self.__cmp__(rect) != 0
def __gt__(self, rect):
return self.__cmp__(rect) > 0
def __ge__(self, rect):
return self.__cmp__(rect) >= 0
def displayRectangle(r, text):
canvas.delete(text)
canvas.create_rectangle(r.getX(), r.getY(), r.getX() + r.getWidth(), r.getY() + r.getHeight(), tags=text)
canvas.create_text(r.getX() + r.getWidth() / 2, r.getY() + r.getHeight() / 2, text=text, tags=text)
def mouseMoved(event):
if r1.containsPoint(event.x, event.y):
r1.setX(event.x)
r1.setY(event.y)
displayRectangle(r1, "r1")
r1x.set(r1.getX())
r1y.set(r1.getY())
r1.setWidth(r1Width.get())
r1.setHeight(r1Height.get())
if r1.overlaps(r2):
label["text"] = "Two rectangles intersect"
else:
label["text"] = "Two rectangles don't intersect"
if r2.containsPoint(event.x, event.y):
r2.setX(event.x)
r2.setY(event.y)
displayRectangle(r2, "r2")
r2x.set(r2.getX())
r2y.set(r2.getY())
r2.setWidth(r2Width.get())
r2.setHeight(r2Height.get())
if r1.overlaps(r2):
label["text"] = "Two rectangles intersect"
else:
label["text"] = "Two rectangles don't intersect"
def redraw():
r1 = Rectangle2D(r1x.get(), r1y.get(), r1Width.get(), r1Height.get())
r2 = Rectangle2D(r2x.get(), r2y.get(), r2Width.get(), r2Height.get())
displayRectangle(r1, 'r1')
displayRectangle(r2, 'r2')
window = Tk() # Create a window
window.title("Two Rectangles") # Set title
width = 500
height = 500
label = Label(window, text="Two rectangles intersect")
label.pack()
canvas = Canvas(window, width=width, height=height)
canvas.pack()
canvas.bind("", mouseMoved)
r1 = Rectangle2D(15, 20, 90, 120)
r2 = Rectangle2D(100, 50, 120, 90)
displayRectangle(r1, "r1")
displayRectangle(r2, "r2")
frame1 = Frame(window)
frame1.pack()
Label(frame1, text="R1 Center x:").grid(row=1, column=1)
Label(frame1, text="R1 Center y:").grid(row=2, column=1)
Label(frame1, text="R1 Width:").grid(row=3, column=1)
Label(frame1, text="R1 Height:").grid(row=4, column=1)
r1x = DoubleVar()
r1x.set(r1.getX())
Entry(frame1, width=5, justify=RIGHT, textvariable=r1x).grid(row=1, column=2)
r1y = DoubleVar()
r1y.set(r1.getY())
Entry(frame1, width=5, justify=RIGHT, textvariable=r1y).grid(row=2, column=2)
r1Width = DoubleVar()
r1Width.set(r1.getWidth())
Entry(frame1, width=5, justify=RIGHT, textvariable=r1Width).grid(row=3, column=2)
r1Height = DoubleVar()
r1Height.set(r1.getHeight())
Entry(frame1, width=5, justify=RIGHT, textvariable=r1Height).grid(row=4, column=2)
Label(frame1, text="R2 Center x:").grid(row=1, column=3)
Label(frame1, text="R2 Center y:").grid(row=2, column=3)
Label(frame1, text="R2 Width:").grid(row=3, column=3)
Label(frame1, text="R2 Height:").grid(row=4, column=3)
r2x = DoubleVar()
r2x.set(r2.getX())
Entry(frame1, width=5, justify=RIGHT, textvariable=r2x).grid(row=1, column=4)
r2y = DoubleVar()
r2y.set(r2.getY())
Entry(frame1, width=5, justify=RIGHT, textvariable=r2y).grid(row=2, column=4)
r2Width = DoubleVar()
r2Width.set(r2.getWidth())
Entry(frame1, width=5, justify=RIGHT, textvariable=r2Width).grid(row=3, column=4)
r2Height = DoubleVar()
r2Height.set(r2.getHeight())
Entry(frame1, width=5, justify=RIGHT, textvariable=r2Height).grid(row=4, column=4)
frame2 = Frame(window)
frame2.pack()
Button(frame2, text="Redraw Circles", command=redraw).pack()
window.mainloop()
