mirror of
https://github.com/qgis/QGIS.git
synced 2025-11-04 00:04:25 -05:00
ae00eb965c
This commit sets the framework for allowing expression functions to use named parameters. Ie, instead of: clamp(1,2,3) you can use: clamp( min:=1, value:=2, max:=3) This also allows arguments to be switched, eg: clamp( value:=2, max:=3, min:=1) Additionally, it allows for a more structured definition of function parameters to handle optional arguments and default values for parameters. These are currently being done using a hacky infinite argument list. I've utilised the postgres ':=' syntax for specifying named arguments to avoid potential collisions which may arise with the equality test if we re-used just the '=' operator alone. Sponsored by North Road
14 lines
541 B
Plaintext
14 lines
541 B
Plaintext
{
|
|
"name": "azimuth",
|
|
"type": "function",
|
|
"description": "Returns the north-based azimuth as the angle in radians measured clockwise from the vertical on point_a to point_b.",
|
|
"arguments": [
|
|
{"arg":"point_a","description":"point geometry"},
|
|
{"arg":"point_b","description":"point geometry"}
|
|
],
|
|
"examples": [
|
|
{ "expression":"degrees( azimuth( make_point(25, 45), make_point(75, 100) ) )", "returns":"42.273689"},
|
|
{ "expression":"degrees( azimuth( make_point(75, 100), make_point(25,45) ) )", "returns":"222.273689"}
|
|
]
|
|
}
|