def make_test_table(lut=False):
from ctf import ColorTransferFunction, PiecewiseFunction
if lut:
table = tvtk.LookupTable()
table.table_range = (255, 355)
return table, None, None
else:
table = tvtk.VolumeProperty()
ctf = ColorTransferFunction()
mins, maxs = 255, 355
ds = (maxs-mins)/4.0
try:
ctf.range = (mins, maxs)
except Exception:
# VTK versions < 5.2 don't seem to need this.
pass
ctf.add_rgb_point(mins, 0.00, 0.0, 1.00)
ctf.add_rgb_point(mins+ds, 0.25, 0.5, 0.75)
ctf.add_rgb_point(mins+2*ds, 0.50, 1.0, 0.50)
ctf.add_rgb_point(mins+3*ds, 0.75, 0.5, 0.25)
ctf.add_rgb_point(maxs, 1.00, 0.0, 0.00)
otf = PiecewiseFunction()
otf.add_point(255, 0.0)
otf.add_point(355, 0.2)
table.set_color(ctf)
table.set_scalar_opacity(otf)
return table, ctf, otf
def show(d):
l = tvtk.LookupTable(table_range=(0, 1))
m = tvtk.PolyDataMapper(input=d.output,
scalar_visibility=True,
scalar_mode="use_cell_data")
p = tvtk.Property(representation="s")
a = tvtk.Actor(mapper=m, property=p)
ren = tvtk.Renderer(background=(.1, .2, .4))
ren.add_actor(a)
rw = tvtk.RenderWindow(size=(600, 600))
rw.add_renderer(ren)
rwi = tvtk.RenderWindowInteractor(render_window=rw)
rwi.initialize()
rwi.start()
def set_colormap(self, c):
if isinstance(c, str):
lut = tvtk.LookupTable()
c = gf_colormap(c)
lut.number_of_table_values = c.shape[0]
for i in range(c.shape[0]):
lut.set_table_value(i, c[i, 0], c[i, 1], c[i, 2], 1)
elif isinstance(c, tvtk.LookupTable):
lut = c
else:
raise Exception("expected a string or a tvtk.LookupTable")
self.lookup_table = lut
if (self.mapper is not None):
self.mapper.lookup_table = self.lookup_table
if (self.scalar_bar is not None):
self.scalar_bar.lookup_table = self.lookup_table
def _setup_scene(self):
# scalar bar for strain
lut_strain = tvtk.LookupTable(hue_range=(0.66, 0.0))
lut_strain.build()
self._scalar_bar_strain = tvtk.ScalarBarActor(
lookup_table=lut_strain,
orientation='horizontal',
text_position='succeed_scalar_bar',
maximum_number_of_colors=256,
number_of_labels=9,
position=(0.1, 0.01),
position2=(0.8, 0.08),
title='element strain (%)',
visibility=False)
self.scene.add_actor(self._scalar_bar_strain)
# scalar bar for stress
# lookup table from green to yellow, and last 2 values dark red
lut_stress = tvtk.LookupTable(hue_range=(0.33, 0.1),
number_of_table_values=256)
lut_stress.build()
lut_stress.set_table_value(254, (1.0, 0.4, 0.0, 1.0))
lut_stress.set_table_value(255, (1.0, 0.0, 0.0, 1.0))
self._scalar_bar_stress = tvtk.ScalarBarActor(
lookup_table=lut_stress,
orientation='horizontal',
text_position='succeed_scalar_bar',
maximum_number_of_colors=256,
number_of_labels=9,
position=(0.1, 0.01),
position2=(0.8, 0.08),
title='element stress',
visibility=False)
self.scene.add_actor(self._scalar_bar_stress)
# setup elements visualization
self._elements_polydata = tvtk.PolyData()
self._tubes = tvtk.TubeFilter(
input=self._elements_polydata,
number_of_sides=6,
vary_radius='vary_radius_by_absolute_scalar',
radius_factor=1.5)
mapper = tvtk.PolyDataMapper(input=self._tubes.output,
lookup_table=lut_strain,
interpolate_scalars_before_mapping=True,
scalar_mode='use_cell_data')
self._elements_actor = tvtk.Actor(mapper=mapper)
self.scene.add_actor(self._elements_actor)
# show elements in deformed state as wireframe
self._deformed_elements_polydata = tvtk.PolyData()
self._deformed_elements_actor = tvtk.Actor(mapper=tvtk.PolyDataMapper(
input=self._deformed_elements_polydata))
self._deformed_elements_actor.property.set(opacity=0.2,
representation='wireframe')
self.scene.add_actor(self._deformed_elements_actor)
# highlight one element via a ribbon outline
self._hl_element_ribbons = tvtk.RibbonFilter(input=tvtk.PolyData(),
use_default_normal=True,
width=1.0)
self._hl_element_actor = tvtk.Actor(
mapper=tvtk.PolyDataMapper(input=self._hl_element_ribbons.output),
visibility=False)
self._hl_element_actor.property.set(ambient=1,
ambient_color=(1, 1, 1),
diffuse=0)
self.scene.add_actor(self._hl_element_actor)
# cross sectional radius labels
self._elements_label_polydata = tvtk.PolyData()
self._label_cellcenters = tvtk.CellCenters(
input=self._elements_label_polydata)
self._label_visps = tvtk.SelectVisiblePoints(
renderer=self.scene.renderer,
input=self._label_cellcenters.output,
tolerance=10000)
self._label_actor = tvtk.Actor2D(mapper=tvtk.Dynamic2DLabelMapper(
input=self._label_visps.output, label_mode='label_scalars'))
self._label_actor.mapper.label_text_property.set(
bold=True, italic=False, justification='centered', font_size=14)
#self.scene.add_actor(self._label_actor)
# force glyphs (use arrows for that)
self._force_glyphs = tvtk.Glyph3D(scale_mode='scale_by_vector',
vector_mode='use_vector',
color_mode='color_by_vector',
scale_factor=1.)
self._force_glyphs.set_source(
0,
tvtk.ArrowSource(shaft_radius=0.04,
tip_resolution=8,
tip_radius=0.2).output)
self._force_polydata = tvtk.PolyData()
self._force_glyphs.set_input(0, self._force_polydata)
self._force_actor = tvtk.Actor(mapper=tvtk.PolyDataMapper(
input=self._force_glyphs.output, scalar_range=(0, 10)))
self._force_actor.mapper.lookup_table.hue_range = (0.33, 0.0)
self.scene.add_actor(self._force_actor)
# current status display
self._text_actor = tvtk.TextActor(position=(0.5, 0.95))
self._text_actor.position_coordinate.coordinate_system = 'normalized_display'
self._text_actor.text_property.set(font_size=14,
justification='center')
self.scene.add_actor(self._text_actor)
# a nice gradient background
self.scene.renderer.set(background2=(0.28, 0.28, 0.28),
background=(0.01, 0.01, 0.02),
gradient_background=True)
# setup events
self.interaction_mode = 'select'
self.scene.interactor.add_observer('MouseMoveEvent', self._mouse_move)
self.scene.interactor.add_observer('LeftButtonPressEvent',
self._mouse_press)
self.scene.renderer.add_observer('StartEvent', self._before_render)
self._on_init = True
self._reset_zoom_needed = True
def save(self, file_name):
"""Save control point set into a new file FileName. It is not checked
whether the file already exists. Further writes out a VTK .lut file
and a .jpg file showing the gradients."""
# Ensure that if the input file name had one of the extensions
# we'll be writing out ourselves, it gets stripped out first.
path_base, ext = splitext(file_name)
#print(file_name)
if ext.lower() in ['.lut', '.jpg', '.jpeg', '.grad']:
ext = ''
file_name = path_base + ext
# Create the three names for the files we'll be actually
# writing out.
file_name_grad = file_name + '.grad'
file_name_lut = file_name + '.lut'
file_name_jpg = file_name + '.jpg'
# write control points set.
file = open(file_name_grad, "w")
file.write("V 2.0 Color Gradient File\n")
file.write("ScalingFunction: %s\n" % (self.scaling_function_string))
file.write("ScalingParameter: %s\n" %
(self.scaling_function_parameter))
file.write("ControlPoints: (pos fixed bindings h s v a)\n")
for control_point in self.control_points:
file.write( " %s %s %s %s %s %s %s\n" % ( \
control_point.pos, control_point.fixed, control_point.active_channels,
control_point.color.get_hsva()[0], control_point.color.get_hsva()[1],
control_point.color.get_hsva()[2], control_point.color.get_hsva()[3] ) )
file.close()
# write vtk lookup table. Unfortunatelly these objects don't seem to
# have any built in and exposed means of loading or saving them, so
# we build the vtk file directly
vtk_table = tvtk.LookupTable()
self.store_to_vtk_lookup_table(vtk_table)
file = open(file_name_lut, "w")
num_colors = vtk_table.number_of_table_values
file.write("LOOKUP_TABLE UnnamedTable %s\n" % (num_colors))
for idx in range(num_colors):
entry = vtk_table.get_table_value(idx)
file.write("%.4f %.4f %.4f %.4f\n" %
(entry[0], entry[1], entry[2], entry[3]))
file.close()
# if the python image library is aviable, also generate a small .jpg
# file showing how the gradient looks. Based on code from Arnd Baecker.
try:
import Image
except ImportError:
pass # we're ready otherwise. no jpg output tho.
else:
Ny = 64 # vertical size of the jpeg
im = Image.new("RGBA", (num_colors, Ny))
for nx in range(num_colors):
(r, g, b, a) = vtk_table.get_table_value(nx)
for ny in range(Ny):
im.putpixel((nx, ny), (int(255 * r), int(
255 * g), int(255 * b), int(255 * a)))
im.save(file_name_jpg, "JPEG")
def read_data():
# 读入数据
plot3d = tvtk.PLOT3DReader(xyz_file_name=vtk_data("combxyz.bin"),
q_file_name=vtk_data("combq.bin"),
scalar_function_number=100,
vector_function_number=200)
plot3d.update()
return plot3d
if __name__ == "__main__":
plot3d = read_data()
# 创建颜色映射表
lut = tvtk.LookupTable()
import pylab as pl
lut.table = pl.cm.cool(np.arange(0, 256)) * 255
# 显示StructuredGrid中的一个网格面
plane = tvtk.StructuredGridGeometryFilter(input=plot3d.output,
extent=(0, 100, 0, 100, 6, 6))
plane_mapper = tvtk.PolyDataMapper(lookup_table=lut, input=plane.output)
plane_mapper.scalar_range = plot3d.output.scalar_range
plane_actor = tvtk.Actor(mapper=plane_mapper)
# 做一个平面切面
cut_plane = tvtk.Plane(origin=plot3d.output.center,
normal=(-0.287, 0, 0.9579))
cut = tvtk.Cutter(input=plot3d.output, cut_function=cut_plane)
cut_mapper = tvtk.PolyDataMapper(input=cut.output, lookup_table=lut)
