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