enh(echarts): Support custom ticklabel formatter

[hoxbro]

Resolves https://github.com/holoviz/panel/issues/7936

This could be generalized to a custom model. Currently, this is hardcoded to this one instance.

Details

import panel as pn
pn.extension("echarts")


code_js = """
(value) => {
   if (value === -180) {
     return '';
   }
   return value + '';
}
"""

w1 = pn.indicators.Gauge(
    name="Roll",
    value=0,
    start_angle=-90,
    end_angle=270,
    bounds=(-180, 180),
    format="{value} Degs",
    colors=[(0.25, "red"), (0.75, "green"), (1, "red")],
    custom_opts={
        "splitNumber": 12,
        "axisLabel": {"formatter": code_js},
    },
)

code_js = """
(value) => {
   if (value === 360) {
     return '';
   }
   return value + '';
}
"""
w2 = pn.indicators.Gauge(
    name="Heading",
    value=0,
    start_angle=90,
    end_angle=-270,
    bounds=(0, 360),
    format="{value} Degs",
    custom_opts={
        "splitNumber": 12,
        "labelLayout": {"hideOverlap": True},
        "axisLabel": {"formatter": code_js},
    },
)


pn.Row(w1, w2).servable()

[codecov[bot]]

Codecov Report

:white_check_mark: All modified and coverable lines are covered by tests. :white_check_mark: Project coverage is 86.09%. Comparing base (dec3707) to head (5f1be8e). :warning: Report is 139 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7940      +/-   ##
==========================================
- Coverage   87.12%   86.09%   -1.03%     
==========================================
  Files         346      346              
  Lines       53225    53225              
==========================================
- Hits        46372    45826     -546     
- Misses       6853     7399     +546     

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[philippjfr]

Superseded by #8162

[github-actions[bot]]

This pull request has been automatically locked since there has not been any recent activity after it was closed. Please open a new issue for related bugs.