svg-cover-generator（svg 封面生成器）

SVG Cover Generator

Generate one self-contained SVG cover that is visually intentional, easy to edit, and ready to save as .svg.

Quick Flow

1. Confirm the target format, dimensions, text content, and mood.
2. Read design-rules.md and layout-recipes.md before composing.
3. Pick one layout recipe that matches the brief.
4. Write a complete SVG with inline styles and no external dependencies.
5. Validate the SVG structure before finishing.

Intake

If the user already gave a clear brief, do not over-question. Otherwise collect the minimum missing inputs:

• Title
• Optional subtitle or byline
• Intended use: report cover, social card, slide cover, poster, hero image
• Canvas size or aspect ratio
• Brand colors or visual mood
• Whether the output should feel corporate, editorial, playful, technical, minimal, or bold

Reasonable defaults:

• Use 1600x900 for general landscape covers.
• Use 1080x1350 for portrait social-style covers.
• Use 1080x1080 for square covers.
• Use a clean sans-serif fallback stack inside the SVG unless the user provided a font direction.

Composition Rules

• Prefer bold typography and a small number of strong shapes over busy illustration.
• Keep the title as the dominant element.
• Use 2-4 colors unless the brief asks for a richer palette.
• Use gradients, grids, bands, masks, or geometric clusters to create atmosphere.
• Keep all text editable as <text> unless the user explicitly asks for paths.
• Avoid embedded raster images unless the user explicitly provides one and wants it included.

Build Procedure

1. Choose a layout

Select a layout from layout-recipes.md that fits the brief.

2. Build the SVG

Always produce:

• An <svg> root with xmlns, width, height, and viewBox
• A background layer
• A content layer for title and supporting text
• One visual motif layer such as lines, circles, blocks, mesh-like gradients, or abstract geometry

Keep styles inline in a <style> block or on elements. Do not rely on external CSS, web fonts, or remote assets.

3. Make the output usable

• Escape XML-sensitive characters in text.
• Keep the hierarchy readable with grouping and brief comments when helpful.
• Ensure contrast is strong enough for the title to remain legible.
• Leave comfortable margins so text does not touch the canvas edge.

Validation

Before finishing, check:

• The file is valid XML-style SVG.
• viewBox matches the intended composition size.
• Required text from the brief is present.
• There are no external asset references.
• The artwork is self-contained and editable.

If the SVG is saved to a file, run:

python3 scripts/check_svg.py /path/to/file.svg

Output

When the user asked for the SVG itself, return the full SVG in a fenced svg block.

When the user asked for a file, write the SVG to the requested path and summarize:

• dimensions
• chosen layout
• palette
• validation result

Resources

• Use design-rules.md for visual and technical rules.
• Use layout-recipes.md for composition choices.
• Use assets/templates/ as starting points when a blank canvas would slow things down.
• Use scripts/check_svg.py to catch structural mistakes before handing off the file.