In this article we will see how we can make a PyQt5 application which will visualize the exponential search algorithm.
Fibonacci search technique is a method of searching a sorted array using a divide and conquer algorithm that narrows down possible locations with the aid of Fibonacci numbers.[1] Compared to binary search where the sorted array is divided into two equal-sized parts, one of which is examined further, Fibonacci search divides the array into two parts that have sizes that are consecutive Fibonacci numbers.
GUI implementation steps :
1. Create a list of label according to the given list of numbers
2. Set their text, border, color and geometry with respective gap from each other
3. Each label height should be proportional to the value of each number
4. Create a start and pause push button to start the searching and pause the searching
5. Create a result label to show the searching status
Back end implementation steps :
1. Create label list corresponding to the given numbers
2. Create variable for the index used by Fibonacci search and flag for searching and flag for searching minimum Fibonacci number and for searching value after getting the Fibonacci number
3. Add action to the push button their action should change the flag status i.e start action should make flag true and pause action should make flag false
4. Create timer object which calls a method after every specific time
5. Inside the timer method check for the flag is flag is true begin the search of Fibonacci number
6. After finding the fibonacci number find the given number within the range
7. Show the result
Below is the implementation
Python3
# importing librariesfrom PyQt5.QtWidgets import *from PyQt5 import QtCore, QtGuifrom PyQt5.QtGui import *from PyQt5.QtCore import *import sysclass Window(QMainWindow): # list of numbers number = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15] # desired list desired = 14 def __init__(self): super().__init__() # setting title self.setWindowTitle("Fibonacci Search") # setting geometry self.setGeometry(100, 100, 600, 400) # calling method self.UiComponents() # showing all the widgets self.show() # method for widgets def UiComponents(self): # start flag self.start = False # divide flag self.divide = False self.fib_search = True # list to hold labels self.label_list = [] # fibonacci numbers self.fib1 = 1 self.fib2 = 0 self.fib = self.fib1 + self.fib2 self.offset = -1 # local counter c = 0 # iterating list of numbers for i in self.number: # creating label for each number label = QLabel(str(i), self) # adding background color and border label.setStyleSheet("border : 1px solid black; background : white;") # aligning the text label.setAlignment(Qt.AlignTop) # setting geometry using local counter # first parameter is distance from left # and second is distance from top # third is width and fourth is height label.setGeometry(50 + c * 30, 50, 20, i * 10 + 10) # adding label to the label list self.label_list.append(label) # incrementing local counter c = c + 1 # creating push button to start the search self.search_button = QPushButton("Start Search", self) # setting geometry of the button self.search_button.setGeometry(100, 270, 100, 30) # adding action to the search button self.search_button.clicked.connect(self.search_action) # creating push button to pause the search pause_button = QPushButton("Pause", self) # setting geometry of the button pause_button.setGeometry(100, 320, 100, 30) # adding action to the search button pause_button.clicked.connect(self.pause_action) # creating label to show the result self.result = QLabel("To search : " + str(self.desired), self) # setting geometry self.result.setGeometry(320, 280, 250, 40) # setting style sheet self.result.setStyleSheet("border : 3px solid black;") # adding font self.result.setFont(QFont('Times', 10)) # setting alignment self.result.setAlignment(Qt.AlignCenter) # creating a timer object timer = QTimer(self) # adding action to timer timer.timeout.connect(self.showTime) # update the timer every 300 millisecond timer.start(300) # method called by timer def showTime(self): # checking if flag is true if self.start: # search fibonacci number if self.fib_search: # searching for the Fibonacci number greater # then the desired number if self.fib < len(self.number): self.fib2 = self.fib1 self.fib1 = self.fib self.fib = self.fib2 + self.fib1 self.result.setText("Searching Fibonacci number >=" + str(self.desired)) # start divide search else: self.result.setText("Fibonacci found, searching number") self.fib_search = False self.divide = True # start divide search if self.divide: if self.fib <= 1: self.result.setText("Not found") self.start = False return i = min(self.offset + self.fib2, len(self.number) - 1) self.label_list[i].setStyleSheet("border : 1px solid black;" "background-color : grey") # If desired is greater than the value at # index fib2, cut the subarray array # from offset to i if (self.number[i] < self.desired): self.fib = self.fib1 self.fib1 = self.fib2 self.fib2 = self.fib - self.fib1 self.offset = i # If desired is greater than the value at # index fib2, cut the subarray # after i + 1 elif (self.number[i] > self.desired): self.fib = self.fib2 self.fib1 = self.fib1 - self.fib2 self.fib2 = self.fib - self.fib1 # element found. show result and stop search else: self.result.setText("Found at : " + str(i)) self.label_list[i].setStyleSheet( "border : 2px solid green;" "background-color : lightgreen;") self.start = False # method called by search button def search_action(self): # making flag true self.start = True # showing text in result label self.result.setText("Started searching...") # method called by pause button def pause_action(self): # making flag false self.start = False # showing text in result label self.result.setText("Paused")# create pyqt5 appApp = QApplication(sys.argv)# create the instance of our Windowwindow = Window()# start the appsys.exit(App.exec()) |
Output :
