main.py

import cv2
from cvzone.HandTrackingModule import HandDetector


class Button:
    def __init__(self,pos,width,height,value):

        self.pos = pos
        self.width = width
        self.height = height
        self.value = value


    def draw(self,img):
        cv2.rectangle(img,self.pos,(self.pos[0]+self.width,self.pos[1]+self.height),(225,225,225),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]+40,self.pos[1]+60),cv2.FONT_HERSHEY_PLAIN,2,(50,50,50),2)


    def checkClick(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,(self.pos[0]+self.width,self.pos[1]+self.height),(255,255,255),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]+25,self.pos[1]+80),cv2.FONT_HERSHEY_PLAIN,5,(0,0,0),5)
            return True
        else:
            return False


# Webcam
cap = cv2.VideoCapture(0)
cap.set(3,1280) # width
cap.set(4,720) # height
detector = HandDetector(detectionCon=0.8, maxHands=1)


# Creating Buttons
buttonListValues = [['7','8','9','*'],
                    ['4','5','6','-'],
                    ['1','2','3','+'],
                    ['0','/','.','=']]

buttonList = []
for x in range(4):
    for y in range(4):
        xpos = x*100+800
        ypos = y*100+150
        buttonList.append(Button((xpos,ypos),100,100,buttonListValues[y][x]))


# Variables
myEquation = ''
delayCounter = 0


# Loop
while True:
    # Get image from webcam
    success, img = cap.read()
    img = cv2.flip(img,1)

    # Detection of hand
    hands, img = detector.findHands(img,flipType=False)

    # Draw all buttons
    cv2.rectangle(img,(800,50),(800+400,70+100),(225,225,225),cv2.FILLED)
    cv2.rectangle(img,(800,50),(800+400,70+100),(50,50,50),3)
    for button in buttonList:
        button.draw(img)

    # Check for hand
    if hands:
        lmList = hands[0]['lmList']
        length, _, img = detector.findDistance(lmList[8][:2],lmList[12][:2],img)
        x,y = lmList[8][:2]
        if length<50:
            for i, button in enumerate(buttonList):
                if button.checkClick(x,y) and delayCounter == 0:
                    myValue = buttonListValues[int(i%4)][int(i/4)]
                    if myValue == "=":
                        myEquation = str(eval(myEquation))
                    else:
                        myEquation += myValue
                    delayCounter = 1


    # Avoid Duplicates
    if delayCounter != 0:
        delayCounter += 1
        if delayCounter > 10:
            delayCounter = 0

    # Display the Equation/Result
    cv2.putText(img,myEquation,(810,120),cv2.FONT_HERSHEY_PLAIN,3,(50,50,50),3)

    # Display image
    cv2.imshow("Image",img)
    key = cv2.waitKey(1)

    if key == ord('c'):
        myEquation = ''