Comment redimensionner et dessiner dans QImage

Question

J'utilise python PyQt4.

Ce que je veux faire:

(1) échelle l'image de 1280x1024 à 860x480, et montrer à QImageWidget. (2) trace une ligne sur l'image en utilisant la souris.

# -*- coding: utf-8 -*- 

import ConfigParser 
from PyQt4 import QtCore,QtGui 
from PyQt4.QtGui import QImage 
from PyQt4.QtGui import QApplication, QMainWindow, QPushButton 
import sys , time , datetime 
import cv2 
import os 
import numpy as np 

video = cv2.VideoCapture(0) 
video.set(3,1280) 
video.set(4,1024) 
class ImageWidget(QtGui.QWidget): 
    def __init__(self,parent=None): 
     super(ImageWidget,self).__init__(parent) 
     self.image=None 

    def setImage(self,image): 
     self.image=image 
     sz=image.size() 
     self.setMinimumSize(sz) 
     self.update() 

    def paintEvent(self,event): 
     qp=QtGui.QPainter() 
     qp.begin(self) 
     if self.image: 
      qp.drawImage(QtCore.QPoint(0,0),self.image) 
     qp.end() 
class MainWindow(QtGui.QMainWindow): 
    def __init__(self,parent=None): 
     super(MainWindow,self).__init__(parent) 

     self.videoFrame=ImageWidget() 
     self.setCentralWidget(self.videoFrame) 
     screen = QtGui.QDesktopWidget().screenGeometry() 
     self.showFullScreen() 
     self.timer=QtCore.QTimer(self) 

     self.timer.timeout.connect(self.update) 
     self.timer.start(50) 
    def update(self): 
     ret, frame = video.read() 
     frame = cv2.cvtColor(frame, cv2.COLOR_BGR2RGB) 
     image = QtGui.QImage(frame, frame.shape[1], frame.shape[0],frame.strides[0], QtGui.QImage.Format_RGB888) 

     # here I want to scale to 860x480... 
     self.videoFrame.setImage(image) 

# draw ... ? 

def main(): 
    app=QtGui.QApplication(sys.argv) 
    w=MainWindow() 
    w.show() 
    app.exec_() 

if __name__=='__main__': 
    main() 

Est-ce que quelqu'un sait où pourrais-je trouver l'exemple/doc?

Answer 1

here est la doc mise à l'échelle.

# -*- coding: utf-8 -*- 

from PyQt4 import QtCore,QtGui 
from PyQt4.QtGui import QImage 
from PyQt4.QtGui import QApplication, QMainWindow, QPushButton 
import sys , time , datetime 
import cv2 
import numpy as np 

video = cv2.VideoCapture(0) 
video.set(3,1280) 
video.set(4,1024) 
class ImageWidget(QtGui.QWidget): 
    def __init__(self,parent=None): 
     super(ImageWidget,self).__init__(parent) 
     self.image=None 

    def setImage(self,image): 
     self.image=image 
     sz=image.size() 
     self.setMinimumSize(sz) 
     self.update() 

    def paintEvent(self,event): 
     qp=QtGui.QPainter() 
     qp.begin(self) 
     if self.image: 
      qp.drawImage(QtCore.QPoint(0,0),self.image) 
     qp.end() 

    # here get the mouseclick and move.. 
    def mousePressEvent(self, event): # click 
     print event.pos() 

    def mouseMoveEvent(self, event): # move 
     print event.pos() 

class MainWindow(QtGui.QMainWindow): 
    def __init__(self,parent=None): 
     super(MainWindow,self).__init__(parent) 

     self.fAction = QtGui.QAction(u"click me", self) 

     menubar = self.menuBar() 
     self.fileMenu = menubar.addAction(u"click me") 
     font = self.fileMenu.font() 
     font.setPointSize(30) 
     menubar.setFont(font) 

     self.videoFrame=ImageWidget() 
     self.setCentralWidget(self.videoFrame) 
     screen = QtGui.QDesktopWidget().screenGeometry() 
     self.showFullScreen() 
     self.timer=QtCore.QTimer(self) 
     self.timer.timeout.connect(self.update) 
     self.timer.start(50) 
    def update(self): 
      ret, frame = video.read() 
      frame = cv2.cvtColor(frame, cv2.COLOR_BGR2RGB) 
      image = QtGui.QImage(frame, frame.shape[1], frame.shape[0],frame.strides[0], QtGui.QImage.Format_RGB888) 
      image.scaledToWidth (640,QtCore.Qt.SmoothTransformation) 
      image.scaledToHeight(480,QtCore.Qt.SmoothTransformation) 
      # here is sclae my image... 
      result = image.scaled(640, 480, QtCore.Qt.KeepAspectRatioByExpanding, QtCore.Qt.SmoothTransformation) 
      self.videoFrame.setImage(result) 
def main(): 
    app=QtGui.QApplication(sys.argv) 
    w=MainWindow() 
    w.show() 
    app.exec_() 

if __name__=='__main__': 
    main()