Posterly
Chenruishuo/posterly
Create or revise academic conference posters in HTML/CSS and export print-ready PDFs.
Draws images, PDF/SVG vector files and animation frames with pycairo, and supplies what cairo lacks: shaped text for Arabic, Indic and other scripts, text along curves, blur/glow/drop shadows, path…
Install Drawing With Pycairo
$ npx skills add oaustegard/claude-skills --skill drawing-with-pycairo -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install oaustegard/claude-skills drawing-with-pycairo --agent claude-codeProject scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).
$ git clone --depth 1 https://github.com/oaustegard/claude-skills.git skills-src && mkdir -p .claude/skills && cp -r skills-src/drawing-with-pycairo .claude/skills/drawing-with-pycairo && rm -rf skills-srcUse ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.
Claude Code skills documentation · loads skills from .claude/skills/
Install the "drawing-with-pycairo" agent skill from https://github.com/oaustegard/claude-skills/tree/main/drawing-with-pycairo into .claude/skills/drawing-with-pycairo/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "drawing-with-pycairo", then confirm the skill loads.Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$skill-installer install https://github.com/oaustegard/claude-skills/tree/main/drawing-with-pycairoType this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.
$ npx skills add oaustegard/claude-skills --skill drawing-with-pycairo -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install oaustegard/claude-skills drawing-with-pycairo --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/oaustegard/claude-skills.git skills-src && mkdir -p .agents/skills && cp -r skills-src/drawing-with-pycairo .agents/skills/drawing-with-pycairo && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "drawing-with-pycairo" agent skill from https://github.com/oaustegard/claude-skills/tree/main/drawing-with-pycairo into .agents/skills/drawing-with-pycairo/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "drawing-with-pycairo", then confirm the skill loads.Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add oaustegard/claude-skills --skill drawing-with-pycairo -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install oaustegard/claude-skills drawing-with-pycairo --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/oaustegard/claude-skills.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/drawing-with-pycairo .cursor/skills/drawing-with-pycairo && rm -rf skills-srcUse ~/.cursor/skills/ instead of .cursor/skills for a personal install.
Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/
Install the "drawing-with-pycairo" agent skill from https://github.com/oaustegard/claude-skills/tree/main/drawing-with-pycairo into .cursor/skills/drawing-with-pycairo/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "drawing-with-pycairo", then confirm the skill loads.Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gemini skills install https://github.com/oaustegard/claude-skills.git --path drawing-with-pycairo--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.
$ npx skills add oaustegard/claude-skills --skill drawing-with-pycairo -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install oaustegard/claude-skills drawing-with-pycairo --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/oaustegard/claude-skills.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/drawing-with-pycairo .gemini/skills/drawing-with-pycairo && rm -rf skills-srcUse ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.
Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/
Install the "drawing-with-pycairo" agent skill from https://github.com/oaustegard/claude-skills/tree/main/drawing-with-pycairo into .gemini/skills/drawing-with-pycairo/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "drawing-with-pycairo", then confirm the skill loads.Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gh skill install oaustegard/claude-skills drawing-with-pycairoInstalls for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).
$ npx skills add oaustegard/claude-skills --skill drawing-with-pycairo -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/oaustegard/claude-skills.git skills-src && mkdir -p .github/skills && cp -r skills-src/drawing-with-pycairo .github/skills/drawing-with-pycairo && rm -rf skills-srcUse ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.
GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/
Install the "drawing-with-pycairo" agent skill from https://github.com/oaustegard/claude-skills/tree/main/drawing-with-pycairo into .github/skills/drawing-with-pycairo/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "drawing-with-pycairo", then confirm the skill loads.GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add oaustegard/claude-skills --skill drawing-with-pycairo -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install oaustegard/claude-skills drawing-with-pycairo --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/oaustegard/claude-skills.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/drawing-with-pycairo .opencode/skills/drawing-with-pycairo && rm -rf skills-srcUse ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.
OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/
Install the "drawing-with-pycairo" agent skill from https://github.com/oaustegard/claude-skills/tree/main/drawing-with-pycairo into .opencode/skills/drawing-with-pycairo/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "drawing-with-pycairo", then confirm the skill loads.OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
Facts
- Skill name
drawing-with-pycairo- GitHub stars
- 150
- Token cost
- ~1.9k tokens
- SKILL.md length
- 964 words
- Files
- 5 (incl. scripts)
- Skills in repo
- 67
- Repo updated
- First seen
- Licence
- MIT
At a glance
Draws images, PDF/SVG vector files and animation frames with pycairo, and supplies what cairo lacks: shaped text for Arabic, Indic and other scripts, text along curves, blur/glow/drop shadows, path…
- Writing pycairo
- SKILL.md covers Setup, Render, then look, What cairokit provides and Measured behaviour (800×600…, plus 2 more sections
- Runs Python scripts from its folder; calls pip, python3 and ffmpeg
- Cairo drawing code
What it does
Drawing With Pycairo is an agent skill from oaustegard/claude-skills. Draws images, PDF/SVG vector files and animation frames with pycairo, and supplies what cairo lacks: shaped text for Arabic, Indic and other scripts, text along curves, blur/glow/drop shadows, path booleans, stroke-to-outline, and Gouraud-shaded 3D. Use when writing pycairo or cairo drawing code, generative art, custom diagrams or posters rendered in Python, or when cairo output needs non-Latin text, soft effects, merged shapes or shaded surfaces.
Its SKILL.md is about 1.9k tokens, which your agent loads only when the skill is triggered. The skill folder holds 5 other files, including scripts (for example `CHANGELOG.md`, `README.md` and `scripts/cairokit.py`).
It sits in Media & Creative, covering Generative and creative coding and Diagrams. It works with Python. The repository describes itself as: My collection of Claude skills. The licence is MIT.
When your agent uses it
- Writing pycairo
- Cairo drawing code
- Custom diagrams
- Posters rendered in Python
Example prompts
- “Use the drawing-with-pycairo skill to draw images, PDF/SVG vector files and animation frames with pycairo, and supplies what cairo lacks: shaped…”
- “/drawing-with-pycairo”
Requirements
- Python 3
What it can do on your machine
Read from SKILL.md and the folder at commit 90b0f1b. It shows what the files ask for, not the result of running them.
Tool permissions
Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.
From allowed-tools in the SKILL.md frontmatter.
Runs code
Ships 2 files in scripts/ (Python), which the agent can run.
Shell commands in SKILL.md call:
pippython3ffmpeg
From the folder's file list and the shell code blocks in SKILL.md.
Network
No URLs in SKILL.md. Its commands use pip, which can reach the network depending on how they are called.
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.
Context cost
Drawing With Pycairo loads about 1.9k tokens when it runs. Until then it costs about 118 tokens; SKILL.md has 964 words of instructions outside code blocks.
Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.
Safety
Auto-check passed
The automated check found no risky patterns in SKILL.md.
Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); the scripts in this folder are not scanned.
SKILL.md
The full file from oaustegard/claude-skills at commit 90b0f1b, republished under its MIT licence (© oaustegard). 964 words, ~1,942 tokens.
Download SKILL.mdSave it as
.claude/skills/drawing-with-pycairo/SKILL.md (or your agent's skills folder). This skill also uses 4 other files; get the full folder from GitHub.- name
- drawing-with-pycairo
- description
- Draws images, PDF/SVG vector files and animation frames with pycairo, and supplies what cairo lacks: shaped text for Arabic, Indic and other scripts, text along curves, blur/glow/drop shadows, path booleans, stroke-to-outline, and Gouraud-shaded 3D. Use when writing pycairo or cairo drawing code, generative art, custom diagrams or posters rendered in Python, or when cairo output needs non-Latin text, soft effects, merged shapes or shaded surfaces.
- metadata.version
- 0.1.0
Drawing with pycairo
Cairo paints paths with solid colours, gradients, mesh gradients and images, and composites them with 20-odd operators. It writes PNG, PDF, SVG and PostScript. It does not shape text, filter pixels, combine paths, outline strokes, or do depth. scripts/cairokit.py fills each gap; scripts/selftest.py exercises all of it. Both were verified on pycairo 1.29.1 / cairo 1.18.0 / Python 3.11.
Setup
pip install --break-system-packages pycairo numpy uharfbuzz fonttools skia-pathops
python3 /mnt/skills/user/drawing-with-pycairo/scripts/selftest.py /tmp/cairo-selftestThe self-test prints the cairo version, whether Pango is usable, per-panel timings, and the path of a 2×2 contact sheet. Read that sheet: panel A shows joined Arabic in green next to broken toy-API Arabic in red, B shows four boolean results and an outlined wave, C shows glow and a soft shadow, D shows a smooth-shaded torus. Then:
import sys; sys.path.insert(0, "/mnt/skills/user/drawing-with-pycairo/scripts")
from cairokit import *In the environment where this was built, pycairo was not preinstalled. Pango was also absent: the system PyGObject was compiled for Python 3.12 while python3 was 3.11, and there were no Pango typelibs. pango() reports which case you are in.
Render, then look
Every render ends with a Read of the PNG before the next edit or before reporting. Exit codes and timings don't show visual bugs. In the session that produced this skill, looking caught five defects that ran without error:
- a painter sort drawn near-to-far
- inward normals combined with a light pointing away from the camera, which left a black knot
- a scene scaled in absolute pixels, cropped once the frame size changed
- glyphs crowding on a squashed spiral, because arc length was measured on the unsquashed curve
- a stray hook where a polyline's first
move_towasn't its first sample
For several outputs, contact_sheet() tiles them so one Read covers all of them. For animation, extract two or three frames with ffmpeg -ss T -i out.mp4 -frames:v 1 f.png and read those.
What cairokit provides
| need | call |
|---|---|
| surface + context with background | new_image(w, h, bg) |
| ASCII caption on a box | label(c, text, x, y) |
| pixels as numpy (BGRA, premultiplied, live view) | pixels(s), from_array(a), from_rgb_float(rgb) |
| blur, drop shadow, neon glow | gauss_blur(a, sigma), blurred(s, sigma), glow(sharp) |
| shaped text for any script, as outlines | Shaper(font_path).text_path(c, text, x, y, size) |
| text along a curve | Shaper.text_on_curve(c, text, polyline_walker(points), size) |
| union / intersection / difference / xor | boolean(c, build_a, build_b, op) |
| outline of a stroke | stroke_to_path(c, width, cap, join) |
| perspective, depth sort, smooth shading | project(P), painter_order(z), gouraud_mesh(quads, colors, order) |
| frames to MP4, many PNGs to one sheet | frames_to_mp4(pattern, out), contact_sheet(files, out) |
| Pango availability | pango() → (Pango, PangoCairo) or None |
Find a font for a script with fc-match -f '%{file}' 'DejaVu Sans:lang=ar' (or fc-list :lang=hi family file). DejaVu Sans covers Arabic and Hebrew; FreeSans covers Devanagari.
Measured behaviour (800×600 unless noted)
| thing | result |
|---|---|
| alpha circles, antialiased | ~58k/s (no-AA: ~139k/s) |
| one 200k-segment polyline stroke | ~1.0 s |
| ImageSurface max side | 32767; 32768 raises cairo.Error |
glow(), two blur radii | ~240 ms |
| 10k quads, flat fill_preserve+stroke | ~160 ms |
10k quads, one gouraud_mesh() | ~125 ms (faster, and smooth) |
| animation frame, 10k-quad mesh at 640×480 | ~130 ms |
| mesh gradient → PDF | kept as vector (ShadingType 6/7) |
| mesh gradient → SVG | rasterised to an embedded <image> (SVG has no mesh gradient) |
| 10k flat quads → SVG vs PDF | 3.5 MB vs 0.36 MB |
Cairo renders on one CPU core. For large batches or long animations, spread frames across processes with multiprocessing rather than threads.
Show full SKILL.md (430 more words)Show less
Behaviour that trips people
Text. show_text() / text_path() map codepoints to glyphs one by one, left to right, with no joining, reordering, ligatures or kerning. They are fine for ASCII labels. For anything else, use Pango if pango() returns modules, otherwise Shaper. Shaper does no line wrapping, no bidi across mixed-direction runs, and no font fallback: one font per call, and you split runs yourself.
Paths and the CTM. Path coordinates are transformed when they are appended, and the path is not part of the saved state. save(); scale(); <append>; restore(); fill() fills the transformed shape without distorting anything later. Line width, however, is transformed at stroke() time. Stroking inside a non-uniform scale() gives calligraphic, uneven lines, so restore first.
Pixels. ARGB32 memory is B,G,R,A per pixel, alpha-premultiplied, with rows get_stride() bytes apart. Call flush() before reading and mark_dirty() after writing. pixels() and from_array() handle this. Blurring premultiplied data is correct; un-premultiplying first gives dark fringes.
Seams. Two antialiased fills sharing an edge leave a faint line of background between them (conflation). Fixes: fill_preserve() plus a 0.5–0.7 px stroke in the same colour, or a single MeshPattern for the whole surface.
MeshPattern. Neighbouring Coons patches must use the identical curve for their shared edge. Generate each edge's control points in a canonical direction and reverse them for the other patch, or seams appear. Patches paint in insertion order, which is what makes gouraud_mesh() a painter's-algorithm renderer.
3D. There is no depth buffer. Sorting by mean depth fails when polygons interpenetrate or are long and thin across depth; subdividing helps. Use two-sided normals (flip toward the camera) unless the mesh orientation is known. Screen y points down, so a light "from the top left, toward the camera" is (-x, -y, -z) with camera-space +z pointing away.
skia-pathops. Round caps and joins produce conic segments, and simplify() rejects them; stroke_to_path() converts them to quadratics first. Any other pathops output passed to append_pathops() needs convertConicsToQuads() too.
Output. SVGSurface / PDFSurface must be finish()ed, or the file is truncated. RecordingSurface records once and replays at any scale or to any backend. Operators such as ADD, SCREEN, MULTIPLY and DIFFERENCE are on the context (set_operator). Float formats FORMAT_RGB96F / FORMAT_RGBA128F exist from cairo 1.18 for HDR-ish accumulation.
Route elsewhere
| task | use |
|---|---|
| data charts | charting (matplotlib/seaborn) |
| photo edits, resizing, format conversion | processing-images |
| raster image to SVG | image-to-svg |
| illustrations or portraits from a prompt | invoking-gemini |
| real 3D (occlusion, textures, >50k polygons) | a rasteriser or ray tracer; cairo's painter approach stops being practical |
| polygon analysis (areas, buffers, spatial predicates) | shapely; use skia-pathops when the result goes back into cairo as curves |
© oaustegard, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file
Files
SKILL.md and 4 other files (scripts) in drawing-with-pycairo of oaustegard/claude-skills.
- SKILL.md
- CHANGELOG.md
- README.md
- scripts/cairokit.py
- scripts/selftest.py
Open the folder on GitHubat commit 90b0f1b
Compare with similar skills
Drawing With Pycairo next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.
| Skill | Stars | Used in | Tokens | Auto-check | Licence | Repo updated |
|---|---|---|---|---|---|---|
| Drawing With Pycairo this skilloaustegard/claude-skills | 150 | — | ~1.9k | Automated safety check: Pass | MIT | |
| PosterlyChenruishuo/posterly | 416 | — | ~4.6k | Automated safety check: Notes | AGPL-3.0 | |
| Microsim Generatordmccreary/ibook-skills | 105 | — | ~11k | Automated safety check: Pass | None | |
| Visual Flow GifAI-Builder-Club/skills | 1.3k | — | ~845 | Automated safety check: Pass | None | |
| Visual Designaws-samples/sample-strands-agent-with-agentcore | 195 | — | ~1.5k | Automated safety check: Pass | MIT | |
| Poster Designeraipoch/medical-research-skills | 1.9k | — | ~1.3k | Automated safety check: Pass | MIT |
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Related
Works with
Categories
Questions about Drawing With Pycairo
What does Drawing With Pycairo do?
Draws images, PDF/SVG vector files and animation frames with pycairo, and supplies what cairo lacks: shaped text for Arabic, Indic and other scripts, text along curves, blur/glow/drop shadows, path…. Drawing With Pycairo is an agent skill from oaustegard/claude-skills. Draws images, PDF/SVG vector files and animation frames with pycairo, and supplies what cairo lacks: shaped text for Arabic, Indic and other scripts, text along curves, blur/glow/drop shadows, path booleans, stroke-to-outline, and Gouraud-shaded 3D.
When should I use Drawing With Pycairo?
Drawing With Pycairo fits situations like: writing pycairo; cairo drawing code; custom diagrams; posters rendered in Python.
How do I install Drawing With Pycairo in Claude Code?
Run `npx skills add oaustegard/claude-skills --skill drawing-with-pycairo -a claude-code`. Or copy the skill folder (drawing-with-pycairo in oaustegard/claude-skills) into .claude/skills/drawing-with-pycairo in your project. Claude Code loads it when a task matches its description.
How do I install Drawing With Pycairo in Codex?
Run `npx skills add oaustegard/claude-skills --skill drawing-with-pycairo -a codex`. Or copy the skill folder (drawing-with-pycairo in oaustegard/claude-skills) into .agents/skills/drawing-with-pycairo in your project. Codex loads it when a task matches its description.
Can I use Drawing With Pycairo in Cursor, Gemini CLI or GitHub Copilot?
Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add oaustegard/claude-skills --skill drawing-with-pycairo -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/drawing-with-pycairo, .gemini/skills/drawing-with-pycairo, .github/skills/drawing-with-pycairo and .opencode/skills/drawing-with-pycairo in your project.
What does Drawing With Pycairo need to run?
Going by SKILL.md and its folder, Drawing With Pycairo needs Python for the scripts in its folder and the command-line tools its instructions call (pip, python3 and ffmpeg). Our summary lists: Python 3.
Does Drawing With Pycairo access the network?
SKILL.md contains no URLs. Its commands use pip, which can reach the network depending on how they are called. This is read from the text; nothing was executed.
Is Drawing With Pycairo safe to install?
Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. The check reads SKILL.md only: the scripts in the folder are not scanned, so read them before running anything.
What licence does Drawing With Pycairo use?
Drawing With Pycairo is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.
How many tokens does Drawing With Pycairo use?
About 1.9k tokens (SKILL.md is roughly 7.8k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.
What are the alternatives to Drawing With Pycairo?
Skills that share tags, products or a category with Drawing With Pycairo: Posterly (Chenruishuo/posterly, 416 stars), Microsim Generator (dmccreary/ibook-skills, 105 stars), Visual Flow Gif (AI-Builder-Club/skills, 1.3k stars) and Visual Design (aws-samples/sample-strands-agent-with-agentcore, 195 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Drawing With Pycairo?
oaustegard (a GitHub user) maintains it in oaustegard/claude-skills, which has 150 GitHub stars. The repository holds 67 skills in this directory. The repository was last updated on October 9, 2026.
Source: oaustegard/claude-skills on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.