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#!/usr/bin/env python
# -*- coding: utf-8 -*-
# -----------------------------------------------------------------------------
#
# FreeType high-level python API - Copyright 2011-2015 Nicolas P. Rougier
# Distributed under the terms of the new BSD license.
#
# -----------------------------------------------------------------------------
import numpy
import os, sys
from freetype import *
class ColorMap:
''' A colormap is used to map scalar values to colors. It is build by
adding couples of (value,color) where value must be between 0 and 1.
The 'scale' method allows to specify the range of the colormap and
the 'color' method then returns a color for any value. '''
def __init__ (self, colors):
self.colors = colors
self.min = 0
self.max = 1
def scale (self, min, max):
self.min, self.max = min,max
def color (self, value):
''' Return the color corresponding to value. '''
if not len(self.colors):
return (0,0,0)
elif len(self.colors) == 1:
return self.colors[0][1]
elif value < self.min:
return self.colors[0][1]
elif value > self.max:
return self.colors[-1][1]
value = (value-self.min)/(self.max-self.min)
sup_color = self.colors[0]
inf_color = self.colors[-1]
for i in range (len(self.colors)-1):
if value < self.colors[i+1][0]:
inf_color = self.colors[i]
sup_color = self.colors[i+1]
break
r = (value-inf_color[0]) / (sup_color[0] - inf_color[0])
if r < 0: r = -r
color = [sup_color[1][0]*r + inf_color[1][0]*(1-r),
sup_color[1][1]*r + inf_color[1][1]*(1-r),
sup_color[1][2]*r + inf_color[1][2]*(1-r)]
return color
# Some colormaps
CM_IceAndFire = ColorMap([(0.00, (0.0, 0.0, 1.0)),
(0.25, (0.0, 0.5, 1.0)),
(0.50, (1.0, 1.0, 1.0)),
(0.75, (1.0, 1.0, 0.0)),
(1.00, (1.0, 0.0, 0.0))])
CM_Ice = ColorMap([(0.00, (0.0, 0.0, 1.0)),
(0.50, (0.5, 0.5, 1.0)),
(1.00, (1.0, 1.0, 1.0))])
CM_Fire = ColorMap([(0.00, (1.0, 1.0, 1.0)),
(0.50, (1.0, 1.0, 0.0)),
(1.00, (1.0, 0.0, 0.0))])
CM_Hot = ColorMap([(0.00, (0.0, 0.0, 0.0)),
(0.33, (1.0, 0.0, 0.0)),
(0.66, (1.0, 1.0, 0.0)),
(1.00, (1.0, 1.0, 1.0))])
CM_Grey = ColorMap([(0.00, (0.0, 0.0, 0.0)),
(1.00, (1.0, 1.0, 1.0))])
def imshow (Z, vmin=None, vmax=None, cmap=CM_Hot, show_cmap=False):
''' Show a 2D numpy array using terminal colors '''
if len(Z.shape) != 2:
print ("Cannot display non 2D array")
return
vmin = vmin or Z.min()
vmax = vmax or Z.max()
cmap.scale (vmin, vmax)
# Build initialization string that setup terminal colors
init = ''
for i in range(240):
v = cmap.min + (i/240.0)* (cmap.max - cmap.min)
r,g,b = cmap.color (v)
init += "\x1b]4;%d;rgb:%02x/%02x/%02x\x1b\\" % (16+i, int(r*255),int(g*255),int(b*255))
# Build array data string
data = ''
for i in range(Z.shape[0]):
for j in range(Z.shape[1]):
c = 16 + int( ((Z[Z.shape[0]-i-1,j]-cmap.min) / (cmap.max-cmap.min))*239)
if (c < 16):
c=16
elif (c > 255):
c=255
data += "\x1b[48;5;%dm " % c
u = cmap.max - (i/float(Z.shape[0]-1)) * ((cmap.max-cmap.min))
if show_cmap:
data += "\x1b[0m "
data += "\x1b[48;5;%dm " % (16 + (1-i/float(Z.shape[0]))*239)
data += "\x1b[0m %+.2f" % u
data += "\x1b[0m\n"
print (init+data[:-1]+'\x1b[0m')
if __name__ == '__main__':
face = Face('./Vera.ttf')
face.set_char_size( 32*64 )
face.load_glyph(face.get_char_index('S'))
slot = face.glyph
bitmap = slot.bitmap
data, rows, width = bitmap.buffer, bitmap.rows, bitmap.width
Z = numpy.array(data,dtype=float).reshape(rows,width)
Z = Z[::-1,:]
imshow (Z, cmap=CM_Grey)
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