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Copy pathplotille_text_backend.py
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434 lines (401 loc) · 10.9 KB
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# Copyright 2020 The SQLFlow Authors. All rights reserved.
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import io
from matplotlib._pylab_helpers import Gcf
from matplotlib.backend_bases import FigureManagerBase
from matplotlib.backends.backend_agg import FigureCanvasAgg, RendererAgg
from PIL import Image
from plotille import Canvas
class RendererPlotille(RendererAgg):
def __init__(self, width, height, dpi):
super(RendererPlotille, self).__init__(width, height, dpi)
self.texts = []
def clear(self):
super(RendererPlotille, self).clear()
self.texts = []
def draw_text(self, gc, x, y, s, prop, angle, ismath=False, mtext=None):
self.texts.append((x, y, s))
def show():
try:
for manager in Gcf.get_all_fig_managers():
canvas = manager.canvas
canvas.draw()
string = canvas.to_txt()
print(string)
finally:
pass
class FigureCanvasPlotille(FigureCanvasAgg):
def print_figure(self, fname, **kwargs):
try:
for manager in Gcf.get_all_fig_managers():
canvas = manager.canvas
canvas.draw()
string = canvas.to_txt()
print(string,
file=open(fname + '.txt', 'w', encoding="utf-8"),
end='')
finally:
pass
def get_renderer(self, cleared=False):
l, b, w, h = self.figure.bbox.bounds
key = w, h, self.figure.dpi
reuse_renderer = (hasattr(self, "renderer")
and getattr(self, "_lastKey", None) == key)
if not reuse_renderer:
self.renderer = RendererPlotille(w, h, self.figure.dpi)
self._lastKey = key
elif cleared:
self.renderer.clear()
return self.renderer
def to_txt(self):
# import pdb; pdb.set_trace()
buf = io.BytesIO()
self.print_png(buf)
buf.seek(0)
i = Image.open(buf).convert('RGB')
w, h = i.size
can = Canvas(128, int(80 / w * h), color_mode='byte')
for y in range(h):
for x in range(w):
center = i.getpixel((x, y))
if center == (255, 255, 255):
continue
if x in range(1, w - 1) and y in range(1, h - 1):
# Use the most deepest color in a 3x3 area as
# the center color
surrounding = i.getpixel((x, y - 1)) # upper
center = surrounding if grayscale(center) > grayscale(
surrounding) else center
surrounding = i.getpixel((x, y + 1)) # lower
center = surrounding if grayscale(center) > grayscale(
surrounding) else center
surrounding = i.getpixel((x - 1, y)) # left
center = surrounding if grayscale(center) > grayscale(
surrounding) else center
surrounding = i.getpixel((x + 1, y)) # right
center = surrounding if grayscale(center) > grayscale(
surrounding) else center
surrounding = i.getpixel((x - 1, y - 1)) # upper left
center = surrounding if grayscale(center) > grayscale(
surrounding) else center
surrounding = i.getpixel((x + 1, y - 1)) # upper right
center = surrounding if grayscale(center) > grayscale(
surrounding) else center
surrounding = i.getpixel((x - 1, y + 1)) # lower left
center = surrounding if grayscale(center) > grayscale(
surrounding) else center
surrounding = i.getpixel((x + 1, y + 1)) # lower right
center = surrounding if grayscale(center) > grayscale(
surrounding) else center
color = closest_term256_color(center)
if grayscale(center) < 200: # Ignore background color
can.point(float(x) / w, 1 - float(y) / h, True, color)
def set_text(canvas, x, y, text):
x_idx = canvas._transform_x(x)
y_idx = canvas._transform_y(y)
x_c = max(x_idx // 2, 0)
y_c = max(y_idx // 4, 0)
for i, c in enumerate(text):
canvas._canvas[y_c][x_c + i] = c
for x, y, s in self.renderer.texts:
set_text(can, float(x) / w, 1 - float(y) / h, s)
txt = can.plot()
upper_margin = '⠀' * 128 + '\n'
while txt.startswith(upper_margin):
txt = txt[len(upper_margin):]
return txt.rstrip('⠀ \n') # Remove bottom margin
color_map = {}
# Convert RGB to grayscale, see
# https://www.tutorialspoint.com/dip/grayscale_to_rgb_conversion.htm
def grayscale(rgb):
return 0.3 * rgb[0] + 0.59 * rgb[1] + 0.11 * rgb[2]
# Compute distance between two RGB color
def distance(c1, c2):
c1r, c1g, c1b = c1
c2r, c2g, c2b = c2
dr = c1r - c2r
dg = c1g - c2g
db = c1b - c2b
return dr * dr + dg * dg + db * db
# Find the closest xterm 256 colors
def closest_term256_color(pixel):
best = color_map.get(pixel, None)
bestdist = 0.0
for i, v in enumerate(colors):
dist = distance(pixel, v)
if best is None or dist < bestdist:
best = i
bestdist = dist
color_map[pixel] = best
return best
FigureCanvas = FigureCanvasPlotille
FigureManager = FigureManagerBase
# Mapping xterm 256 colors to RGB, see https://jonasjacek.github.io/colors/
colors = [
(0, 0, 0),
(128, 0, 0),
(0, 128, 0),
(128, 128, 0),
(0, 0, 128),
(128, 0, 128),
(0, 128, 128),
(192, 192, 192),
(128, 128, 128),
(255, 0, 0),
(0, 255, 0),
(255, 255, 0),
(0, 0, 255),
(255, 0, 255),
(0, 255, 255),
(255, 255, 255),
(0, 0, 0),
(0, 0, 95),
(0, 0, 135),
(0, 0, 175),
(0, 0, 215),
(0, 0, 255),
(0, 95, 0),
(0, 95, 95),
(0, 95, 135),
(0, 95, 175),
(0, 95, 215),
(0, 95, 255),
(0, 135, 0),
(0, 135, 95),
(0, 135, 135),
(0, 135, 175),
(0, 135, 215),
(0, 135, 255),
(0, 175, 0),
(0, 175, 95),
(0, 175, 135),
(0, 175, 175),
(0, 175, 215),
(0, 175, 255),
(0, 215, 0),
(0, 215, 95),
(0, 215, 135),
(0, 215, 175),
(0, 215, 215),
(0, 215, 255),
(0, 255, 0),
(0, 255, 95),
(0, 255, 135),
(0, 255, 175),
(0, 255, 215),
(0, 255, 255),
(95, 0, 0),
(95, 0, 95),
(95, 0, 135),
(95, 0, 175),
(95, 0, 215),
(95, 0, 255),
(95, 95, 0),
(95, 95, 95),
(95, 95, 135),
(95, 95, 175),
(95, 95, 215),
(95, 95, 255),
(95, 135, 0),
(95, 135, 95),
(95, 135, 135),
(95, 135, 175),
(95, 135, 215),
(95, 135, 255),
(95, 175, 0),
(95, 175, 95),
(95, 175, 135),
(95, 175, 175),
(95, 175, 215),
(95, 175, 255),
(95, 215, 0),
(95, 215, 95),
(95, 215, 135),
(95, 215, 175),
(95, 215, 215),
(95, 215, 255),
(95, 255, 0),
(95, 255, 95),
(95, 255, 135),
(95, 255, 175),
(95, 255, 215),
(95, 255, 255),
(135, 0, 0),
(135, 0, 95),
(135, 0, 135),
(135, 0, 175),
(135, 0, 215),
(135, 0, 255),
(135, 95, 0),
(135, 95, 95),
(135, 95, 135),
(135, 95, 175),
(135, 95, 215),
(135, 95, 255),
(135, 135, 0),
(135, 135, 95),
(135, 135, 135),
(135, 135, 175),
(135, 135, 215),
(135, 135, 255),
(135, 175, 0),
(135, 175, 95),
(135, 175, 135),
(135, 175, 175),
(135, 175, 215),
(135, 175, 255),
(135, 215, 0),
(135, 215, 95),
(135, 215, 135),
(135, 215, 175),
(135, 215, 215),
(135, 215, 255),
(135, 255, 0),
(135, 255, 95),
(135, 255, 135),
(135, 255, 175),
(135, 255, 215),
(135, 255, 255),
(175, 0, 0),
(175, 0, 95),
(175, 0, 135),
(175, 0, 175),
(175, 0, 215),
(175, 0, 255),
(175, 95, 0),
(175, 95, 95),
(175, 95, 135),
(175, 95, 175),
(175, 95, 215),
(175, 95, 255),
(175, 135, 0),
(175, 135, 95),
(175, 135, 135),
(175, 135, 175),
(175, 135, 215),
(175, 135, 255),
(175, 175, 0),
(175, 175, 95),
(175, 175, 135),
(175, 175, 175),
(175, 175, 215),
(175, 175, 255),
(175, 215, 0),
(175, 215, 95),
(175, 215, 135),
(175, 215, 175),
(175, 215, 215),
(175, 215, 255),
(175, 255, 0),
(175, 255, 95),
(175, 255, 135),
(175, 255, 175),
(175, 255, 215),
(175, 255, 255),
(215, 0, 0),
(215, 0, 95),
(215, 0, 135),
(215, 0, 175),
(215, 0, 215),
(215, 0, 255),
(215, 95, 0),
(215, 95, 95),
(215, 95, 135),
(215, 95, 175),
(215, 95, 215),
(215, 95, 255),
(215, 135, 0),
(215, 135, 95),
(215, 135, 135),
(215, 135, 175),
(215, 135, 215),
(215, 135, 255),
(215, 175, 0),
(215, 175, 95),
(215, 175, 135),
(215, 175, 175),
(215, 175, 215),
(215, 175, 255),
(215, 215, 0),
(215, 215, 95),
(215, 215, 135),
(215, 215, 175),
(215, 215, 215),
(215, 215, 255),
(215, 255, 0),
(215, 255, 95),
(215, 255, 135),
(215, 255, 175),
(215, 255, 215),
(215, 255, 255),
(255, 0, 0),
(255, 0, 95),
(255, 0, 135),
(255, 0, 175),
(255, 0, 215),
(255, 0, 255),
(255, 95, 0),
(255, 95, 95),
(255, 95, 135),
(255, 95, 175),
(255, 95, 215),
(255, 95, 255),
(255, 135, 0),
(255, 135, 95),
(255, 135, 135),
(255, 135, 175),
(255, 135, 215),
(255, 135, 255),
(255, 175, 0),
(255, 175, 95),
(255, 175, 135),
(255, 175, 175),
(255, 175, 215),
(255, 175, 255),
(255, 215, 0),
(255, 215, 95),
(255, 215, 135),
(255, 215, 175),
(255, 215, 215),
(255, 215, 255),
(255, 255, 0),
(255, 255, 95),
(255, 255, 135),
(255, 255, 175),
(255, 255, 215),
(255, 255, 255),
(8, 8, 8),
(18, 18, 18),
(28, 28, 28),
(38, 38, 38),
(48, 48, 48),
(58, 58, 58),
(68, 68, 68),
(78, 78, 78),
(88, 88, 88),
(98, 98, 98),
(108, 108, 108),
(118, 118, 118),
(128, 128, 128),
(138, 138, 138),
(148, 148, 148),
(158, 158, 158),
(168, 168, 168),
(178, 178, 178),
(188, 188, 188),
(198, 198, 198),
(208, 208, 208),
(218, 218, 218),
(228, 228, 228),
(238, 238, 238),
]
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