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"""Visualize scalar values interactively
by hovering the mouse on a mesh
Press c to clear the path"""
from vedo import *
def func(evt): ### called every time mouse moves!
msh = evt.object # get the mesh that triggered the event
if not msh:
return # mouse hits nothing, return.
pt = evt.picked3d # 3d coords of point under mouse
pid = msh.closest_point(pt, return_point_id=True)
txt =(
f"Point: {precision(pt[:2] ,2)}\n"
f"Height: {precision(arr[pid],3)}\n"
f"Ground speed: {precision(evt.speed3d*100,2)}"
)
msg.text(txt) # update text message
ar = Arrow(pt - evt.delta3d, pt, s=0.001, c='orange5')
fp = msh.flagpole(
txt, point=pt,s=0.04, c='k', font="VictorMono",
)
fp.follow_camera() # make it always face the camera
plt.remove("FlagPole").add(ar, fp) # remove the old flagpole, add the new
plt.render()
msg = Text2D(pos='bottom-left', font="VictorMono") # an empty text
hil = ParametricShape('RandomHills').cmap('terrain').add_scalarbar()
arr = hil.pointdata["Scalars"] # numpy array with heights
plt = Plotter(axes=1, bg2='lightblue')
plt.add_callback('mouse move', func) # add the callback function
plt.add_callback('keyboard', lambda _: plt.remove("Arrow").render())
plt.show(hil, msg, __doc__, viewup='z')
plt.close()
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