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Added transparency to areas with no vector data.

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Originally the background colour defaulted to white with no transparency for areas without vector data. I have added an alpha channel to the geotiff and set it zero (full transparency) for areas with no vector data. This could be optional, in case the user wants a solid background.
This commit is contained in:
Trashmonk 2017-12-20 16:51:30 +00:00 committed by Matthias Kuhn
parent 9fe87297e7
commit 4fbea38439
1 changed files with 7 additions and 2 deletions
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9
python/plugins/processing/algs/qgis/Rasterize.py
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@ -21,7 +21,7 @@
from processing.algs.qgis.QgisAlgorithm import QgisAlgorithm
from qgis.PyQt.QtGui import QImage, QPainter
from qgis.PyQt.QtGui import QImage, QPainter, QColor
from qgis.PyQt.QtCore import QSize
from qgis.core import (
QgsMapSettings,
@ -228,7 +228,7 @@ class TileSet():
xsize = self.x_tile_count * tile_size
ysize = self.y_tile_count * tile_size
self.dataset = driver.Create(output, xsize, ysize, 3) # 3 bands
self.dataset = driver.Create(output, xsize, ysize, 4) # 4 bands
self.dataset.SetProjection(str(crs.toWkt()))
self.dataset.SetGeoTransform(
[extent.xMinimum(), mupp, 0, extent.yMaximum(), 0, -mupp])
@ -240,6 +240,7 @@ class TileSet():
self.settings.setOutputImageFormat(QImage.Format_ARGB32)
self.settings.setDestinationCrs(crs)
self.settings.setOutputSize(self.image.size())
self.settings.setBackgroundColor(QColor(255,255,255,0))
self.settings.setFlag(QgsMapSettings.Antialiasing, True)
self.settings.setFlag(QgsMapSettings.RenderMapTile, True)
@ -277,6 +278,10 @@ class TileSet():
:param x: The x index of the current tile
:param y: The y index of the current tile
"""
background_colour = QColor(255,255,255,0)
self.image.fill(background_colour.rgba())
painter = QPainter(self.image)
self.settings.setExtent(QgsRectangle(