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- """Visualize scalar values interactively
- by hovering the mouse on a mesh
- Press c to clear the path"""
- from vedo import precision, Arrow, Text2D, ParametricShape, Plotter
- 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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