Source code for scitools.easyviz.vtk_
from common import *
from scitools.numpyutils import ravel, zeros, array, allclose, rank, \
meshgrid, newaxis
from scitools.globaldata import DEBUG, VERBOSE
from scitools.numpytools import NumPy_dtype
from scitools.misc import test_if_module_exists
test_if_module_exists('vtk', msg='You need to install the VTK package.', abort=False)
import vtk
#import vtk.util.colors
import os
import Tkinter
# use old behavior in Tkinter module to get around issue with Tcl
# (more info: http://www.python.org/doc/2.3/whatsnew/node18.html)
Tkinter.wantobjects = 0
try: import vtkTkRenderWidget
except:
from vtk.tk import vtkTkRenderWidget
[docs]class VtkBackend(BaseClass):
"""Backend using VTK."""
[docs] def init(self):
self._master = None
self.figure(self._attrs['curfig'])
# conversion tables for format strings
self._colors = {
'': (0,0,1), # No color-->Blue
'k': (0,0,0), # Black
'r': (1,0,0), # Red
'g': (0,1,0), # Green
'b': (0,0,1), # Blue
'm': (1,0,1), # Magenta
'c': (0,1,1), # Cyan
'w': (1,1,1), # White
'y': (1,1,0), # Yellow
}
self._arrow_types = { # tuple: (type,rotation)
'': (9,0), # arrow
'.': (0,0), # no marker
'o': (7,0), # circle
'+': (3,0), # plus
'x': (3,45), # x-mark
'*': (3,0), # star --> plus
's': (6,0), # square
'd': (8,0), # diamond
'v': (5,180),# triangle (down)
'^': (5,0), # triangle (up)
'<': (5,90), # triangle (left)
'>': (5,270),# triangle (right)
'p': (6,0), # pentagram --> square
'h': (6,0), # hexagram --> square
}
self._colorbar_locations = {
'North': ((.2, .75), (.6,.09)),
'South': ((.2, .2), (.6, .09)),
'East': ((.75, .09), (.1, .9)),
'West': ((.2, .09), (.1, .9)),
'NorthOutside': ((.2, .86), (.6,.09)),
'SouthOutside': ((.2, .06), (.6, .09)),
'EastOutside': ((.86, .09), (.1, .9)),
'WestOutside': ((.01, .09), (.1, .9))
}
try:
v = vtk.vtkMesaRenderer()
_graphics_fact = vtk.vtkGraphicsFactory()
_graphics_fact.SetUseMesaClasses(1)
_image_fact = vtk.vtkImagingFactory()
_image_fact.SetUseMesaClasses(1)
del _graphics_fact
del _image_fact
del v
except Exception, msg:
if DEBUG:
print "No mesa", msg
def _create_Tk_gui(self):
fig = self.gcf()
if self._master is None:
self._master = Tkinter.Tk()
self._master.withdraw()
fig._root = Tkinter.Toplevel(self._master)
fig._root.title("Easyviz VTK Data Visualizer - Figure %d" % \
self._attrs['curfig'])
# if the window is closed, we should delete the current figure and
# create a new one.
def _close_fig(event=None):
self.clf()
fig._root.withdraw()
fig._root.protocol("WM_DELETE_WINDOW", _close_fig)
fig._root.minsize(200, 200)
fig._root.bind("<KeyPress-q>", _close_fig)
fig._root.withdraw()
master_f = Tkinter.Frame(fig._root, relief='sunken', bd=2)
master_f.pack(side='top', fill='both', expand=1)
renwin_frame = Tkinter.Frame(master_f)
renwin_frame.pack(side='left', fill='both', expand=1)
frame = Tkinter.Frame(renwin_frame)
frame.pack(side='top', fill='both', expand=1)
width, height = fig.getp('size')
if width is None or height is None:
width = 640; height = 480
tkw = vtkTkRenderWidget.vtkTkRenderWidget(frame,
width=width,
height=height)
tkw.pack(expand='true', fill='both')
renwin = tkw.GetRenderWindow()
renwin.SetSize(width, height)
#renwin.SetSize(width+1, height+1)
#renwin.SetSize(width-1, height-1)
#renwin.LineSmoothingOn()
#tkw.UpdateRenderer(0.0, 0.0)
#renwin.Render()
return renwin
def _set_view_old(self):
axis_cam = self._axis.getp('camera')
if not hasattr(self._axis, '_vtk_camera'):
# initialize camera:
pass
else:
# alter camera:
pass
camera = vtk.vtkCamera()
self._axis._renderer.SetActiveCamera(camera)
if axis_cam.getp('camproj') == 'perspective':
camera.ParallelProjectionOff()
else:
camera.ParallelProjectionOn()
fp = axis_cam.getp('camtarget')
camera.SetFocalPoint(fp)
camera.SetViewUp(axis_cam.getp('camup'))
if axis_cam.getp('cammode') == 'auto':
if axis_cam.getp('view') == 3:
camera.SetPosition(fp[0],fp[1]-1,fp[2])
camera.Azimuth(-37.5)
camera.Elevation(30)
else:
camera.SetPosition(fp[0], fp[1], 1)
else:
camera.SetPosition(axis_cam.getp('campos'))
#camera.ComputeViewPlaneNormal()
#camera.OrthogonalizeViewUp()
if axis_cam.getp('camva') is not None:
camera.SetViewAngle(axis_cam.getp('camva'))
azimuth = axis_cam.getp('azimuth')
if azimuth is not None:
if axis_cam.getp('view') == 3:
azimuth += 37.5 # compensate for above
camera.Azimuth(azimuth)
elevation = axis_cam.getp('elevation')
if elevation is not None:
if axis_cam.getp('view') == 3:
elevation -= 30 # compensate for above
camera.Elevation(elevation)
# make all actors fit inside the current scene:
self._axis._renderer.ResetCamera()
camera.Zoom(axis_cam.getp('camzoom'))
self._axis._vtk_camera = camera
def _initialize_camera(self):
ax_cam = self._axis.getp('camera')
camera = vtk.vtkCamera()
fp = ax_cam.getp('camtarget')
camera.SetFocalPoint(fp)
camera.SetViewUp(ax_cam.getp('camup'))
if ax_cam.getp('cammode') == 'auto':
if ax_cam.getp('view') == 3:
camera.SetPosition(fp[0],fp[1]-1,fp[2])
camera.Azimuth(-37.5)
camera.Elevation(30)
else:
camera.SetPosition(fp[0], fp[1], 1)
else:
camera.SetPosition(ax_cam.getp('campos'))
azimuth = ax_cam.getp('azimuth')
if azimuth is not None:
if ax_cam.getp('view') == 3:
azimuth += 37.5 # compensate for above
camera.Azimuth(azimuth)
elevation = ax_cam.getp('elevation')
if elevation is not None:
if ax_cam.getp('view') == 3:
elevation -= 30 # compensate for above
camera.Elevation(elevation)
return camera
def _update_camera(self):
ax_cam = self._axis.getp('camera')
camera = self._axis._vtk_camera
return camera
def _set_view(self):
ax_cam = self._axis.getp('camera')
if not hasattr(self._axis, '_vtk_camera'):
camera = self._initialize_camera()
else:
#camera = self._update_camera()
camera = self._initialize_camera()
if ax_cam.getp('camroll') is not None:
camera.Roll(ax_cam.getp('camroll'))
if ax_cam.getp('camva') is not None:
camera.SetViewAngle(ax_cam.getp('camva'))
if ax_cam.getp('camproj') == 'perspective':
camera.ParallelProjectionOff()
else:
camera.ParallelProjectionOn()
self._axis._renderer.SetActiveCamera(camera)
self._axis._vtk_camera = camera
# make sure all actors are inside the current view:
ren = self._axis._renderer
ren.ResetCamera()
#if self._axis.getp('camera').getp('view') == 2:
# ren.GetActiveCamera().Zoom(1.5)
camera.Zoom(ax_cam.getp('camzoom'))
# set the camera in the vtkCubeAxesActor2D object:
self._axis._vtk_axes.SetCamera(camera)
def _create_labeled_axes(self):
ax = self._axis
if not hasattr(ax, '_vtk_axes'):
ax._vtk_axes = vtk.vtkCubeAxesActor2D()
if ax.getp('visible'):
tprop = vtk.vtkTextProperty()
tprop.SetColor(ax.getp('fgcolor'))
tprop.SetFontSize(ax.getp('fontsize'))
tprop.SetShadow(0)
tprop.SetBold(0)
mode = ax.getp('mode')
if mode in ['auto', 'tight']:
dar = ax.getp('daspect')
bounds = b = list(ax._vtk_apd.GetOutput().GetBounds())
if mode == 'auto':
incr = 0.1
dx = float(b[1] - b[0])
dy = float(b[3] - b[2])
dz = float(b[5] - b[4])
#b[0] -= dx*incr; b[1] += dx*incr
#b[2] -= dy*incr; b[3] += dy*incr
#b[4] -= dz*incr; b[5] += dz*incr
unscaled_bounds = ub = bounds[:]
ub[0] *= dar[0]; ub[1] *= dar[0]
ub[2] *= dar[1]; ub[3] *= dar[1]
ub[4] *= dar[2]; ub[5] *= dar[2]
elif mode == 'fill':
print "axis mode 'fill' not implemented in VtkBackend"
elif mode == 'manual':
bounds = ax._vtk_scaled_bounds
unscaled_bounds = ax._vtk_bounds
#cube_axes = vtk.vtkCubeAxesActor2D()
ax._vtk_axes.SetBounds(bounds)
ax._vtk_axes.SetRanges(unscaled_bounds)
ax._vtk_axes.UseRangesOn()
#ax._vtk_axes.SetCamera(ax._vtk_camera)
ax._vtk_axes.SetLabelFormat("%6.3g")
ax._vtk_axes.SetFlyModeToOuterEdges()
#ax._vtk_axes.SetFontFactor(ax.getp('fontsize')/10.)
ax._vtk_axes.ScalingOff()
ax._vtk_axes.SetAxisTitleTextProperty(tprop)
ax._vtk_axes.SetAxisLabelTextProperty(tprop)
ax._vtk_axes.GetProperty().SetColor(ax.getp('fgcolor'))
ax._vtk_axes.SetCornerOffset(0)
ax._vtk_axes.SetNumberOfLabels(5)
ax._vtk_axes.SetXLabel(ax.getp('xlabel'))
ax._vtk_axes.SetYLabel(ax.getp('ylabel'))
ax._vtk_axes.SetZLabel(ax.getp('zlabel'))
if ax.getp('camera').getp('view') == 2:
ax._vtk_axes.YAxisVisibilityOff()
else:
ax._vtk_axes.YAxisVisibilityOn()
ax._renderer.AddActor(ax._vtk_axes)
ax._vtk_box_bounds = bounds
def _set_box_state(self):
ax = self._axis
if not hasattr(ax, '_vtk_box'):
ax._vtk_box = vtk.vtkActor()
# remove old box (if present):
if ax._renderer.GetActors().IsItemPresent(ax._vtk_box):
ax._renderer.RemoveActor(ax._vtk_box)
if ax.getp('box'):
box = vtk.vtkCubeSource()
#box.SetBounds(ax._vtk_scaled_bounds)
box.SetBounds(ax._vtk_box_bounds)
box.Update()
outline = vtk.vtkOutlineFilter()
outline.SetInput(box.GetOutput())
mapper = vtk.vtkPolyDataMapper()
mapper.SetInput(outline.GetOutput())
ax._vtk_box.SetMapper(mapper)
ax._vtk_box.GetProperty().SetColor(ax.getp('fgcolor'))
ax._renderer.AddActor(ax._vtk_box)
def _set_colormap(self):
colormap = self._axis.getp('colormap')
if not isinstance(colormap, vtk.vtkLookupTable):
colormap = self.jet() # use default colormap
self._axis._vtk_colormap = colormap
def _set_colorbar(self):
ax = self._axis
cbar = ax.getp('colorbar')
if not hasattr(ax, '_vtk_colorbar'):
ax._vtk_colorbar = vtk.vtkScalarBarActor()
if ax._renderer.GetActors().IsItemPresent(ax._vtk_colorbar):
ax._renderer.RemoveActor2D(ax._vtk_colorbar)
if cbar.getp('visible'):
cblocation = cbar.getp('cblocation')
cbloc = self._colorbar_locations[cblocation]
ax._vtk_colorbar.SetLookupTable(ax._vtk_colormap)
if 'North' in cblocation or 'South' in cblocation:
ax._vtk_colorbar.SetOrientationToHorizontal()
else:
ax._vtk_colorbar.SetOrientationToVertical()
ax._vtk_colorbar.SetTitle(cbar.getp('cbtitle'))
ax._vtk_colorbar.SetPosition(*cbloc[0])
ax._vtk_colorbar.SetPosition2(*cbloc[1])
tprop = vtk.vtkTextProperty()
tprop.SetColor(ax.getp('fgcolor'))
tprop.SetFontSize(ax.getp('fontsize'))
tprop.ShadowOff()
ax._vtk_colorbar.SetTitleTextProperty(tprop)
ax._vtk_colorbar.SetLabelTextProperty(tprop)
ax._renderer.AddActor(ax._vtk_colorbar)
def _set_shading(self, item, source, actor):
shading = self._axis.getp('shading')
if shading == 'interp':
actor.GetProperty().SetInterpolationToGouraud()
elif shading == 'flat':
actor.GetProperty().SetInterpolationToFlat()
else: # use default shading ('faceted')
actor.GetProperty().SetInterpolationToFlat()
edges = vtk.vtkExtractEdges()
edges.SetInput(source.GetOutput())
edges.Update()
mapper = vtk.vtkPolyDataMapper()
mapper.SetInput(edges.GetOutput())
mapper.ScalarVisibilityOff()
mapper.SetResolveCoincidentTopologyToPolygonOffset()
mesh = vtk.vtkActor()
mesh.SetMapper(mapper)
color = item.getp('linecolor')
if color == '' or color is None:
color = (0,0,0) # use black as default
elif not isinstance(color, (tuple,list)):
try: color = self._colors[color]
except: color = (0,0,0) # use black as default
mesh.GetProperty().SetColor(color)
self._axis._renderer.AddActor(mesh)
def _set_title(self):
tprop = vtk.vtkTextProperty()
tprop.BoldOff()
tprop.SetFontSize(self._axis.getp('fontsize'))
tprop.SetColor(self._axis.getp('fgcolor'))
tprop.SetFontFamilyToArial()
tprop.SetVerticalJustificationToTop()
tprop.SetJustificationToCentered()
mapper = vtk.vtkTextMapper()
mapper.SetInput(self._fix_latex(self._axis.getp('title')))
mapper.SetTextProperty(tprop)
actor = vtk.vtkActor2D()
actor.SetMapper(mapper)
actor.GetPositionCoordinate().SetCoordinateSystemToView()
actor.GetPositionCoordinate().SetValue(0.0, 0.95)
self._axis._renderer.AddActor(actor)
def _set_caxis(self):
if self._axis.getp('caxismode') == 'auto':
caxis = None
else:
caxis = self._axis.getp('caxis')
self._axis._vtk_caxis = caxis
def _data_inside_bounds(self, data):
fb = self._axis._vtk_scaled_bounds
bounds = data.GetBounds()
for i in range(0, len(fb), 2):
if bounds[i] < fb[i] and not allclose(bounds[i],fb[i]):
return False
for i in range(1, len(fb), 2):
if bounds[i] > fb[i] and not allclose(bounds[i],fb[i]):
return False
return True
def _cut_data(self, indata):
if self._data_inside_bounds(indata.GetOutput()):
return indata
box = vtk.vtkBox()
box.SetBounds(self._axis._vtk_scaled_bounds)
clipper = vtk.vtkClipPolyData()
clipper.SetInput(indata.GetOutput())
clipper.SetClipFunction(box)
#clipper.GenerateClipScalarsOn()
#clipper.GenerateClippedOutputOn()
clipper.SetValue(0.0)
clipper.InsideOutOn()
clipper.Update()
return clipper
def _add_slices(self, item, sgrid, contours=False):
cvector = item.getp('cvector')
center = sgrid.GetCenter()
dar = self._axis.getp('daspect')
sx, sy, sz = item.getp('slices')
if len(shape(sx)) == 2 and shape(sx) == shape(sy) == shape(sz):
s = Surface(sx,sy,sz)
sgrid2 = self._get_2d_structured_grid(s)
plane = vtk.vtkStructuredGridGeometryFilter()
plane.SetInput(sgrid2)
plane.Update()
data = self._cut_data(plane)
implds = vtk.vtkImplicitDataSet()
implds.SetDataSet(data.GetOutput())
implds.Modified()
cut = vtk.vtkCutter()
cut.SetInput(sgrid)
cut.SetCutFunction(implds)
cut.GenerateValues(10, -2,2)
cut.GenerateCutScalarsOn()
cut.Update()
mapper = vtk.vtkPolyDataMapper()
mapper.SetInput(cut.GetOutput())
mapper.SetLookupTable(self._axis._vtk_colormap)
caxis = self._axis.getp('caxis')
if None in caxis:
caxis = data.GetOutput().GetScalarRange()
mapper.SetScalarRange(caxis)
mapper.Update()
actor = vtk.vtkActor()
actor.SetMapper(mapper)
self._set_shading(item, data, actor)
self._set_actor_properties(item, actor)
self._axis._renderer.AddActor(actor)
self._axis._vtk_apd.AddInput(cut.GetOutput())
self._axis._vtk_apd.AddInput(data.GetOutput())
else:
origins = []
normals = []
sx = ravel(sx)/dar[0]
sy = ravel(sy)/dar[1]
sz = ravel(sz)/dar[2]
for i in range(len(sx)):
normals.append([1,0,0])
origins.append([sx[i], center[1], center[2]])
for i in range(len(sy)):
normals.append([0,1,0])
origins.append([center[0], sy[i], center[2]])
for i in range(len(sz)):
normals.append([0,0,1])
origins.append([center[0], center[1], sz[i]])
for i in range(len(normals)):
plane = vtk.vtkPlane()
plane.SetOrigin(origins[i])
plane.SetNormal(normals[i])
cut = vtk.vtkCutter()
cut.SetInput(sgrid)
cut.SetCutFunction(plane)
cut.Update()
data = self._cut_data(cut)
mapper = vtk.vtkPolyDataMapper()
if contours:
iso = vtk.vtkContourFilter()
iso.SetInput(data.GetOutput())
if cvector is not None:
for i in range(len(cvector)):
iso.SetValue(i, cvector[i])
else:
zmin, zmax = data.GetOutput().GetScalarRange()
iso.GenerateValues(item.getp('clevels'), zmin, zmax)
iso.Update()
mapper.SetInput(iso.GetOutput())
else:
mapper.SetInput(data.GetOutput())
mapper.SetLookupTable(self._axis._vtk_colormap)
caxis = self._axis.getp('caxis')
if None in caxis:
caxis = sgrid.GetScalarRange()
mapper.SetScalarRange(caxis)
mapper.Update()
actor = vtk.vtkActor()
actor.SetMapper(mapper)
if not contours:
self._set_shading(item, data, actor)
self._set_actor_properties(item, actor)
self._axis._renderer.AddActor(actor)
self._axis._vtk_apd.AddInput(cut.GetOutput())
def _add_isosurface(self, item, sgrid):
iso = vtk.vtkContourFilter()
iso.SetInput(sgrid)
iso.SetValue(0, item.getp('isovalue'))
iso.Update()
data = self._cut_data(iso)
normals = vtk.vtkPolyDataNormals()
normals.SetInput(data.GetOutput())
normals.SetFeatureAngle(45)
normals.Update()
mapper = vtk.vtkPolyDataMapper()
mapper.SetInput(normals.GetOutput())
mapper.SetLookupTable(self._axis._vtk_colormap)
caxis = self._axis.getp('caxis')
if None in caxis:
caxis = sgrid.GetScalarRange()
mapper.SetScalarRange(caxis)
mapper.Update()
actor = vtk.vtkActor()
actor.SetMapper(mapper)
self._set_shading(item, data, actor)
self._set_actor_properties(item, actor)
self._axis._renderer.AddActor(actor)
self._axis._vtk_apd.AddInput(normals.GetOutput())
def _get_2d_structured_grid(self, item, vectors=False,
heights=True, bottom=False):
indexing = item.getp('indexing')
dar = self._axis.getp('daspect')
x = asarray(item.getp('xdata'))/dar[0]
y = asarray(item.getp('ydata'))/dar[1]
sgrid = vtk.vtkStructuredGrid()
sgrid.SetDimensions(item.getp('dims'))
no_points = item.getp('numberofpoints')
points = vtk.vtkPoints()
points.SetNumberOfPoints(no_points)
if vectors:
if hasattr(item, 'scale_vectors'):
item.scale_vectors()
x = ravel(x)
y = ravel(y)
u = asarray(item.getp('udata'))
v = ravel(item.getp('vdata'))
w = item.getp('wdata')
z = item.getp('zdata')
if z is None and w is None:
z = w = zeros(shape(u))
z = ravel(z)
w = ravel(w)
if item.getp('function') == 'quiver3':
z = z/dar[2]
if rank(u) == 2:
nx, ny = shape(u)
if indexing == 'ij':
if len(x) == nx:
x = ravel(x[:,newaxis]*ones((nx,ny)))
if len(y) == ny:
y = ravel(y[newaxis,:]*ones((nx,ny)))
else:
if len(x) == ny:
x = ravel(x[newaxis,:]*ones((nx,ny)))
if len(y) == nx:
y = ravel(y[:,newaxis]*ones((nx,ny)))
u = ravel(u)
vectors = vtk.vtkFloatArray()
vectors.SetNumberOfTuples(no_points)
vectors.SetNumberOfComponents(3)
vectors.SetNumberOfValues(3*no_points)
assert shape(x)==shape(y)==shape(z)==shape(u)==shape(v)==shape(w),\
"matrix dimensions must agree"
for i in range(no_points):
points.SetPoint(i, x[i], y[i], z[i])
vectors.SetTuple3(i, u[i], v[i], w[i])
points.Modified()
sgrid.SetPoints(points)
sgrid.GetPointData().SetVectors(vectors)
else:
values = asarray(item.getp('zdata'))
if heights:
z = values/dar[2]
elif bottom:
z = zeros(values.shape, NumPy_dtype(values)) + \
self._axis._vtk_scaled_bounds[4]
else:
z = zeros(values.shape, NumPy_dtype(values))
try:
cdata = asarray(item.getp('cdata'))
except KeyError:
pass
else:
if cdata is not None and cdata.shape == values.shape:
values = cdata
scalars = vtk.vtkFloatArray()
scalars.SetNumberOfTuples(no_points)
scalars.SetNumberOfComponents(1)
nx, ny = shape(values)
if not (shape(x) == shape(y) == (nx,ny)):
x, y = meshgrid(ravel(x), ravel(y),
sparse=False, indexing=indexing)
assert shape(x) == shape(y) == shape(z), \
"array dimensions must agree"
ind = 0
for j in range(ny):
for i in range(nx):
points.SetPoint(ind, x[i,j], y[i,j], z[i,j])
scalars.SetValue(ind, values[i,j])
ind += 1
points.Modified()
sgrid.SetPoints(points)
sgrid.GetPointData().SetScalars(scalars)
sgrid.Update()
return sgrid
def _get_3d_structured_grid(self, item, vectors=False):
indexing = item.getp('indexing')
dar = self._axis.getp('daspect')
x = asarray(item.getp('xdata'))/dar[0]
y = asarray(item.getp('ydata'))/dar[1]
z = asarray(item.getp('zdata'))/dar[2]
sgrid = vtk.vtkStructuredGrid()
sgrid.SetDimensions(item.getp('dims'))
no_points = item.getp('numberofpoints')
points = vtk.vtkPoints()
points.SetNumberOfPoints(no_points)
if vectors:
u = asarray(item.getp('udata'))
v = asarray(item.getp('vdata'))
w = asarray(item.getp('wdata'))
nx, ny, nz = shape(u)
if not (shape(x) == shape(y) == shape(z)):
x, y, z = meshgrid(ravel(x), ravel(y), ravel(z),
sparse=False, indexing=indexing)
assert shape(x) == shape(y) == shape(z) == \
shape(u) == shape(v) == shape(w), \
"array dimensions must agree"
vectors = vtk.vtkFloatArray()
vectors.SetNumberOfTuples(no_points)
vectors.SetNumberOfComponents(3)
vectors.SetNumberOfValues(3*no_points)
ind = 0
for k in range(nz):
for j in range(ny):
for i in range(nx):
points.SetPoint(ind, x[i,j,k], y[i,j,k], z[i,j,k])
vectors.SetTuple3(ind, u[i,j,k], v[i,j,k], w[i,j,k])
ind += 1
points.Modified()
sgrid.SetPoints(points)
sgrid.GetPointData().SetVectors(vectors)
else:
scalars = vtk.vtkFloatArray()
scalars.SetNumberOfTuples(no_points)
scalars.SetNumberOfComponents(1)
v = asarray(item.getp('vdata'))
# TODO: what about pseudocolor data?
#cdata = ravel(item.getp('cdata'))
#if cdata is not None:
# v = cdata
nx, ny, nz = shape(v)
if not (shape(x) == shape(y) == shape(z) == (nx,ny,nz)):
x, y, z = meshgrid(ravel(x), ravel(y), ravel(z),
sparse=False, indexing=indexing)
assert shape(x) == shape(y) == shape(z) == shape(v), \
"array dimensions must agree"
ind = 0
for k in range(nz):
for j in range(ny):
for i in range(nx):
points.SetPoint(ind, x[i,j,k], y[i,j,k], z[i,j,k])
scalars.SetValue(ind, v[i,j,k])
ind += 1
points.Modified()
sgrid.SetPoints(points)
sgrid.GetPointData().SetScalars(scalars)
sgrid.Update()
return sgrid
def _add_surface(self, item, sgrid):
plane = vtk.vtkStructuredGridGeometryFilter()
plane.SetInput(sgrid)
plane.Update()
data = self._cut_data(plane)
normals = vtk.vtkPolyDataNormals()
normals.SetInput(data.GetOutput())
normals.SetFeatureAngle(45)
normals.Update()
mapper = vtk.vtkDataSetMapper()
mapper.SetInput(normals.GetOutput())
mapper.SetLookupTable(self._axis._vtk_colormap)
caxis = self._axis.getp('caxis')
if None in caxis:
caxis = data.GetOutput().GetScalarRange()
mapper.SetScalarRange(caxis)
mapper.Update()
actor = vtk.vtkActor()
actor.SetMapper(mapper)
if item.getp('wireframe'):
actor.GetProperty().SetRepresentationToWireframe()
else:
self._set_shading(item, data, actor)
self._set_actor_properties(item, actor)
self._add_legend(item, normals.GetOutput())
self._axis._renderer.AddActor(actor)
self._axis._vtk_apd.AddInput(normals.GetOutput())
def _add_contours(self, item, sgrid):
plane = vtk.vtkStructuredGridGeometryFilter()
plane.SetInput(sgrid)
plane.Update()
data = self._cut_data(plane)
filled = item.getp('filled')
if filled:
iso = vtk.vtkBandedPolyDataContourFilter()
iso.SetScalarModeToValue()
iso.GenerateContourEdgesOn()
else:
iso = vtk.vtkContourFilter()
iso.SetInput(data.GetOutput())
clevels = item.getp('clevels')
cvector = item.getp('cvector')
if cvector is not None:
for i in range(clevels):
iso.SetValue(i, cvector[i])
else:
zmin, zmax = data.GetOutput().GetScalarRange()
iso.SetNumberOfContours(clevels)
iso.GenerateValues(clevels, zmin, zmax)
iso.Update()
isoMapper = vtk.vtkPolyDataMapper()
isoMapper.SetInput(iso.GetOutput())
isoMapper.SetLookupTable(self._axis._vtk_colormap)
caxis = self._axis.getp('caxis')
if None in caxis:
caxis = data.GetOutput().GetScalarRange()
isoMapper.SetScalarRange(caxis)
if item.getp('linecolor'): # linecolor is defined:
isoMapper.ScalarVisibilityOff()
isoMapper.Update()
isoActor = vtk.vtkActor()
isoActor.SetMapper(isoMapper)
self._set_actor_properties(item, isoActor)
self._add_legend(item, iso.GetOutput())
self._axis._renderer.AddActor(isoActor)
self._axis._vtk_apd.AddInput(data.GetOutput())
if filled: # create contour edges:
edgeMapper = vtk.vtkPolyDataMapper()
edgeMapper.SetInput(iso.GetContourEdgesOutput())
edgeMapper.SetResolveCoincidentTopologyToPolygonOffset()
edgeActor = vtk.vtkActor()
edgeActor.SetMapper(edgeMapper)
edgeActor.GetProperty().SetColor(0, 0, 0)
self._axis._renderer.AddActor(edgeActor)
if item.getp('clabels'):
# subsample the points and label them:
mask = vtk.vtkMaskPoints()
mask.SetInput(iso.GetOutput())
mask.SetOnRatio(data.GetOutput().GetNumberOfPoints()/50)
mask.SetMaximumNumberOfPoints(50)
mask.RandomModeOn()
# Create labels for points - only show visible points
visPts = vtk.vtkSelectVisiblePoints()
visPts.SetInput(mask.GetOutput())
visPts.SetRenderer(self._axis._renderer)
ldm = vtk.vtkLabeledDataMapper()
ldm.SetInput(mask.GetOutput())
ldm.SetLabelFormat("%.1g")
ldm.SetLabelModeToLabelScalars()
tprop = ldm.GetLabelTextProperty()
tprop.SetFontFamilyToArial()
tprop.SetFontSize(10)
tprop.SetColor(0,0,0)
tprop.ShadowOff()
tprop.BoldOff()
contourLabels = vtk.vtkActor2D()
contourLabels.SetMapper(ldm)
self._axis._renderer.AddActor(contourLabels)
def _add_velocity_vectors(self, item, sgrid):
marker, rotation = self._arrow_types[item.getp('linemarker')]
arrow = vtk.vtkGlyphSource2D()
arrow.SetGlyphType(marker)
arrow.SetFilled(item.getp('filledarrows'))
arrow.SetRotationAngle(rotation)
if arrow.GetGlyphType() != 9: # not an arrow
arrow.DashOn()
arrow.SetCenter(.75,0,0)
else:
arrow.SetCenter(.5,0,0)
arrow.SetColor(self._colors[item.getp('linecolor')])
plane = vtk.vtkStructuredGridGeometryFilter()
plane.SetInput(sgrid)
plane.Update()
data = self._cut_data(plane)
glyph = vtk.vtkGlyph3D()
glyph.SetInput(data.GetOutput())
glyph.SetSource(arrow.GetOutput())
glyph.SetColorModeToColorByVector()
glyph.SetRange(data.GetOutput().GetScalarRange())
glyph.ScalingOn()
glyph.SetScaleModeToScaleByVector()
glyph.OrientOn()
glyph.SetVectorModeToUseVector()
glyph.Update()
mapper = vtk.vtkPolyDataMapper()
mapper.SetInput(glyph.GetOutput())
#vr = data.GetOutput().GetPointData().GetVectors().GetRange()
#mapper.SetScalarRange(vr)
mapper.ScalarVisibilityOff()
mapper.Update()
actor = vtk.vtkActor()
actor.SetMapper(mapper)
self._set_actor_properties(item, actor)
self._add_legend(item, arrow.GetOutput())
self._axis._renderer.AddActor(actor)
self._axis._vtk_apd.AddInput(glyph.GetOutput())
def _add_streams(self, item, sgrid):
length = sgrid.GetLength()
max_velocity = sgrid.GetPointData().GetVectors().GetMaxNorm()
max_time = 35.0*length/max_velocity
n = item.getp('numberofstreams')
sx = ravel(item.getp('startx'))
sy = ravel(item.getp('starty'))
sz = None
if item.getp('startz') is not None:
sz = ravel(item.getp('startz'))
dar = self._axis.getp('daspect')
for i in range(n):
integ = vtk.vtkRungeKutta2() # or 4?
stream = vtk.vtkStreamLine()
stream.SetInput(sgrid)
stream.SetStepLength(item.getp('stepsize'))
#stream.SetIntegrationStepLength(item.getp('stepsize'))
#stream.SetIntegrationDirectionToIntegrateBothDirections()
stream.SetIntegrationDirectionToForward()
#stream.SetMaximumPropagationTime(max_time)
#stream.SetMaximumPropagationTime(200)
stream.SpeedScalarsOn()
#stream.VorticityOn()
if sz is None:
stream.SetStartPosition(sx[i]/dar[0], sy[i]/dar[1], 0)
else:
stream.SetStartPosition(sx[i]/dar[0],
sy[i]/dar[1],
sz[i]/dar[2])
stream.SetIntegrator(integ)
stream.Update()
data = self._cut_data(stream)
if item.getp('ribbons'):
streamribbon = vtk.vtkRibbonFilter()
streamribbon.SetInput(data.GetOutput())
streamribbon.VaryWidthOn()
streamribbon.SetWidthFactor(item.getp('ribbonwidth'))
#streamribbon.SetAngle(90)
streamribbon.SetDefaultNormal([0,1,0])
streamribbon.UseDefaultNormalOn()
streamribbon.Update()
output = streamribbon.GetOutput()
elif item.getp('tubes'):
streamtube = vtk.vtkTubeFilter()
streamtube.SetInput(data.GetOutput())
streamtube.SetRadius(1)
streamtube.SetNumberOfSides(item.getp('n'))
streamtube.SetVaryRadiusToVaryRadiusByVector()
streamtube.Update()
output = streamtube.GetOutput()
else:
output = data.GetOutput()
mapper = vtk.vtkPolyDataMapper()
mapper.SetInput(output)
mapper.SetLookupTable(self._axis._vtk_colormap)
caxis = self._axis.getp('caxis')
if None in caxis:
caxis = output.GetBounds()[4:]
#caxis = sgrid.GetScalarRange()
mapper.SetScalarRange(caxis)
mapper.Update()
actor = vtk.vtkActor()
actor.SetMapper(mapper)
#self._set_shading(item, stream, actor)
self._set_actor_properties(item, actor)
self._add_legend(item, output)
self._axis._renderer.AddActor(actor)
self._axis._vtk_apd.AddInput(output)
def _add_line(self, item):
dar = self._axis.getp('daspect')
n = item.getp('numberofpoints')
polydata = vtk.vtkPolyData()
polydata.SetLines(vtk.vtkCellArray())
points = vtk.vtkPoints()
#points.SetNumberOfPoints(n)
x = ravel(item.getp('xdata'))/dar[0]
y = ravel(item.getp('ydata'))/dar[1]
z = item.getp('zdata')
if z is not None:
z = ravel(z)/dar[2]
else:
z = zeros(n, NumPy_dtype(x))
ids = vtk.vtkIdList()
for i in range(1,n):
points.InsertNextPoint(x[i-1], y[i-1], z[i-1])
ids.InsertNextId(i-1)
ids.InsertNextId(i)
polydata.InsertNextCell(3, ids)
points.InsertNextPoint(x[n-1], y[n-1], z[n-1]) # last point
polydata.SetPoints(points)
polydata.Update()
mapper = vtk.vtkPolyDataMapper()
mapper.SetInput(polydata)
actor = vtk.vtkActor()
actor.SetMapper(mapper)
self._set_actor_properties(item, actor)
self._add_legend(item, polydata)
self._axis._renderer.AddActor(actor)
self._axis._vtk_apd.AddInput(polydata)
def _set_actor_properties(self, item, actor):
# set line properties:
color = item.getp('linecolor')
if not isinstance(color, (tuple,list)):
try: color = self._colors[color]
except: color = (0,0,1) # use blue as default
actor.GetProperty().SetColor(color)
if item.getp('linetype') == '--':
actor.GetProperty().SetLineStipplePattern(65280)
elif item.getp('linetype') == ':':
actor.GetProperty().SetLineStipplePattern(0x1111)
actor.GetProperty().SetLineStippleRepeatFactor(1)
#actor.GetProperty().SetPointSize(item.getp('pointsize'))
linewidth = item.getp('linewidth')
if linewidth:
actor.GetProperty().SetLineWidth(float(linewidth))
# set material properties:
ax = self._axis
mat = item.getp('material')
if mat.getp('opacity') is not None:
actor.GetProperty().SetOpacity(mat.getp('opacity'))
if mat.getp('ambient') is not None:
actor.GetProperty().SetAmbient(mat.getp('ambient'))
if ax.getp('ambientcolor') is not None:
actor.GetProperty().SetAmbientColor(ax.getp('ambientcolor'))
if mat.getp('diffuse') is not None:
actor.GetProperty().SetDiffuse(mat.getp('diffuse'))
if ax.getp('diffusecolor') is not None:
actor.GetProperty().SetDiffuseColor(ax.getp('diffusecolor'))
if mat.getp('specular') is not None:
actor.GetProperty().SetSpecular(mat.getp('specular'))
if mat.getp('specularpower') is not None:
actor.GetProperty().SetSpecularPower(mat.getp('specularpower'))
def _set_grid(self):
if not self._axis.getp('visible') or not self._axis.getp('grid'):
return
b = self._axis._vtk_box_bounds #self._axis._vtk_scaled_bounds
if self._axis.getp('camera').getp('view') == 3:
origins = [[b[0],b[2],b[4]], [b[0],b[3],b[4]], [b[1],b[2],b[4]]]
points1 = [[b[1],b[2],b[4]], [b[0],b[3],b[5]], [b[1],b[2],b[5]]]
points2 = [[b[0],b[3],b[4]], [b[1],b[3],b[4]], [b[1],b[3],b[4]]]
else:
origins = [[b[0],b[2],0]]
points1 = [[b[0],b[3],0]]
points2 = [[b[1],b[2],0]]
for i in range(len(origins)):
plane = vtk.vtkPlaneSource()
plane.SetResolution(4, 4)
plane.SetOrigin(origins[i])
plane.SetPoint1(points1[i])
plane.SetPoint2(points2[i])
plane.Update()
mapper = vtk.vtkPolyDataMapper()
mapper.SetInput(plane.GetOutput())
actor = vtk.vtkActor()
actor.SetMapper(mapper)
actor.GetProperty().SetColor(0,0,0)
actor.GetProperty().SetRepresentationToWireframe()
actor.GetProperty().SetLineStipplePattern(0x1111)
actor.GetProperty().SetLineStippleRepeatFactor(1)
self._axis._renderer.AddActor(actor)
def _create_vtk_data(self):
for item in self._axis.getp('plotitems'):
func = item.getp('function')
if isinstance(item, Line):
self._add_line(item)
elif isinstance(item, Surface):
if func == 'pcolor':
sgrid = self._get_2d_structured_grid(item, heights=False)
else:
sgrid = self._get_2d_structured_grid(item)
self._add_surface(item, sgrid)
citem = item.getp('contours')
if isinstance(citem, Contours):
csgrid = self._get_2d_structured_grid(citem, heights=False,
bottom=True)
self._add_contours(citem, csgrid)
elif isinstance(item, Contours):
if item.getp('clocation') == 'surface':
sgrid = self._get_2d_structured_grid(item)
else:
sgrid = self._get_2d_structured_grid(item, heights=False)
self._add_contours(item, sgrid)
elif isinstance(item, VelocityVectors):
if len(item.getp('udata').shape) == 3:
sgrid = self._get_3d_structured_grid(item, vectors=True)
else:
sgrid = self._get_2d_structured_grid(item, vectors=True)
self._add_velocity_vectors(item, sgrid)
elif isinstance(item, Streams):
if len(item.getp('udata').shape) == 3:
sgrid = self._get_3d_structured_grid(item, vectors=True)
else:
sgrid = self._get_2d_structured_grid(item, vectors=True)
self._add_streams(item, sgrid)
elif isinstance(item, Volume):
sgrid = self._get_3d_structured_grid(item)
contours = func == 'contourslice'
if func in ['slice_', 'contourslice']:
self._add_slices(item, sgrid, contours=contours)
elif func == 'isosurface':
self._add_isosurface(item, sgrid)
else:
raise NotImplementedError('%s not yet implemented' % item)
self._axis._vtk_apd.Update()
def _fix_latex(self, legend):
"""Remove latex syntax a la $, \, {, } etc."""
legend = legend.strip()
# General fix of latex syntax (more readable)
legend = legend.replace('**', '^')
#legend = legend.replace('*', '')
legend = legend.replace('$', '')
legend = legend.replace('{', '')
legend = legend.replace('}', '')
legend = legend.replace('\\', '')
return legend
def _add_legend(self, item, polydata):
legend = self._fix_latex(item.getp('legend'))
if legend:
ax = self._axis
n = ax._vtk_nolegends
ax._vtk_nolegends += 1
ax._vtk_legendbox.SetNumberOfEntries(ax._vtk_nolegends)
ax._vtk_legendbox.SetEntrySymbol(n, polydata)
ax._vtk_legendbox.SetEntryString(n, legend)
color = self._colors[item.getp('linecolor')]
ax._vtk_legendbox.SetEntryColor(n, color)#ax.getp('fgcolor'))
def _set_legends(self):
ax = self._axis
n = ax._vtk_nolegends
if n > 0:
ax._vtk_legendbox.SetNumberOfEntries(n)
#ax._vtk_legendbox.ScalarVisibilityOff()
#ax._vtk_legendbox.BorderOff()
ax._vtk_legendbox.GetPositionCoordinate().SetValue(0.8, 0.2, 0)
ax._vtk_legendbox.GetPosition2Coordinate().SetValue(.2, n*.1, 0)
ax._vtk_legendbox.GetProperty().SetColor(ax.getp('fgcolor'))
ax._renderer.AddActor(ax._vtk_legendbox)
def _set_lights(self):
if not hasattr(self._axis, '_vtk_lights'):
self._axis._vtk_lights = []
else: # remove all lights (if any)
for l in self._axis._vtk_lights:
self._axis._renderer.RemoveLight(l)
self._axis._vtk_lights = []
for l in self._axis.getp('lights'):
light = vtk.vtkLight()
light.SetColor(l.getp('lightcolor'))
light.SetFocalPoint(l.getp('lighttarget'))
light.SetPosition(l.getp('lightpos'))
self._axis._renderer.AddLight(light)
self._axis._vtk_lights.append(light)
def _setup_axis(self):
ax = self._axis
xmin, xmax = ax.getp('xmin'), ax.getp('xmax')
if None in [xmin, xmax]:
xmin, xmax = ax.getp('xlim')
ymin, ymax = ax.getp('ymin'), ax.getp('ymax')
if None in [ymin, ymax]:
ymin, ymax = ax.getp('ylim')
zmin, zmax = ax.getp('zmin'), ax.getp('zmax')
if None in [zmin, zmax]:
zmin, zmax = ax.getp('zlim')
bnds = [xmin, xmax, ymin, ymax, zmin, zmax]
ax._vtk_bounds = bnds[:]
# scale axis:
dar = ax.getp('daspect')
bnds[0] = bnds[0]/dar[0]; bnds[1] = bnds[1]/dar[0]
bnds[2] = bnds[2]/dar[1]; bnds[3] = bnds[3]/dar[1]
bnds[4] = bnds[4]/dar[2]; bnds[5] = bnds[5]/dar[2]
ax._vtk_scaled_bounds = bnds[:]
## fig = self.gcf()
## # clean up:
## if hasattr(ax, '_renderer'):
## self._g.RemoveRenderer(ax._renderer)
## if ax._renderer in fig._renderers:
## fig._renderers.remove(ax._renderer)
## del ax._renderer
## ax._renderer = vtk.vtkRenderer()
## self._g.AddRenderer(ax._renderer)
## # add this new renderer to the current figures list of renderers
## # so we can remove it later (e.g. when using clf()):
## fig._renderers.append(ax._renderer)
if not hasattr(ax, '_renderer'):
ax._renderer = vtk.vtkRenderer()
self._g.AddRenderer(ax._renderer)
# add this new renderer to the current figures list of renderers
# so we can remove it later (e.g. when using clf()):
gcf()._renderers.append(ax._renderer)
if hasattr(ax, '_vtk_legendbox'):
ax._renderer.RemoveActor(ax._vtk_legendbox)
ax._vtk_legendbox = vtk.vtkLegendBoxActor()
ax._vtk_nolegends = 0
ax._vtk_legendbox.SetNumberOfEntries(0)
#ax._renderer.TwoSidedLightingOff()
ax._renderer.SetBackground(ax.getp('bgcolor'))
viewport = ax.getp('viewport')
if not viewport:
viewport = (0,0,1,1)
ax._renderer.SetViewport(viewport)
ax._renderer.RemoveAllViewProps() # clear current scene
#axshape = self.gcf().getp('axshape')
#ax._renderer.SetPixelAspect(axshape[1], axshape[0])
if not hasattr(ax, '_vtk_apd'):
ax._vtk_apd = vtk.vtkAppendPolyData()
else:
ax._vtk_apd.RemoveAllInputs()
def _replot(self):
self._axis = gca() # shortcut for fast access
fig = self.gcf()
if fig.getp('axshape') != fig._axshape:
# remove all current renderers:
for ren in fig._renderers:
self._g.RemoveRenderer(ren)
fig._renderers = []
fig._axshape = fig.getp('axshape')
#if self._master is not None:
# fig._root.withdraw()
if len(self._axis.getp('plotitems')) > 0:
self._setup_axis()
self._set_lights()
self._set_colormap()
self._set_caxis()
self._create_vtk_data()
self._create_labeled_axes()
self._set_view()
self._set_box_state()
self._set_colorbar()
self._set_title()
self._set_legends()
self._set_grid()
# render scene:
self._axis._renderer.Render()
if self.getp('show') and hasattr(fig, '_root'):
fig._root.deiconify() # raise window
fig._root.update()
# render complete scene:
self._g.Render()
[docs] def figure(self, *args, **kwargs):
"""Extension of BaseClass.figure"""
fig = BaseClass.figure(self, *args, **kwargs)
try:
fig._g
except:
try:
fig._g = self._create_Tk_gui()
except Tkinter.TclError:
# can't create gui; only offscreen rendering
fig._g = vtk.vtkRenderWindow()
try:
width, height = fig.getp('size')
except TypeError:
width, height = (640, 480)
if width is None or height is None:
width, height = (640, 480)
fig._g.SetSize(width, height)
fig._g.OffScreenRenderingOn()
fig._renderers = []
fig._axshape = fig.getp('axshape')
self._g = fig._g # link for faster access
#self._g.SetAAFrames(5)
return fig
[docs] def clf(self):
"""Clear current figure."""
fig = self.gcf()
for ren in fig._renderers:
self._g.RemoveRenderer(ren)
fig._renderers = []
if self._master is not None:
fig._root.withdraw() # hide window
del fig._g
BaseClass.clf(self)
[docs] def closefig(self, num):
"""Close figure window with number 'num'."""
if num in self._figs:
curfig = self._attrs['curfig']
self.figure(num) # set figure with 'num' as current figure
self.clf()
del self._figs[num]
self.figure(curfig) # put back the current figure
else:
print 'no such figure with number', num
[docs] def closefigs(self):
"""Close all figure windows."""
keys = self._figs.keys()
for key in keys:
closefig(key)
BaseClass.closefigs(self)
self.figure(self._attrs['curfig'])
[docs] def hardcopy(self, filename="",
quality=100,
progressive=False,
vector_file=True,
landscape=False,
raster3d=False,
compress=False,
**kwargs):
"""The figure can be stored in either a vector PostScript (PS/EPS) or
PDF file using GL2PS or a image file (PNG/PNM/JPEG/TIFF/BMP) using
a corresponding vtkWriter instance. PostScript output can also be
generated using vtkPostScriptWriter if vector_file is set to False.
TeX output is also available, but only the text output will be saved
to the file.
If the given filename has no extension, then EPS output will be used.
Keyword arguments:
quality -- Sets the quality of the resulting image. Affects only
JPEG images. Given as an integer between 0 and 100
where 100 results in the best quality (but also
the largest file). The default is quality=100.
progressive -- Sets whether to use progressive JPEG generation or
not. Defaults to False.
vector_file -- If True (default), the figure will be stored as a
vector file. This is only true if either PS, EPS,
or PDF are choosen as the output file format.
Additional keyword arguments (only in affect if the vector_file
argument is set to True and the file format is either PS, EPS or PDF):
landscape -- Sets whether to use landscape or portrait orientation.
A True value result in landscape orientation. Defaults
to False.
raster3d -- If True, this will write 3D props as raster images
while 2D props are rendered using vector graphic
primitives. Defaults to False.
compress -- Compression when generating PostScript or PDF output.
The default is False (no compression).
"""
if not filename:
raise TypeError("hardcopy: No filename given, cannot save figure.")
self.setp(**kwargs)
basename, ext = os.path.splitext(filename)
if not ext: # no extension given, use .eps
ext = '.eps'
filename += ext
if not self.getp('show'): # don't display to screen
self._g.OffScreenRenderingOn()
replot = kwargs.get('replot', True)
if replot:
self._replot()
color = self.getp('color')
vector_file_formats = {'.ps': 0, '.eps': 1, '.pdf': 2, '.tex': 3}
if vector_file and ext.lower() in vector_file_formats:
exp = vtk.vtkGL2PSExporter()
exp.SetRenderWindow(self._g)
exp.SetFilePrefix(basename)
exp.SetFileFormat(vector_file_formats[ext.lower()])
exp.SetCompress(bool(compress))
exp.SetLandscape(bool(landscape))
exp.SetSortToBSP()
#exp.SetSortToSimple() # less expensive sort algorithm
exp.DrawBackgroundOn()
exp.SetWrite3DPropsAsRasterImage(bool(raster3d))
exp.Write()
else:
image_writers = {
'.tif': vtk.vtkTIFFWriter(),
'.bmp': vtk.vtkBMPWriter(),
'.pnm': vtk.vtkPNMWriter(),
'.png': vtk.vtkPNGWriter(),
'.jpg': vtk.vtkJPEGWriter(),
'.ps': vtk.vtkPostScriptWriter(),
'.eps': vtk.vtkPostScriptWriter(), # no EPS file
}
w2if = vtk.vtkWindowToImageFilter()
w2if.SetInput(self._g)
try:
writer = image_writers[ext.lower()]
except KeyError:
raise TypeError(
"hardcopy: File format '%s' is currently not supported."\
% ext)
try:
writer.SetQuality(int(quality))
writer.SetProgressive(bool(progressive))
except ValueError:
raise ValueError(\
"hardcopy: Integer required for the 'quality' argument.")
except AttributeError:
pass # only vtkJPEGWriter has quality and progressive attrs.
writer.SetFileName(filename)
writer.SetInput(w2if.GetOutput())
writer.Write()
self._g.OffScreenRenderingOff()
hardcopy.__doc__ = BaseClass.hardcopy.__doc__ + hardcopy.__doc__
[docs] def brighten(self, *args):
"""Brighten or darken color map."""
nargs = len(args)
if nargs == 2: # brighten(map,beta)
if not isinstance(args[0], vtk.vtkLookupTable):
raise ValueError("brighten: map must be %s, not %s" % \
(type(vtk.vtkLookupTable), type(args[0])))
lut, beta = args
elif nargs == 1: # brighten(beta)
if not hasattr(self._axis, '_vtk_colormap'):
print "brighten: no colormap set."
return
lut = self._axis._vtk_colormap
beta = args[0]
if not isinstance(beta, (float,int)) or (beta <= -1 or beta >= 1):
raise ValueError("brighten: beta must be between -1 and 1")
# all is OK, change colormap:
hue = lut.GetHueRange()
val = lut.GetValueRange()
# colormaps
[docs] def hsv(self, m=256):
lut = vtk.vtkLookupTable()
lut.SetHueRange(0.0, 1.0)
lut.SetSaturationRange(1.0, 1.0)
lut.SetValueRange(1.0, 1.0)
lut.SetNumberOfColors(m)
lut.Build()
return lut
[docs] def gray(self, m=256):
lut = vtk.vtkLookupTable()
lut.SetHueRange(0.0, 0.0)
lut.SetSaturationRange(0.0, 0.0)
lut.SetValueRange(0.0, 1.0)
lut.SetNumberOfColors(m)
lut.Build()
return lut
[docs] def hot(self, m=256):
lut = vtk.vtkLookupTable()
inc = 0.01175
lut.SetNumberOfColors(256)
i = 0
r = 0.0; g = 0.0; b = 0.0
while r <= 1.:
lut.SetTableValue(i, r, g, b, 1)
r += inc; i += 1
r = 1.
while g <= 1.:
lut.SetTableValue(i, r, g, b, 1)
g += inc; i += 1
g = 1.
while b <= 1:
if i == 256: break
lut.SetTableValue(i, r, g, b, 1)
b += inc; i += 1
lut.Build()
return lut
[docs] def flag(self, m=64):
"""Alternating red, white, blue, and black color map.
- flag(m)
'm' must be a multiple of 4
"""
lut = vtk.vtkLookupTable()
lut.SetNumberOfColors(m)
# the last parameter alpha is set to 1 by default
# in method declaration
for i in range(0,m,4):
lut.SetTableValue(i,1,0,0,1) # red
lut.SetTableValue(1+i,1,1,1,1) # white
lut.SetTableValue(2+i,0,0,1,1) # blue
lut.SetTableValue(3+i,0,0,0,1) # black
lut.Build()
return lut
[docs] def jet(self, m=256):
# blue, cyan, green, yellow, red, black
lut = vtk.vtkLookupTable()
lut.SetNumberOfColors(m)
lut.SetHueRange(0.667,0.0)
lut.Build()
return lut
[docs] def blue_to_yellow(self, m=200):
lut = vtk.vtkLookupTable()
lut.SetNumberOfColors(m)
for i in range(m):
frac = i / float(m / 2.0 - 1.0)
if (frac <= 1):
r = frac
g = r
b = 1
else:
r = 1
g = r
b = 2 - frac
# SetTableValue(indx, red, green, blue, alpha)
lut.SetTableValue(i, r, g, b, 1)
lut.Build()
return lut
[docs] def spring(self, m=256):
lut = vtk.vtkLookupTable()
lut.SetNumberOfColors(m)
lut.SetHueRange(0.0, 0.17)
lut.SetSaturationRange(0.5, 1.0)
lut.SetValueRange(1.0, 1.0)
lut.Build()
return lut
[docs] def summer(self, m=256):
lut = vtk.vtkLookupTable()
lut.SetNumberOfColors(m)
lut.SetHueRange(0.47, 0.17)
lut.SetSaturationRange(1.0, 0.6)
lut.SetValueRange(0.5, 1.0)
lut.Build()
return lut
[docs] def winter(self, m=256):
lut = vtk.vtkLookupTable()
lut.SetNumberOfColors(m)
lut.SetHueRange(0.8, 0.42)
lut.SetSaturationRange(1.0, 1.0)
lut.SetValueRange(0.6, 1.0)
lut.Build()
return lut
[docs] def autumn(self, m=256):
lut = vtk.vtkLookupTable()
lut.SetNumberOfColors(m)
lut.SetHueRange(0.0, 0.15)
lut.SetSaturationRange(1.0, 1.0)
lut.SetValueRange(1.0, 1.0)
lut.Build()
return lut
plt = VtkBackend() # Create backend instance
use(plt, globals()) # Export public namespace of plt to globals()
backend = os.path.splitext(os.path.basename(__file__))[0][:-1]
