"The explosive growth of the GeoWeb and geographic information has made GIS powerful media for the general public to communicate, but perhaps more importantly, GIS have also become media for constructive dialogs and interactions about social issues." - Sui & Goodchild
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geoinf15:qgsmaprenderer [2017/11/15 21:40] oertz [Etape 2] |
geoinf15:qgsmaprenderer [2017/11/22 23:15] oertz [Etape 2] |
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- | ====== QgsMapRenderer.py ====== | + | ====== Moteur de rendu cartographique QgsMapRenderer ====== |
===== Etape 1 ===== | ===== Etape 1 ===== | ||
* Lancer QGIS | * Lancer QGIS | ||
- | * Charger une quelconque couche de polygones (cantons de Suisse, etc) | + | * Charger la couche de polygones suivante {{:geoinf15:pk25_decoupage.zip|}} |
* Dans la console Python de QGIS, ouvrir l'éditeur | * Dans la console Python de QGIS, ouvrir l'éditeur | ||
* Y insérer le code ci-dessous | * Y insérer le code ci-dessous | ||
Line 13: | Line 13: | ||
from PyQt4.QtGui import * | from PyQt4.QtGui import * | ||
- | img = QImage(QSize(800,600), QImage.Format_ARGB32_Premultiplied) | + | aLayer = qgis.utils.iface.activeLayer() |
+ | |||
+ | img = QImage(QSize(800,600), QImage.Format_RGB32) | ||
img.fill(QColor(255,255,255).rgb()) | img.fill(QColor(255,255,255).rgb()) | ||
p = QPainter() | p = QPainter() | ||
+ | |||
p.begin(img) | p.begin(img) | ||
p.setRenderHint(QPainter.Antialiasing) | p.setRenderHint(QPainter.Antialiasing) | ||
render = QgsMapRenderer() | render = QgsMapRenderer() | ||
- | aLayer = qgis.utils.iface.activeLayer() | ||
render.setLayerSet([ aLayer.id() ]) | render.setLayerSet([ aLayer.id() ]) | ||
- | #aLayer.loadSldStyle('/tmp/test.sld') | ||
rect = QgsRectangle(render.fullExtent()) | rect = QgsRectangle(render.fullExtent()) | ||
render.setExtent(rect) | render.setExtent(rect) | ||
Line 27: | Line 28: | ||
render.render(p) | render.render(p) | ||
p.end() | p.end() | ||
+ | |||
img.save("/tmp/render.png","png") | img.save("/tmp/render.png","png") | ||
</code> | </code> | ||
+ | (compréhension du "portrayal model" {{:ogo13:portrayalogc.png?linkonly|}}) | ||
===== Etape 2 ===== | ===== Etape 2 ===== | ||
- | * Télécharger/décompresser la description de style ci-après {{:geoinf15:test.sld.zip|test.sld}} | + | * Créer un fichier singleSymbol.sld avec la description de style ci-dessous qui utilise un [[http://docs.geoserver.org/stable/en/user/styling/sld/reference/polygonsymbolizer.html|PolygonSymbolizer]]<code> |
- | * Décommenter la ligne //aLayer.loadSldStyle// et adapter le chemin selon votre système de fichier | + | |
- | * Sauvegarder le script | + | |
- | * Exécuter | + | |
- | + | ||
- | <code> | + | |
<?xml version="1.0" encoding="UTF-8"?> | <?xml version="1.0" encoding="UTF-8"?> | ||
<StyledLayerDescriptor version="1.1.0" | <StyledLayerDescriptor version="1.1.0" | ||
- | xmlns="http://www.opengis.net/sld" | + | xmlns="http://www.opengis.net/sld" |
- | xmlns:se="http://www.opengis.net/se" | + | xmlns:se="http://www.opengis.net/se" |
- | xmlns:ogc="http://www.opengis.net/ogc" | + | xmlns:ogc="http://www.opengis.net/ogc" |
- | xmlns:xlink="http://www.w3.org/1999/xlink" | + | xmlns:xlink="http://www.w3.org/1999/xlink" |
- | xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" | + | xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" |
- | xsi:schemaLocation="http://www.opengis.net/sld http://schemas.opengis.net/sld/1.1.0/StyledLayerDescriptor.xsd"> | + | xsi:schemaLocation="http://www.opengis.net/sld http://schemas.opengis.net/sld/1.1.0/StyledLayerDescriptor.xsd"> |
- | <NamedLayer> | + | <NamedLayer> |
- | <se:Name>CantonsCH_region</se:Name> | + | <se:Name>kartenblatt_region</se:Name> |
- | <UserStyle> | + | <UserStyle> |
- | <se:Name>CantonsCH_region</se:Name> | + | <se:Name>kartenblatt_region</se:Name> |
- | <se:FeatureTypeStyle> | + | <se:FeatureTypeStyle> |
- | <se:Rule> | + | <se:Rule> |
- | <se:Name>Single symbol</se:Name> | + | <se:Name>Single symbol</se:Name> |
- | <se:PolygonSymbolizer> | + | <se:PolygonSymbolizer> |
- | <se:Fill> | + | <se:Fill> |
- | <se:SvgParameter name="fill">#f1f4c7</se:SvgParameter> | + | <se:SvgParameter name="fill">#f1f4c7</se:SvgParameter> |
- | </se:Fill> | + | </se:Fill> |
- | <se:Stroke> | + | <se:Stroke> |
- | <se:SvgParameter name="stroke">#afb38a</se:SvgParameter> | + | <se:SvgParameter name="stroke">#afb38a</se:SvgParameter> |
- | <se:SvgParameter name="stroke-width">0.26</se:SvgParameter> | + | <se:SvgParameter name="stroke-width">0.26</se:SvgParameter> |
- | <se:SvgParameter name="stroke-linejoin">bevel</se:SvgParameter> | + | <se:SvgParameter name="stroke-linejoin">bevel</se:SvgParameter> |
- | </se:Stroke> | + | </se:Stroke> |
- | </se:PolygonSymbolizer> | + | </se:PolygonSymbolizer> |
- | </se:Rule> | + | </se:Rule> |
- | </se:FeatureTypeStyle> | + | </se:FeatureTypeStyle> |
- | </UserStyle> | + | </UserStyle> |
- | </NamedLayer> | + | </NamedLayer> |
</StyledLayerDescriptor> | </StyledLayerDescriptor> | ||
</code> | </code> | ||
+ | * Insérer au bon endroit l'instruction d'appel à la méthode loadSldStyle ci-après (en adaptant le chemin d'accès à votre fichier de style)<code> | ||
+ | aLayer.loadSldStyle('/path/to/singleSymbol.sld') | ||
+ | </code> | ||
+ | * Sauvegarder le script | ||
+ | * Exécuter et voyez le résultat | ||
+ | * Modifier la description de style pour distinguer les cartes combinées des cartes standards (utiliser une règle filtrée - [[http://docs.geoserver.org/stable/en/user/styling/sld/reference/rules.html|Rule]] [[http://docs.geoserver.org/stable/en/user/styling/sld/reference/filters.html#sld-reference-filters|Filter]]) | ||
+ | |||
+ | |||