|
1
|
Index: source/loadlayer.rst
|
|
2
|
===================================================================
|
|
3
|
--- source/loadlayer.rst (revisión: 15306)
|
|
4
|
+++ source/loadlayer.rst (copia de trabajo)
|
|
5
|
@@ -25,6 +25,11 @@
|
|
6
|
|
|
7
|
vlayer = QgsVectorLayer("/path/to/shapefile/file.shp", "layer_name_you_like", "ogr")
|
|
8
|
|
|
9
|
+* MySQL WKB-based geometries, through OGR - data source is the connection string to the table::
|
|
10
|
+
|
|
11
|
+ uri = "MySQL:dbname,host=localhost,port=3306,user=root,password=xxx|layername=my_table"
|
|
12
|
+ vlayer = QgsVectorLayer( uri, "my_table", "ogr" )
|
|
13
|
+
|
|
14
|
* PostGIS database - data source is a string with all information needed to create a connection to PostgreSQL database. :class:`QgsDataSourceURI` class can generate this string for you.
|
|
15
|
Note that QGIS has to be compiled with Postgres support, otherwise this provider isn't available.
|
|
16
|
::
|
|
17
|
Index: source/vector.rst
|
|
18
|
===================================================================
|
|
19
|
--- source/vector.rst (revisión: 15306)
|
|
20
|
+++ source/vector.rst (copia de trabajo)
|
|
21
|
@@ -575,7 +575,7 @@
|
|
22
|
|
|
23
|
* single symbol renderer (:class:`QgsSingleSymbolRenderer`) --- all features are rendererd with the same symbol.
|
|
24
|
* unique value renderer (:class:`QgsUniqueValueRenderer`) --- symbol for each feature is choosen from attribute value.
|
|
25
|
-* graduated symbol renderer (:class:`QgsGraduatedSymbolRenderer`)
|
|
26
|
+* graduated symbol renderer (:class:`QgsGraduatedSymbolRenderer`) --- a symbol is applied to a subgroup (class) of features, which is calculated on a numeric field
|
|
27
|
* continuous color renderer (:class:`QgsContinuousSymbolRenderer`)
|
|
28
|
|
|
29
|
How to create a point symbol::
|
|
30
|
@@ -624,5 +624,65 @@
|
|
31
|
|
|
32
|
Create graduated symbol renderer::
|
|
33
|
|
|
34
|
- TODO
|
|
35
|
+ # Set the numeric field and the number of classes to be generated
|
|
36
|
+ fieldName = "My_Field"
|
|
37
|
+ numberOfClasses = 5
|
|
38
|
+
|
|
39
|
+ # Get the field index based on the field name
|
|
40
|
+ mFieldMap = {}
|
|
41
|
+ fields = layer.pendingFields()
|
|
42
|
+ for ( key, field ) in fields.iteritems():
|
|
43
|
+ if field.type() == QVariant.Int or field.type() == QVariant.Double:
|
|
44
|
+ mFieldMap[ str( field.name() ) ] = key
|
|
45
|
+ fieldIndex = mFieldMap[ fieldName ]
|
|
46
|
|
|
47
|
+ # Create the renderer object to be associated to the layer later
|
|
48
|
+ renderer = QgsGraduatedSymbolRenderer( layer.geometryType() )
|
|
49
|
+
|
|
50
|
+ # Here you may choose the renderer mode from EqualInterval/Quantile/Empty
|
|
51
|
+ renderer.setMode( QgsGraduatedSymbolRenderer.EqualInterval )
|
|
52
|
+
|
|
53
|
+ # Prepare the required symbol objects
|
|
54
|
+ symbolList = []
|
|
55
|
+ geom = layer.geometryType()
|
|
56
|
+ provider = layer.dataProvider()
|
|
57
|
+ for i in range( numberOfClasses ):
|
|
58
|
+ symbol = QgsSymbol( geom )
|
|
59
|
+ brush = QBrush()
|
|
60
|
+ brush.setColor( self.randomColor() )
|
|
61
|
+ brush.setStyle( Qt.SolidPattern )
|
|
62
|
+ symbol.setBrush( brush )
|
|
63
|
+ symbolList.append( symbol )
|
|
64
|
+
|
|
65
|
+ # Define classes (lower and upper value as well as a label for each class)
|
|
66
|
+ minimum = provider.minimumValue( fieldIndex ).toDouble()[ 0 ]
|
|
67
|
+ maximum = provider.maximumValue( fieldIndex ).toDouble()[ 0 ]
|
|
68
|
+ for i in range( numberOfClasses ):
|
|
69
|
+ # Switch if attribute is int or double
|
|
70
|
+ lower = ('%.*f' % (2, minimum + ( maximum - minimum ) / numberOfClasses * i ) )
|
|
71
|
+ upper = ('%.*f' % (2, minimum + ( maximum - minimum ) / numberOfClasses * ( i + 1 ) ) )
|
|
72
|
+
|
|
73
|
+ lowerString = QVariant( lower ).toString()
|
|
74
|
+ upperString = QVariant( upper ).toString()
|
|
75
|
+ symbolList[ i ].setLowerValue( lowerString )
|
|
76
|
+ symbolList[ i ].setUpperValue( upperString )
|
|
77
|
+ symbolList[ i ].setLabel( lowerString + " - " + upperString )
|
|
78
|
+
|
|
79
|
+ # Define a symbol object based on each class definition
|
|
80
|
+ for i in range( numberOfClasses ):
|
|
81
|
+ symbol = symbolList[ i ]
|
|
82
|
+ lower_bound = symbol.lowerValue()
|
|
83
|
+ upper_bound = symbol.upperValue()
|
|
84
|
+ label = symbol.label()
|
|
85
|
+
|
|
86
|
+ sy = QgsSymbol( layer.geometryType(), lower_bound, upper_bound, label )
|
|
87
|
+ sy.setFillColor( symbol.brush().color() )
|
|
88
|
+ sy.setFillStyle( symbol.brush().style() )
|
|
89
|
+
|
|
90
|
+ renderer.addSymbol( sy )
|
|
91
|
+
|
|
92
|
+ # Set the field index to classify and set the created renderer object to the layer
|
|
93
|
+ renderer.setClassificationField( fieldIndex )
|
|
94
|
+ layer.setRenderer( renderer )
|
|
95
|
+
|
|
96
|
+
|