with open("metadatified.pdf", "wb") as f: writer.write(f) Here are three typical contracts that require a deep understanding of the PyQGIS 3 PDF workflow: 1. Batch PDF Generation from a Template Scenario: A city planning department has 50 district maps. Each PDF must show the same legend, title block, and scale bar, but with a different map extent and a district-specific label.
If you have been searching for the definitive "PyQGIS Programmer’s Guide 3 PDF work" , you are likely looking for one of two things: either a downloadable PDF reference for mastering PyQGIS 3, or a workflow to programmatically generate, manipulate, or export PDF documents using the QGIS 3 API.
Introduction Quantum GIS (QGIS) has evolved from a simple open-source desktop application into a full-fledged geospatial ecosystem. At its heart lies PyQGIS —the Python binding that allows you to automate, extend, and customize every aspect of the software. For developers and GIS analysts, the transition from QGIS 2.x to 3.x brought a seismic shift in API design, performance, and capability. pyqgis programmer 39s guide 3 pdf work
# Assuming layout has a coverage layer set layout = project.layoutManager().layoutByName("AtlasLayout") exporter = QgsLayoutExporter(layout) atlas_layout = layout.atlas() atlas_layout.setEnabled(True) atlas_layout.setCoverageLayer(atlas_layer) # polygon grid, e.g., 100 map sheets Export each feature as a separate PDF page or file for i in range(atlas_layout.count()): atlas_layout.setCurrentFeature(i) # Option 1: Single multi-page PDF exporter.exportToPdf(f"C:/GIS/atlas_page_i.pdf", QgsLayoutExporter.PdfExportSettings()) Merging PDFs with PyQGIS QGIS itself does not merge PDFs, but your PyQGIS script can leverage Python’s PyPDF2 or pypdf library after export:
Use a master .qgz with a layout containing one map item. Then: with open("metadatified
PyQGIS cannot create hyperlinks natively in PDF export. Instead, export each page separately, then use reportlab or pypdf to add clickable links based on page coordinates extracted from the layout. 3. Automated Print Composer for Sensor Data Scenario: A Python script runs nightly, pulls new raster data from a PostGIS database, updates a QGIS project, and emails a PDF report.
writer.add_metadata(metadata)
from pypdf import PdfMerger merger = PdfMerger() for i in range(10): merger.append(f"C:/GIS/atlas_page_i.pdf") merger.write("C:/GIS/final_mapbook.pdf") merger.close() Modern PDF workflows require embedded metadata (author, title, keywords). While QgsLayoutExporter does not directly set PDF metadata, you can post-process the PDF: