47 lines
1.6 KiB
Python
47 lines
1.6 KiB
Python
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# -*- coding: utf-8 -*-
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"""
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This module implements a rainbow effect renderer.
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"""
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from __future__ import division
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from __future__ import absolute_import
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from __future__ import print_function
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from __future__ import unicode_literals
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from asciimatics.renderers.base import StaticRenderer
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class Rainbow(StaticRenderer):
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"""
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Chained renderer to add rainbow colours to output of another renderer.
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The embedded rendered must not use multi-colour mode (i.e. ${c,a}
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mark-ups) as these will be converted to explicit text by this renderer.
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"""
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# Colour palette when limited to 16 colours (8 dim and 8 bright).
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_16_palette = [1, 1, 3, 3, 2, 2, 6, 6, 4, 4, 5, 5]
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# Colour palette for 256 colour xterm mode.
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_256_palette = [196, 202, 208, 214, 220, 226,
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154, 118, 82, 46,
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47, 48, 49, 50, 51,
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45, 39, 33, 27, 21,
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57, 93, 129, 201,
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200, 199, 198, 197]
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def __init__(self, screen, renderer):
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"""
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:param screen: The screen object for this renderer.
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:param renderer: The renderer to wrap.
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"""
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super(Rainbow, self).__init__()
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palette = self._256_palette if screen.colours > 16 else self._16_palette
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for image in renderer.images:
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new_image = ""
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for y, line in enumerate(image):
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for x, c in enumerate(line):
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colour = (x + y) % len(palette)
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new_image += '${%d,1}%s' % (palette[colour], c)
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if y < len(image) - 1:
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new_image += "\n"
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self._images.append(new_image)
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