0

I would like the background of my label and scale bar items to be white rather than transparent.

enter image description here

I am using Python in QGIS. My code is below. See the # Add Scalebar and # Add Title sections towards the end. Note that this code is within a loop because I will be generating and exporting a series of maps with the same layout. I generate the render colors in code outside the loop but don't include it here because the code is already long.

I tried this based on another post but it didn't work for me.

    scalebar = super(QgsLayoutItem, scalebar)
    scalebar.setBrush(QColor(255,255,255))
for i in range(0,len(targ)):
    
    # Load Raster File
    fn = "/".join([fldr, targ[i]])
    fi = QFileInfo(fn)
    fname = fi.baseName()
    rlayer = iface.addRasterLayer(fn, fname)
    
    renderer = QgsSingleBandPseudoColorRenderer(rlayer.dataProvider(), 1, shader)
    rlayer.setRenderer(renderer)
    
    # Create and Export Print Layout
    # Identify Layer for Map
    layers = QgsProject.instance().mapLayersByName(fname)
    layer = layers[0]
    project = QgsProject.instance()
    manager = project.layoutManager()
    layoutName = " ".join(['Temp Pred Maps', str(i)])
    layouts_list = manager.printLayouts()
    
    # Remove any duplicate layouts
    for i in layouts_list:
        if i.name() == layoutName:
            manager.removeLayout(i)
    
    # Add add layout to QGIS
    layout = QgsPrintLayout(project)
    layout.initializeDefaults()
    layout.setName(layoutName)
    manager.addLayout(layout)
    
    # SET PAGE SIZE HERE
    #*** HOW TO SET PAGE SIZE? ***
    page = QgsLayoutItemPage(layout)
    page_size = QgsLayoutSize(200, 200, QgsUnitTypes.LayoutMillimeters)
    #page.QgsPageSize(page_size.size) # Error
    page.attemptResize(page_size) # Does Nothing???
    #layout.addLayoutItem(page) # Adds second page
    #layout.removeLayoutItem(layout)
    
    # Create map item in the layout
    map = QgsLayoutItemMap(layout)
    map.setRect(20,20,20,20)
    
    # set the map extent
    ms = QgsMapSettings()
    ms.setLayers([layer]) # set layers to be mapped
    rect = QgsRectangle(can_ext)
    rect.scale(1)
    ms.setExtent(rect)
    map.setExtent(rect)
    layout.addLayoutItem(map)
    map.attemptMove(QgsLayoutPoint(0, 0, QgsUnitTypes.LayoutMillimeters))
    map.attemptResize(QgsLayoutSize(200, 200, QgsUnitTypes.LayoutMillimeters))
    
    # Create Legend *** NEED TO GET TEMP VALUES IN LEGENED ***
    legend = QgsLayoutItemLegend(layout)
    legend.setTitle("")
    layer.setName("Temperature (C)") # change layer name for legend
    layerTree = QgsLayerTree()
    layerTree.addLayer(layer)
    legend.model().setRootGroup(layerTree)
    legend.setStyleFont(QgsLegendStyle.Subgroup, QFont('Arial', 20))
    layout.addLayoutItem(legend)
    legend.attemptMove(QgsLayoutPoint(140, 0, QgsUnitTypes.LayoutMillimeters))
    # legend.update()
    # layout.removeLayoutItem(legend)
    
    # Add Scalebar
    scalebar = QgsLayoutItemScaleBar(layout)
    scalebar.setStyle('Single Box')
    scalebar.setUnits(QgsUnitTypes.DistanceMeters)
    scalebar.setNumberOfSegments(2)
    scalebar.setNumberOfSegmentsLeft(0)
    scalebar.setUnitsPerSegment(100)
    scalebar.setLinkedMap(map)
    scalebar.setUnitLabel('m')
    scalebar.setFont(QFont('Arial', 20))
    scalebar.update()
    layout.addLayoutItem(scalebar)
    scalebar.attemptMove(QgsLayoutPoint(120, 193, QgsUnitTypes.LayoutMillimeters))
    
    
    scalebar = super(QgsLayoutItem, scalebar)
    scalebar.setBrush(QColor(255,255,255)) # This isn't working
    
    # Add Title
    #   Generate Titles
    date_time = re.split("T[1/2/3] ", fname)[1]
    date_only = re.split(" ", date_time)[0]
    time_only = re.split(" ", date_time)[1]
    time_only = re.split("-", time_only)[0]+":"+re.split("-", time_only)[1]
    
    #    Date Title
    title = QgsLayoutItemLabel(layout)
    title.setText(date_only)
    title.setFont(QFont('Arial', 30))
    title.adjustSizeToText()
    title.setBackgroundColor(QColor(255, 255, 255, 255)) # Not working???
    layout. addLayoutItem(title)
    title.attemptMove(QgsLayoutPoint(3, 3, QgsUnitTypes.LayoutMillimeters))
    # title.update()
    # layout.removeLayoutItem(title2)
    
    #   Time Title
    title2 = QgsLayoutItemLabel(layout)
    title2.setText(time_only)
    title2.setFont(QFont('Arial', 30))
    title2.adjustSizeToText()
    title2.setBackgroundColor(QColor(255, 255, 255, 255)) # Not working???
    layout. addLayoutItem(title2)
    title2.attemptMove(QgsLayoutPoint(3, 20, QgsUnitTypes.LayoutMillimeters))
    
    # Export Map Layout
    # layout = manager.layoutByName(layoutName)
    exporter = QgsLayoutExporter(layout)
    fn = export_folder + "/" + fname + ".jpg" # file export directory and filename
    exporter.exportToImage(fn, QgsLayoutExporter.ImageExportSettings())

1 Answer 1

3

You need to enable the background (it is white by default).

title.setBackgroundEnabled(True)

enter image description here

1
  • 1
    Thank you, this worked perfectly!
    – ia200
    Feb 17, 2022 at 20:13

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.