def draw(self, renderContext):
extent = renderContext.extent()
if extent.isEmpty() or extent.width() == float("inf"):
qDebug("Drawing is skipped because map extent is empty or inf.")
return True
map2pixel = renderContext.mapToPixel()
mupp = map2pixel.mapUnitsPerPixel()
rotation = map2pixel.mapRotation()
painter = renderContext.painter()
viewport = painter.viewport()
isWebMercator = True
transform = renderContext.coordinateTransform()
if transform:
isWebMercator = transform.destCRS().postgisSrid() == 3857
# frame layer isn't drawn if the CRS is not web mercator or map is rotated
if self.layerDef.serviceUrl[0] == ":" and "frame" in self.layerDef.serviceUrl: # or "number" in self.layerDef.serviceUrl:
msg = ""
if not isWebMercator:
msg = self.tr("Frame layer is not drawn if the CRS is not EPSG:3857")
elif rotation:
msg = self.tr("Frame layer is not drawn if map is rotated")
if msg:
self.showMessageBar(msg, QgsMessageBar.INFO, 2)
return True
if not isWebMercator:
# get extent in project CRS
cx, cy = 0.5 * viewport.width(), 0.5 * viewport.height()
center = map2pixel.toMapCoordinatesF(cx, cy)
mapExtent = RotatedRect(center, mupp * viewport.width(), mupp * viewport.height(), rotation)
if transform:
transform = QgsCoordinateTransform(transform.destCRS(), transform.sourceCrs())
geometry = QgsGeometry.fromPolyline([map2pixel.toMapCoordinatesF(cx - 0.5, cy), map2pixel.toMapCoordinatesF(cx + 0.5, cy)])
geometry.transform(transform)
mupp = geometry.length()
# get bounding box of the extent in EPSG:3857
geometry = mapExtent.geometry()
geometry.transform(transform)
extent = geometry.boundingBox()
else:
qDebug("Drawing is skipped because CRS transformation is not ready.")
return True
elif rotation:
# get bounding box of the extent
mapExtent = RotatedRect(extent.center(), mupp * viewport.width(), mupp * viewport.height(), rotation)
extent = mapExtent.boundingBox()
# calculate zoom level
tile_mpp1 = self.layerDef.TSIZE1 / self.layerDef.TILE_SIZE
zoom = int(math.ceil(math.log(tile_mpp1 / mupp, 2) + 1))
zoom = max(0, min(zoom, self.layerDef.zmax))
#zoom = max(self.layerDef.zmin, zoom)
# zoom limit
if zoom < self.layerDef.zmin:
if self.plugin.navigationMessagesEnabled:
msg = self.tr("Current zoom level ({0}) is smaller than zmin ({1}): {2}").format(zoom, self.layerDef.zmin, self.layerDef.title)
self.showMessageBar(msg, QgsMessageBar.INFO, 2)
return True
while True:
# calculate tile range (yOrigin is top)
size = self.layerDef.TSIZE1 / 2 ** (zoom - 1)
matrixSize = 2 ** zoom
ulx = max(0, int((extent.xMinimum() + self.layerDef.TSIZE1) / size))
uly = max(0, int((self.layerDef.TSIZE1 - extent.yMaximum()) / size))
lrx = min(int((extent.xMaximum() + self.layerDef.TSIZE1) / size), matrixSize - 1)
lry = min(int((self.layerDef.TSIZE1 - extent.yMinimum()) / size), matrixSize - 1)
# bounding box limit
if self.layerDef.bbox:
trange = self.layerDef.bboxDegreesToTileRange(zoom, self.layerDef.bbox)
ulx = max(ulx, trange.xmin)
uly = max(uly, trange.ymin)
lrx = min(lrx, trange.xmax)
lry = min(lry, trange.ymax)
if lrx < ulx or lry < uly:
# tile range is out of the bounding box
return True
# tile count limit
tileCount = (lrx - ulx + 1) * (lry - uly + 1)
if tileCount > self.MAX_TILE_COUNT:
# as tile count is over the limit, decrease zoom level
zoom -= 1
# if the zoom level is less than the minimum, do not draw
if zoom < self.layerDef.zmin:
msg = self.tr("Tile count is over limit ({0}, max={1})").format(tileCount, self.MAX_TILE_COUNT)
self.showMessageBar(msg, QgsMessageBar.WARNING, 4)
return True
continue
# zoom level has been determined
break
self.logT("TileLayer.draw: {0} {1} {2} {3} {4}".format(zoom, ulx, uly, lrx, lry))
# save painter state
painter.save()
# set pen and font
painter.setPen(Qt.black)
font = QFont(painter.font())
font.setPointSize(10)
painter.setFont(font)
if self.layerDef.serviceUrl[0] == ":":
painter.setBrush(QBrush(Qt.NoBrush))
self.drawDebugInfo(renderContext, zoom, ulx, uly, lrx, lry)
else:
# create a Tiles object and a list of urls to fetch tile image data
tiles = Tiles(zoom, ulx, uly, lrx, lry, self.layerDef)
urls = []
cachedTiles = self.tiles
cacheHits = 0
for ty in range(uly, lry + 1):
for tx in range(ulx, lrx + 1):
data = None
url = self.layerDef.tileUrl(zoom, tx, ty)
if cachedTiles and zoom == cachedTiles.zoom and url in cachedTiles.tiles:
data = cachedTiles.tiles[url].data
tiles.addTile(url, Tile(zoom, tx, ty, data))
if data is None:
urls.append(url)
elif data: # memory cache exists
cacheHits += 1
# else: # tile not found
self.tiles = tiles
if len(urls) > 0:
# fetch tile data
files = self.fetchFiles(urls, renderContext)
for url, data in files.items():
tiles.setImageData(url, data)
if self.iface:
stats = self.downloader.stats()
allCacheHits = cacheHits + stats["cacheHits"]
msg = self.tr("{0} files downloaded. {1} caches hit.").format(stats["downloaded"], allCacheHits)
barmsg = None
if self.downloader.errorStatus != Downloader.NO_ERROR:
if self.downloader.errorStatus == Downloader.TIMEOUT_ERROR:
barmsg = self.tr("Download Timeout - {0}").format(self.name())
elif stats["errors"] > 0:
msg += self.tr(" {0} files failed.").format(stats["errors"])
if stats["successed"] + allCacheHits == 0:
barmsg = self.tr("Failed to download all {0} files. - {1}").format(stats["errors"], self.name())
self.showStatusMessage(msg, 5000)
if barmsg:
self.showMessageBar(barmsg, QgsMessageBar.WARNING, 4)
# apply layer style
oldOpacity = painter.opacity()
painter.setOpacity(0.01 * (100 - self.transparency))
oldSmoothRenderHint = painter.testRenderHint(QPainter.SmoothPixmapTransform)
if self.smoothRender:
painter.setRenderHint(QPainter.SmoothPixmapTransform)
# do not start drawing tiles if rendering has been stopped
if renderContext.renderingStopped():
self.log("draw(): renderingStopped!")
painter.restore()
return True
# draw tiles
if isWebMercator and rotation == 0:
self.drawTiles(renderContext, tiles)
# self.drawTilesDirectly(renderContext, tiles)
else:
# reproject tiles
self.drawTilesOnTheFly(renderContext, mapExtent, tiles)
# restore old state
painter.setOpacity(oldOpacity)
if self.smoothRender:
painter.setRenderHint(QPainter.SmoothPixmapTransform, oldSmoothRenderHint)
# draw credit on the bottom right corner
if self.creditVisibility and self.layerDef.attribution:
margin, paddingH, paddingV = (3, 4, 3)
# scale
scaleX, scaleY = self.getScaleToVisibleExtent(renderContext)
scale = max(scaleX, scaleY)
painter.scale(scale, scale)
visibleSWidth = painter.viewport().width() * scaleX / scale
visibleSHeight = painter.viewport().height() * scaleY / scale
rect = QRect(0, 0, visibleSWidth - margin, visibleSHeight - margin)
textRect = painter.boundingRect(rect, Qt.AlignBottom | Qt.AlignRight, self.layerDef.attribution)
bgRect = QRect(textRect.left() - paddingH, textRect.top() - paddingV, textRect.width() + 2 * paddingH, textRect.height() + 2 * paddingV)
painter.fillRect(bgRect, QColor(240, 240, 240, 150))
painter.drawText(rect, Qt.AlignBottom | Qt.AlignRight, self.layerDef.attribution)
# restore painter state
painter.restore()
return True
