glycorender

A bespoke SVG to PDF/PNG renderer for the GlycoDraw platform, specialized in accurately rendering glycan structures with support for chemical notations and path-based text positioning.

Features

• Accurate SVG to PDF and PNG conversion for glycan structures
• Support for text on paths with proper positioning and orientation
• Special handling for monosaccharide properties like "Df" with proper styling
• Gradient fills for circles and shapes
• Precise connection path rendering between glycan elements
• Support for various SVG path commands

Installation

pip install glycorender

Quick Start

from glycorender import convert_svg_to_pdf, convert_svg_to_png

# Convert SVG file to PDF
with open('glycan_structure.svg', 'r') as f:
    svg_data = f.read()
    
convert_svg_to_pdf(svg_data, 'output.pdf')

# Convert SVG file to PNG
convert_svg_to_png(svg_data, 'output.png')

# Or directly from SVG data
svg_data = """..."""
convert_svg_to_pdf(svg_data, 'output.pdf')
convert_svg_to_png(svg_data, 'output.png')

Use Cases

GlycoRender is specifically designed for:

• Converting glycan structure diagrams from GlycoDraw to publication-quality PDFs or PNGs
• Preserving the exact layout and styling of complex carbohydrate representations
• Ensuring chemical notations are properly formatted in the output
• Maintaining the correct connections between monosaccharide units

API Reference

convert_svg_to_pdf(svg_data, pdf_file_path)

Converts SVG data to a PDF file.

Parameters:

• svg_data (str or bytes): SVG content either as a string or bytes
• pdf_file_path (str): Path where the output PDF should be saved

convert_svg_to_png(svg_data, png_file_path)

Converts SVG data to a PNG file.

Parameters:

• svg_data (str or bytes): SVG content either as a string or bytes
• png_file_path (str): Path where the output PNG should be saved

Supported SVG Elements

• <path>: Full support for path commands (M, L, H, V, Z, etc.)
• <circle>: Support for basic circles and gradient-filled circles
• <rect>: Support for rectangles with stroke and fill
• <text> and <textPath>: Support for text placement along paths with proper orientation
• <defs>: Support for path and gradient definitions
• <radialGradient>: Support for radial gradients with stops

Dependencies

• ReportLab: For PDF generation
• PyMuPDF: For PNG conversion
• Pillow: For PNG metadata injection

Contributing

Contributions are welcome! Please feel free to submit a Pull Request.

License

This project is licensed under the MIT License - see the LICENSE file for details.