bargraph ?

[Stef Mientki]

hello,

did anyone created a bargraph in pyqtgraph ?

thanks,
Stef

[Luke Campagnola]

On Sat, Feb 16, 2013 at 7:02 PM, Stef Mientki <stef.m...@gmail.com> wrote:

hello,

did anyone created a bargraph in pyqtgraph ?

Have a look:

http://bazaar.launchpad.net/~luke-campagnola/pyqtgraph/inp/view/head:/pyqtgraph/graphicsItems/BarGraphItem.py

This will be in the next release.

Luke 

[Stef Mientki]

thanks very much Luke,
that's great news !!

cheers,
Stef

Luke 

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[Diego Garcia]

Will be added 3D bars in the next release too? like matplotlib http://imageshack.us/photo/my-images/831/histogramsample.png/

They are very useful!

Thank you

[Luke Campagnola]

On Fri, Jun 14, 2013 at 3:58 AM, Diego Garcia <koby...@gmail.com> wrote:

Will be added 3D bars in the next release too? like matplotlib http://imageshack.us/photo/my-images/831/histogramsample.png/

Here's a very simple implementation:

from GLMeshItem import GLMeshItem

from ..MeshData import MeshData

import numpy as np

class GLBarGraphItem(GLMeshItem):

    def __init__(self, pos, size):

        """

        pos is (...,3) array of the bar positions (the corner of each bar)

        size is (...,3) array of the sizes of each bar

        """

        nCubes = reduce(lambda a,b: a*b, pos.shape[:-1])

        cubeVerts = np.mgrid[0:2,0:2,0:2].reshape(3,8).transpose().reshape(1,8,3)

        cubeFaces = np.array([

            [0,1,2], [3,2,1],

            [4,5,6], [7,6,5],

            [0,1,4], [5,4,1],

            [2,3,6], [7,6,3],

            [0,2,4], [6,4,2],

            [1,3,5], [7,5,3]]).reshape(1,12,3)

        size = size.reshape((nCubes, 1, 3))

        pos = pos.reshape((nCubes, 1, 3))

        verts = cubeVerts * size + pos

        faces = cubeFaces + (np.arange(nCubes) * 8).reshape(nCubes,1,1)

        md = MeshData(verts.reshape(nCubes*8,3), faces.reshape(nCubes*12,3))

        

        GLMeshItem.__init__(self, meshdata=md, shader='shaded', smooth=False)

It isn't perfect and isn't really good enough to be included in the library, but it's a good starting point to improve on.

Here's an example of how to use it:

# regular grid of starting positions

pos = np.mgrid[0:10, 0:10, 0:1].reshape(3,10,10).transpose(1,2,0)

# fixed widths, random heights

size = np.empty((10,10,3))

size[...,0:2] = 0.4

size[...,2] = np.random.normal(size=(10,10))

bg = gl.GLBarGraphItem(pos, size)

I presume you are already familiar with the OpenGL graphics system in pyqtgraph. If not, look through the GL* examples.

Luke

[Jiri Ch]

Hi Luke,

is there any progress there (plotting 3D bar charts)? Thanks

Jiri

Dne pátek 14. června 2013 15:27:39 UTC+2 Luke Campagnola napsal(a):