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import dash
import dash_vtk
import dash_bootstrap_components as dbc
import dash_html_components as html
import dash_core_components as dcc
from dash.dependencies import Input, Output, State
import random
import json
import numpy as np
import pyvista as pv
from pyvista import examples
from vtk.util.numpy_support import vtk_to_numpy
from dash_vtk.utils import presets
random.seed(42)
def toDropOption(name):
return {"label": name, "value": name}
uniformGrid = examples.download_crater_topo()
subset = uniformGrid.extract_subset((500, 900, 400, 800, 0, 0), (5, 5, 1))
def updateWarp(factor=1):
terrain = subset.warp_by_scalar(factor=factor)
polydata = terrain.extract_geometry()
points = polydata.points.ravel()
polys = vtk_to_numpy(polydata.GetPolys().GetData())
elevation = polydata["scalar1of1"]
min_elevation = np.amin(elevation)
max_elevation = np.amax(elevation)
return [points, polys, elevation, [min_elevation, max_elevation]]
points, polys, elevation, color_range = updateWarp(1)
app = dash.Dash(__name__, external_stylesheets=[dbc.themes.BOOTSTRAP])
server = app.server
vtk_view = dash_vtk.View(
id="vtk-view",
pickingModes=["hover"],
children=[
dash_vtk.GeometryRepresentation(
id="vtk-representation",
children=[
dash_vtk.PolyData(
id="vtk-polydata",
points=points,
polys=polys,
children=[
dash_vtk.PointData(
[
dash_vtk.DataArray(
id="vtk-array",
registration="setScalars",
name="elevation",
values=elevation,
)
]
)
],
)
],
colorMapPreset="erdc_blue2green_muted",
colorDataRange=color_range,
property={"edgeVisibility": True},
showCubeAxes=True,
cubeAxesStyle={"axisLabels": ["", "", "Altitude"]},
),
dash_vtk.GeometryRepresentation(
id="pick-rep",
actor={"visibility": False},
children=[
dash_vtk.Algorithm(
id="pick-sphere",
vtkClass="vtkSphereSource",
state={"radius": 100},
)
],
),
],
)
app.layout = dbc.Container(
fluid=True,
style={"height": "100vh"},
children=[
dbc.Row(
[
dbc.Col(
children=dcc.Slider(
id="scale-factor",
min=0.1,
max=5,
step=0.1,
value=1,
marks={0.1: "0.1", 5: "5"},
)
),
dbc.Col(
children=dcc.Dropdown(
id="dropdown-preset",
options=list(map(toDropOption, presets)),
value="erdc_rainbow_bright",
),
),
dbc.Col(
children=dcc.Checklist(
id="toggle-cube-axes",
options=[
{"label": " Show axis grid", "value": "grid"},
],
value=[],
labelStyle={"display": "inline-block"},
),
),
],
style={"height": "12%", "alignItems": "center"},
),
html.Div(
html.Div(vtk_view, style={"height": "100%", "width": "100%"}),
style={"height": "88%"},
),
html.Pre(
id="tooltip",
style={
"position": "absolute",
"bottom": "25px",
"left": "25px",
"zIndex": 1,
"color": "white",
},
),
],
)
@app.callback(
[
Output("vtk-representation", "showCubeAxes"),
Output("vtk-representation", "colorMapPreset"),
Output("vtk-representation", "colorDataRange"),
Output("vtk-polydata", "points"),
Output("vtk-polydata", "polys"),
Output("vtk-array", "values"),
Output("vtk-view", "triggerResetCamera"),
],
[
Input("dropdown-preset", "value"),
Input("scale-factor", "value"),
Input("toggle-cube-axes", "value"),
],
)
def updatePresetName(name, scale_factor, cubeAxes):
points, polys, elevation, color_range = updateWarp(scale_factor)
return [
"grid" in cubeAxes,
name,
color_range,
points,
polys,
elevation,
random.random(),
]
@app.callback(
[
Output("tooltip", "children"),
Output("pick-sphere", "state"),
Output("pick-rep", "actor"),
],
[
Input("vtk-view", "clickInfo"),
Input("vtk-view", "hoverInfo"),
],
)
def onInfo(clickData, hoverData):
info = hoverData if hoverData else clickData
if info:
if (
"representationId" in info
and info["representationId"] == "vtk-representation"
):
return (
[json.dumps(info, indent=2)],
{"center": info["worldPosition"]},
{"visibility": True},
)
return dash.no_update, dash.no_update, dash.no_update
return [""], {}, {"visibility": False}
if __name__ == "__main__":
app.run_server(debug=True)
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