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Improve the country labeling

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- Set a maximum font size
- Try to label polygons that are too small for the full name with the
  2-letter contry code
This commit is contained in:
Thomas Kolb 2021-06-22 22:40:21 +02:00
parent bc3e6a1436
commit 492395840d
1 changed files with 18 additions and 5 deletions
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23
qsomap.py
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@ -10,6 +10,7 @@ import random
import argparse import argparse
LABEL_MIN_FONT_SIZE = 2 LABEL_MIN_FONT_SIZE = 2
LABEL_MAX_FONT_SIZE = 40
def map_azimuthal_equidistant(lat, lon, ref_lat, ref_lon, R=1): def map_azimuthal_equidistant(lat, lon, ref_lat, ref_lon, R=1):
@ -347,23 +348,35 @@ def svg_add_country_names(doc, simplegeodata, map_radius):
'fill': v['label_color'] 'fill': v['label_color']
} }
label = v['name']
# rotate text by 90 degrees if polygon is higher than wide # rotate text by 90 degrees if polygon is higher than wide
if h > w: if h > w:
font_size = h / len(v['name']) font_size = h / len(label)
rotate = True rotate = True
else: else:
font_size = w / len(v['name']) font_size = w / len(label)
rotate = False rotate = False
if font_size < LABEL_MIN_FONT_SIZE: if font_size < LABEL_MIN_FONT_SIZE:
print('.', end='', flush=True) # try again with 2-letter country code
continue # too small label = k
font_size = min(LABEL_MIN_FONT_SIZE*2,
(h if rotate else w) / len(label))
if font_size < LABEL_MIN_FONT_SIZE:
print('.', end='', flush=True)
continue # too small
else:
print('!', end='', flush=True)
else: else:
print('#', end='', flush=True) print('#', end='', flush=True)
font_size = min(LABEL_MAX_FONT_SIZE, font_size)
kwargs['font-size'] = font_size kwargs['font-size'] = font_size
txt = doc.text(v['name'], (center_x, center_y), txt = doc.text(label, (center_x, center_y),
**kwargs) **kwargs)
if rotate: if rotate: