We know that we want to have a total of five map layers in our application. The basemap layer will display the basemap.tif file we just downloaded, while the track layer will use a SpatiaLite database to store and display the track data entered by the user. The remaining map layers will display temporary features held in memory.
Let's start by defining a new method in our forestTrails.py module to initialize the SpatiaLite database we will use for the track layer:
def setupDatabase(self):
cur_dir = os.path.dirname(os.path.realpath(__file__))
dbName = os.path.join(cur_dir, "data", "tracks.sqlite")
if not os.path.exists(dbName):
fields = QgsFields()
fields.append(QgsField("id", QVariant.Int))
fields.append(QgsField("type", QVariant.String))
fields.append(QgsField("name", QVariant.String))
fields.append(QgsField("direction", QVariant.String))
fields.append(QgsField("status...