fieldline test with seed, new symmetry baseline from bounding box fix

Author: ChrLackner

ngsolve_webgpu/cf.py

@@ -1076,6 +1076,7 @@ def __init__(
         direction: int = 0,
         colormap=None,
         clipping=None,
+        seed: int | None = None,
     ):
         import ngsolve as ngs
         self.fieldline_options = {
@@ -1086,6 +1087,7 @@ def __init__(
             "tolerance": tolerance,
             "direction": direction,
         }
+        self.seed = seed
         self.cf = cf
         if isinstance(start_region, ngs.Mesh):
             self.mesh = start_region
@@ -1107,8 +1109,11 @@ def get_bounding_box(self):
         return ([pmin[0], pmin[1], pmin[2]], [pmax[0], pmax[1], pmax[2]])
 
     def update(self, options):
+        import numpy as np
         from ngsolve.webgui import FieldLines
 
+        if self.seed is not None:
+            np.random.seed(self.seed)
         data = FieldLines(self.cf, self.start_region, **self.fieldline_options)
         bbox = self.mesh.ngmesh.bounding_box
         thickness = (bbox[1] - bbox[0]).Norm() * self.fieldline_options["thickness"]

tests/baselines/fieldlines.png

@@ -101,7 +101,7 @@ def test_fieldlines(self, webgpu_env):
         webgpu_env.ensure_canvas(600, 600)
         mesh = ngs.Mesh(ngs.unit_cube.GenerateMesh(maxh=0.5))
         cf = ngs.CF((ngs.x, ngs.y, ngs.z))
-        renderer = FieldLines(cf, mesh, num_lines=20)
+        renderer = FieldLines(cf, mesh, num_lines=20, seed=42)
         scene = wj.Draw([renderer], 600, 600)
 
-        webgpu_env.assert_matches_baseline(scene, "fieldlines.png", threshold=0.05)
+        webgpu_env.assert_matches_baseline(scene, "fieldlines.png")