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allow colorbar ticks at arbitrary position #113

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Merged
Conengmo merged 1 commit into from
Nov 4, 2022
Merged

allow colorbar ticks at arbitrary position #113

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20 changes: 13 additions & 7 deletions branca/colormap.py
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Original file line number Diff line number Diff line change
Expand Up @@ -84,13 +84,15 @@ def __init__(self, vmin=0., vmax=1., caption='', max_labels=10):
self.caption = caption
self.index = [vmin, vmax]
self.max_labels = max_labels
self.tick_labels = None

def render(self, **kwargs):
"""Renders the HTML representation of the element."""
self.color_domain = [self.vmin + (self.vmax-self.vmin) * k/499. for
k in range(500)]
self.color_range = [self.__call__(x) for x in self.color_domain]
self.tick_labels = legend_scaler(self.index, self.max_labels)
if self.tick_labels is None:
self.tick_labels = legend_scaler(self.index, self.max_labels)

super(ColorMap, self).render(**kwargs)

Expand Down Expand Up @@ -185,11 +187,13 @@ class LinearColormap(ColorMap):
The maximal value for the colormap.
Values higher than `vmax` will be bound directly to `colors[-1]`.
max_labels : int, default 10
Maximum number of legend tick labels"""

def __init__(self, colors, index=None, vmin=0., vmax=1., caption='', max_labels=10):
Maximum number of legend tick labels
tick_labels: list of floats, default None
If given, used as the positions of ticks."""
def __init__(self, colors, index=None, vmin=0., vmax=1., caption='', max_labels=10, tick_labels=None):
super(LinearColormap, self).__init__(vmin=vmin, vmax=vmax,
caption=caption, max_labels=max_labels)
self.tick_labels = tick_labels

n = len(colors)
if n < 2:
Expand Down Expand Up @@ -332,7 +336,7 @@ def to_step(self, n=None, index=None, data=None, method=None,
caption = self.caption

return StepColormap(colors, index=index, vmin=index[0], vmax=index[-1], caption=caption,
max_labels=max_labels)
max_labels=max_labels, tick_labels=self.tick_labels)

def scale(self, vmin=0., vmax=1., max_labels=10):
"""Transforms the colorscale so that the minimal and maximal values
Expand Down Expand Up @@ -375,11 +379,13 @@ class StepColormap(ColorMap):
Values higher than `vmax` will be bound directly to `colors[-1]`.
max_labels : int, default 10
Maximum number of legend tick labels

tick_labels: list of floats, default None
If given, used as the positions of ticks.
"""
def __init__(self, colors, index=None, vmin=0., vmax=1., caption='', max_labels=10):
def __init__(self, colors, index=None, vmin=0., vmax=1., caption='', max_labels=10, tick_labels=None):
super(StepColormap, self).__init__(vmin=vmin, vmax=vmax,
caption=caption, max_labels=max_labels)
self.tick_labels = tick_labels

n = len(colors)
if n < 1:
Expand Down