interpolated line symbol layer for vector layer (Request in QGIS)

[qgis-bot]

Request for documentation

From pull request qgis/QGIS#42676
Author: @vcloarec
QGIS version: 3.20

interpolated line symbol layer for vector layer

PR Description:

This PR introduces a new renderer symbol layer for line vector layers. This symbol layer is the porting of the mesh layer's edge rendering.

The user can associate attributes or expressions to each line string's extremity (or curve). Value is interpolated along the line string between extremities.
The rendering is done with color and/or width
varying depending on the interpolated value, resulting in a color and width varying line.
The color rendering is set with a color ramp shader widget (like raster and mesh layers).

Funded by Lutra Consulting

Note: text above was changed following the discussion below.

Commits tagged with [need-docs] or [FEATURE]