我正在制作一个显示一个区域地图的应用程序,我正在尝试在它上面绘制节点,这些节点可以代表信息。
我让这一切都工作,但这样做只是通过制作一个自定义的小部件,我显示和打印一切一次又一次每次信息改变。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。
这让我想要改革我的GUI,现在我正试图使每个类一个自定义小部件!但是有一个问题,我的MapNodes不再显示了。
我搜索了stackoverflow,发现了这个有用的线程:如何在qt
中设置小部件的绝对位置所以我必须给我的mapnodes一个parent, parent =正在显示的小部件(?)
无论如何,这是我的尝试,将相关代码粘贴在这里。提示可能出现严重错误的地方:所有的initapp = 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-我忘记添加添加节点的代码。因此,在需要创建节点的事件出现后,该方法触发创建节点:
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()
我建议您在地图中使用QGraphicsScene和QGraphicsItem类,而不是普通的QWidget类,因为它们正是为了显示大量图形项而制作的:
- QGraphicsScene http://doc.qt.io/qt-5/qgraphicsscene.html
- QGraphicsItem: http://doc.qt.io/qt-5/qgraphicsitem-members.html
来自文档:
QGraphicsScene类提供了一个用于管理大量2D图形项的表面。
类用作QGraphicsItems的容器。它与QGraphicsView一起用于在2D表面上可视化图形项,如线条、矩形、文本,甚至自定义项。QGraphicsScene是图形视图框架的一部分。
QGraphicsScene还提供了一些功能,可以让您有效地确定项目的位置,并确定在场景的任意区域内哪些项目是可见的。使用QGraphicsView小部件,您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来自QWidget的小部件,这应该允许您显示几乎任何类型的信息。作为奖励,您将获得分层、快速转换和随时可用的鼠标交互处理,这对于实现交互式地图应该非常有用。