QGIS » QGIS Application

#!/usr/bin/env python

# -*- coding: utf-8 -*-

from qgis import core

core.QgsApplication.setPrefixPath("/usr", True)

core.QgsApplication.initQgis()

import os

wd = './'

vlayer = core.QgsVectorLayer(wd + "/../data/regioni.shp", "regioni", "ogr")

vlayer.isValid()

core.QgsMapLayerRegistry.instance().addMapLayer(vlayer)

from PyQt4 import QtGui, QtCore

img = QtGui.QImage(QtCore.QSize(800,600), QtGui.QImage.Format_ARGB32_Premultiplied)

p = QtGui.QPainter()

p.begin(img)

p.setRenderHint(QtGui.QPainter.Antialiasing)

render = core.QgsMapRenderer()

lst = [ vlayer.getLayerID() ]

render.setLayerSet(lst)

rect = core.QgsRectangle(render.fullExtent())

rect.scale(1.1)

render.setExtent(rect)

render.setOutputSize(img.size(), img.logicalDpiX())

render.render(p)

p.end()

composition = core.QgsComposition(render)