Initial commit

svggenerator.py

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+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):
+    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)
+    # Round because the font should only contain integers
+    return x * (svg_size - 2 * guard) / (base - cap) + svg_size / 2