我需要将 a 旋转QGraphicsPixmapItem
一圈。也就是说,圆圈始终需要位于图像的左上角,当我拖动圆圈时,图像必须旋转。我使用 设置旋转角度setRotation
,使用 设置旋转点setTransformOriginPoint
。但是,旋转无法正常工作。有人可以指出我正确的方向吗?
import sys
from PyQt5.QtWidgets import QMainWindow, QApplication, QGraphicsView
from PyQt5 import QtGui, QtWidgets, QtCore
import math
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.setFixedSize(850, 600)
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)
self.setTransformOriginPoint(self.boundingRect().center())
def set_pixmap(self):
pixmap = QtGui.QPixmap("image.jpg")
self.setPixmap(pixmap)
self.pixmap_controller = PixmapController(self)
self.pixmap_controller.set_pixmap_controller()
class PixmapController(QtWidgets.QGraphicsEllipseItem):
def __init__(self, pixmap):
super(PixmapController, self).__init__(parent=pixmap)
self.pixmap = pixmap
color = QtGui.QColor(0, 0, 0)
brush = QtGui.QBrush(color)
self.setBrush(brush)
def set_pixmap_controller(self):
self.setRect(-5, -5, 10, 10)
def mousePressEvent(self, event):
if event.button() == QtCore.Qt.LeftButton:
self.startPos = event.pos()
def mouseMoveEvent(self, event):
if event.buttons() == QtCore.Qt.LeftButton:
self.finalPos = event.pos()
delta = self.finalPos - self.startPos
item_position = self.pixmap.transformOriginPoint()
angle = math.atan2(item_position.y() - self.finalPos.y(), item_position.x() - self.finalPos.x()) / math.pi * 180 - 45
self.parentItem().setRotation(angle)
self.parentItem().setPos(self.parentItem().pos() + delta)
if __name__ == "__main__":
app = QApplication(sys.argv)
window = MainWindow()
window.show()
sys.exit(app.exec_())