How to draw rectangle on image?
Unsolved
Qt for Python
-
I want to draw rectangle on image who I choose. But I dont know how. Please help me : (
from PyQt5 import QtCore, QtGui, QtWidgets from PyQt5.QtWidgets import QFileDialog from PyQt5.QtGui import QPixmap, QImage, QPen, QPainter from PyQt5.QtCore import Qt from alg import SpriteSlicer import cv2 class Ui_MainWindow(object): def setupUi(self, MainWindow): MainWindow.setObjectName("MainWindow") MainWindow.resize(800, 700) self.centralwidget = QtWidgets.QWidget(MainWindow) self.centralwidget.setObjectName("centralwidget") self.btn_Open = QtWidgets.QPushButton(self.centralwidget) self.btn_Open.setGeometry(QtCore.QRect(20, 10, 94, 40)) self.btn_Open.setObjectName("btn_Open") self.btn_Save = QtWidgets.QPushButton(self.centralwidget) self.btn_Save.setGeometry(QtCore.QRect(160, 10, 94, 40)) self.btn_Save.setObjectName("btn_Save") self.btn_Start = QtWidgets.QPushButton(self.centralwidget) self.btn_Start.setGeometry(QtCore.QRect(350, 10, 94, 40)) self.btn_Start.setObjectName("btn_Start") self.imageView = QtWidgets.QLabel(self.centralwidget) self.imageView.setGeometry(QtCore.QRect(0, 55, 800, 600)) self.imageView.setStyleSheet(u"background-color: rgb(115, 115, 115);") self.imageView.setText("") self.imageView.setObjectName("imageView") MainWindow.setCentralWidget(self.centralwidget) self.retranslateUi(MainWindow) QtCore.QMetaObject.connectSlotsByName(MainWindow) self.file_name = None self.btn_Open.clicked.connect(self.open_file) self.btn_Start.clicked.connect(self.start_alg) def retranslateUi(self, MainWindow): _translate = QtCore.QCoreApplication.translate MainWindow.setWindowTitle(_translate("MainWindow", "MainWindow")) self.btn_Open.setText(_translate("MainWindow", "Open")) self.btn_Save.setText(_translate("MainWindow", "Save")) self.btn_Start.setText(_translate("MainWindow", "Start")) def open_file(self): self.file_name, _ = QFileDialog.getOpenFileName(MainWindow, "", "", "Image files (*.jpg *.png)") self.image = QPixmap(self.file_name).scaled(800, 600, Qt.KeepAspectRatio, Qt.SmoothTransformation) self.w = self.image.width() self.h = self.image.height() self.imageView.setPixmap(self.image) def start_alg(self): if self.file_name is not None: sprite_slicer = SpriteSlicer(self.file_name, self.w, self.h) self.coords = sprite_slicer.rects_coords #this is the coords I want to draw on image def paintEvent(self, event): pen = QPen() pen.setWidth(5) print("WORK") painter = QPainter(MainWindow) painter.drawPixmap(self.rect(), self.image) painter.setPen(pen) painter.drawRect(300, 300, 500, 500) self.imageView.setPixmap(self.image) #,Qt.SmoothTransformation if __name__ == "__main__": import sys app = QtWidgets.QApplication(sys.argv) MainWindow = QtWidgets.QMainWindow() ui = Ui_MainWindow() ui.setupUi(MainWindow) MainWindow.show() sys.exit(app.exec_()) -
Hi,
You are adding QWidget methods to an object based class.
Create a subclass of QMainWindow where you add these methods.
@Toso said in How to draw rectangle on image?:
ui = Ui_MainWindow()
ui.setupUi(MainWindow)Use that in your QMainWindow
__init__function. -
isnt working, draw is not on image
from PyQt5 import QtCore, QtGui, QtWidgets from PyQt5.QtWidgets import QFileDialog, QWidget, QApplication from PyQt5.QtGui import QPixmap, QImage, QPen, QPainter from PyQt5.QtCore import Qt from alg import SpriteSlicer import cv2 class GUI_SpriteSlicer(QWidget): def __init__(self): super().__init__() self.resize(800, 700) self.centralwidget = QtWidgets.QWidget(self) self.centralwidget.setObjectName("centralwidget") self.btn_Open = QtWidgets.QPushButton(self.centralwidget) self.btn_Open.setGeometry(QtCore.QRect(20, 10, 94, 40)) self.btn_Open.setObjectName("btn_Open") self.btn_Save = QtWidgets.QPushButton(self.centralwidget) self.btn_Save.setGeometry(QtCore.QRect(160, 10, 94, 40)) self.btn_Save.setObjectName("btn_Save") self.btn_Start = QtWidgets.QPushButton(self.centralwidget) self.btn_Start.setGeometry(QtCore.QRect(350, 10, 94, 40)) self.btn_Start.setObjectName("btn_Start") self.imageView = QtWidgets.QLabel(self.centralwidget) self.imageView.setGeometry(QtCore.QRect(0, 55, 800, 600)) self.imageView.setStyleSheet(u"background-color: rgb(115, 115, 115);") self.imageView.setText("") self.imageView.setObjectName("imageView") #self.setCentralWidget(self.centralwidget) self.retranslateUi(self) QtCore.QMetaObject.connectSlotsByName(self) self.file_name = None self.draw = False self.btn_Open.clicked.connect(self.open_file) self.btn_Start.clicked.connect(self.start_alg) def retranslateUi(self, MainWindow): _translate = QtCore.QCoreApplication.translate MainWindow.setWindowTitle(_translate("MainWindow", "MainWindow")) self.btn_Open.setText(_translate("MainWindow", "Open")) self.btn_Save.setText(_translate("MainWindow", "Save")) self.btn_Start.setText(_translate("MainWindow", "Start")) def open_file(self): self.file_name, _ = QFileDialog.getOpenFileName(self, "", "", "Image files (*.jpg *.png)") self.image = QPixmap(self.file_name).scaled(800, 600, Qt.KeepAspectRatio, Qt.SmoothTransformation) self.w = self.image.width() self.h = self.image.height() self.imageView.setPixmap(self.image) self.imageView.setAlignment(Qt.AlignCenter) def start_alg(self): if self.file_name is not None: sprite_slicer = SpriteSlicer(self.file_name, self.w, self.h) self.coords = sprite_slicer.rects_coords self.draw = True #img = sprite_slicer.original #img = cv2.cvtColor(img, cv2.COLOR_BGR2RGB) #image = QImage(img, self.w, self.h, img.strides[0], QImage.Format_RGB888) #self.imageView.setPixmap(QPixmap.fromImage(image)) def paintEvent(self, event): if self.draw: print("TRUE") pen = QPen() pen.setWidth(5) painter = QPainter(self.imageView) painter.setPen(pen) painter.drawEllipse(200, 200, 500, 500) self.update() self.draw = False if __name__ == "__main__": import sys app = QApplication(sys.argv) gui = GUI_SpriteSlicer() gui.show() sys.exit(app.exec_()) -
@Toso said in How to draw rectangle on image?:
painter = QPainter(self.imageView)
You cannot paint on a different widget hence the error message you get.
