[Qgis-user] Adding QgsLayoutItemPolyline to the print layout legend

[Nyall Dawson]

On Sun, 20 Oct 2024, 9:16 am Asim al-sofi via QGIS-User, <
qgis-user at lists.osgeo.org> wrote:

> Hi all
> Iam trying to add legend to the print layout of a polyline that have been
> created using QgsLayoutItemPolyline.
> I managed to draw the polyline on the map composer and play with its
> properties, but could not add the corresponding line to the legend.
> Any ideas/suggestions?
> The code that corresponds to the legend is:
>
> polygon2 = QPolygonF()
> polygon2.append(QPointF(50.0, 150.0))
> polygon2.append(QPointF(150.0, 80.0))
> polygon2.append(QPointF(250.0, 100.0))
> polygon2.append(QPointF(10.0, 200.0))
> layoutItemPolyline = QgsLayoutItemPolyline(polygon2, layout)
> layout.addLayoutItem(layoutItemPolyline)
>
> props = {}
> props["color"] = "green"
> props["style"] = "solid"
>
> symbol = QgsLineSymbol.createSimple(props)
> layoutItemPolyline.setSymbol(symbol)
> legend = QgsLayoutItemLegend(layout)
> legend.setAutoUpdateModel(False)
> root = legend.model().rootGroup()
> legend = QgsLayoutItemLegend(layout)
> legend.setTitle("Legend")
> legend.setAutoUpdateModel(False)
> legend.setLinkedMap(map)
> legend.setLegendFilterByMapEnabled(True)
> layout.addLayoutItem(legend)
> legend.attemptMove(QgsLayoutPoint(235, 36, QgsUnitTypes.LayoutMillimeters))
>

Add a temporary memory layer to the project with the same line symbol as
the polyline item, then add that temporary layer to the legend.

(This trick also works for adding additional points or fills to a legend)

Nyall


>
> Thanks in advance
> Kind regards,
> Asim
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