在 QWidget (pyqt5) 上的 QPixmap 上绘制点 [英] Drawing points on QPixmap on QWidget (pyqt5)

问题描述

我有一个带有 QLayout 的 QWidget，上面有一个 QLabel.我在标签上设置了 QPixmap.无论用户在何处单击图像，我都想画一个点.我定义了 mouseReleaseEvent(有效)和paintEvent(但没有绘制点).我已经阅读了所有类似的问题，但没有一个解决方案对我有用.有什么帮助吗?我的相关代码:

I have a QWidget with a QLayout on which there is a QLabel. I set a QPixmap on the label. Wherever the user clicks on the image, I want to draw a point. I defined mouseReleaseEvent (which works) and paintEvent (but no points are drawn). I've read all similar questions and none of the solutions worked for me. Any help? My relevant code:

class ImageScroller(QtWidgets.QWidget):

    def __init__(self, img):
        QtWidgets.QWidget.__init__(self)
        main_layout = QtWidgets.QVBoxLayout()
        self._image_label = QtWidgets.QLabel()
        self._set_image(img)
        main_layout.addWidget(self._image_label)
        main_layout.addStretch()
        self.setLayout(main_layout)

    def _set_image(self, img):
        img = qimage2ndarray.array2qimage(img)
        qimg = QtGui.QPixmap.fromImage(img)
        self._img_pixmap = QtGui.QPixmap(qimg)
        self._image_label.show()

    def paintEvent(self, paint_event):
        painter = QtGui.QPainter(self)
        painter.begin(self)
        painter.setPen(QtGui.QPen(QtCore.Qt.red))
        pen = QtGui.QPen()
        pen.setWidth(20)
        painter.setPen(pen)
        painter.setRenderHint(QtGui.QPainter.Antialiasing, True)
        painter.drawPoint(300,300)
        painter.drawLine(100, 100, 400, 400)
        for pos in self.chosen_points:
            painter.drawPoint(pos)
        painter.end()

    def mouseReleaseEvent(self, cursor_event):
        self.chosen_points.append(QtGui.QCursor().pos())
        self.update()

推荐答案

当您使用 QtGui.QCursor.pos() 时正在获取光标相对于屏幕的坐标，但是当您使用 QtGui.QCursor.pos() 时要绘制一个小部件，您必须在小部件的坐标中，因为小部件具有 mapToGlobal() 方法:

When you use QtGui.QCursor.pos() is getting the coordinates of the cursor with respect to the screen, but when you want to paint a widget you must be in the coordinates of the widget, for it the widget has the mapToGlobal() method:

self.mapFromGlobal(QtGui.QCursor.pos())

但在这种情况下还有另一种解决方案，您必须使用返回mouseReleaseEvent的事件，该事件在pos()方法中具有信息:

But in this case there is another solution, you must use the event that returns mouseReleaseEvent that has the information in the pos() method:

cursor_event.pos()

另一个问题是你创建的标签在widget上方所以你看不到点，最简单的就是用drawPixmap()QPixmap> 方法.

Another problem is that the label you created is above the widget so you do not see the points, the easiest thing is to draw the QPixmap directly with the drawPixmap() method.

完整代码:

from PyQt5 import QtWidgets, QtGui, QtCore


class ImageScroller(QtWidgets.QWidget):
    def __init__(self):
        self.chosen_points = []
        QtWidgets.QWidget.__init__(self)
        self._image = QtGui.QPixmap("image.png")

    def paintEvent(self, paint_event):
        painter = QtGui.QPainter(self)
        painter.drawPixmap(self.rect(), self._image)
        pen = QtGui.QPen()
        pen.setWidth(20)
        painter.setPen(pen)
        painter.setRenderHint(QtGui.QPainter.Antialiasing, True)
        painter.drawPoint(300, 300)
        painter.drawLine(100, 100, 400, 400)
        for pos in self.chosen_points:
            painter.drawPoint(pos)

    def mouseReleaseEvent(self, cursor_event):
        self.chosen_points.append(cursor_event.pos())
        # self.chosen_points.append(self.mapFromGlobal(QtGui.QCursor.pos()))
        self.update()


if __name__ == '__main__':
    import sys

    app = QtWidgets.QApplication(sys.argv)
    w = ImageScroller()
    w.resize(640, 480)
    w.show()
    sys.exit(app.exec_())

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