Add sources to the scene. This script also illustrate most of the controls for sources. Each source is defined by a (x, y, z) MNI coordinate. Then, we can attach some data to sources and project this activity onto the surface (cortical projection). Alternatively, you can run the cortical repartition which is defined as the number of contributing sources per vertex. ```import numpy as np

from visbrain.gui import Brain
from visbrain.objects import SourceObj, BrainObj

kwargs = {}

"""Load the xyz coordinates and corresponding subject name
"""
xyz, subjects = mat['xyz'], mat['subjects']

"""The "subjects" list is composed of 6 diffrents subjects and here we set one
unique color (u_color) per subject.
"""
u_color = ["#9b59b6", "#3498db", "white", "#e74c3c", "#34495e", "#2ecc71"]
kwargs['color'] = [u_color[int(k)] for k in subjects]
kwargs['alpha'] = 0.7

"""
Now we attach data to each source.
"""
kwargs['data'] = np.arange(len(subjects))

"""The source's radius is proportional to the data attached. But this
proportion can be controlled using a minimum and maximum radius
"""
kwargs['edge_color'] = (1, 1, 1, 0.5)  # Color of the edges
kwargs['edge_width'] = .5              # Width of the edges
kwargs['symbol'] = 'square'            # Source's symbol

"""
Next, we mask source's data that are comprised between [20, 40] and color
each source to orange
"""
mask = np.logical_and(kwargs['data'] >= 20., kwargs['data'] <= 40)

"""It's also possible to add text to each source. Here, we show the name of the
subject in yellow.
To avoid a superposition between the text and sources sphere, we introduce an
offset to the text using the s_textshift input
"""
kwargs['text'] = subjects              # Name of the subject
kwargs['text_color'] = "#f39c12"       # Set to yellow the text color
kwargs['text_size'] = 1.5              # Size of the text
kwargs['text_translate'] = (1.5, 1.5, 0)
kwargs['text_bold'] = True

"""Create the source object. If you want to previsualize the result without
opening Brain, use s_obj.preview()
"""
s_obj = SourceObj('SourceExample', xyz, **kwargs)
# s_obj.preview()

"""Color sources according to the data
"""
# s_obj.color_sources(data=kwargs['data'], cmap='viridis')

"""Colorbar properties
"""
cb_kw = dict(cblabel="Project source activity", cbtxtsz=3., border=False, )

"""Define a brain object with the B3 template and project source's activity
onto the surface
"""
b_obj = BrainObj('B3', **cb_kw)
b_obj.project_sources(s_obj, cmap='viridis', vmin=50., under='orange',
vmax=550., over='darkred')

"""Create a Brain instance and pass both of the brain and source object defined
After the interface is opened, press C to display the colorbar.
"""
vb = Brain(source_obj=s_obj, brain_obj=b_obj)
vb.show()
```

Total running time of the script: ( 0 minutes 0.000 seconds)

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