如果没有循环代码和工作示例,很难确定您的问题。但我有类似的测试应用程序,希望它会有所帮助。
#!/usr/bin/env python
# -*- coding: utf-8 -*-
import sys
from PyQt4.QtCore import *
from PyQt4.QtGui import *
import Image
import ImageQt
import ImageEnhance
import time
class TestWidget(QWidget):
def __init__(self, parent=None):
QWidget.__init__(self, parent)
self.scene = QGraphicsScene()
self.view = QGraphicsView(self.scene)
self.button = QPushButton("Do test")
layout = QVBoxLayout()
layout.addWidget(self.button)
layout.addWidget(self.view)
self.setLayout(layout)
self.button.clicked.connect(self.do_test)
def do_test(self):
img = Image.open('image.png')
enhancer = ImageEnhance.Brightness(img)
for i in range(1, 8):
img = enhancer.enhance(i)
self.display_image(img)
QCoreApplication.processEvents() # let Qt do his work
time.sleep(0.5)
def display_image(self, img):
self.scene.clear()
w, h = img.size
self.imgQ = ImageQt.ImageQt(img) # we need to hold reference to imgQ, or it will crash
pixMap = QPixmap.fromImage(self.imgQ)
self.scene.addPixmap(pixMap)
self.view.fitInView(QRectF(0, 0, w, h), Qt.KeepAspectRatio)
self.scene.update()
if __name__ == "__main__":
app = QApplication(sys.argv)
widget = TestWidget()
widget.resize(640, 480)
widget.show()
sys.exit(app.exec_())
要点:
如果您在循环做一些处理或sleep
,你需要调用QCoreApplication.processEvents()
允许的Qt做更新。
我正在保存对ImageQt.ImageQt
(self.imgQ
)的引用,否则它会崩溃。
据我所知,你在每次迭代中创建QGraphicsScene
,创建一次的更好的解决方案,然后调用scene.clear()
。
缩放pixmap只是为了显示它的大小和居中价格昂贵,QGraphicsView.fitInView()
为此目的。
这很好,谢谢。 – TimothyAWiseman 2012-03-20 20:17:17