def drawTilesOnTheFly(self, renderContext, tiles, sdx=1.0, sdy=1.0):
if not hasGdal:
msg = self.tr("Reprojection requires python-gdal")
self.showBarMessage(msg, QgsMessageBar.INFO, 2)
return
transform = renderContext.coordinateTransform()
if not transform:
return
# create an image that has the same resolution as the tiles
image = tiles.image()
if self.grayscaleRender:
QgsImageOperation.convertToGrayscale(image)
if self.brigthness != LayerDefaultSettings.BRIGTNESS or self.contrast != LayerDefaultSettings.CONTRAST:
QgsImageOperation.adjustBrightnessContrast(image, self.brigthness, self.contrast)
# tile extent
extent = tiles.extent()
geotransform = [extent.xMinimum(), extent.width() / image.width(), 0, extent.yMaximum(), 0,
-extent.height() / image.height()]
driver = gdal.GetDriverByName("MEM")
tile_ds = driver.Create("", image.width(), image.height(), 1, gdal.GDT_UInt32)
tile_ds.SetProjection(str(transform.sourceCrs().toWkt()))
tile_ds.SetGeoTransform(geotransform)
# QImage to raster
ba = image.bits().asstring(image.numBytes())
tile_ds.GetRasterBand(1).WriteRaster(0, 0, image.width(), image.height(), ba)
# canvas extent
m2p = renderContext.mapToPixel()
viewport = renderContext.painter().viewport()
width = viewport.width()
height = viewport.height()
extent = QgsRectangle(m2p.toMapCoordinatesF(0, 0), m2p.toMapCoordinatesF(width, height))
geotransform = [extent.xMinimum(), extent.width() / width, 0, extent.yMaximum(), 0, -extent.height() / height]
canvas_ds = driver.Create("", width, height, 1, gdal.GDT_UInt32)
canvas_ds.SetProjection(str(transform.destCRS().toWkt()))
canvas_ds.SetGeoTransform(geotransform)
# reproject image
gdal.ReprojectImage(tile_ds, canvas_ds)
# raster to QImage
ba = canvas_ds.GetRasterBand(1).ReadRaster(0, 0, width, height)
reprojected_image = QImage(ba, width, height, QImage.Format_ARGB32_Premultiplied)
# draw the image on the map canvas
rect = QRectF(QPointF(0, 0), QPointF(viewport.width() * sdx, viewport.height() * sdy))
renderContext.painter().drawImage(rect, reprojected_image)
def drawTiles(self, renderContext, tiles, sdx=1.0, sdy=1.0):
# create an image that has the same resolution as the tiles
image = tiles.image()
if self.grayscaleRender:
QgsImageOperation.convertToGrayscale(image)
if self.brigthness != LayerDefaultSettings.BRIGTNESS or self.contrast != LayerDefaultSettings.CONTRAST:
QgsImageOperation.adjustBrightnessContrast(image, self.brigthness, self.contrast)
# tile extent to pixel
map2pixel = renderContext.mapToPixel()
extent = tiles.extent()
topLeft = map2pixel.transform(extent.xMinimum(), extent.yMaximum())
bottomRight = map2pixel.transform(extent.xMaximum(), extent.yMinimum())
rect = QRectF(QPointF(topLeft.x() * sdx, topLeft.y() * sdy),
QPointF(bottomRight.x() * sdx, bottomRight.y() * sdy))
# draw the image on the map canvas
renderContext.painter().drawImage(rect, image)
self.log("Tiles extent: " + str(extent))
self.log("Draw into canvas rect: " + str(rect))
def drawTiles(self, renderContext, tiles, sdx=1.0, sdy=1.0):
# create an image that has the same resolution as the tiles
image = tiles.image()
if self.grayscaleRender:
QgsImageOperation.convertToGrayscale(image)
if self.brigthness != LayerDefaultSettings.BRIGTNESS or self.contrast != LayerDefaultSettings.CONTRAST:
QgsImageOperation.adjustBrightnessContrast(image, self.brigthness,
self.contrast)
# tile extent to pixel
map2pixel = renderContext.mapToPixel()
extent = tiles.extent()
topLeft = map2pixel.transform(extent.xMinimum(), extent.yMaximum())
bottomRight = map2pixel.transform(extent.xMaximum(), extent.yMinimum())
rect = QRectF(QPointF(topLeft.x() * sdx,
topLeft.y() * sdy),
QPointF(bottomRight.x() * sdx,
bottomRight.y() * sdy))
# draw the image on the map canvas
renderContext.painter().drawImage(rect, image)
self.log("Tiles extent: " + str(extent))
self.log("Draw into canvas rect: " + str(rect))
def drawTilesOnTheFly(self, renderContext, tiles, sdx=1.0, sdy=1.0):
if not hasGdal:
msg = self.tr("Reprojection requires python-gdal")
self.emitShowBarMessage(msg, QGisMessageBarLevel.Info, 2)
return
transform = renderContext.coordinateTransform()
if not transform:
return
# create an image that has the same resolution as the tiles
image = tiles.image()
if self.grayscaleRender:
QgsImageOperation.convertToGrayscale(image)
if self.brigthness != LayerDefaultSettings.BRIGTNESS or self.contrast != LayerDefaultSettings.CONTRAST:
QgsImageOperation.adjustBrightnessContrast(image, self.brigthness,
self.contrast)
# tile extent
extent = tiles.extent()
geotransform = [
extent.xMinimum(),
extent.width() / image.width(), 0,
extent.yMaximum(), 0, -extent.height() / image.height()
]
driver = gdal.GetDriverByName("MEM")
tile_ds = driver.Create("", image.width(), image.height(), 1,
gdal.GDT_UInt32)
tile_ds.SetProjection(str(transform.sourceCrs().toWkt()))
tile_ds.SetGeoTransform(geotransform)
# QImage to raster
ba = image.bits().asstring(image.numBytes())
tile_ds.GetRasterBand(1).WriteRaster(0, 0, image.width(),
image.height(), ba)
# canvas extent
m2p = renderContext.mapToPixel()
viewport = renderContext.painter().viewport()
width = viewport.width()
height = viewport.height()
extent = QgsRectangle(m2p.toMapCoordinatesF(0, 0),
m2p.toMapCoordinatesF(width, height))
geotransform = [
extent.xMinimum(),
extent.width() / width, 0,
extent.yMaximum(), 0, -extent.height() / height
]
canvas_ds = driver.Create("", width, height, 1, gdal.GDT_UInt32)
canvas_ds.SetProjection(str(transform.destCRS().toWkt()))
canvas_ds.SetGeoTransform(geotransform)
# reproject image
gdal.ReprojectImage(tile_ds, canvas_ds)
# raster to QImage
ba = canvas_ds.GetRasterBand(1).ReadRaster(0, 0, width, height)
reprojected_image = QImage(ba, width, height,
QImage.Format_ARGB32_Premultiplied)
# draw the image on the map canvas
rect = QRectF(QPointF(0, 0),
QPointF(viewport.width() * sdx,
viewport.height() * sdy))
renderContext.painter().drawImage(rect, reprojected_image)