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Add new function rotate_to_next_standard_view. #55

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Merged
hsorby merged 1 commit into from
Aug 9, 2025
Merged

Add new function rotate_to_next_standard_view. #55

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31 changes: 31 additions & 0 deletions src/cmlibs/utils/zinc/general.py
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Original file line number Diff line number Diff line change
Expand Up @@ -6,6 +6,8 @@
from cmlibs.zinc.context import Context
from cmlibs.zinc.result import RESULT_OK

from cmlibs.maths.vectorops import normalize, sub, magnitude, dot, mult


def is_exf_file(filename):
if not os.path.isfile(filename):
Expand Down Expand Up @@ -168,5 +170,34 @@ def create_node(field_module, data_object, identifier=-1, node_set_name='nodes',
return node.getIdentifier()


def rotate_to_next_standard_view(scene_viewer):
if scene_viewer is not None:
result, eyePosition, lookAtPosition, upVector = scene_viewer.getLookatParameters()
upVector = normalize(upVector)
viewVector = sub(lookAtPosition, eyePosition)
viewDistance = magnitude(viewVector)
viewVector = normalize(viewVector)
# viewX = dot(viewVector, [1.0, 0.0, 0.0])
viewY = dot(viewVector, [0.0, 1.0, 0.0])
viewZ = dot(viewVector, [0.0, 0.0, 1.0])
# upX = dot(upVector, [1.0, 0.0, 0.0])
upY = dot(upVector, [0.0, 1.0, 0.0])
upZ = dot(upVector, [0.0, 0.0, 1.0])
if (viewZ < -0.999) and (upY > 0.999):
# XY -> XZ
viewVector = [0.0, 1.0, 0.0]
upVector = [0.0, 0.0, 1.0]
elif (viewY > 0.999) and (upZ > 0.999):
# XZ -> YZ
viewVector = [-1.0, 0.0, 0.0]
upVector = [0.0, 0.0, 1.0]
else:
# XY
viewVector = [0.0, 0.0, -1.0]
upVector = [0.0, 1.0, 0.0]
eyePosition = sub(lookAtPosition, mult(viewVector, viewDistance))
scene_viewer.setLookatParametersNonSkew(eyePosition, lookAtPosition, upVector)


defineStandardGraphicsObjects = define_standard_graphics_objects
createNode = create_node
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