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import conduit
import conduit.blueprint
import ascent
import numpy as np


mesh = conduit.Node()
conduit.blueprint.mesh.examples.braid("hexs",
                                      25,
                                      25,
                                      25,
                                      mesh)

# Use Ascent to calculate and render contours
a = ascent.Ascent()
a.open()

# publish our mesh to ascent
a.publish(mesh);

# setup actions
actions = conduit.Node()
add_act = actions.append()
add_act["action"] = "add_pipelines"
pipelines = add_act["pipelines"]

# create a  pipeline (pl1) with a contour filter (f1)
pipelines["pl1/f1/type"] = "contour"

# extract contours where braid variable
# equals 0.2 and 0.4
contour_params = pipelines["pl1/f1/params"]
contour_params["field"] = "braid"
iso_vals = np.array([0.2, 0.4],dtype=np.float32)
contour_params["iso_values"].set(iso_vals)

# declare a scene to render the pipeline result

add_act2 = actions.append()
add_act2["action"] = "add_scenes"
scenes = add_act2["scenes"]

# add a scene (s1) with one pseudocolor plot (p1) that 
# will render the result of our pipeline (pl1)
scenes["s1/plots/p1/type"] = "pseudocolor"
scenes["s1/plots/p1/pipeline"] = "pl1"
scenes["s1/plots/p1/field"] = "braid"
# set the output file name (ascent will add ".png")
scenes["s1/image_name"] = "out_pipeline_ex1_contour"

# print our full actions tree
print(actions.to_yaml())

# execute the actions
a.execute(actions)

a.close()