I have a print composer template which I'm trying to populate with different subset queries from a CSV-derived vector layer using the Python API. However, all the output PDFs contain everything except the layers on the map! I'm doing this with a standalone app, and it functions fine in that it does produce PDFs and the data is all loaded and interrogated just fine (I can subset query, count features etc.)
Here's the method I'm using to render the composition, as you can see I've tried to set the layers on the map in different places (actually there are 2 maps - one shows the extent rectangle of the other, but I can't get either to show anything) - this is my first QGIS scripting experience so I'm sure I'm missing something very obvious...
def compose(layers, species_binomial): # vlayer is the CSV vector layer, outline is the ADM0 country vector. vlayer, outline = layers # construct a QStringList for the renderer setLayerSet layers = QStringList(vlayer.id()) layers.append(outline.id()) # 1 maybe set the registry layers??? QgsMapLayerRegistry.instance().addMapLayer(vlayer) QgsMapLayerRegistry.instance().addMapLayer(outline) # 2 maybe set the canvas layer??? canvas = QgsMapCanvas() canvas.setExtent(outline.extent()) canvas.setLayerSet([QgsMapCanvasLayer(outline), QgsMapCanvasLayer(vlayer)]) # 3 set the renderer layers??? renderer = canvas.mapRenderer() renderer.setLayerSet(layers) renderer.setExtent(outline.extent()) composition = QgsComposition(renderer) with open(os.path.join(ROOT, 'species_composer.qpt'), 'rt') as fp: composer_template = fp.read() doc = QDomDocument() doc.setContent(composer_template) composition.loadFromTemplate(doc) # 4 maybe set the map layers of one of the maps??? map1 = composition.composerMapItems()[1] map1.setLayerSet(layers) title = composition.getComposerItemById('title') title.setText(" ".join(species_binomial)) # this works fiiiine out_path = os.path.join(ROOT, 'out', "%s_%s.pdf" % species_binomial) # make a lovely blank PDF with a title and a blue map rect ...What am I doing wrong? Here's an example output...
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Here's the method I'm using to render the composition, as you can see I've tried to set the layers on the map in different places (actually there are 2 maps - one shows the extent rectangle of the other, but I can't get either to show anything) - this is my first QGIS scripting experience so I'm sure I'm missing something very obvious...
def compose(layers, species_binomial): # vlayer is the CSV vector layer, outline is the ADM0 country vector. vlayer, outline = layers # construct a QStringList for the renderer setLayerSet layers = QStringList(vlayer.id()) layers.append(outline.id()) # 1 maybe set the registry layers??? QgsMapLayerRegistry.instance().addMapLayer(vlayer) QgsMapLayerRegistry.instance().addMapLayer(outline) # 2 maybe set the canvas layer??? canvas = QgsMapCanvas() canvas.setExtent(outline.extent()) canvas.setLayerSet([QgsMapCanvasLayer(outline), QgsMapCanvasLayer(vlayer)]) # 3 set the renderer layers??? renderer = canvas.mapRenderer() renderer.setLayerSet(layers) renderer.setExtent(outline.extent()) composition = QgsComposition(renderer) with open(os.path.join(ROOT, 'species_composer.qpt'), 'rt') as fp: composer_template = fp.read() doc = QDomDocument() doc.setContent(composer_template) composition.loadFromTemplate(doc) # 4 maybe set the map layers of one of the maps??? map1 = composition.composerMapItems()[1] map1.setLayerSet(layers) title = composition.getComposerItemById('title') title.setText(" ".join(species_binomial)) # this works fiiiine out_path = os.path.join(ROOT, 'out', "%s_%s.pdf" % species_binomial) # make a lovely blank PDF with a title and a blue map rect ...What am I doing wrong? Here's an example output...
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