PyQt - 在小部件上显示小部件

时间:2013-05-14 13:51:51

标签: python qt user-interface pyqt qwidget

我正在创建一个显示区域地图的应用程序,我正在尝试在其上绘制可以表示信息的节点。

我完成了所有工作,但只是通过制作一个我展示的自定义小部件并在每次信息更改时一次又一次地打印所有内容。此外,我无法将节点“连接”到侦听器,因为它们只是原始小部件中的图像。

这让我想改进我的GUI,现在我想让每个类都成为一个自定义小部件!但是有一个问题,我的MapNodes不再出现了。

我搜索了stackoverflow并找到了这个有用的帖子: How to set absolute position of the widgets in qt

所以我必须给我的mapnodes一个父级,而parent =正在显示的小部件(?)

无论如何,这是我的投入,在此粘贴相关代码。提示哪些东西可能会出错:所有的内容

app = QtGui.QApplication(list())
mutexbranch = Lock()
mutexnode = Lock()

def exec():
    return app.exec_()

#Singleton Pattern: wanneer en object aan iets moet kunnen
#                   waar het inherent door de structuur niet aankon
#                   wordt dit via dit singleton opgelost
class GuiInternalCommunication:
    realmap = 0


class MapView(QtGui.QWidget, listener.Listener):
    def __init__(self, mapimagepath):
        QtGui.QMainWindow.__init__(self)
        listener.Listener.__init__(self)

        self.map = Map(self, mapimagepath)
        #self.setCentralWidget(self.map)

        self.initUI()


    def initUI(self):
        self.setWindowTitle('Population mapping')

        hbox = QtGui.QHBoxLayout()
        hbox.addWidget(self.map)

        self.setLayout(hbox)

        resolution = QtGui.QDesktopWidget().screenGeometry()
        self.setGeometry(20,20,550,800)
        self.show()



######################################################################

class Map(QtGui.QWidget):
    def __init__(self, parent, mapimagepath):
        QtGui.QWidget.__init__(self, parent)

        #self.timer = QtCore.QBasicTimer()

        #coordinaten hoeken NE en SW voor kaart in map graphics van SKO 
        self.realmap = RealMap( 
            mapimagepath,
            (51.0442, 3.7268), 
            (51.0405, 3.7242),
            550, 
            800)
        GuiInternalCommunication.realmap = self.realmap

        self.needsupdate = True
        self.timelabel = 0

        parent.setGeometry(0,0,self.realmap.width, self.realmap.height)

        self.mapNodes = {}
        self.mapBranches = {}

    def paintEvent(self, event):
        painter = QtGui.QPainter()
        painter.begin(self)
        rect = self.contentsRect()

        #teken achtergrond
        self.realmap.drawRealMap(painter)

        #teken branches
        mutexbranch.acquire()
        try:
            for branch, mapBranch in self.mapBranches.items():
                mapBranch.drawMapBranch(painter)
        finally:
            mutexbranch.release()           



######################################################################

class RealMap(QtGui.QWidget):
    def __init__(self, path, coordRightTop, coordLeftBot, width, height, pixpermet = 2.6):
        super(RealMap, self).__init__()
        self.path = path
        self.mapimage = QtGui.QImage(self.path)
        self.coordLeftBot = coordLeftBot
        self.coordRightTop = coordRightTop

        self.width = width
        self.height = height

        self.realdim = self.calcRealDim()

        self.pixpermet = pixpermet

    def paintEvent(self, e):
        painter = QtGui.QPainter()
        painter.begin(self)
        self.drawRealMap(self, painter)
        painter.end()

    def drawRealMap(self, painter):
        painter.drawImage(0,0,self.mapimage)


######################################################################

class MapNode(QtGui.QWidget):
    dangertocolor = {"normal":"graphics//gradients//green.png",
                    "elevated":"graphics//gradients//orange.png",
                    "danger":"graphics//gradients//red.png"}

    gradimage = {"normal":QtGui.QImage(dangertocolor["normal"]),
                    "elevated":QtGui.QImage(dangertocolor["elevated"]),
                    "danger":QtGui.QImage(dangertocolor["danger"])}
    btimage = QtGui.QImage("graphics//BT-icon.png")

    def __init__(self, scanner, x, y, danger = 0, parent = None):
        # MapNode erft over van QWidget
        super(MapNode, self).__init__()
        QtGui.QWidget.__init__(self, parent)

        self.scanner = scanner
        self.x = x
        self.y = y
        self.danger = 'normal'
        self.calcDanger(danger)

        self.grads = {}
        self.grad = QtGui.QImage(MapNode.dangertocolor[self.danger])


    def paintEvent(self, e):
        painter = QtGui.QPainter()
        painter.begin(self)
        self.drawMapNode(painter)
        painter.end()

    def drawMapNode(self, painter):
        realmap = GuiInternalCommunication.realmap
        radiusm = self.scanner.range
        radiusp = radiusm*realmap.pixpermet
        factor = radiusp/200        # basis grootte gradiënten is 200 pixels.

        grad = MapNode.gradimage[self.danger]
        grad = grad.scaled(grad.size().width()*factor, grad.size().height()*factor)

        painter.drawImage(self.x-100*factor,self.y-100*factor, grad)
        painter.drawImage(self.x-10, self.y-10,MapNode.btimage)
        painter.drawText(self.x-15, self.y+20, str(self.scanner.sensorid) + '-' + str(self.scanner.name))


######################################################################

class MapBranch:
    branchpens = {"normal": QtGui.QPen(QtCore.Qt.green, 3, QtCore.Qt.DashLine),
                "elevated": QtGui.QPen(QtGui.QColor(255, 51, 0), 3, QtCore.Qt.DashLine), #mandarine orange hex is 255-165-0 
                "danger": QtGui.QPen(QtCore.Qt.red, 3, QtCore.Qt.DashLine)}

    def __init__(self, branch, mapnode1, mapnode2, danger = 0):
        self.mapnode1 = mapnode1
        self.mapnode2 = mapnode2
        self.branch = branch
        self.danger = danger

        self.calcDanger(danger)

    def drawMapBranch(self, painter):
        painter.setPen(MapBranch.branchpens[self.danger])
        painter.drawLine(self.mapnode1.x, 
                        self.mapnode1.y,
                        self.mapnode2.x,
                        self.mapnode2.y)

编辑 - 我忘了添加添加节点的代码。因此,在需要创建节点之后,此方法将触发创建节点:

def addNode(self, scanner):
    mutexnode.acquire()
    try:
        coord = self.realmap.convertLatLon2Pix((scanner.latitude, scanner.longitude))
        self.mapNodes[scanner.sensorid] = MapNode(scanner, coord[0], coord[1], parent = self)
        self.mapNodes[scanner.sensorid].move(coord[0],coord[1])
        #self.mapNodes[scanner.sensorid].show()
    finally:
        mutexnode.release()

1 个答案:

答案 0 :(得分:3)

我建议你使用QGraphicsScene和QGraphicsItem类来代替普通的QWidget类,因为它们是为了显示大量的图形项目而制作的:

来自文档:

  

QGraphicsScene类提供了一个用于管理大量2D图形项的表面。

     

该类充当QGraphicsItems的容器。它与QGraphicsView一起用于在2D表面上可视化图形项目,例如线条,矩形,文本甚至自定义项目。 QGraphicsScene是Graphics View Framework的一部分。

     

QGraphicsScene还提供了一些功能,可让您有效地确定项目的位置,以及确定哪些项目在场景中的任意区域内可见。使用QGraphicsView小部件,您既可以可视化整个场景,也可以放大并仅查看场景的一部分。

您还可以在场景中嵌入从QWidget派生的小部件,这样您就可以显示任何类型的信息。作为奖励,您将获得分层,快速转换和即时使用的鼠标交互处理,这对于实现交互式地图非常有用。