Python core.QgsJsonUtils类代码示例

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本文整理汇总了Python中qgis.core.QgsJsonUtils类的典型用法代码示例。如果您正苦于以下问题：Python QgsJsonUtils类的具体用法？Python QgsJsonUtils怎么用？Python QgsJsonUtils使用的例子？那么恭喜您, 这里精选的类代码示例或许可以为您提供帮助。

在下文中一共展示了QgsJsonUtils类的5个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于我们的系统推荐出更棒的Python代码示例。

示例1: testStringToFields

    def testStringToFields(self):
        """test retrieving fields from GeoJSON strings"""

        # empty string
        fields = QgsJsonUtils.stringToFields("", codec)
        self.assertEqual(fields.count(), 0)

        # bad string
        fields = QgsJsonUtils.stringToFields("asdasdas", codec)
        self.assertEqual(fields.count(), 0)

        # geojson string
        fields = QgsJsonUtils.stringToFields('{\n"type": "Feature","geometry": {"type": "Point","coordinates": [125, 10]},"properties": {"name": "Dinagat Islands","height":5.5}}', codec)
        self.assertEqual(fields.count(), 2)
        self.assertEqual(fields[0].name(), "name")
        self.assertEqual(fields[0].type(), QVariant.String)
        self.assertEqual(fields[1].name(), "height")
        self.assertEqual(fields[1].type(), QVariant.Double)

开发者ID:，项目名称:，代码行数:18，代码来源:

示例2: testStringToFeatureList

    def testStringToFeatureList(self):
        """Test converting json string to features"""

        fields = QgsFields()
        fields.append(QgsField("name", QVariant.String))

        # empty string
        features = QgsJsonUtils.stringToFeatureList("", fields, codec)
        self.assertEqual(features, [])

        # bad string
        features = QgsJsonUtils.stringToFeatureList("asdasdas", fields, codec)
        self.assertEqual(features, [])

        # geojson string with 1 feature
        features = QgsJsonUtils.stringToFeatureList('{\n"type": "Feature","geometry": {"type": "Point","coordinates": [125, 10]},"properties": {"name": "Dinagat Islands"}}', fields, codec)
        self.assertEqual(len(features), 1)
        self.assertFalse(features[0].geometry().isNull())
        self.assertEqual(features[0].geometry().wkbType(), QgsWkbTypes.Point)
        point = features[0].geometry().constGet()
        self.assertEqual(point.x(), 125.0)
        self.assertEqual(point.y(), 10.0)
        self.assertEqual(features[0]['name'], "Dinagat Islands")

        # geojson string with 2 features
        features = QgsJsonUtils.stringToFeatureList('{ "type": "FeatureCollection","features":[{\n"type": "Feature","geometry": {"type": "Point","coordinates": [125, 10]},"properties": {"name": "Dinagat Islands"}}, {\n"type": "Feature","geometry": {"type": "Point","coordinates": [110, 20]},"properties": {"name": "Henry Gale Island"}}]}', fields, codec)
        self.assertEqual(len(features), 2)
        self.assertFalse(features[0].geometry().isNull())
        self.assertEqual(features[0].geometry().wkbType(), QgsWkbTypes.Point)
        point = features[0].geometry().constGet()
        self.assertEqual(point.x(), 125.0)
        self.assertEqual(point.y(), 10.0)
        self.assertEqual(features[0]['name'], "Dinagat Islands")
        self.assertFalse(features[1].geometry().isNull())
        self.assertEqual(features[1].geometry().wkbType(), QgsWkbTypes.Point)
        point = features[1].geometry().constGet()
        self.assertEqual(point.x(), 110.0)
        self.assertEqual(point.y(), 20.0)
        self.assertEqual(features[1]['name'], "Henry Gale Island")

开发者ID:，项目名称:，代码行数:39，代码来源:

示例3: testExportAttributes

    def testExportAttributes(self):
        """ test exporting feature's attributes to JSON object """
        fields = QgsFields()

        # test empty attributes
        feature = QgsFeature(fields, 5)
        expected = "{}"
        self.assertEqual(QgsJsonUtils.exportAttributes(feature), expected)

        # test feature with attributes
        fields.append(QgsField("name", QVariant.String))
        fields.append(QgsField("cost", QVariant.Double))
        fields.append(QgsField("population", QVariant.Int))

        feature = QgsFeature(fields, 5)
        feature.setGeometry(QgsGeometry(QgsPoint(5, 6)))
        feature.setAttributes(['Valsier Peninsula', 6.8, 198])

        expected = """{"name":"Valsier Peninsula",
"cost":6.8,
"population":198}"""
        self.assertEqual(QgsJsonUtils.exportAttributes(feature), expected)

        # test using field formatters
        source = QgsVectorLayer("Point?field=fldtxt:string&field=fldint:integer",
                                "parent", "memory")
        pf1 = QgsFeature()
        pf1.setFields(source.fields())
        pf1.setAttributes(["test1", 1])

        setup = QgsEditorWidgetSetup('ValueMap', {"map": {"one": 1, "two": 2, "three": 3}})
        source.setEditorWidgetSetup(1, setup)

        expected = """{"fldtxt":"test1",
"fldint":"one"}"""
        self.assertEqual(QgsJsonUtils.exportAttributes(pf1, source), expected)

开发者ID:，项目名称:，代码行数:36，代码来源:

示例4: testEncodeValue

 def testEncodeValue(self):
     """ test encoding various values for use in GeoJSON strings """
     self.assertEqual(QgsJsonUtils.encodeValue(NULL), 'null')
     self.assertEqual(QgsJsonUtils.encodeValue(5), '5')
     self.assertEqual(QgsJsonUtils.encodeValue(5.9), '5.9')
     self.assertEqual(QgsJsonUtils.encodeValue(5999999999), '5999999999')
     self.assertEqual(QgsJsonUtils.encodeValue('string'), '"string"')
     self.assertEqual(QgsJsonUtils.encodeValue('str\ning'), '"str\\ning"')
     self.assertEqual(QgsJsonUtils.encodeValue('str\ring'), '"str\\ring"')
     self.assertEqual(QgsJsonUtils.encodeValue('str\bing'), '"str\\bing"')
     self.assertEqual(QgsJsonUtils.encodeValue('str\ting'), '"str\\ting"')
     self.assertEqual(QgsJsonUtils.encodeValue('str\\ing'), '"str\\\\ing"')
     self.assertEqual(QgsJsonUtils.encodeValue('str\\ning'), '"str\\\\ning"')
     self.assertEqual(QgsJsonUtils.encodeValue('str\n\\\\ing'), '"str\\n\\\\\\\\ing"')
     self.assertEqual(QgsJsonUtils.encodeValue('str/ing'), '"str\\/ing"')
     self.assertEqual(QgsJsonUtils.encodeValue([5, 6]), '[5,6]')
     self.assertEqual(QgsJsonUtils.encodeValue(['a', 'b', 'c']), '["a","b","c"]')
     self.assertEqual(QgsJsonUtils.encodeValue(['a', 3, 'c']), '["a",3,"c"]')
     self.assertEqual(QgsJsonUtils.encodeValue(['a', 'c\nd']), '["a","c\\nd"]')
     # handle differences due to Qt5 version, where compact output now lacks \n
     enc_str = QgsJsonUtils.encodeValue({'key': 'value', 'key2': 5})
     self.assertTrue(enc_str == '{"key":"value",\n"key2":5}' or enc_str == '{"key":"value","key2":5}')
     enc_str = QgsJsonUtils.encodeValue({'key': [1, 2, 3], 'key2': {'nested': 'nested\\result'}})
     self.assertTrue(enc_str == '{"key":[1,2,3],\n"key2":{"nested":"nested\\\\result"}}' or enc_str == '{"key":[1,2,3],"key2":{"nested":"nested\\\\result"}}')

开发者ID:，项目名称:，代码行数:24，代码来源:

示例5: addFeature

 def addFeature(self):
     text = self.lineEdit.text().strip()
     if text == "":
         return
     layer = self.iface.activeLayer()
     if layer == None:
         return
     try:
         if (self.inputProjection == 0) or (text[0] == '{'):
             # If this is GeoJson it does not matter what inputProjection is
             if text[0] == '{': # This may be a GeoJSON point
                 codec = QTextCodec.codecForName("UTF-8")
                 fields = QgsJsonUtils.stringToFields(text, codec)
                 fet = QgsJsonUtils.stringToFeatureList(text, fields, codec)
                 if (len(fet) == 0) or not fet[0].isValid():
                     raise ValueError('Invalid Coordinates')
                 
                 geom = fet[0].geometry()
                 if geom.isEmpty() or (geom.wkbType() != QgsWkbTypes.Point):
                     raise ValueError('Invalid GeoJSON Geometry')
                 pt = geom.asPoint()
                 lat = pt.y()
                 lon = pt.x()
             elif re.search(r'POINT\(', text) != None:
                 m = re.findall(r'POINT\(\s*([+-]?\d*\.?\d*)\s+([+-]?\d*\.?\d*)', text)
                 if len(m) != 1:
                     raise ValueError('Invalid Coordinates')
                 lon = float(m[0][0])
                 lat = float(m[0][1])
             else:
                 lat, lon = LatLon.parseDMSString(text, self.inputXYOrder)
             srcCrs = epsg4326
         elif self.inputProjection == 1:
             # This is an MGRS coordinate
             text = re.sub(r'\s+', '', unicode(text)) # Remove all white space
             lat, lon = mgrs.toWgs(text)
             srcCrs = epsg4326
         elif self.inputProjection == 4:
             text = text.strip()
             coord = olc.decode(text)
             lat = coord.latitudeCenter
             lon = coord.longitudeCenter
             srcCrs = epsg4326
         else: # Is either the project or custom CRS
             if re.search(r'POINT\(', text) == None:
                 coords = re.split(r'[\s,;:]+', text, 1)
                 if len(coords) < 2:
                     raise ValueError('Invalid Coordinates')
                 if self.inputXYOrder == 0: # Y, X Order
                     lat = float(coords[0])
                     lon = float(coords[1])
                 else:
                     lon = float(coords[0])
                     lat = float(coords[1])
             else:
                 m = re.findall(r'POINT\(\s*([+-]?\d*\.?\d*)\s+([+-]?\d*\.?\d*)', text)
                 if len(m) != 1:
                     raise ValueError('Invalid Coordinates')
                 lon = float(m[0][0])
                 lat = float(m[0][1])
             if self.inputProjection == 2: # Project CRS
                 srcCrs = self.canvas.mapSettings().destinationCrs()
             else:
                 srcCrs = QgsCoordinateReferenceSystem(self.inputCustomCRS)
     except:
         #traceback.print_exc()
         self.iface.messageBar().pushMessage("", "Invalid Coordinate" , level=Qgis.Warning, duration=2)
         return
     self.lineEdit.clear()
     caps = layer.dataProvider().capabilities()
     if caps & QgsVectorDataProvider.AddFeatures:
         destCRS = layer.crs() # Get the CRS of the layer we are adding a point toWgs
         transform = QgsCoordinateTransform(srcCrs, destCRS, QgsProject.instance())
         # Transform the input coordinate projection to the layer CRS
         x, y = transform.transform(float(lon), float(lat))
         feat = QgsFeature(layer.fields())
         feat.setGeometry(QgsGeometry.fromPointXY(QgsPointXY(x, y)))
         if layer.fields().count() == 0:
             layer.addFeature(feat)
             self.lltools.zoomTo(srcCrs, lat, lon)
         else:
             if self.iface.openFeatureForm(layer, feat):
                 layer.addFeature(feat)
                 self.lltools.zoomTo(srcCrs, lat, lon)

开发者ID:NationalSecurityAgency，项目名称:qgis-latlontools-plugin，代码行数:84，代码来源:digitizer.py

注：本文中的qgis.core.QgsJsonUtils类示例由纯净天空整理自Github/MSDocs等源码及文档管理平台，相关代码片段筛选自各路编程大神贡献的开源项目，源码版权归原作者所有，传播和使用请参考对应项目的License；未经允许，请勿转载。

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Python core.QgsJsonUtils类代码示例

示例1: testStringToFields

示例2: testStringToFeatureList

示例3: testExportAttributes

示例4: testEncodeValue

示例5: addFeature

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