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reticle-designer

Design rifle-scope reticles and emit BallisticCalculator .reticle files with SVG previews.

43|30|Updated Nov 16, 2025
Search Tags:#svg#scope#xml#generate#ballistics#reticle#holdover
One-click install
npx skills add https://github.com/nikolaygekht/ballistic.calculator.app.avalonia --skill reticle-designer-nikolaygekht
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: reticle-designer
Source: https://github.com/nikolaygekht/ballistic.calculator.app.avalonia/tree/main/.claude/skills/reticle-designer
Command: npx skills add https://github.com/nikolaygekht/ballistic.calculator.app.avalonia --skill reticle-designer-nikolaygekht

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes scripts (resource) and references (resource) and assets (resource) components.

What problem does it solve? Designing a rifle-scope reticle means translating a plain-language brief into precise angular geometry, and the BallisticCalculator .reticle (BXml) format fails silently on misspelled attributes, mis-cased booleans, and wrong colour attribute names, so hand-written files produce wrong drawings with no error. This Skill encodes the complete file specification, reticle design principles, and verified patterns, and ships a check/render tool that catches what the deserializer would silently drop. ## Core Features & Use Cases - Reticle generation from a brief: Convert descriptions like "0.2 mil hashes out to 5 mils" into complete .reticle files covering duplex, mil-dot, hash-ladder, christmas-tree, chevron, circle-dot, dense-grid, and rangefinding-stadia families. - Commercial reticle reproduction: Reproduce named reticles (Horus H58/H59, TReMoR, Mil-C, MOAR) from manufacturer technical data sheets, with correct mrad-vs-mil unit handling and radius-vs-diameter conversion. - Validation and preview: Run scripts/reticle.py check to detect silently-dropped attributes and BDC label collisions, and render to SVG plus an ASCII raster to verify symmetry, stroke-weight hierarchy, and clutter. - Use Case: A user asks for a christmas-tree holdover reticle for a .308 load; the Skill computes drop and windage holds from a trajectory, generates the ladder with a Python emitter, validates the file, and delivers the .reticle, an SVG preview, and a subtension table. ## Quick Start Ask the assistant to design a scope reticle from your description, for example: create a mil-hash reticle with 0.2 mrad graduations out to 10 mrad of holdover and render a preview.

Frequently Asked Questions about reticle-designer

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I create a custom rifle scope reticle file?▼

Describe the reticle in plain language — unit system, hash spacing, holdover extent, and aiming point — and the Skill generates a .reticle BXml file, validates it with scripts/reticle.py check, and renders an SVG plus ASCII preview for review.

What is the difference between mil and mrad in a .reticle file?▼

In this library, mil means the NATO military mil (1/6400 circle), which is 1.86% smaller than a milliradian. Shooters saying "mil" almost always mean milliradian, so write mrad; over a 10-mil ladder the error is about 0.19 mrad.

Why does my .reticle file load but draw incorrectly?▼

The BXml deserializer validates nothing: misspelled attributes are skipped, fill="True" silently reads as false, and each element uses a different colour attribute name (line-color, color, text-color). Run scripts/reticle.py check to find every silent failure.

Can I reproduce a commercial reticle like the Horus H59?▼

Yes. The Skill covers reproducing named reticles from manufacturer technical data sheets, which carry exact line widths and dot diameters as dimensioned drawings. Remember spec sheets quote dot diameters while reticle-circle takes a radius, so halve those values.

How do BDC anchors work in a reticle file?▼

A <bdc> element draws nothing; it is an invisible anchor that ReticleDrawController labels with distances computed from a real trajectory at render time. The visible tick at each hold must be a separate reticle-line, and the trajectory step should be 25 yards or finer.

Why do my holdover marks appear above the crosshair?▼

Reticle Y is positive upward, so holdover marks below the aiming point need negative Y values — the opposite of screen coordinates. Windage also has the opposite sign to reticle X, so drift-compensated holds use x = -WindageAdjustment.

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