test2_app.py

from PyQt5.QtWidgets import QMainWindow, QApplication, QAction
from PyQt5.QtGui import QIcon, QImage, QPainter, QPen
from PyQt5.QtCore import Qt, QPoint


class Test2_app(QMainWindow):
    def __init__(self):
        super().__init__()

        title = "test2-app"
        X_cor = 3
        Y_cor = 231
        width = 994
        height = 658

        self.setWindowTitle(title)
        self.setGeometry(X_cor, Y_cor, width, height)

        self.image = QImage(self.size(), QImage.Format_RGB32)
        self.image.fill(Qt.white)

        self.drawing = False
        self.brushSize = 25
        self.brushColor = Qt.black
        self.lastPoint = QPoint()

        mainMenu = self.menuBar()
        fileMenu = mainMenu.addMenu("Clear")

        clearAction = QAction("Clear", self)
        clearAction.setShortcut("Ctrl+C")
        fileMenu.addAction(clearAction)
        clearAction.triggered.connect(self.clear)

    def mousePressEvent(self, event):
        if event.button() == Qt.LeftButton:
            self.drawing = True
            self.lastPoint = event.pos()

    def mouseMoveEvent(self, event):
        if(event.buttons() & Qt.LeftButton) & self.drawing:
            painter = QPainter(self.image)
            painter.setPen(QPen(self.brushColor, self.brushSize, Qt.SolidLine, Qt.RoundCap, Qt.RoundJoin))
            painter.drawLine(self.lastPoint, event.pos())
            self.lastPoint = event.pos()
            self.update()

    def mouseReleaseEvent(self, event):
        if event.button() == Qt.LeftButton:
            self.drawing = False
        self.save1()

    def paintEvent(self, event):
        canvasPainter  = QPainter(self)
        canvasPainter.drawImage(self.rect(),self.image, self.image.rect() )

    def save1(self):
        path = ("dependencies/images/predict2.png")
        self.image.save(path)

    def clear(self):
        self.image.fill(Qt.white)
        self.update()
        self.save1()