Tencent SkillHub · AI

Mechanics Sketches

Generate technical engineering mechanics sketches (beams, supports, forces, moments, dimensions, coordinate systems) as PDF/PNG/SVG using the MechanicsSketch...

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Generate technical engineering mechanics sketches (beams, supports, forces, moments, dimensions, coordinate systems) as PDF/PNG/SVG using the MechanicsSketch...

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Requirements

Target platform: OpenClaw
Install method: Manual import
Extraction: Extract archive
Prerequisites: OpenClaw
Primary doc: SKILL.md

Package facts

Download mode: Yavira redirect
Package format: ZIP package
Source platform: Tencent SkillHub
What's included: CHANGELOG.md, references/api_reference.md, scripts/generate_sketch.py, SKILL.md

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Trust & source

Release facts

Source: Tencent SkillHub
Verification: Indexed source record
Version: 1.0.0

Provenance

Publisher: MatthiasHBusch
Source page: View original listing
Canonical URL: Open canonical page

Documentation

ClawHub primary doc Primary doc: SKILL.md 15 sections Open source page

MechanicsSketches Skill

You can generate engineering mechanics sketches programmatically using the MechanicsSketches Python library.

Setup

Install the library via pip: pip install git+https://github.com/MatthiasHBusch/MechanicsSketches.git Or install dependencies manually and add to PYTHONPATH: pip install matplotlib PyQt5 export PYTHONPATH="/path/to/parent/of/MechanicsSketches:$PYTHONPATH"

Quick Start — Writing a Script

Create a Python script that builds a sketch and renders it: from MechanicsSketches import * import os sketch = create_sketch("My Sketch") S = 30.0 # Scale factor (recommended: 20-40) # Add components add_beam(sketch, ax=0, ay=0, bx=10*S, by=0, scale_factor=S) add_pinned_support(sketch, cx=0, cy=0, angle_deg=0, scale_factor=S) add_roller_support(sketch, cx=10*S, cy=0, angle_deg=0, scale_factor=S) add_force(sketch, cx=5*S, cy=0, angle_deg=0, scale_factor=S, annotation=r"$F$") # Render script_dir = os.path.dirname(os.path.abspath(__file__)) render(sketch, filename=os.path.join(script_dir, "output.pdf"), dpi=300) Then run: python my_sketch.py

Quick Start — Using the Helper Script

Alternatively, use the bundled helper to render from JSON: python scripts/generate_sketch.py input.json output.pdf

Scale Factor (S)

All positions and sizes should be multiples of S (typically 30.0). This keeps proportions consistent across components.

Angle Convention

angle_deg=0 → default orientation (upward for supports/forces, horizontal for dimensions) Angles rotate counterclockwise in degrees

Available Components

FunctionDescriptionKey Parametersadd_beam(sketch, ax, ay, bx, by, scale_factor)Rectangular beam A→BEndpoints, scaleadd_truss(sketch, ax, ay, bx, by, scale_factor)Line member A→BEndpoints, scaleadd_pinned_support(sketch, cx, cy, angle_deg, scale_factor)Fixed-position support (triangle)Center, angle, scaleadd_roller_support(sketch, cx, cy, angle_deg, scale_factor)Sliding supportCenter, angle, scaleadd_fixed_support(sketch, cx, cy, angle_deg, scale_factor)Clamped wall supportCenter, angle, scaleadd_hinge(sketch, cx, cy, scale_factor)Joint circleCenter, scaleadd_force(sketch, cx, cy, angle_deg, scale_factor, annotation, ...)Force arrowCenter, angle, scale, labeladd_moment(sketch, cx, cy, angle_deg, scale_factor, annotation, ...)Curved moment arrowCenter, angle, scale, labeladd_dimension_arrow(sketch, cx, cy, length, angle_deg, scale_factor, annotation, ...)Double-headed dimensionCenter, length, angle, scale, labeladd_dimension_thickness(sketch, cx, cy, thickness, angle_deg, scale_factor, annotation, ...)Inward dimension arrowsCenter, thickness, angle, scale, labeladd_coordinate_system(sketch, cx, cy, angle_deg, scale_factor, ax1, ax2, ax3, ...)x-y-z axesCenter, angle, scale, axis labelsadd_text(sketch, x, y, text, fontsize, name, rotation)Text annotationPosition, text, font size

Annotation Parameters

Force, moment, and dimension functions accept: annotation — LaTeX string (e.g., r"$F$", r"$M_A$") fontsize_scale — relative font size (default 1.0) offsetx, offsety — label position offset rotate_annotation — rotate label with component (default False)

Primitives

For custom shapes, use: make_line(x0, y0, x1, y1, linewidth, layer, edgecolor) make_circle(x, y, r, linewidth, layer, facecolor, edgecolor) make_polygon(points, linewidth, layer, facecolor, edgecolor) make_arc(x, y, width, height, theta1, theta2, angle, linewidth, layer) make_text(x, y, text, fontsize, layer, color, ha, va, rotation) make_rectangle(x0, y0, x1, y1, ...) Add to sketch via add_to_sketch(sketch, primitive).

Transformations

translate(obj, dx, dy) — move by offset rotate(obj, cx, cy, angle_deg) — rotate around point scale(obj, cx, cy, factor) — scale from center All return new objects (non-destructive). Can be chained.

Rendering

render(sketch, filename="output.pdf", dpi=300) # Qt renderer (default, recommended) mpl_render(sketch, filename="output.pdf") # Matplotlib fallback (deprecated, text scaling issues) Supported formats: .pdf, .png, .jpg, .svg

Tips for the Agent

Always define S = 30.0 as the scale factor Place beams first, then supports at endpoints, then loads Use LaTeX for annotations: r"$F$", r"$M_0$", r"$\ell$" For detailed API signatures, see references/api_reference.md The render() function requires a filename — it does not display interactively Do not use mpl_render() — it is deprecated due to text scaling issues. Always use render().

External Endpoints

This skill makes no network requests. All processing is done locally.

Security & Privacy

No data leaves your machine. The skill only reads local JSON files and writes local image/PDF output. No API keys or credentials are required. No telemetry or analytics. The helper script (scripts/generate_sketch.py) only reads the input file specified by the user and writes to the specified output path.

Trust Statement

This skill is developed and maintained by MatthiasHBusch. The source code is fully open under the MIT license. All functionality runs locally with no external dependencies beyond standard Python packages (matplotlib, PyQt5).

Category context

Agent frameworks, memory systems, reasoning layers, and model-native orchestration.

Source: Tencent SkillHub

Largest current source with strong distribution and engagement signals.

Package contents

Included in package

3 Docs1 Scripts

SKILL.md Primary doc
CHANGELOG.md Docs
references/api_reference.md Docs
scripts/generate_sketch.py Scripts