1. addVectorLayer接口调用1). QgisInterface提供接口addVectorLayer用以添加矢量图层,该接口由QgisAppInterface实现QgisInterface::addVectorLayer()↓ 实现 QgisAppInterface::addVectorLayer() 2).QgisAppInterface::addVectorLayer()内调用QgisApp::addVectorLayer()Qgis...
制作一个choropleth地图,显示美国大陆的地震风险 选择Layer>Add Layer>Add Vector Layer...或单击此图标: 在对话框中,单击下面带有三个点的按钮,Source然后导航到文件seismic。选择带有.shp扩展名的文件很重要。然后单击Add,Close将出现以下地图,并用随机颜色填充: 在Layers左侧面板应该显示seismic层。您可以通过取消选...
# 需要导入模块: from qgis.core import QgsVectorLayer [as 别名]# 或者: from qgis.core.QgsVectorLayer importaddExpressionField[as 别名]deftest_ExpressionFieldEllipsoidAreaCalculation(self):#create a temporary layertemp_layer = QgsVectorLayer("Polygon?crs=epsg:3111&field=pk:int","vl","memory") ...
# 需要导入模块: from qgis.core import QgsVectorLayer [as 别名]# 或者: from qgis.core.QgsVectorLayer importaddFeature[as 别名]def__createMemoryLayer(self, layer_name, gtype, geometries, attributes, fNames, fTypes):""" Create a memory layer from parameters :param layer_name: name for the...
Feature description Currently, QGIS lacks caching support for Vector Tiles. When loading a Vector Tile layer and slightly panning or zooming the map, QGIS sends a new request to the server, even if the requested tiles are identical to th...
https://qgis.org/pyqgis/master/core/QgsVectorLayerUtils.html?highlight=qgsvectorlayerutils#qgis.core.QgsVectorLayerUtils.createFeatureTHAT one takes the expression context into account! So: Given an editable layer 'layer' and a valid 'geom": ...
>https://qgis.org/pyqgis/master/core/QgsVectorLayerUtils.html?highlight=qgsvectorlayerutils#qgis.core.QgsVectorLayerUtils.createFeature> > THAT one takes the expression context into account! > > So: > Given an editable layer 'layer' and a valid 'geom": ...
QgsFeaturePool( QgsVectorLayer *layer ); %Docstring Creates a new feature pool for ``layer``. Must be created on the same thread as ``layer``. %End virtual ~QgsFeaturePool(); @@ -38,19 +40,36 @@ Creates a new feature pool for ``layer``. Retrieves the feature with the specified...
直接用代码来说明 <%@ Page Language="C#" AutoEventWireup="true" CodeBehind="MaskTest.aspx.cs" ...
Vector layercontains geo-objects (entities with geometry attributes). To add a layer on a map declare thelayerselement and its configuration in thegeoMapelement in the XML descriptor. Here is an example of one raster layer and two vector layers. ...