add Arrow.top_point() and Arrow.base_point() in #1163

docs/changes.md

@@ -7,7 +7,8 @@
 - add `mesh.laplacian_diffusion()`
 - fix `DistanceTool` in #1158
 - fix `shapes.Plane.normal` in #1159 by @smoothumut
-
+- add `Arrow.top_point()` and `Arrow.base_point()` to extract current arrow position #1163 @smoothumut
+- fix `Arrow.top_index` to produce the correct index value
 
 
 

vedo/core.py

@@ -2088,7 +2088,7 @@ def isosurface(self, value=None, flying_edges=False) -> "vedo.mesh.Mesh":
         )
         return out
 
-    def isosurface_discrete(self, value=None, nsmooth=15) -> "vedo.mesh.Mesh":
+    def isosurface_discrete(self, values, nsmooth=15) -> "vedo.mesh.Mesh":
         """
         Create boundary/isocontour surfaces from a label map (e.g., a segmented image) using a threaded,
         3D version of the multiple objects/labels Surface Nets algorithm.
@@ -2097,6 +2097,11 @@ def isosurface_discrete(self, value=None, nsmooth=15) -> "vedo.mesh.Mesh":
         labeled regions / objects.
         (Note that on output each region [corresponding to a different segmented object] will share
         points/edges on a common boundary, i.e., two neighboring objects will share the boundary that separates them).
+        
+        Besides output geometry defining the surface net, the filter outputs a two-component celldata array indicating
+        the labels on either side of the polygons composing the output Mesh. 
+        (This can be used for advanced operations like extracting shared/contacting boundaries between two objects.
+        The name of this celldata array is "BoundaryLabels").
 
         Arguments:
             value : (float, list)
@@ -2107,8 +2112,6 @@ def isosurface_discrete(self, value=None, nsmooth=15) -> "vedo.mesh.Mesh":
         Examples:
             - [isosurfaces2.py](https://github.com/marcomusy/vedo/tree/master/examples/volumetric/isosurfaces2.py)
         """
-        if not utils.is_sequence(value):
-            value = [value]
 
         snets = vtki.new("SurfaceNets3D")
         snets.SetInputData(self.dataset)
@@ -2122,7 +2125,7 @@ def isosurface_discrete(self, value=None, nsmooth=15) -> "vedo.mesh.Mesh":
         else:
             snets.SmoothingOff()
 
-        for i, val in enumerate(value):
+        for i, val in enumerate(values):
             snets.SetValue(i, val)
         snets.Update()
         snets.SetOutputMeshTypeToTriangles()

vedo/mesh.py

@@ -2308,7 +2308,7 @@ def extrude_and_trim_with(
 
     def split(
         self, maxdepth=1000, flag=False, must_share_edge=False, sort_by_area=True
-    ) -> Union[List[Self], Self]:
+    ) -> List[Self]:
         """
         Split a mesh by connectivity and order the pieces by increasing area.
 
@@ -2350,7 +2350,7 @@ def split(
         if flag:
             self.pipeline = OperationNode("split mesh", parents=[self])
             self._update(out)
-            return self
+            return [self]
 
         msh = Mesh(out)
         if must_share_edge:

vedo/shapes.py

@@ -1906,18 +1906,24 @@ def __init__(
         super().__init__(tf.GetOutput(), c, alpha)
 
         self.transform = LinearTransform().translate(start_pt)
-        # self.pos(start_pt)
 
         self.phong().lighting("plastic")
         self.actor.PickableOff()
         self.actor.DragableOff()
         self.base = np.array(start_pt, dtype=float)  # used by pyplot
         self.top  = np.array(end_pt,   dtype=float)  # used by pyplot
-        self.top_index = None
+        self.top_index = self.source.GetTipResolution() * 4
         self.fill = True                    # used by pyplot.__iadd__()
         self.s = s if s is not None else 1  # used by pyplot.__iadd__()
         self.name = "Arrow"
+
+    def top_point(self):
+        """Return the current coordinates of the tip of the Arrow."""
+        return self.transform.transform_point(self.top)
 
+    def base_point(self):
+        """Return the current coordinates of the base of the Arrow."""
+        return self.transform.transform_point(self.base)
 
 class Arrows(Glyph):
     """

vedo/version.py

@@ -1 +1 @@
-_version = '2024.5.2+dev05'
+_version = '2024.5.2+dev06'