91 lines
2.6 KiB
Python
91 lines
2.6 KiB
Python
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#!/usr/bin/env python
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from collections import defaultdict
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import xml.etree.ElementTree as ET
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import six
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from leather.data_types import Text
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from leather.series import CategorySeries
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from leather.shapes.base import Shape
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from leather import theme
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from leather.utils import DummySeries, X, Y
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class Dots(Shape):
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"""
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Render a series of data as dots.
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:param fill_color:
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The color to fill the dots. You may also specify a
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:func:`.style_function`. If not specified, default chart colors will be
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used.
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:param radius:
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The radius of the rendered dots. Defaults to
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:data:`.theme.default_dot_radius`. You may also specify a
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:func:`.style_function`.
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"""
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def __init__(self, fill_color=None, radius=None):
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self._fill_color = fill_color
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self._radius = radius or theme.default_dot_radius
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def validate_series(self, series):
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"""
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Verify this shape can be used to render a given series.
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"""
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if series.data_type(X) is Text or series.data_type(Y) is Text:
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raise ValueError('Dots do not support Text values.')
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return True
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def to_svg(self, width, height, x_scale, y_scale, series, palette):
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"""
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Render dots to SVG elements.
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"""
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group = ET.Element('g')
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group.set('class', 'series dots')
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default_colors = defaultdict(lambda: next(palette))
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for d in series.data():
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if d.x is None or d.y is None:
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continue
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proj_x = x_scale.project(d.x, 0, width)
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proj_y = y_scale.project(d.y, height, 0)
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if callable(self._fill_color):
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fill_color = self._fill_color(d)
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elif self._fill_color:
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fill_color = self._fill_color
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else:
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fill_color = default_colors[d.z]
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if callable(self._radius):
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radius = self._radius(d)
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else:
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radius = self._radius
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group.append(ET.Element('circle',
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cx=six.text_type(proj_x),
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cy=six.text_type(proj_y),
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r=six.text_type(radius),
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fill=fill_color
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))
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return group
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def legend_to_svg(self, series, palette):
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"""
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Render the legend entries for these shapes.
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"""
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items = []
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if isinstance(series, CategorySeries):
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for category in series.categories():
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items.extend(Shape.legend_to_svg(self, DummySeries(category), palette))
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else:
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items.extend(Shape.legend_to_svg(self, series, palette))
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return items
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