Heatmap does not show any colors if reverse=True

[JoergVanAken]

Describe the bug
A heatmap does not show any values if reverse is set to True

To Reproduce
The following code:

fig = plt.figure()
h = plt.heatmap(np.array([[1, 2], [3, 4]]), y=[0, 1])
plt.show()

shows up a heatmap. But after setting

h.scales['x'].reverse=True

the axis is reversed but all colors disappear, (changing y has the same effect)

Expected behavior
The colur should not disappear.

Environment (please complete the following information):

• Operating System and Version: Windows 10
• Browser: Chrome

[martinRenou]

Thanks a lot for filling this issue, I'm looking into this

[SergioLoaiza]

Describe the bug
The bug seems to be more general. I experienced the same bug creating a simple bar graph; the bars disappeared if reverse is set to True at a LinearScale.

To Reproduce

from bqplot import OrdinalScale, Bars, LinearScale

quintes = np.array(
    ["0 - 4", "5 - 9", "10 - 14", "15 - 19", "20 - 24", "25 - 29", "30 - 34", "35 - 39",
     "40 - 44", "45 - 49", "50 - 54", "55 - 59", "60 - 64", "65 - 69", "70 - 74",
     "75 - 79", "80 - 84", "85 - 89", "90 - 94", "95 - 99", "> 100"])

men = np.array(
    [1915887, 2100931, 2494484, 2464805, 2361297, 2529633, 2669927, 2754129, 2753282,
     2552531, 2211649, 1697221, 1311024, 902675, 722246, 482686, 273915, 108639, 35867,
     10965, 1238])

x_ord = OrdinalScale()
y_linear = LinearScale()

bars = Bars(x=quintes, y=men,
           scales={'x':x_ord, 'y': y_linear},
           orientation="horizontal",
           colors=["deepskyblue"]
           )

# bars.scales['y'].reverse=True

ax_x = Axis(scale=x_ord, orientation = 'vertical', visible=False)

ax_y = Axis(scale=y_linear, tick_format="0.0f")

fig = Figure(marks=[bars], axes=[ax_x, ax_y])

fig

The bars graph is displayed. However, after uncommenting this line in the code:

bars.scales['y'].reverse=True

the bars disappear even though the axes is effectively reversed.

Expected behavior
The bars should be displayed in the same way of the axes, that is, from right to left.

Environment (please complete the following information):
Ubuntu 21.04
Python 3.9.5
JupyterLab 3.2.4
bqplot 0.12.32

[martinRenou]

Thanks for commenting, would you like to open a new issue for that specifically?

[SergioLoaiza]

Thank you for your advice. I published it again in this new issue #1483