Class: QgsLineSymbol

class qgis.core.QgsLineSymbol(layers: Iterable[QgsSymbolLayer] = [])

Bases: qgis._core.QgsSymbol

Constructor for QgsLineSymbol, with the specified list of initial symbol layers.

Ownership of the layers are transferred to the symbol.

A line symbol type, for rendering LineString and MultiLineString geometries.

Enums

Methods

clone
cloneLayers
createSimple	Create a line symbol with one symbol layer: SimpleLine with specified properties.
dataDefinedWidth	Returns data defined width for whole symbol (including all symbol layers).
renderPolyline	Renders the symbol along the line joining points, using the given render context.
renderUsingLayer
renderVertexMarker
setDataDefinedWidth	Set data defined width for whole symbol (including all symbol layers).
setWidth	Sets the width for the whole line symbol.
width	Returns the estimated width for the whole symbol, which is the maximum width of all marker symbol layers in the symbol.

Signals

Attributes

clone(self) → QgsLineSymbol

cloneLayers()

createSimple(properties: Dict[str, str]) → QgsLineSymbol

Create a line symbol with one symbol layer: SimpleLine with specified properties. This is a convenience method for easier creation of line symbols.

dataDefinedWidth(self) → QgsProperty

Returns data defined width for whole symbol (including all symbol layers).

Returns

data defined width, or invalid property if size is not set at the line level. Caller takes responsibility for deleting the returned object.

See also

setDataDefinedWidth()

New in version 3.0.

renderPolyline(self, points: QPolygonF, f: QgsFeature, context: QgsRenderContext, layer: int = -1, selected: bool = False)

Renders the symbol along the line joining points, using the given render context.

The f argument is used to pass the feature currently being rendered (when available).

If only a single symbol layer from the symbol should be rendered, it should be specified in the layer argument. A layer of -1 indicates that all symbol layers should be rendered.

If selected is true then the symbol will be drawn using the “selected feature” style and colors instead of the symbol’s normal style.

renderUsingLayer()

renderVertexMarker()

setDataDefinedWidth(self, property: QgsProperty)

Set data defined width for whole symbol (including all symbol layers).

See also

dataDefinedWidth()

New in version 3.0.

setWidth(self, width: float)

Sets the width for the whole line symbol. Individual symbol layer sizes will be scaled to maintain their current relative size to the whole symbol size.

See also

width()

width(self) → float

Returns the estimated width for the whole symbol, which is the maximum width of all marker symbol layers in the symbol.

Warning

This returned value is inaccurate if the symbol consists of multiple symbol layers with different width units. Use the overload accepting a QgsRenderContext argument instead for accurate sizes in this case.

See also

setWidth()

width(self, context: QgsRenderContext) -> float Returns the symbol width, in painter units. This is the maximum width of all marker symbol layers in the symbol.

This method returns an accurate width by calculating the actual rendered width of each symbol layer using the provided render context.

See also

setWidth()

New in version 3.4.5.