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parametrization.py
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parametrization.py
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"""Copyright (c) 2024 VIKTOR B.V.
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated
documentation files (the "Software"), to deal in the Software without restriction, including without limitation the
rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit
persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the
Software.
VIKTOR B.V. PROVIDES THIS SOFTWARE ON AN "AS IS" BASIS, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT
NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT
SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
"""
from viktor import Color
from viktor.parametrization import (
And,
ColorField,
AutocompleteField,
BooleanField,
DownloadButton,
FileField,
HiddenField,
IsEqual,
IsNotNone,
IsTrue,
LineBreak,
Lookup,
MapSelectInteraction,
NumberField,
OptionField,
OptionListElement,
Section,
SetParamsButton,
Text,
ViktorParametrization,
)
from gis_functions import get_gdf
def _get_field_name_options(params, **kwargs) -> list:
"""Returns all attribute field names"""
try:
gdf = get_gdf(params.shape_input.shapefile_upload, params.shape_input.data_source, params.styling)
field_name_options = gdf.columns.drop(
["geometry", "fill", "description", "fill", "fill-opacity", "stroke-width"]
)
field_name_options = field_name_options.dropna().tolist()
except KeyError: # Create an empty placeholder
field_name_options = [" "]
return field_name_options
def _get_value_options(params, **kwargs) -> list:
"""Return all unique values for a selected attribute field name"""
try:
gdf = get_gdf(params.shape_input.shapefile_upload, params.shape_input.data_source, params.styling)
value_options = gdf[params.attributes.field_name]
attribute_value_options = value_options.dropna().unique().tolist()
except KeyError: # Create an empty placeholder
attribute_value_options = [" "]
return attribute_value_options
class Parametrization(ViktorParametrization):
shape_input = Section("Input")
shape_input.introduction_text = Text(
"Welcome to the VIKTOR sample-GIS app. In this application is shown how to do basic GIS-analysis in VIKTOR."
)
shape_input.data_source = OptionField(
"Data source", options=["Sample data", "Custom data"], variant="radio-inline", default="Sample data"
)
shape_input.sample_data_text = Text(
"Some sample data is loaded to play around with. Additionally, it is possible to upload your "
"own GIS-data (shapefile, geojson, geopackage and dxf are supported). When uploading a shapefile, "
"make sure it is zipped to a single file.",
)
shape_input.line_break = LineBreak()
shape_input.shapefile_upload = FileField(
"Upload file", description="Upload GIS-data", visible=IsEqual("Custom data", Lookup("shape_input.data_source"))
)
shape_input.attribute_results = HiddenField("attribute_results", "attribute_results")
attributes = Section("Filter")
attributes.attribute_field_filter_text = Text(
"Filter shapes by its value, obtained from the attribute table. "
"When the filter is activated, only the shapes are shown for which its values are within the filter."
)
attributes.set_filter = BooleanField("Activate filter")
attributes.line_break3 = LineBreak()
attributes.field_name = OptionField(
"Field names",
options=_get_field_name_options,
description="Field name determines which values can be selected",
visible=IsTrue(Lookup("attributes.set_filter")),
default="Currency",
)
attributes.line_break = LineBreak()
attributes.filter_type = OptionField(
"Filter type",
options=["Unique value", "Range"],
variant="radio-inline",
default="Unique value",
visible=IsTrue(Lookup("attributes.set_filter")),
description="**Unique values:** Set filter by uniques value \n "
"**Range:** Set filter by range. Only works on numerical values.",
)
attributes.line_break2 = LineBreak()
attributes.attribute_value = AutocompleteField(
"Value",
options=_get_value_options,
visible=And(IsEqual("Unique value", Lookup("attributes.filter_type")), IsTrue(Lookup("attributes.set_filter"))),
description="Shapes are filtered on selected value",
default="Euro",
)
attributes.attribute_field_filter_text3 = Text(
"Set value options for selected field name and filter by selected range.",
visible=And(IsEqual("Range", Lookup("attributes.filter_type")), IsTrue(Lookup("attributes.set_filter"))),
)
attributes.minimum_value = NumberField("Minimum value", visible=IsEqual("Range", Lookup("attributes.filter_type")))
attributes.maximum_value = NumberField("Maximum value", visible=IsEqual("Range", Lookup("attributes.filter_type")))
compare = Section("Compare by ranking")
compare.text = Text(
"1. Select shapes on the map to compare. \n "
"2. Then, select the field name with the names of the shapes. \n "
"3. Finally, select the value for which the shapes should be compared. \n "
"The result is shown on the right-hand side of the screen, ranked from high to low."
)
compare.compare_features = SetParamsButton(
"Select shapes to compare",
method="compare_attributes",
interaction=MapSelectInteraction("get_geojson_view", min_select=1, max_select=10),
)
compare.linebreak = LineBreak()
compare.field_name = OptionField(
"Field names",
options=_get_field_name_options,
default="Country",
visible=IsNotNone(Lookup("attribute_results")),
)
compare.selected_value = OptionField(
"Compare for values",
options=_get_field_name_options,
default="Population",
visible=IsNotNone(Lookup("attribute_results")),
)
styling = Section("Styling")
styling.opacity = NumberField("Opacity", variant="slider", min=0, max=1, step=0.1, default=0.5)
styling.color = ColorField("Color", default=Color.from_hex("#0837ff"))
styling.line_width = NumberField("Line width", variant="slider", min=0, max=5, default=1)
download = Section("Download")
download.text = Text(
"Download the GIS-data to any of the output formats as shown below. When the filter is activated,"
" only the filtered data is downloaded."
)
download.output_format_options = OptionField(
"Output format",
options=[
OptionListElement("shapefile", "Shapefile (.shp)"),
OptionListElement("geopackage", "Geopackage (.gpkg)"),
OptionListElement("autocad", "AutoCAD (.DXF)"),
OptionListElement("geojson", "GeoJSON"),
],
default="shapefile",
)
download.output_crs = OptionField(
"CRS output",
options=[OptionListElement("4326", "WGS84 (4326)"), OptionListElement("28992", "RD NEW (28992)"), "Other"],
default=4326,
description="Specify the coordinate system",
)
download.output_crs_other = NumberField(
"CRS output (other)",
description="Enter any EPSG coordinate system here.",
visible=IsEqual("Other", Lookup("download.output_crs")),
)
download.linebreak = LineBreak()
download.download_shapefile = DownloadButton("Download", method="download_geopackage")