def canvasPressEvent(self, event):
''' Get point and transform to map coordinates '''
# Set the active vector layer. Note that this method cannot be called unless the
# currently active layer is the correct editing layer for the scenario edit type.
self.activeVLayer = self.mainwindow.activeVLayer
if self.activeVLayer == None: return
qPoint = event.pos()
transform = self.canvas.getCoordinateTransform()
# returns a QgsPoint object in map coordinates
self.qgsPoint = transform.toMapCoordinates(qPoint.x(), qPoint.y())
#debugging
print "Tools.addpoints.AddPoints().canvasPressEvent(): The original clicked point in map coordinates is " + str(self.qgsPoint)
'''
Check constraints on the added point for the scenario edit type,
and prompt the user if constraints are not met.
'''
# If the point is a culvert/bridge, check if it can be snapped to a new road in the scenario.
if self.mainwindow.scenarioEditType == config.scenarioEditTypesList[0]:
# returns the snapped qgs point if the point can be snapped to a new road, or returns False
retval = shared.snapToNewRoad(self.mainwindow, qPoint)
if retval:
self.qgsPoint = retval # if the point is returned, set it to be the new feature's geometry
# If not editing a new road check constraints.
# This method returns False if the constraints are not met.
if not shared.checkConstraints(self.mainwindow, self.qgsPoint, qPoint):
self.qgsPoint = None
return
# correct editing layer selected and constraints check OK so get the new attributes
else: self.getNewAttributes()
def canvasPressEvent(self, event):
''' Get point and transform to map coordinates '''
# get the current activeVLayer from mainwindow
self.activeVLayer = self.mainwindow.activeVLayer
if self.activeVLayer == None:
return
point = event.pos()
transform = self.canvas.getCoordinateTransform()
# returns a QgsPoint object in map coordinates
self.qgsPoint = transform.toMapCoordinates(point.x(), point.y())
print "The point is " + str(self.qgsPoint)
# check if the proper editing layer is selected
currentLayerName = self.mainwindow.legend.currentItem().canvasLayer.layer().name()
if shared.checkSelectedLayer(self.mainwindow, self.mainwindow.scenarioType,
currentLayerName) == "Cancel":
self.qgsPoint = None
return # if wrong edit layer cancel drawing
# Check constraints on the added point for the scenario edit type
# and prompt the user if constraints are not met. Method returns False
# if the constraints are not met.
if not shared.checkConstraints(self.mainwindow, self.qgsPoint):
self.qgsPoint = None
return
else: pass
# correct editing layer selected and constraints check OK so get the new attributes
self.getNewAttributes()
def canvasReleaseEvent(self, event):
''' Handle the mouse release event '''
# debugging
print"Tools.addlinespolygons.AddLinesPolygons.canvasReleaseEvent()"
if self.down == True:
if (self.started == False) and (event.button()== QtCore.Qt.RightButton):
# We have a right button but have not started a poly... just return
return
# mouse is released so initialize rubber band
if self.started==False:
# Initialize Rubber Band
self.rubberBand = QgsRubberBand(self.canvas, self.geom)
self.rubberBand.setWidth(5)
self.rubberBand.show()
self.numberOfPoints = 0
# getCoordinateTransform returns a QgsMapToPixel object
# which transforms between device coordinates and map coordinates
transform = self.canvas.getCoordinateTransform()
# toMapCoordinates is a QgsMapToPixel method that
# takes a QPoint (from device) as a parameter and returns a
# QgsPoint object transformed to map coordinates
self.qgsPoint = transform.toMapCoordinates(event.pos().x(),
event.pos().y())
# We have the first point of either a line or polygon. If it is a line then it is a new road
# so check constraints for new roads. This method will also check if the point is near a
# previously saved new road and snap to it if it is.
if self.started == False: # only checks the first point
qPoint = event.pos()
if self.geom == False:
# prompts user and returns false if constraints not met
if not shared.checkConstraints(self.mainwindow, self.qgsPoint, qPoint):
return
self.rubberBand.addPoint(self.qgsPoint)
self.started=True
self.numberOfPoints = self.numberOfPoints + 1
if self.geom: # polygon
if (event.button() == QtCore.Qt.RightButton) and (self.numberOfPoints > 2):
#self.down=False
#self.started=False
self.getNewAttributes()
else: # line
if (event.button() == QtCore.Qt.RightButton) and (self.numberOfPoints > 1):
#self.down=False
#self.started=False
self.getNewAttributes()