问题描述
我需要将QGraphicsPixmapItem
移过图像左上角的圆圈。也就是说,当我用鼠标抓住圆圈时,我需要图像的左上角跟随圆圈。我将QGraphicsEllipseItem
子类化,并重新实现了itemChange
方法,但是当我将图像的位置设置为该值时,图像的位置不正确。我应该在我的代码中修改什么?
import sys
from PyQt5.QtWidgets import QMainWindow,QApplication,QGraphicsView
from PyQt5 import QtGui,QtWidgets
class MainWindow(QMainWindow):
def __init__(self,parent=None):
super(MainWindow,self).__init__(parent)
self.scene = Scene()
self.view = QGraphicsView(self)
self.setGeometry(10,30,850,600)
self.view.setGeometry(20,22,800,550)
self.view.setScene(self.scene)
class Scene(QtWidgets.QGraphicsScene):
def __init__(self,parent=None):
super(Scene,self).__init__(parent)
# other stuff here
self.set_image()
def set_image(self):
image = Image()
self.addItem(image)
image.set_pixmap()
class Image(QtWidgets.QGraphicsPixmapItem):
def __init__(self,parent=None):
super(Image,self).__init__(parent)
self.setFlag(QtWidgets.QGraphicsItem.ItemIsMovable,True)
def set_pixmap(self):
pixmap = QtGui.QPixmap("image.jpg")
self.setPixmap(pixmap)
self.pixmap_controller = PixmapController(self)
self.pixmap_controller.set_pixmap_controller()
self.pixmap_controller.setPos(self.boundingRect().topLeft())
self.pixmap_controller.setFlag(QtWidgets.QGraphicsItem.ItemSendsScenePositionChanges,True)
def change_image_position(self,position):
self.setPos(position)
class PixmapController(QtWidgets.QGraphicsEllipseItem):
def __init__(self,pixmap):
super(PixmapController,self).__init__(parent=pixmap)
self.pixmap = pixmap
self.setFlag(QtWidgets.QGraphicsItem.ItemIsMovable,True)
color = QtGui.QColor(0,0)
brush = QtGui.QBrush(color)
self.setBrush(brush)
def set_pixmap_controller(self):
self.setRect(-5,-5,10,10)
def itemChange(self,change,value):
if change == QtWidgets.QGraphicsItem.ItemPositionChange:
self.pixmap.change_image_position(value)
return super(PixmapController,self).itemChange(change,value)
if __name__ == "__main__":
app = QApplication(sys.argv)
window = MainWindow()
window.show()
sys.exit(app.exec_())
解决方法
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