70 lines
2.3 KiB
Python
70 lines
2.3 KiB
Python
import os
|
|
|
|
import svgwrite
|
|
from svgwrite.shapes import Polyline
|
|
|
|
from dataclasses import Glyph, Metadata
|
|
|
|
base = 16
|
|
cap = -16
|
|
svg_size = 1024
|
|
guard = 12
|
|
line_style = {'fill': 'none', 'stroke': 'black', 'stroke-width': 0, 'stroke-linecap': 'round',
|
|
'stroke-linejoin': 'round'}
|
|
|
|
|
|
def generate(glyph: Glyph, metadata: Metadata):
|
|
"""Uses the glyph and the metadata to create the SVGs.
|
|
|
|
The subfolder is the font name.
|
|
The SVG name contains the metadata necessary to import the glyph to the font.
|
|
"""
|
|
print(f'Generating character \'{metadata.character}\' for font {metadata.font_name}')
|
|
|
|
# Assumes font folder already exists
|
|
font_path = os.path.join(os.getcwd(), 'svgs', metadata.font_name)
|
|
|
|
left_side_bearing, right_side_bearing = _calculate_bearings(glyph)
|
|
svg_filename = f'ascii{str(metadata.ascii_value)}_l{left_side_bearing}_r{right_side_bearing}.svg'
|
|
dwg = svgwrite.Drawing(os.path.join(font_path, svg_filename), viewBox=f"0 0 {svg_size} {svg_size}")
|
|
|
|
points = []
|
|
for coordinate in glyph.coordinates:
|
|
if coordinate:
|
|
x, y = coordinate
|
|
x = _map_to_svg(x)
|
|
y = _map_to_svg(y)
|
|
points.append((x, y))
|
|
else:
|
|
# Pen up
|
|
# Always check if line is empty (i.e. points array is empty).
|
|
# Empty lines can cause problems.
|
|
if points:
|
|
dwg.add(Polyline(points, **line_style))
|
|
points = []
|
|
|
|
# Finalize the drawing
|
|
if points:
|
|
dwg.add(Polyline(points, **line_style))
|
|
|
|
dwg.save()
|
|
|
|
|
|
def _calculate_bearings(glyph: Glyph):
|
|
if glyph.coordinates:
|
|
leftmost_point = _map_to_svg(min(coordinate[0] for coordinate in glyph.coordinates if coordinate))
|
|
rightmost_point = _map_to_svg(max(coordinate[0] for coordinate in glyph.coordinates if coordinate))
|
|
else:
|
|
leftmost_point = rightmost_point = _map_to_svg(0)
|
|
|
|
left_side_bearing = leftmost_point - _map_to_svg(glyph.left)
|
|
right_side_bearing = _map_to_svg(glyph.right) - rightmost_point
|
|
return left_side_bearing, right_side_bearing
|
|
|
|
|
|
def _map_to_svg(x):
|
|
# Scale proportionally (* svg_size / (base - cap))
|
|
# Guard to avoid going out of bounds after stroking the character
|
|
# Offset, since the SVG starts at zero (+ svg_size / 2)
|
|
return x * (svg_size - 2 * guard) / (base - cap) + svg_size / 2
|