Parses a .qgs XML file and extracts symbology (fill, stroke, classification, labels) for all vector layers into a list suitable for writing to registry.json.
Value
A list with name, version, source, and layers elements.
Each layer contains type, source_layer, fill/stroke/classification/label as applicable.
Examples
path <- system.file("examples", "mini_project.qgs", package = "gq")
reg <- gq_qgs_extract(path)
# Shows all layers extracted from the QGIS project
names(reg$layers)
#> [1] "lakes" "streams" "crossings" "roads"
# Polygon layer — fill and stroke extracted from SimpleFill symbol
reg$layers$lakes
#> $type
#> [1] "polygon"
#>
#> $source_layer
#> [1] "lakes"
#>
#> $fill
#> $fill$color
#> [1] "#c6ddf0"
#>
#> $fill$opacity
#> [1] 0.851
#>
#>
#> $stroke
#> $stroke$color
#> [1] "#7ba7cc"
#>
#> $stroke$width
#> [1] 0.5
#>
#>
# Categorized layer — classification field and per-class colors
reg$layers$roads$classification
#> $field
#> [1] "road_type"
#>
#> $classes
#> $classes$highway
#> $classes$highway$color
#> [1] "#c0392b"
#>
#> $classes$highway$width
#> [1] 2
#>
#> $classes$highway$label
#> [1] "Highway"
#>
#>
#> $classes$arterial
#> $classes$arterial$color
#> [1] "#e67e22"
#>
#> $classes$arterial$width
#> [1] 1.5
#>
#> $classes$arterial$label
#> [1] "Arterial"
#>
#>
#>
# Labels — font, size, weight, halo all captured
reg$layers$roads$label
#> $field
#> [1] "road_name"
#>
#> $font
#> [1] "Arial"
#>
#> $size
#> [1] 10
#>
#> $weight
#> [1] "bold"
#>
#> $color
#> [1] "#1a3c5e"
#>
#> $halo
#> $halo$color
#> [1] "#ffffff"
#>
#> $halo$width
#> [1] 1.5
#>
#>