Created
February 16, 2011 17:04
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Drawing cylinders
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#cyl_example.py | |
from enthought.tvtk.tools import visual | |
def draw_cyl(coords): | |
x_ax = coords['x1'] -coords['x0'] | |
y_ax = coords['y1'] -coords['y0'] | |
z_ax = coords['z1'] -coords['z0'] | |
cyl = visual.Cylinder(pos=(coords['x0'],coords['y0'],coords['z0']), | |
axis=(x_ax,y_ax,z_ax), radius=1, length=10) | |
return cyl | |
if __name__ =='__main__': | |
cyl_a_coords = {'y1': 0.0, 'y0': 0.0, 'x0': 0.0, 'x1': 30.0, 'z0': 0.0, 'z1': 0.0} | |
cyl_b_coords = {'y1': 0.0, 'y0': 0.0, 'x0': 30.0, 'x1': 630.0, 'z0': 0.0, 'z1': 0.0} | |
cyl_c_coords = {'y1': -77.88, 'y0': 0.0, 'x0': 0.0, 'x1': -184.21, 'z0': 0.0, 'z1': 0.0} | |
cyl_d_coords = {'y1': 389.41, 'y0': 0.0, 'x0': 0.0, 'x1': -921.06, 'z0': 0.0, 'z1': 0.0} | |
cyl_a = {'color': (1.0, 0.0, 0.0), 'coords' : cyl_a_coords} | |
cyl_b = {'color': (1.0, 0.63, 0.04), 'coords' : cyl_b_coords} | |
cyl_c = {'color': (1.0, 0.8, 0.0), 'coords' : cyl_c_coords} | |
cyl_d = {'color': (1.0, 1.0, 0.0), 'coords' : cyl_d_coords} | |
cyls_obj = [] | |
for cyl in [cyl_a, cyl_b, cyl_c, cyl_d]: | |
drawn_cyl = draw_cyl(cyl['coords']) | |
drawn_cyl.color = cyl['color'] | |
cyls_obj.append(drawn_cyl) |
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import numpy as np | |
from enthought.mayavi import mlab | |
from enthought.tvtk.api import tvtk | |
from bisect import bisect_left | |
class CylSelector(object): | |
def __init__(self): | |
self.outline = mlab.outline(line_width=1, color=(1.0, 1.0, 1.0)) | |
self.outline.outline_mode = 'cornered' | |
self.outline.visible = False | |
self.picker = None | |
def select_cylinder(self, cyl): | |
y0 = cyl.center[1] - cyl.height/2. - 0.1 | |
x0 = cyl.center[0] - cyl.radius | |
z0 = cyl.center[2] - cyl.radius | |
y1 = cyl.center[1] + cyl.height/2. + 0.1 | |
x1 = cyl.center[0] + cyl.radius | |
z1 = cyl.center[2] + cyl.radius | |
self.outline.bounds = (x0, x1, y0, y1, z0, z1) | |
self.outline.visible = True | |
def picker_callback(self, picker): | |
""" Picker callback: this get called when on pick events. | |
""" | |
self.outline.visible = False | |
for cyl in cylinders: | |
x_b = [cyl.center[0] - cyl.radius, cyl.center[0] + cyl.radius] | |
z_b = [cyl.center[2] - cyl.radius, cyl.center[2] + cyl.radius] | |
y_b = [cyl.center[1] - cyl.height/2., cyl.center[1] + cyl.height/2.] | |
if bisect_left(x_b, self.picker.pick_position[0]) == 1: | |
if bisect_left(y_b, self.picker.pick_position[1]) == 1: | |
if bisect_left(z_b, self.picker.pick_position[2]) == 1: | |
self.select_cylinder(cyl) | |
break | |
num_cyl = 20 | |
x, y, z, r, h = np.random.normal(size=(5, num_cyl)) | |
h = .1+ np.abs(h) | |
r = .01+ .1*np.abs(r) | |
cylinders = [tvtk.CylinderSource(center=(this_x, this_y, this_z), | |
radius=this_r, | |
height=this_h, | |
) | |
for this_x, this_y, this_z, this_r, this_h | |
in zip(x, y, z, r, h)] | |
combined_source = tvtk.AppendPolyData(input=cylinders[0].output) | |
for cylinder in cylinders: | |
combined_source.add_input(cylinder.output) | |
combination = combined_source.output | |
figure = mlab.figure(1, size=(500, 500)) | |
mlab.clf() | |
# Scalars | |
voltage = np.linspace(-90, 60, num=num_cyl) | |
surf = mlab.pipeline.surface(combination, vmin=voltage.min(), | |
vmax=voltage.max()) | |
combination.point_data.scalars = np.repeat(voltage, 24) # 24 points per cylinder | |
combination.point_data.scalars.name = 'Voltage' | |
# Selector and Picker | |
cyl_sel = CylSelector() | |
cyl_sel.picker = figure.on_mouse_pick(cyl_sel.picker_callback, type='cell') | |
mlab.scalarbar(surf, orientation='vertical') |
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