79 lines
2.2 KiB
Python
79 lines
2.2 KiB
Python
|
#!/usr/bin/env python
|
||
|
|
|
||
|
|
import xml.etree.ElementTree as ET
|
||
|
|
|
||
|
|
import six
|
||
|
|
|
||
|
|
from leather.data_types import Number, Text
|
||
|
|
from leather.series import CategorySeries
|
||
|
|
from leather.shapes.base import Shape
|
||
|
|
from leather.utils import X, Y
|
||
|
|
|
||
|
|
|
||
|
|
class Columns(Shape):
|
||
|
|
"""
|
||
|
|
Render a series of data as columns.
|
||
|
|
|
||
|
|
:param fill_color:
|
||
|
|
The color to fill the columns. You may also specify a
|
||
|
|
:func:`.style_function`.
|
||
|
|
"""
|
||
|
|
def __init__(self, fill_color=None):
|
||
|
|
self._fill_color = fill_color
|
||
|
|
|
||
|
|
def validate_series(self, series):
|
||
|
|
"""
|
||
|
|
Verify this shape can be used to render a given series.
|
||
|
|
"""
|
||
|
|
if isinstance(series, CategorySeries):
|
||
|
|
raise ValueError('Columns can not be used to render CategorySeries.')
|
||
|
|
|
||
|
|
if series.data_type(X) is not Text:
|
||
|
|
raise ValueError('Bars only support Text values for the X axis.')
|
||
|
|
|
||
|
|
if series.data_type(Y) is not Number:
|
||
|
|
raise ValueError('Bars only support Number values for the Y axis.')
|
||
|
|
|
||
|
|
def to_svg(self, width, height, x_scale, y_scale, series, palette):
|
||
|
|
"""
|
||
|
|
Render columns to SVG elements.
|
||
|
|
"""
|
||
|
|
group = ET.Element('g')
|
||
|
|
group.set('class', 'series columns')
|
||
|
|
|
||
|
|
zero_y = y_scale.project(0, height, 0)
|
||
|
|
|
||
|
|
if self._fill_color:
|
||
|
|
fill_color = self._fill_color
|
||
|
|
else:
|
||
|
|
fill_color = next(palette)
|
||
|
|
|
||
|
|
for d in series.data():
|
||
|
|
if d.x is None or d.y is None:
|
||
|
|
continue
|
||
|
|
|
||
|
|
x1, x2 = x_scale.project_interval(d.x, 0, width)
|
||
|
|
proj_y = y_scale.project(d.y, height, 0)
|
||
|
|
|
||
|
|
if d.y < 0:
|
||
|
|
column_y = zero_y
|
||
|
|
column_height = proj_y - zero_y
|
||
|
|
else:
|
||
|
|
column_y = proj_y
|
||
|
|
column_height = zero_y - proj_y
|
||
|
|
|
||
|
|
if callable(fill_color):
|
||
|
|
color = fill_color(d)
|
||
|
|
else:
|
||
|
|
color = fill_color
|
||
|
|
|
||
|
|
group.append(ET.Element('rect',
|
||
|
|
x=six.text_type(x1),
|
||
|
|
y=six.text_type(column_y),
|
||
|
|
width=six.text_type(x2 - x1),
|
||
|
|
height=six.text_type(column_height),
|
||
|
|
fill=color
|
||
|
|
))
|
||
|
|
|
||
|
|
return group
|