I am looking for a way to change the direction of the pie charts of a layer from counter-clockwise to clockwise in QGIS 3. I looked in the docs but I don´t seem to find a way to do this. Does anybody know what I need to do?

I create the pie charts like this:

current_colors = {}  # maps the field names to QColor objects
diagram = QgsPieDiagram()
ds = QgsDiagramSettings()
ds.categoryColors = current_colors.values()
ds.categoryAttributes = current_colors.keys()
ds.categoryLabels = ds.categoryAttributes

dr = QgsLinearlyInterpolatedDiagramRenderer()
max_val = layer.maximumValue(layer.fields().indexFromName(pie_sum_col))
dr.setLowerSize(QSizeF(2, 2))
dr.setUpperSize(QSizeF(40, 40))
dls = QgsDiagramLayerSettings()
  • What is the current_colors ?
    – Taras
    May 3, 2022 at 14:00
  • Sorry, I forgot to clarify. It is a dictionary that maps the field names of the layer to some QColor objects (I also added a comment in the question) May 4, 2022 at 9:39

1 Answer 1


QGIS Diagram settings way :

ds = QgsDiagramSettings()
# counter-clockwise direction
# clockwise direction

Basic way :

Your current Python dictionnary is :

current_colors = {
    '"field_one"': QColor("#FF0000"),
    '"field_two"': QColor("#00FF00"),
    '"field_three"': QColor("#0000FF"),

The result are diagrams in counter-clockwise order. So, just reverse the order of current_colors :

current_colors = {
    '"field_three"': QColor("#0000FF"),
    '"field_two"': QColor("#00FF00"),
    '"field_one"': QColor("#FF0000"),

or if you don't want to do this manually :

current_colors = {k: current_colors[k] for k in reversed(current_colors)}

The result will be diagrams in clockwise order.

  • 1
    Thanks for the idea! Unfortunately this is not exactly what I intended. When you look in the GUI at the layer tree you will still have to inspect the different entries counter-clockwise since their order will also shift. If I however, click on the layer -> properties -> Diagrams -> Rendering and set the Direction to Clockwise it will do as intended. Is there not the possibility to trigger this via pyqgis? May 11, 2022 at 11:54
  • @Christian: ok, I didn't know this option, so, see my edit. May 11, 2022 at 12:15
  • Perfect, that works just fine! Thanks for the help. May 12, 2022 at 8:09

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