calculator.py

import cv2
from cvzone.HandTrackingModule import HandDetector
import pyttsx3
class calculator:
    def __init__(self, pos, width, height, value):
        self.pos = pos
        self.width = width
        self.height = height
        self.value = value
 
    def drawbutton(self, img):
        cv2.rectangle(img, self.pos, (self.pos[0] + self.width, self.pos[1] + self.height),
                      (125, 125, 225), cv2.FILLED)
        cv2.rectangle(img, self.pos, (self.pos[0] + self.width, self.pos[1] + self.height),
                      (50, 50, 50), 3)
        cv2.putText(img, self.value, (self.pos[0] + 30, self.pos[1] + 70), cv2.FONT_HERSHEY_PLAIN,
                    2, (50, 50, 50), 2)
 
    def Click(self, x, y):
        if self.pos[0] < x < self.pos[0] + self.width and \
                self.pos[1] < y < self.pos[1] + self.height:
            cv2.rectangle(img, (self.pos[0] + 3, self.pos[1] + 3),
                          (self.pos[0] + self.width - 3, self.pos[1] + self.height - 3),
                          (255, 255, 255), cv2.FILLED)
            cv2.putText(img, self.value, (self.pos[0] + 25, self.pos[1] + 80), cv2.FONT_HERSHEY_PLAIN,
                        5, (0, 0, 0), 5)
            return True
        else:
            return False
engine = pyttsx3.init()
voices = engine.getProperty('voices')
engine.setProperty('voice', voices[0].id)
engine.say("please wait! the virtual calculator is starting")
engine.runAndWait() 
 
buttons = [['7', '8', '9', 'C'],
                    ['4', '5', '6', '*'],
                    ['1', '2', '3', '+'],
                    ['0', '-', '/', '='],
                    ['(',')','.','del']]
buttonList = []
for x in range(4):
    for y in range(5):
        xpos = x * 100 + 700
        ypos = y * 100 + 100
        buttonList.append(calculator((xpos, ypos), 100, 100, buttons[y][x]))

Equation = ''
Counter = 0
# Webcam
cap = cv2.VideoCapture(0,cv2.CAP_DSHOW)
cap.set(3,1280)
cap.set(4,1080)
detector = HandDetector(detectionCon=0.9, maxHands=1)
 
while True:
    success, img = cap.read()
    img = cv2.flip(img, 1)
    hands,img = detector.findHands(img)
    for button in buttonList:
        button.drawbutton(img)
    
    # Check for Hand
    if hands:
        # Find distance between fingers
        lmList = hands[0]['lmList']
        length, _, img = detector.findDistance(lmList[8], lmList[12], img)
        # print(length)
        x, y = lmList[8]
 
        # If clicked check which button and perform action
        if length < 50 and Counter == 0:
            for i, button in enumerate(buttonList):
                if button.Click(x, y):
                    myValue = buttons[int(i % 5)][int(i / 5)]  # get correct number
                    # engine.say(myValue)
                    # engine.runAndWait() 
                    if myValue == '=':
                        try:
                            Equation = str(eval(Equation))
                        except SyntaxError:
                            print("Syntax Error")
                            engine.say("Syntax Error")
                            engine.runAndWait() 
                            Equation='Syntax Error'       
                    elif Equation=='Syntax Error':
                        Equation=''
                    elif myValue == 'C':
                        Equation ='' 
                    elif myValue=='del':
                        Equation=Equation[:-1] 
                    else:
                        Equation += myValue
                    Counter = 1
 
    # to avoid multiple clicks
    if Counter != 0:
        Counter += 1
        if Counter > 10:
            Counter = 0
 
    # Final answer
    cv2.rectangle(img, (700, 20), (1100, 100),
                  (175, 125, 155), cv2.FILLED)
 
    cv2.rectangle(img, (700, 20), (1100, 100),
                  (50, 50, 50), 3)        
    cv2.putText(img, Equation, (710, 80),cv2.FONT_HERSHEY_PLAIN,
                3, (0, 0, 0), 3)
    cv2.putText(img, 'VIRTUAL CALCULATOR -->', (50, 50), cv2.FONT_HERSHEY_PLAIN,
                3, (0, 0, 0), 3)            
    cv2.imshow("Virtual Calculator", img)
    cv2.moveWindow("Virtual Calculator", 0,0)
    #close the webcam
    if cv2.waitKey(10) & 0xFF == ord("q"): 
        break