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#!/usr/bin/env python
# -*- coding: utf-8 -*-
# -----------------------------------------------------------------------------
#
# FreeType high-level python API - Copyright 2011 Nicolas P. Rougier
# Distributed under the terms of the new BSD license.
#
# -----------------------------------------------------------------------------
'''
Show glyph metrics in horizontal and vertical layout
'''
from freetype import *
def arrow( x,y, dx, dy, **kwargs):
kwargs['shape'] = 'full'
kwargs['head_width'] = 30
kwargs['head_length'] = 40
kwargs['length_includes_head'] =True
kwargs['facecolor'] = 'k'
kwargs['edgecolor'] ='k'
kwargs['linewidth'] =.5
plt.arrow(x,y,dx,dy,**kwargs)
def double_arrow(x, y, dx, dy, **kwargs):
cx,cy = x+dx/2., y+dy/2.
dx /= 2.0
dy /= 2.0
arrow(cx,cy,+dx,+dy,**kwargs)
arrow(cx,cy,-dx,-dy,**kwargs)
def line(x, y, dx, dy, **kwargs):
kwargs['color'] = 'k'
kwargs['linewidth'] =.5
plt.plot([x,x+dx],[y,y+dy],**kwargs)
def point(x, y, r, **kwargs):
kwargs['color'] = 'k'
plt.scatter([x],[y],r,**kwargs)
def text( x,y,text, **kwargs):
kwargs['fontsize'] = 18
plt.text(x, y, text, **kwargs)
if __name__ == '__main__':
import numpy as np
import matplotlib.pyplot as plt
from matplotlib.path import Path
import matplotlib.patches as patches
face = Face('./Vera.ttf')
face.set_char_size( 32*64 )
face.load_char('g')
slot = face.glyph
bitmap = slot.bitmap
width = slot.bitmap.width
rows = slot.bitmap.rows
pitch = slot.bitmap.pitch
outline= slot.outline
start, end = 0, 0
VERTS, CODES = [], []
# Iterate over each contour
for i in range(len(outline.contours)):
end = outline.contours[i]
points = outline.points[start:end+1]
points.append(points[0])
tags = outline.tags[start:end+1]
tags.append(tags[0])
segments = [ [points[0],], ]
for j in range(1, len(points) ):
segments[-1].append(points[j])
if tags[j] & (1 << 0) and j < (len(points)-1):
segments.append( [points[j],] )
verts = [points[0], ]
codes = [Path.MOVETO,]
for segment in segments:
if len(segment) == 2:
verts.extend(segment[1:])
codes.extend([Path.LINETO])
elif len(segment) == 3:
verts.extend(segment[1:])
codes.extend([Path.CURVE3, Path.CURVE3])
else:
verts.append(segment[1])
codes.append(Path.CURVE3)
for i in range(1,len(segment)-2):
A,B = segment[i], segment[i+1]
C = ((A[0]+B[0])/2.0, (A[1]+B[1])/2.0)
verts.extend([ C, B ])
codes.extend([ Path.CURVE3, Path.CURVE3])
verts.append(segment[-1])
codes.append(Path.CURVE3)
VERTS.extend(verts)
CODES.extend(codes)
start = end+1
VERTS = np.array(VERTS)
x,y = VERTS[:,0], VERTS[:,1]
VERTS[:,0], VERTS[:,1] = x, y
path = Path(VERTS, CODES)
xmin, xmax = x.min(), x.max()
ymin, ymax = y.min(), y.max()
width,height = xmax-xmin, ymax-ymin
dw, dh = 0.2*width, 0.1*height
bearing = xmin - slot.metrics.horiBearingX, ymin - slot.metrics.horiBearingY
advance = slot.advance
origin = bearing
figure = plt.figure(figsize=(16,10), frameon=False, facecolor="white")
axes = plt.subplot(121, frameon=False, aspect=1)
glyph = patches.PathPatch(path, fill = True, facecolor='k', lw=0)
plt.xlim(xmin - .25*width, xmax + .75*width)
plt.ylim(ymin - .5*height, xmax + .75*height)
plt.xticks([]), plt.yticks([])
axes.add_patch(glyph)
# Y axis
arrow(origin[0], ymin-dh, 0, height+3*dh)
# X axis
arrow(origin[0]-dw, 0, width+3*dw, 0)
# origin
point(0,0,50)
text( -20, -20, "$origin$", va='top', ha='right')
# Bounding box
bbox = patches.Rectangle( (xmin,ymin), width, height, fill = False, lw=.5)
axes.add_patch(bbox)
# Width
line(xmin, ymax, 0, 3*dh, linestyle="dotted")
text( xmin, ymax+3.25*dh, "$x_{min}$", va='bottom', ha='center')
line(xmax, ymax, 0, 3*dh, linestyle="dotted")
text( xmax, ymax+3.25*dh, "$x_{max}$", va='bottom', ha='center')
double_arrow(xmin, ymax+2.5*dh, width, 0)
text(xmin+width/2., ymax+1.75*dh, "$width$", va='bottom', ha='center')
# Height
line(xmax, ymin, 3*dw, 0, linestyle="dotted")
text(xmax+3.25*dw, ymin, "$y_{min}$", va='baseline', ha='left')
line(xmax, ymax, 3*dw, 0, linestyle="dotted")
text(xmax+3.25*dw, ymax, "$y_{max}$", va='baseline', ha='left')
double_arrow(xmax+2.5*dw, ymin, 0, height)
text(xmax+2.75*dw, ymin+height/2., "$height$", va='center', ha='left')
# Advance
point(advance.x,0,50)
line(advance.x, 0, 0, ymin-dh, linestyle="dotted")
arrow(0, ymin-.5*dh, advance.x, 0)
text(advance.x/2., ymin-1.25*dh, "$advance$", va='bottom', ha='center')
# Bearing Y
arrow(xmax+.25*dw, 0, 0, ymax)
text(xmax+.5*dw, ymax/2, "$Y_{bearing}$", va='center', ha='left')
# Bearing X
arrow(0, ymax/2., xmin, 0)
text(-10, ymax/2, "$X_{bearing}$", va='baseline', ha='right')
# -------------------------------------------------------------------------
axes = plt.subplot(122, frameon=False, aspect=1)
glyph = patches.PathPatch(path, fill = True, facecolor='k', lw=0)
axes.add_patch(glyph)
plt.xlim(xmin - .25*width, xmax + .75*width)
plt.ylim(ymin - .5*height, xmax + .75*height)
plt.xticks([]), plt.yticks([])
advance = slot.metrics.vertAdvance
x_bearing = slot.metrics.vertBearingX
y_bearing = slot.metrics.vertBearingY
# Y axis
arrow(xmin-x_bearing, ymax+y_bearing+2*dh, 0, -advance-3*dh)
# X axis
arrow(xmin-2*dw, ymax+y_bearing, width+4*dw, 0)
# origin
point( xmin-x_bearing, ymax+y_bearing, 50)
text( xmin-x_bearing-30, ymax+y_bearing+10, "$origin$", va='bottom', ha='right')
# Bounding box
bbox = patches.Rectangle( (xmin,ymin), width, height, fill = False, lw=.5)
axes.add_patch(bbox)
# # Advance
point(xmin-x_bearing, ymax+y_bearing-advance, 50)
line(xmin-x_bearing, ymax+y_bearing-advance, xmax-dw, 0, linestyle="dotted")
arrow(xmax+dw, ymax+y_bearing, 0, -advance)
text(xmax+1.25*dw, ymax+y_bearing-advance/2., "$advance$", va='baseline', ha='left')
# Width
line(xmin, ymin, 0, -4*dh, linestyle="dotted")
text( xmin, ymin-4.25*dh, "$x_{min}$", va='top', ha='center')
line(xmax, ymin, 0, -4*dh, linestyle="dotted")
text( xmax, ymin-4.25*dh, "$x_{max}$", va='top', ha='center')
double_arrow(xmin, ymin-3.5*dh, width, 0)
text(xmin+width/2., ymin-3.75*dh, "$width$", va='top', ha='center')
# Height
line(xmin, ymin, -3*dw, 0, linestyle="dotted")
text(xmin-1.5*dw, ymin, "$y_{min}$", va='baseline', ha='right')
line(xmin, ymax, -3*dw, 0, linestyle="dotted")
text(xmin-1.5*dw, ymax, "$y_{max}$", va='baseline', ha='right')
double_arrow(xmin-.5*dw, ymin, 0, height)
text(xmin-.75*dw, ymin+height/2., "$height$", va='center', ha='right')
#point(xmin-x_bearing, ymax+y_bearing, 50)
# Bearing Y
arrow(xmax-.5*dw, ymax+y_bearing, 0, -y_bearing)
text(xmax-.5*dw, ymax+y_bearing+.25*dh, "$Y_{bearing}$", va='bottom', ha='center')
# # Bearing X
line(xmin, ymax, 0, 3*dh, linestyle="dotted")
arrow(xmin-x_bearing, ymax+y_bearing+dh, x_bearing, 0)
text(xmin-.25*dw, ymax+y_bearing+dh, "$X_{bearing}$", va='baseline', ha='right')
plt.savefig('glyph-metrics.pdf')
plt.show()
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