# qgis / QGIS

Add precision and examples to x, y and z expression functions

DelazJ authored and nyalldawson committed Jul 21, 2020
1 parent d4e6017 commit 5901d5dc6fedc3effa539f0a646b10bcbd74093c
 @@ -2,7 +2,7 @@ "name": "\$x", "type": "function", "groups": ["GeometryGroup"], "description": "Returns the x coordinate of the current feature.", "description": "Returns the x coordinate of the current point feature.", "examples": [ { "expression":"\$x", "returns":"42"} ] }
 @@ -2,7 +2,7 @@ "name": "\$y", "type": "function", "groups": ["GeometryGroup"], "description": "Returns the y coordinate of the current feature.", "description": "Returns the y coordinate of the current point feature.", "examples": [ { "expression":"\$y", "returns":"42"} ] }
 @@ -2,7 +2,7 @@ "name": "x", "type": "function", "groups": ["GeometryGroup"], "description": "Returns the x coordinate of a point geometry, or the x-coordinate of the centroid for a non-point geometry.", "description": "Returns the x coordinate of a point geometry, or the x coordinate of the centroid for a non-point geometry.", "arguments": [ {"arg":"geom","description":"a geometry"}], "examples": [ { "expression":"x( geom_from_wkt( 'POINT(2 5)' ) )", "returns":"2"}, { "expression":"x( \$geometry )", "returns":"x coordinate of the current feature's centroid"}
 @@ -2,7 +2,7 @@ "name": "y", "type": "function", "groups": ["GeometryGroup"], "description": "Returns the y coordinate of a point geometry, or the y-coordinate of the centroid for a non-point geometry.", "description": "Returns the y coordinate of a point geometry, or the y coordinate of the centroid for a non-point geometry.", "arguments": [ {"arg":"geom","description":"a geometry"}], "examples": [ { "expression":"y( geom_from_wkt( 'POINT(2 5)' ) )", "returns":"5"}, { "expression":"y( \$geometry )", "returns":"y coordinate of the current feature's centroid"}
 @@ -2,7 +2,7 @@ "name": "z", "type": "function", "groups": ["GeometryGroup"], "description": "Returns the z coordinate of a point geometry.", "description": "Returns the z coordinate of a point geometry, or Null if the geometry has no z value.", "arguments": [ {"arg":"geom","description":"a point geometry"}], "examples": [ { "expression":"z( geom_from_wkt( 'POINTZ(2 5 7)' ) )", "returns":"7"} ]
 @@ -2,9 +2,12 @@ "name": "z_max", "type": "function", "groups": ["GeometryGroup"], "description": "Returns the maximum z coordinate of a geometry.", "description": "Returns the maximum z coordinate of a geometry, or Null if the geometry has no z value.", "arguments": [ {"arg":"geometry","description":"a geometry with z coordinate"}], "examples": [ { "expression":"z_max( geom_from_wkt( 'POINT ( 0 0 1 )' ) )", "returns":"1"}, { "expression":"z_max( make_line( make_point( 0,0,0 ), make_point( -1,-1,-2 ) ) )", "returns":"0"} { "expression":"z_max( geom_from_wkt( 'MULTIPOINT ( 0 0 1 , 1 1 3 )' ) )", "returns":"3"}, { "expression":"z_max( make_line( make_point( 0,0,0 ), make_point( -1,-1,-2 ) ) )", "returns":"0"}, { "expression":"z_max( geom_from_wkt( 'LINESTRING( 0 0 0, 1 0 2, 1 1 -1 )' ) ), "returns":"2"}, { "expression":"z_max( geom_from_wkt( 'POINT ( 0 0 )' ) )", "returns":"Null"} ] }
 @@ -2,9 +2,12 @@ "name": "z_min", "type": "function", "groups": ["GeometryGroup"], "description": "Returns the minimum z coordinate of a geometry.", "description": "Returns the minimum z coordinate of a geometry, or Null if the geometry has no z value.", "arguments": [ {"arg":"geometry","description":"a geometry with z coordinate"}], "examples": [ { "expression":"z_min( geom_from_wkt( 'POINT ( 0 0 1 )' ) )", "returns":"1"}, { "expression":"z_min( make_line( make_point( 0,0,0 ), make_point( -1,-1,-2 ) ) )", "returns":"-2"} { "expression":"z_min( geom_from_wkt( 'MULTIPOINT ( 0 0 1 , 1 1 3 )' ) )", "returns":"1"}, { "expression":"z_min( make_line( make_point( 0,0,0 ), make_point( -1,-1,-2 ) ) )", "returns":"-2"}, { "expression":"z_min( geom_from_wkt( 'LINESTRING( 0 0 0, 1 0 2, 1 1 -1 )' ) ), "returns":"-1"}, { "expression":"z_min( geom_from_wkt( 'POINT ( 0 0 )' ) )", "returns":"Null"} ] }