# PANL Specification v0.1 Pixel Art Notation Language defines deterministic, anti-aliased-free isometric pixel art assets. ## Canonical Endpoints - Human-readable: `/docs` - Machine-readable JSON: `/docs/panl.json` - Markdown export: `/docs/panl.md` ## Document Structure ```json { "version": "0.1", "canvas": { "width": 256, "height": 256 }, "palette": { "colors": { "name": "#RRGGBB" } }, "seed": 42, "definitions": { "name": { "type": "..." } }, "asset": { "id": "asset_id", "commands": [{ "type": "..." }] } } ``` ## Root Commands ### `Root Spec` - Signature: `{ version, canvas, palette?, seed?, definitions?, asset }` - Summary: Top-level document for a single asset render. | Field | Type | Required | Description | | --- | --- | --- | --- | | `version` | `string` | yes | Notation version tag, currently "0.1". | | `canvas` | `{ width: int, height: int }` | yes | Fixed output canvas size. | | `palette` | `{ colors: Record }` | no | Named colors referenced via @token. | | `seed` | `int` | no | Required when dither is used. | | `definitions` | `Record` | no | Reusable named command definitions. | | `asset` | `{ id: string, commands: command[] }` | yes | Asset identifier and render command list. | Notes: - Commands are rendered in array order. - Warnings do not block PNG export. ## Primitive Commands ### `iso_prism` - Signature: `iso_prism(x, y, w, h, depth, topFill, leftFill, rightFill, outline?)` - Summary: Isometric block primitive with top, left, and right faces. | Field | Type | Required | Description | | --- | --- | --- | --- | | `x` | `int` | yes | Top-face center X coordinate. | | `y` | `int` | yes | Top-face center Y coordinate. | | `w` | `int (even)` | yes | Top-face width. | | `h` | `int (even)` | yes | Top-face height. | | `depth` | `int >= 1` | yes | Prism vertical depth. | | `topFill/leftFill/rightFill` | `color` | yes | Face fill colors. | | `outline` | `color` | no | Optional outline color. | | `transform` | `transform` | no | translate / flip transforms. | | `dither` | `dither` | no | Checker overlay on top face. | ### `iso_tile` - Signature: `iso_tile(x, y, w, h, fill, outline?)` - Summary: Flat isometric diamond (top-face only). | Field | Type | Required | Description | | --- | --- | --- | --- | | `x` | `int` | yes | Diamond center X. | | `y` | `int` | yes | Diamond top Y. | | `w` | `int (even)` | yes | Diamond width. | | `h` | `int (even)` | yes | Diamond height. | | `fill` | `color` | yes | Fill color. | | `outline` | `color` | no | Optional edge color. | | `transform` | `transform` | no | translate / flip transforms. | | `dither` | `dither` | no | Checker overlay. | ### `rect` - Signature: `rect(x, y, w, h, fill? | stroke?)` - Summary: Axis-aligned rectangle primitive. | Field | Type | Required | Description | | --- | --- | --- | --- | | `x,y` | `int` | yes | Top-left corner. | | `w,h` | `int >= 1` | yes | Dimensions. | | `fill` | `color` | no | Fill color (required if stroke missing). | | `stroke` | `color` | no | Stroke color (required if fill missing). | | `strokeWidth` | `int >= 1` | no | Stroke width. | | `transform` | `transform` | no | translate / flip transforms. | ### `line` - Signature: `line(x1, y1, x2, y2, color, width?)` - Summary: Integer-based raster line primitive. | Field | Type | Required | Description | | --- | --- | --- | --- | | `x1,y1,x2,y2` | `int` | yes | Line endpoints. | | `color` | `color` | yes | Line color. | | `width` | `int >= 1` | no | Line width. | | `transform` | `transform` | no | translate / flip transforms. | ### `polygon` - Signature: `polygon(points, fill? | stroke?)` - Summary: Custom polygon primitive with integer points. | Field | Type | Required | Description | | --- | --- | --- | --- | | `points` | `Array<{x:int,y:int}>` | yes | At least 3 points. | | `fill` | `color` | no | Fill color (required if stroke missing). | | `stroke` | `color` | no | Stroke color (required if fill missing). | | `strokeWidth` | `int >= 1` | no | Stroke width. | | `transform` | `transform` | no | translate / flip transforms. | ### `use` - Signature: `use(ref, transform?, overrides?)` - Summary: Reference a named definition and apply allowed overrides. | Field | Type | Required | Description | | --- | --- | --- | --- | | `ref` | `string` | yes | Definition name to reuse. | | `transform` | `transform` | no | Per-instance transform. | | `overrides.colors` | `Record` | no | Allowed color key overrides only. | | `overrides.transform` | `transform` | no | Additional transform override. | Notes: - Geometry overrides are blocked in v1 by parser rules. ## Helper Commands ### `color` - Signature: `hex | @paletteToken` - Summary: Color input accepted by draw commands. | Field | Type | Required | Description | | --- | --- | --- | --- | | `hex` | `#RRGGBB \| #RRGGBBAA` | yes | Direct color literal. | | `@name` | `palette reference` | no | Lookup in palette.colors. | ### `transform` - Signature: `{ translateX?, translateY?, flipX?, flipY? }` - Summary: Integer transform properties applied in local coordinates. | Field | Type | Required | Description | | --- | --- | --- | --- | | `translateX` | `int` | no | Horizontal translation. | | `translateY` | `int` | no | Vertical translation. | | `flipX` | `boolean` | no | Mirror around local origin on X. | | `flipY` | `boolean` | no | Mirror around local origin on Y. | ### `dither` - Signature: `{ pattern: "checker", color, offsetX?, offsetY? }` - Summary: Optional checker overlay for selected primitives. | Field | Type | Required | Description | | --- | --- | --- | --- | | `pattern` | `"checker"` | yes | Current v1 supported pattern. | | `color` | `color` | yes | Overlay color. | | `offsetX/offsetY` | `int` | no | Pattern phase offsets. | ## JSON Schema ```json { "$schema": "http://json-schema.org/draft-07/schema#", "$id": "https://pane.dev/schemas/panl-0.1.schema.json", "title": "PANL Asset Spec", "description": "Pixel Art Notation Language (PANL) v0.1 asset document schema.", "type": "object", "properties": { "version": { "type": "string", "minLength": 1 }, "canvas": { "type": "object", "properties": { "width": { "type": "integer", "minimum": 16, "maximum": 1024 }, "height": { "type": "integer", "minimum": 16, "maximum": 1024 } }, "required": [ "width", "height" ], "additionalProperties": false }, "palette": { "type": "object", "properties": { "colors": { "type": "object", "patternProperties": { "^[A-Za-z_][A-Za-z0-9_]*$": { "type": "string", "pattern": "^#(?:[0-9A-Fa-f]{6}|[0-9A-Fa-f]{8})$" } }, "additionalProperties": false } }, "required": [ "colors" ], "nullable": true, "additionalProperties": false }, "seed": { "type": "integer", "nullable": true }, "definitions": { "type": "object", "nullable": true, "additionalProperties": { "oneOf": [ { "type": "object", "properties": { "type": { "const": "iso_tile" }, "x": { "type": "integer" }, "y": { "type": "integer" }, "w": { "type": "integer", "minimum": 2, "multipleOf": 2 }, "h": { "type": "integer", "minimum": 2, "multipleOf": 2 }, "fill": { "type": "string", "anyOf": [ { "pattern": "^#(?:[0-9A-Fa-f]{6}|[0-9A-Fa-f]{8})$" }, { "pattern": "^@[A-Za-z_][A-Za-z0-9_]*$" } ] }, "outline": { "type": "string", "anyOf": [ { "pattern": "^#(?:[0-9A-Fa-f]{6}|[0-9A-Fa-f]{8})$" }, { "pattern": "^@[A-Za-z_][A-Za-z0-9_]*$" } ] }, "transform": { "type": "object", "properties": { "translateX": { "type": "integer" }, "translateY": { "type": "integer" }, "flipX": { "type": "boolean" }, "flipY": { "type": "boolean" } }, "additionalProperties": false }, "dither": { "type": "object", "properties": { "pattern": { "type": "string", "enum": [ "checker" ] }, "color": { "type": "string", "anyOf": [ { "pattern": "^#(?:[0-9A-Fa-f]{6}|[0-9A-Fa-f]{8})$" }, { "pattern": "^@[A-Za-z_][A-Za-z0-9_]*$" } ] }, "offsetX": { "type": "integer" }, "offsetY": { "type": "integer" } }, "required": [ "pattern", "color" ], "additionalProperties": false } }, "required": [ "type", "x", "y", "w", "h", "fill" ], "additionalProperties": false }, { "type": "object", "properties": { "type": { "const": "iso_prism" }, "x": { "type": "integer" }, "y": { "type": "integer" }, "w": { "type": "integer", "minimum": 2, "multipleOf": 2 }, "h": { "type": "integer", "minimum": 2, "multipleOf": 2 }, "depth": { "type": "integer", "minimum": 1 }, "topFill": { "type": "string", "anyOf": [ { "pattern": "^#(?:[0-9A-Fa-f]{6}|[0-9A-Fa-f]{8})$" }, { "pattern": "^@[A-Za-z_][A-Za-z0-9_]*$" } ] }, "leftFill": { "type": "string", "anyOf": [ { "pattern": "^#(?:[0-9A-Fa-f]{6}|[0-9A-Fa-f]{8})$" }, { "pattern": "^@[A-Za-z_][A-Za-z0-9_]*$" } ] }, "rightFill": { "type": "string", "anyOf": [ { "pattern": "^#(?:[0-9A-Fa-f]{6}|[0-9A-Fa-f]{8})$" }, { "pattern": "^@[A-Za-z_][A-Za-z0-9_]*$" } ] }, "outline": { "type": "string", "anyOf": [ { "pattern": "^#(?:[0-9A-Fa-f]{6}|[0-9A-Fa-f]{8})$" }, { "pattern": "^@[A-Za-z_][A-Za-z0-9_]*$" } ] }, "transform": { "type": "object", "properties": { "translateX": { "type": "integer" }, "translateY": { "type": "integer" }, "flipX": { "type": "boolean" }, "flipY": { "type": "boolean" } }, "additionalProperties": false }, "dither": { "type": "object", "properties": { "pattern": { "type": "string", "enum": [ "checker" ] }, "color": { "type": "string", "anyOf": [ { "pattern": "^#(?:[0-9A-Fa-f]{6}|[0-9A-Fa-f]{8})$" }, { "pattern": "^@[A-Za-z_][A-Za-z0-9_]*$" } ] }, "offsetX": { "type": "integer" }, "offsetY": { "type": "integer" } }, "required": [ "pattern", "color" ], "additionalProperties": false } }, "required": [ "type", "x", "y", "w", "h", "depth", "topFill", "leftFill", "rightFill" ], "additionalProperties": false }, { "type": "object", "properties": { "type": { "const": "rect" }, "x": { "type": "integer" }, "y": { "type": "integer" }, "w": { "type": "integer", "minimum": 1 }, "h": { "type": "integer", "minimum": 1 }, "fill": { "type": "string", "anyOf": [ { "pattern": "^#(?:[0-9A-Fa-f]{6}|[0-9A-Fa-f]{8})$" }, { "pattern": "^@[A-Za-z_][A-Za-z0-9_]*$" } ] }, "stroke": { "type": "string", "anyOf": [ { "pattern": 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"type": "integer" }, "x2": { "type": "integer" }, "y2": { "type": "integer" }, "color": { "type": "string", "anyOf": [ { "pattern": "^#(?:[0-9A-Fa-f]{6}|[0-9A-Fa-f]{8})$" }, { "pattern": "^@[A-Za-z_][A-Za-z0-9_]*$" } ] }, "width": { "type": "integer", "minimum": 1 }, "transform": { "type": "object", "properties": { "translateX": { "type": "integer" }, "translateY": { "type": "integer" }, "flipX": { "type": "boolean" }, "flipY": { "type": "boolean" } }, "additionalProperties": false }, "dither": { "type": "object", "properties": { "pattern": { "type": "string", "enum": [ "checker" ] }, "color": { "type": "string", "anyOf": [ { "pattern": "^#(?:[0-9A-Fa-f]{6}|[0-9A-Fa-f]{8})$" }, { "pattern": "^@[A-Za-z_][A-Za-z0-9_]*$" } ] }, "offsetX": { "type": "integer" }, "offsetY": { "type": "integer" } }, "required": [ "pattern", "color" ], "additionalProperties": false } }, "required": [ "type", "x1", "y1", "x2", "y2", "color" ], "additionalProperties": false }, { "type": "object", "properties": 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"transform": { "type": "object", "properties": { "translateX": { "type": "integer" }, "translateY": { "type": "integer" }, "flipX": { "type": "boolean" }, "flipY": { "type": "boolean" } }, "additionalProperties": false }, "dither": { "type": "object", "properties": { "pattern": { "type": "string", "enum": [ "checker" ] }, "color": { "type": "string", "anyOf": [ { "pattern": "^#(?:[0-9A-Fa-f]{6}|[0-9A-Fa-f]{8})$" }, { "pattern": "^@[A-Za-z_][A-Za-z0-9_]*$" } ] }, "offsetX": { "type": "integer" }, "offsetY": { "type": "integer" } }, "required": [ "pattern", "color" ], "additionalProperties": false } }, "required": [ "type", "x", "y", "w", "h", "fill" ], "additionalProperties": false }, { "type": "object", "properties": { "type": { "const": "iso_prism" }, "x": { "type": "integer" }, "y": { "type": "integer" }, "w": { "type": "integer", "minimum": 2, "multipleOf": 2 }, "h": { "type": "integer", "minimum": 2, "multipleOf": 2 }, "depth": { "type": "integer", "minimum": 1 }, "topFill": { 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"stroke" ] } ], "additionalProperties": false }, { "type": "object", "properties": { "type": { "const": "use" }, "ref": { "type": "string", "minLength": 1 }, "transform": { "type": "object", "properties": { "translateX": { "type": "integer" }, "translateY": { "type": "integer" }, "flipX": { "type": "boolean" }, "flipY": { "type": "boolean" } }, "additionalProperties": false }, "overrides": { "type": "object", "properties": { "colors": { "type": "object", "patternProperties": { "^[A-Za-z_][A-Za-z0-9_]*$": { "type": "string", "anyOf": [ { "pattern": "^#(?:[0-9A-Fa-f]{6}|[0-9A-Fa-f]{8})$" }, { "pattern": "^@[A-Za-z_][A-Za-z0-9_]*$" } ] } }, "additionalProperties": false }, "transform": { "type": "object", "properties": { "translateX": { "type": "integer" }, "translateY": { "type": "integer" }, "flipX": { "type": "boolean" }, "flipY": { "type": "boolean" } }, "additionalProperties": false } }, "additionalProperties": false } }, "required": [ "type", "ref" ], "additionalProperties": false } ] } } }, "required": [ "id", "commands" ], "additionalProperties": false } }, "required": [ "version", "canvas", "asset" ], "additionalProperties": false } ```