Re: [Qgis-user] Convert symbology of qgis layer into PyQGIS code to define renderer
Olá Manuel,
First save the style (using the GUI or using PyQGIS) as a qml file.
To apply the style to another layer (use the Python console to test the
code):
1) Select the other layer you want to apply the style
2) Run the PyQGIS code:
l = iface.activeLayer()
l.loadNamedStyle('/home/manuel/awesome.qml')
l.triggerRepaint()
Good luck!
Gustavo
On 11/06/21 14:58, Manuel Campagnolo wrote:
> Olá Gustavo
>
> How do I apply the named style afterwards in PyQGIS from the style qml
> file as the example below?
>
> Thanks again
>
> Manuel
>
> http://mrcc.com/qgis.dtd' 'SYSTEM'>
> simplifyDrawingTol="1" simplifyDrawingHints="1" simplifyAlgorithm="0"
> version="3.18.1-Zürich" readOnly="0" hasScaleBasedVisibilityFlag="0"
> minScale="1" maxScale="0" styleCategories="AllStyleCategories">
>
> 1
> 1
> 1
> 0
>
> fixedDuration="0" startField="" mode="0" durationField=""
> accumulate="0" endField="" endExpression="">
>
>
>
>
>
> symbollevels="0" type="categorizedSymbol">
>
>
>
>
>
> type="fill">
>
>
>
>
>
>
>
>
>
> name="border_width_map_unit_scale" type="QString"/>
>
>
>
> name="offset_map_unit_scale" type="QString"/>
>
>
> [...]
>
>
> On 11/06/2021 14:41, Jorge Gustavo Rocha wrote:
>> Olá Manuel,
>>
>> There is no way to get the PyQGIS code from the style, as far as I know.
>>
>> But you can save the style (using the native QGIS format) and apply the
>> named style afterwards in PyQGIS easily. Is this alternative workflow
>> suitable for you?
>>
>> Regards,
>>
>> Gustavo
>>
>> On 11/06/21 12:56, Manuel Campagnolo wrote:
>>> Hi
>>>
>>> Do you know of a way of using the style of a ,say, vector layer in
>>> QGIS3 to create automatically the python code that would generate it,
>>> namely the QgsSymbol part in the code below.
>>>
>>> Thanks
>>>
>>>
>>> symbol1=QgsSymbol.defaultSymbol(ifn_ppsm.geometryType())
>>> symbol2=QgsSymbol.defaultSymbol(ifn_ppsm.geometryType())
>>> symbol3=QgsSymbol.defaultSymbol(ifn_ppsm.geometryType())
>>> symbol4=QgsSymbol.defaultSymbol(ifn_ppsm.geometryType())
>>> symbol5=QgsSymbol.defaultSymbol(ifn_ppsm.geometryType())
>>>
>>> symbol1.setColor(QColor('black'))
>>> symbol2.setColor(QColor('gray'))
>>> symbol3.setColor(QColor('dark green'))
>>> symbol4.setColor(QColor('light green'))
>>> symbol5.setColor(QColor('orange'))
>>>
>>> cat1=QgsRendererCategory('Improdutivos', symbol1, 'Improdutivos') #
>>> category, symbol, label
>>> cat2=QgsRendererCategory('Urbano', symbol2, 'Urbano')
>>> cat3=QgsRendererCategory('Matos e Pastagens', symbol3, 'Matos e
>>> Pastagens')
>>> cat4=QgsRendererCategory('Floresta', symbol4, 'Floresta')
>>> cat5=QgsRendererCategory('Agricultura', symbol5, 'Agricultura')
>>> categories=[cat1,cat2,cat3,cat4,cat5] # list
>>>
>>> renderer = QgsCategorizedSymbolRenderer('usosolo', categories)
>>> ifn_ppsm.setRenderer(renderer)
>>>
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Re: [Qgis-user] Convert symbology of qgis layer into PyQGIS code to define renderer
Hi,
As far as I know symbology is tight to the topology.
Here is a simple example for lines.
mlayer = qgis.utils.iface.activeLayer()
styles = {'width': '0.5', 'color': 'yellow', 'penstyle': 'solid'}
registry = qgis.core.QgsSymbolLayerV2Registry.instance()
symbol = qgis.core.QgsSymbolV2.defaultSymbol(mlayer.geometryType())
lineLayer = lineMeta.createSymbolLayer(styles)
symbol.deleteSymbolLayer(0)
symbol.appendSymbolLayer(lineLayer)
renderer = qgis.core.QgsSingleSymbolRendererV2(symbol)
mlayer.setRendererV2(renderer)
mlayer.triggerRepaint()
qgis.utils.iface.mapCanvas().refresh()
For points
styles = {'name': 'diamond', 'color': 'yellow', 'size': '2'}
pointSymbol = qgis.core.QgsMarkerSymbolV2.createSimple(styles)
mlayer.rendererV2().setSymbol(pointSymbol)
qgis.utils.iface.mapCanvas().refresh()
mlayer.triggerRepaint()
for polygons
symbol.setColor(QtGui.QColor("blue"))
registry = QgsSymbolLayerV2Registry.instance()
lineMeta = registry.symbolLayerMetadata("SimpleLine")
lineLayer = lineMeta.createSymbolLayer({'width': '0.8',
'color': 'blue', 'offset': '0', 'penstyle': 'solid'})
symbol.appendSymbolLayer(lineLayer)
symbol.setAlpha(0.2)
renderer = QgsRuleBasedRendererV2(symbol)
vLayer.setRendererV2(renderer)
vLayer.setLayerTransparency(0)
vLayer.triggerRepaint()
This when you want to have static symbols.
QGIS also gives the capability of creating dynamic symbols
-Original Message-
From: Qgis-user On Behalf Of Manuel
Campagnolo
Sent: June 11, 2021 7:56 AM
To: qgis-user@lists.osgeo.org
Subject: [EXT] [Qgis-user] Convert symbology of qgis layer into PyQGIS code to
define renderer
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Hi
Do you know of a way of using the style of a ,say, vector layer in QGIS3 to
create automatically the python code that would generate it, namely the
QgsSymbol part in the code below.
Thanks
symbol1=QgsSymbol.defaultSymbol(ifn_ppsm.geometryType())
symbol2=QgsSymbol.defaultSymbol(ifn_ppsm.geometryType())
symbol3=QgsSymbol.defaultSymbol(ifn_ppsm.geometryType())
symbol4=QgsSymbol.defaultSymbol(ifn_ppsm.geometryType())
symbol5=QgsSymbol.defaultSymbol(ifn_ppsm.geometryType())
symbol1.setColor(QColor('black'))
symbol2.setColor(QColor('gray'))
symbol3.setColor(QColor('dark green'))
symbol4.setColor(QColor('light green'))
symbol5.setColor(QColor('orange'))
cat1=QgsRendererCategory('Improdutivos', symbol1, 'Improdutivos') # category,
symbol, label cat2=QgsRendererCategory('Urbano', symbol2, 'Urbano')
cat3=QgsRendererCategory('Matos e Pastagens', symbol3, 'Matos e Pastagens')
cat4=QgsRendererCategory('Floresta', symbol4, 'Floresta')
cat5=QgsRendererCategory('Agricultura', symbol5, 'Agricultura')
categories=[cat1,cat2,cat3,cat4,cat5] # list
renderer = QgsCategorizedSymbolRenderer('usosolo', categories)
ifn_ppsm.setRenderer(renderer)
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Re: [Qgis-user] Convert symbology of qgis layer into PyQGIS code to define renderer
Olá Gustavo
How do I apply the named style afterwards in PyQGIS from the style qml
file as the example below?
Thanks again
Manuel
http://mrcc.com/qgis.dtd' 'SYSTEM'>
simplifyDrawingTol="1" simplifyDrawingHints="1" simplifyAlgorithm="0"
version="3.18.1-Zürich" readOnly="0" hasScaleBasedVisibilityFlag="0"
minScale="1" maxScale="0" styleCategories="AllStyleCategories">
1
1
1
0
fixedDuration="0" startField="" mode="0" durationField="" accumulate="0"
endField="" endExpression="">
symbollevels="0" type="categorizedSymbol">
type="fill">
name="border_width_map_unit_scale" type="QString"/>
type="QString"/>
[...]
On 11/06/2021 14:41, Jorge Gustavo Rocha wrote:
Olá Manuel,
There is no way to get the PyQGIS code from the style, as far as I know.
But you can save the style (using the native QGIS format) and apply the
named style afterwards in PyQGIS easily. Is this alternative workflow
suitable for you?
Regards,
Gustavo
On 11/06/21 12:56, Manuel Campagnolo wrote:
Hi
Do you know of a way of using the style of a ,say, vector layer in
QGIS3 to create automatically the python code that would generate it,
namely the QgsSymbol part in the code below.
Thanks
symbol1=QgsSymbol.defaultSymbol(ifn_ppsm.geometryType())
symbol2=QgsSymbol.defaultSymbol(ifn_ppsm.geometryType())
symbol3=QgsSymbol.defaultSymbol(ifn_ppsm.geometryType())
symbol4=QgsSymbol.defaultSymbol(ifn_ppsm.geometryType())
symbol5=QgsSymbol.defaultSymbol(ifn_ppsm.geometryType())
symbol1.setColor(QColor('black'))
symbol2.setColor(QColor('gray'))
symbol3.setColor(QColor('dark green'))
symbol4.setColor(QColor('light green'))
symbol5.setColor(QColor('orange'))
cat1=QgsRendererCategory('Improdutivos', symbol1, 'Improdutivos') #
category, symbol, label
cat2=QgsRendererCategory('Urbano', symbol2, 'Urbano')
cat3=QgsRendererCategory('Matos e Pastagens', symbol3, 'Matos e
Pastagens')
cat4=QgsRendererCategory('Floresta', symbol4, 'Floresta')
cat5=QgsRendererCategory('Agricultura', symbol5, 'Agricultura')
categories=[cat1,cat2,cat3,cat4,cat5] # list
renderer = QgsCategorizedSymbolRenderer('usosolo', categories)
ifn_ppsm.setRenderer(renderer)
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--
-
Manuel Campagnolo
https://www.isa.ulisboa.pt/id/mlc
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Re: [Qgis-user] Convert symbology of qgis layer into PyQGIS code to define renderer
Olá Manuel,
There is no way to get the PyQGIS code from the style, as far as I know.
But you can save the style (using the native QGIS format) and apply the
named style afterwards in PyQGIS easily. Is this alternative workflow
suitable for you?
Regards,
Gustavo
On 11/06/21 12:56, Manuel Campagnolo wrote:
> Hi
>
> Do you know of a way of using the style of a ,say, vector layer in
> QGIS3 to create automatically the python code that would generate it,
> namely the QgsSymbol part in the code below.
>
> Thanks
>
>
> symbol1=QgsSymbol.defaultSymbol(ifn_ppsm.geometryType())
> symbol2=QgsSymbol.defaultSymbol(ifn_ppsm.geometryType())
> symbol3=QgsSymbol.defaultSymbol(ifn_ppsm.geometryType())
> symbol4=QgsSymbol.defaultSymbol(ifn_ppsm.geometryType())
> symbol5=QgsSymbol.defaultSymbol(ifn_ppsm.geometryType())
>
> symbol1.setColor(QColor('black'))
> symbol2.setColor(QColor('gray'))
> symbol3.setColor(QColor('dark green'))
> symbol4.setColor(QColor('light green'))
> symbol5.setColor(QColor('orange'))
>
> cat1=QgsRendererCategory('Improdutivos', symbol1, 'Improdutivos') #
> category, symbol, label
> cat2=QgsRendererCategory('Urbano', symbol2, 'Urbano')
> cat3=QgsRendererCategory('Matos e Pastagens', symbol3, 'Matos e
> Pastagens')
> cat4=QgsRendererCategory('Floresta', symbol4, 'Floresta')
> cat5=QgsRendererCategory('Agricultura', symbol5, 'Agricultura')
> categories=[cat1,cat2,cat3,cat4,cat5] # list
>
> renderer = QgsCategorizedSymbolRenderer('usosolo', categories)
> ifn_ppsm.setRenderer(renderer)
>
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