mayavi - 以编程方式设置图像的 [x,y,z] 范围 [英] mayavi - setting the [x,y,z] extent of an image programatically

问题描述

我有一些包含多个 2D 图像的数据，我想使用 mayavi2 (v4.3.0) 在相对于彼此的特定 [x,y,z] 位置呈现这些数据.>

从文档看来我应该能够用 mlab.imshow() 做到这一点.不幸的是，当我调用 imshow 并指定 extent 参数(AttributeError: 'ImageActor' object has no attribute 'actor')时，mayavi 会抛出异常.

我也尝试通过修改 im.mlab_source.x,y,z... 直接设置 x、y 和 z 数据.奇怪的是，虽然这正确地改变了 x 和 y 范围，但它对 z 位置没有任何影响，即使 im.mlab_source.z 明显改变.

这是一个可运行的示例:

将 numpy 导入为 np从 scipy.misc 导入 lena从 mayavi 导入 mlabdef normal_imshow(img=lena()):返回 mlab.imshow(img,colormap='gray')def set_extent(img=lena()):return mlab.imshow(img,extent=[0,100,0,100,50,50],colormap='cool')def set_xyz(img=lena()):im = mlab.imshow(img,colormap='hot')src = im.mlab_source打印 '旧 z :',src.zsrc.x = 100*(src.x - src.x.min())/(src.x.max() - src.x.min())src.y = 100*(src.y - src.y.min())/(src.x.max() - src.y.min())src.z[:] = 50打印 'New z :',src.z返回我如果 __name__ == '__main__':# 这有效normal_imshow()# # 这失败(AttributeError)# set_extent()# 奇怪的是，这似乎适用于 x 和 y 轴，但不会改变# 即使 data.z 确实改变了 z 位置set_xyz()

解决方案

好吧，原来这是一个已知错误 在 mayavi 中.但是，可以在创建后更改 ImageActor 对象的方向、位置和比例:

obj = mlab.imshow(img)obj.actor.orientation = [0, 0, 0] # 需要的方向obj.actor.position = [0, 0, 0] # 需要的位置obj.actor.scale = [0, 0, 0] # 需要的比例

I have some data that consists of several 2D images that I would like to render in specific [x,y,z] positions relative to one another using mayavi2 (v4.3.0).

From the documentation it seems that I should just be able to do this with mlab.imshow(). Unfortunately, mayavi throws an exception when I call imshow specifying the extent parameter (AttributeError: 'ImageActor' object has no attribute 'actor').

I also tried setting the x,y and z data directly by modifying im.mlab_source.x,y,z.... Weirdly, whilst this correctly changes the x and y extents, it does nothing to the z-position even though im.mlab_source.z clearly changes.

Here's a runnable example:

import numpy as np
from scipy.misc import lena
from mayavi import mlab

def normal_imshow(img=lena()):
    return mlab.imshow(img,colormap='gray') 

def set_extent(img=lena()):
    return mlab.imshow(img,extent=[0,100,0,100,50,50],colormap='cool')

def set_xyz(img=lena()):
    im = mlab.imshow(img,colormap='hot')    
    src = im.mlab_source
    print 'Old z :',src.z
    src.x = 100*(src.x - src.x.min())/(src.x.max() - src.x.min())
    src.y = 100*(src.y - src.y.min())/(src.x.max() - src.y.min())
    src.z[:] = 50
    print 'New z :',src.z
    return im

if __name__ == '__main__':

    # this works
    normal_imshow()

    # # this fails (AttributeError)
    # set_extent()

    # weirdly, this seems to work for the x and y axes, but does not change
    # the z-postion even though data.z does change
    set_xyz()

解决方案

Ok, it turns out that this is a known bug in mayavi. However, it is possible to change the orientation, position and scale of an ImageActor object after it has been created:

obj = mlab.imshow(img)
obj.actor.orientation = [0, 0, 0]  # the required orientation 
obj.actor.position = [0, 0, 0]     # the required  position 
obj.actor.scale = [0, 0, 0]        # the required scale

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