Python QgsRubberBand.removeLastPoint方法代码示例

# 需要导入模块: from qgis.gui import QgsRubberBand [as 别名]
# 或者: from qgis.gui.QgsRubberBand import removeLastPoint [as 别名]
class DrawPolygon(QgsMapTool):
    '''Outil de sélection par polygone, tiré de selectPlusFr'''

    selectionDone = pyqtSignal()
    move = pyqtSignal()

    def __init__(self, iface, couleur):
        canvas = iface.mapCanvas()
        QgsMapTool.__init__(self, canvas)
        self.canvas = canvas
        self.iface = iface
        self.status = 0
        self.rb = QgsRubberBand(self.canvas, QgsWkbTypes.PolygonGeometry)
        self.rb.setColor(couleur)
        return None

    def keyPressEvent(self, e):
        if e.matches(QKeySequence.Undo):
            if self.rb.numberOfVertices() > 1:
                self.rb.removeLastPoint()

    def canvasPressEvent(self, e):
        if e.button() == Qt.LeftButton:
            if self.status == 0:
                self.rb.reset(QgsWkbTypes.PolygonGeometry)
                self.status = 1
            self.rb.addPoint(self.toMapCoordinates(e.pos()))
        else:
            if self.rb.numberOfVertices() > 2:
                self.status = 0
                self.selectionDone.emit()
            else:
                self.reset()
        return None

    def canvasMoveEvent(self, e):
        if self.rb.numberOfVertices() > 0 and self.status == 1:
            self.rb.removeLastPoint(0)
            self.rb.addPoint(self.toMapCoordinates(e.pos()))
        self.move.emit()
        return None

    def reset(self):
        self.status = 0
        self.rb.reset(True)

    def deactivate(self):
        self.rb.reset(True)
        QgsMapTool.deactivate(self)

# 需要导入模块: from qgis.gui import QgsRubberBand [as 别名]
# 或者: from qgis.gui.QgsRubberBand import removeLastPoint [as 别名]
class LineMapTool(QgsMapTool):

    def __init__(self, iface, settings, action, index_action):  
        ''' Class constructor '''
        
        self.iface = iface
        self.canvas = self.iface.mapCanvas()
        self.settings = settings
        self.index_action = index_action
        self.elem_type_type = self.settings.value('insert_values/'+str(index_action)+'_elem_type_type')           
        QgsMapTool.__init__(self, self.canvas)
        self.setAction(action)

        # Set rubber band features
        self.rubberBand = QgsRubberBand(self.canvas, QGis.Line)
        mFillColor = QColor(255, 0, 0);
        self.rubberBand.setColor(mFillColor)
        self.rubberBand.setWidth(2)
        self.reset()        
        
        # Vertex marker
        self.vertexMarker = QgsVertexMarker(self.canvas)
        self.vertexMarker.setColor(QColor(0, 255, 0))
        self.vertexMarker.setIconSize(9)
        self.vertexMarker.setIconType(QgsVertexMarker.ICON_BOX) # or ICON_CROSS, ICON_X
        self.vertexMarker.setPenWidth(5)

        # Snapper
        self.snapper = QgsMapCanvasSnapper(self.canvas)

        # Control button state
        self.mCtrl = False
        self.started = False
        
        # Tracing options
        self.firstTimeOnSegment = True
        self.lastPointMustStay = False
        self.lastPoint = None
        
        # Change map tool cursor
        self.cursor = QCursor()
        self.cursor.setShape(Qt.CrossCursor)
        self.parent().setCursor(self.cursor)                                             
 
 
    def keyPressEvent(self,  event):
        ''' We need to know, if ctrl-key is pressed '''
        if event.key() == Qt.Key_Control:
            self.mCtrl = True


    def keyReleaseEvent(self,  event):
        ''' Ctrl-key is released '''
        if event.key() == Qt.Key_Control:
            self.mCtrl = False
        
        # Remove the last added point when the delete key is pressed
        if event.key() == Qt.Key_Backspace:
            self.rubberBand.removeLastPoint()
       

    def reset(self):
        self.start_point = self.end_point = None
        self.isEmittingPoint = False
        self.rubberBand.reset(QGis.Line)
                       
    
    
    ''' QgsMapTools inherited event functions '''
        
    def canvasPressEvent(self, event):
        ''' On left click, we add a point '''
        
        if event.button()  ==  1:
            # layer = self.canvas.currentLayer()
            layer = self.iface.activeLayer() 
    
            # Declare, that are we going to work
            self.started = True
            
            if layer <> None:
                x = event.pos().x()
                y = event.pos().y()
                selPoint = QPoint(x,y)
    
                # Check something snapped
                (retval,result) = self.snapper.snapToBackgroundLayers(selPoint) #@UnusedVariable
              
                # The point we want to have, is either from snapping result
                if result <> []:
                    point = result[0].snappedVertex
    
                    # If we snapped something, it's either a vertex
                    if result[0].snappedVertexNr <> -1:
                        self.firstTimeOnSegment = True
                
                    # Or a point on a segment, so we have to declare, that a point on segment is found
                    else:
                        self.firstTimeOnSegment = False
    
#.........这里部分代码省略.........