Hi to all,
I'm trying to pass to the map composition a layer, setting the scale at 1:20.
with this method I'm creating a bbox around my geometry, then I
convert the measures (in meters) into 1:20 scale to obtain the
dimension of my page.
For example: for a bbox of 1x2 meters I want print a page 5 cm x 10 cm.
def converter_1_20(self, n):
n *= 100
res = n / 20
return res
def test_bbox(self):
self.layerUS.select( [] ) # recuperi tutte le geometrie senza
attributi
featPoly = QgsFeature() # crei una feature vuota per il poligono
dizionario_id_contains = {}
lista_quote = []
self.layerUS.nextFeature( featPoly ) # cicli sulle feature
recuperate, featPoly conterra la feature poligonale attuale
bbox = featPoly.geometry().boundingBox() # recupera i punti nel
bbox
del poligono
self.height = self.converter_1_20(float(bbox.height()))
self.width = self.converter_1_20(float(bbox.width()))
Then I try to pass this measures to map composition but I obtain a
different scale. I try to use the metod mapRenderer.setScale(1.20) but
this do nothing.
How can I pass to the printer system to obtain a 1:20 scale map?
Thanks a lot and best regards.
Luca
def print_map(self):
mapRenderer = self.iface.mapCanvas().mapRenderer()
mapRenderer.setScale(1.20)
mapRenderer.updateScale()
c = QgsComposition(mapRenderer)
c.setPlotStyle(QgsComposition.Print)
#map - this item tells the libraries where to put the map
itself.
Here we create a map and stretch it over the whole paper size:
x, y = 0,-4
w, h = c.paperWidth(), c.paperHeight()
composerMap = QgsComposerMap(c, x, y, w, h)
c.addItem(composerMap)
#scale bar
item = QgsComposerScaleBar(c)
item.setStyle('Numeric') # optionally modify the style
item.setComposerMap(composerMap)
item.applyDefaultSize()
c.addItem(item)
width = self.height*10
height = self.width*10
dpi = 300
....
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