PYQT如何在两个按钮之间画线答案

【问题标题】：PYQT how to draw line between two buttonsPYQT如何在两个按钮之间画线
【发布时间】：2019-04-20 18:18:40
【问题描述】：

from PyQt4 import QtGui, QtCore

class Window(QtGui.QWidget):
    def __init__(self):
        QtGui.QWidget.__init__(self)
        self.view = View(self)
        self.button = QtGui.QPushButton('Clear View', self)
        self.button.clicked.connect(self.handleClearView)
        layout = QtGui.QVBoxLayout(self)
        layout.addWidget(self.view)
        layout.addWidget(self.button)


    def handleClearView(self):
        self.view.scene().clear()

class DragButton(QtGui.QPushButton):

    def mousePressEvent(self, event):
        self.__mousePressPos = None
        self.__mouseMovePos = None
        if event.button() == QtCore.Qt.LeftButton:
            self.__mousePressPos = event.globalPos()
            self.__mouseMovePos = event.globalPos()

        #super(DragButton, self).mousePressEvent(event)

    def mouseMoveEvent(self, event):
        if event.buttons() == QtCore.Qt.LeftButton:
            # adjust offset from clicked point to origin of widget
            currPos = self.mapToGlobal(self.pos())
            globalPos = event.globalPos()
            diff = globalPos - self.__mouseMovePos
            newPos = self.mapFromGlobal(currPos + diff)
            self.move(newPos)
            self.__mouseMovePos = globalPos

        #super(DragButton, self).mouseMoveEvent(event)

    def mouseReleaseEvent(self, event):
        if self.__mousePressPos is not None:
            moved = event.globalPos() - self.__mousePressPos 
            if moved.manhattanLength() > 3:
                event.ignore()
                return

        #super(DragButton, self).mouseReleaseEvent(event)

class View(QtGui.QGraphicsView):
    def __init__(self, parent):
        QtGui.QGraphicsView.__init__(self, parent)
        self.setScene(QtGui.QGraphicsScene(self))
        self.setSceneRect(QtCore.QRectF(self.viewport().rect()))
        btn1=DragButton('Test1', self)
        btn2=DragButton('Test2', self)

    def mousePressEvent(self, event):
        self._start = event.pos()

    def mouseReleaseEvent(self, event):
        start = QtCore.QPointF(self.mapToScene(self._start))
        end = QtCore.QPointF(self.mapToScene(event.pos()))
        self.scene().addItem(
            QtGui.QGraphicsLineItem(QtCore.QLineF(start, end)))
        for point in (start, end):
            text = self.scene().addSimpleText(
                '(%d, %d)' % (point.x(), point.y()))
            text.setBrush(QtCore.Qt.red)
            text.setPos(point)

if __name__ == '__main__':

    import sys
    app = QtGui.QApplication(sys.argv)
    window = Window()
    window.resize(640, 480)
    window.show()
    sys.exit(app.exec_())

这是我的代码。 QGraphicsView 上有两个可移动的按钮，我可以通过鼠标拖动在 QGraphicsView 上画线。但我想做的是在两个按钮之间画线。具体来说，如果我右键单击 btn1(Test1) ，然后右键单击 btn2(Test2) ，则会在两个按钮之间创建一条线。我为这个问题苦苦挣扎了一个月。请帮忙！

【问题讨论】：

标签： python-3.x pyqt4

【解决方案1】：

我假设您需要在按钮之间绘制的线也必须是可移动的。如果不是，这很简单，您可以使用：

lines = QtGui.QPainter()
lines.setPen(self)
lines.drawLine(x1,y1,x2,y2)

因此，如果线条需要与按钮一起移动，那么首先您创建一个由两个按钮和线条组成的迷你小部件，这样您就可以移动整个小部件。 This might help!，在这种情况下。

【讨论】：