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Add support for extra traces #40
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736c0ff
Add support for additional traces, plus example to demo it
almarklein b9e78f1
update readme
almarklein 054c5d4
forgot to add example
almarklein 016697a
each contour a different color
almarklein b91edb5
change the wording in the docstring a bit
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Original file line number | Diff line number | Diff line change |
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""" | ||
An example demonstrating adding traces. | ||
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This shows a volume with a contour overlaid on top. The `extra_traces` | ||
property is used to add scatter traces that represent the contour. | ||
""" | ||
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import dash | ||
import dash_html_components as html | ||
import dash_core_components as dcc | ||
from dash.dependencies import Input, Output | ||
from dash_slicer import VolumeSlicer | ||
import imageio | ||
from skimage import measure | ||
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app = dash.Dash(__name__, update_title=None) | ||
server = app.server | ||
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vol = imageio.volread("imageio:stent.npz") | ||
mi, ma = vol.min(), vol.max() | ||
slicer = VolumeSlicer(app, vol) | ||
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app.layout = html.Div( | ||
[ | ||
slicer.graph, | ||
slicer.slider, | ||
dcc.Slider( | ||
id="level-slider", | ||
min=mi, | ||
max=ma, | ||
step=1, | ||
value=mi + 0.2 * (ma - mi), | ||
), | ||
*slicer.stores, | ||
] | ||
) | ||
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@app.callback( | ||
Output(slicer.extra_traces.id, "data"), | ||
[Input("level-slider", "value"), Input(slicer.state.id, "data")], | ||
) | ||
def apply_levels(level, state): | ||
if not state: | ||
return dash.no_update | ||
slice = vol[state["index"]] | ||
contours = measure.find_contours(slice, level) | ||
traces = [] | ||
for contour in contours: | ||
traces.append( | ||
{ | ||
"type": "scatter", | ||
"mode": "lines", | ||
"line": {"color": "cyan", "width": 3}, | ||
"x": contour[:, 1], | ||
"y": contour[:, 0], | ||
} | ||
) | ||
return traces | ||
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if __name__ == "__main__": | ||
# Note: dev_tools_props_check negatively affects the performance of VolumeSlicer | ||
app.run_server(debug=True, dev_tools_props_check=False) |
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Could you use different colors here for the different contours? It would make the example clearer.
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I thought that each
contour
was a linepiece, but I just learned they are each one closed contour. Cool!