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json-canvas

json-canvas

github.com/oldwinter生产力1036 次安装1 周前更新
代码仓库

关于 json-canvas

json-canvas 是供兼容技能的 Agent 创建和编辑有效 JSON Canvas `.canvas` 文件的技能,涵盖 Spec 1.0 的结构、节点与边类型及校验规则。

主要功能

  1. 01创建和编辑 `.canvas` 文件
  2. 02支持文本、文件、链接和分组节点
  3. 03设置边及端点样式
  4. 04使用颜色和背景样式
  5. 05校验必填字段与引用

适用场景

  1. 01制作 Obsidian 画布
  2. 02以可视方式整理笔记、文件和链接
  3. 03构建关联图表或项目板

安装

复制下面的命令,在终端中运行。

$npx skills add https://github.com/oldwinter/skills --skill json-canvas

安装后在 Claude Code 中输入/json-canvas确认已加载。

详细介绍

JSON Canvas 技能

此技能支持兼容技能的 Agent 创建和编辑有效的 JSON Canvas 文件(.canvas),供 Obsidian 和其他应用程序使用。

概述

JSON Canvas 是一种用于无限画布数据的开放文件格式。画布文件使用 .canvas 扩展名,并包含符合 JSON Canvas Spec 1.0 的有效 JSON。

文件结构

画布文件包含两个顶层数组:

{
  "nodes": [],
  "edges": []
}
  • nodes(可选):节点对象数组
  • edges(可选):连接节点的边对象数组

节点

节点是放置在画布上的对象。共有四种节点类型:

  • text - Markdown 文本内容
  • file - 文件或附件引用
  • link - 外部 URL
  • group - 其他节点的可视化容器
Z 轴顺序

数组中的节点按 Z 轴顺序排列:

  • 第一个节点 = 最底层(显示在其他节点下方)
  • 最后一个节点 = 最顶层(显示在其他节点上方)
通用节点属性

所有节点共享以下属性:

属性必填类型说明
id是string节点的唯一标识符
type是string节点类型:text、file、link 或 group
x是integerX 坐标位置(像素)
y是integerY 坐标位置(像素)
width是integer宽度(像素)
height是integer高度(像素)
color否canvasColor节点颜色(参见“颜色”部分)
文本节点

文本节点包含 Markdown 内容。

{
  "id": "6f0ad84f44ce9c17",
  "type": "text",
  "x": 0,
  "y": 0,
  "width": 400,
  "height": 200,
  "text": "# Hello World\n\nThis is **Markdown** content."
}
属性必填类型说明
text是string带 Markdown 语法的纯文本
文件节点

文件节点引用文件或附件(图片、视频、PDF、笔记等)。

{
  "id": "a1b2c3d4e5f67890",
  "type": "file",
  "x": 500,
  "y": 0,
  "width": 400,
  "height": 300,
  "file": "Attachments/diagram.png"
}
{
  "id": "b2c3d4e5f6789012",
  "type": "file",
  "x": 500,
  "y": 400,
  "width": 400,
  "height": 300,
  "file": "Notes/Project Overview.md",
  "subpath": "#Implementation"
}
属性必填类型说明
file是string系统中的文件路径
subpath否string指向标题或区块的链接(以 # 开头)
链接节点

链接节点用于显示外部 URL。

{
  "id": "c3d4e5f678901234",
  "type": "link",
  "x": 1000,
  "y": 0,
  "width": 400,
  "height": 200,
  "url": "https://obsidian.md"
}
属性必填类型说明
url是string外部 URL
分组节点

分组节点是用于整理其他节点的可视化容器。

{
  "id": "d4e5f6789012345a",
  "type": "group",
  "x": -50,
  "y": -50,
  "width": 1000,
  "height": 600,
  "label": "Project Overview",
  "color": "4"
}
{
  "id": "e5f67890123456ab",
  "type": "group",
  "x": 0,
  "y": 700,
  "width": 800,
  "height": 500,
  "label": "Resources",
  "background": "Attachments/background.png",
  "backgroundStyle": "cover"
}
属性必填类型说明
label否string分组的文本标签
background否string背景图片路径
backgroundStyle否string背景渲染样式
背景样式
值说明
cover填满节点的整个宽度和高度
ratio保持背景图片的宽高比
repeat在两个方向上重复图片作为图案

边

边是连接节点的线条。

{
  "id": "f67890123456789a",
  "fromNode": "6f0ad84f44ce9c17",
  "toNode": "a1b2c3d4e5f67890"
}
{
  "id": "0123456789abcdef",
  "fromNode": "6f0ad84f44ce9c17",
  "fromSide": "right",
  "fromEnd": "none",
  "toNode": "b2c3d4e5f6789012",
  "toSide": "left",
  "toEnd": "arrow",
  "color": "1",
  "label": "leads to"
}
属性必填类型默认值说明
id是string-边的唯一标识符
fromNode是string-连接起点所在的节点 ID
fromSide否string-边的起始侧
fromEnd否stringnone边起点的形状
toNode是string-连接终点所在的节点 ID
toSide否string-边的结束侧
toEnd否stringarrow边终点的形状
color否canvasColor-线条颜色
label否string-边的文本标签
边的侧值
值说明
top节点顶部边缘
right节点右侧边缘
bottom节点底部边缘
left节点左侧边缘
端点形状
值说明
none无端点形状
arrow箭头端点

颜色

canvasColor 类型可以通过以下两种方式指定:

十六进制颜色
{
  "color": "#FF0000"
}
预设颜色
{
  "color": "1"
}
预设颜色
"1"红色
"2"橙色
"3"黄色
"4"绿色
"5"青色
"6"紫色

注意:各预设的具体颜色值有意未定义,以便应用使用自己的品牌色。

完整示例

带文本和连线的简单画布
{
  "nodes": [
    {
      "id": "8a9b0c1d2e3f4a5b",
      "type": "text",
      "x": 0,
      "y": 0,
      "width": 300,
      "height": 150,
      "text": "# Main Idea\n\nThis is the central concept."
    },
    {
      "id": "1a2b3c4d5e6f7a8b",
      "type": "text",
      "x": 400,
      "y": -100,
      "width": 250,
      "height": 100,
      "text": "## Supporting Point A\n\nDetails here."
    },
    {
      "id": "2b3c4d5e6f7a8b9c",
      "type": "text",
      "x": 400,
      "y": 100,
      "width": 250,
      "height": 100,
      "text": "## Supporting Point B\n\nMore details."
    }
  ],
  "edges": [
    {
      "id": "3c4d5e6f7a8b9c0d",
      "fromNode": "8a9b0c1d2e3f4a5b",
      "fromSide": "right",
      "toNode": "1a2b3c4d5e6f7a8b",
      "toSide": "left"
    },
    {
      "id": "4d5e6f7a8b9c0d1e",
      "fromNode": "8a9b0c1d2e3f4a5b",
      "fromSide": "right",
      "toNode": "2b3c4d5e6f7a8b9c",
      "toSide": "left"
    }
  ]
}
带分组的项目看板
{
  "nodes": [
    {
      "id": "5e6f7a8b9c0d1e2f",
      "type": "group",
      "x": 0,
      "y": 0,
      "width": 300,
      "height": 500,
      "label": "To Do",
      "color": "1"
    },
    {
      "id": "6f7a8b9c0d1e2f3a",
      "type": "group",
      "x": 350,
      "y": 0,
      "width": 300,
      "height": 500,
      "label": "In Progress",
      "color": "3"
    },
    {
      "id": "7a8b9c0d1e2f3a4b",
      "type": "group",
      "x": 700,
      "y": 0,
      "width": 300,
      "height": 500,
      "label": "Done",
      "color": "4"
    },
    {
      "id": "8b9c0d1e2f3a4b5c",
      "type": "text",
      "x": 20,
      "y": 50,
      "width": 260,
      "height": 80,
      "text": "## Task 1\n\nImplement feature X"
    },
    {
      "id": "9c0d1e2f3a4b5c6d",
      "type": "text",
      "x": 370,
      "y": 50,
      "width": 260,
      "height": 80,
      "text": "## Task 2\n\nReview PR #123",
      "color": "2"
    },
    {
      "id": "0d1e2f3a4b5c6d7e",
      "type": "text",
      "x": 720,
      "y": 50,
      "width": 260,
      "height": 80,
      "text": "## Task 3\n\n~~Setup CI/CD~~"
    }
  ],
  "edges": []
}
带文件和链接的研究画布
{
  "nodes": [
    {
      "id": "1e2f3a4b5c6d7e8f",
      "type": "text",
      "x": 300,
      "y": 200,
      "width": 400,
      "height": 200,
      "text": "# Research Topic\n\n## Key Questions\n\n- How does X affect Y?\n- What are the implications?",
      "color": "5"
    },
    {
      "id": "2f3a4b5c6d7e8f9a",
      "type": "file",
      "x": 0,
      "y": 0,
      "width": 250,
      "height": 150,
      "file": "Literature/Paper A.pdf"
    },
    {
      "id": "3a4b5c6d7e8f9a0b",
      "type": "file",
      "x": 0,
      "y": 200,
      "width": 250,
      "height": 150,
      "file": "Notes/Meeting Notes.md",
      "subpath": "#Key Insights"
    },
    {
      "id": "4b5c6d7e8f9a0b1c",
      "type": "link",
      "x": 0,
      "y": 400,
      "width": 250,
      "height": 100,
      "url": "https://example.com/research"
    },
    {
      "id": "5c6d7e8f9a0b1c2d",
      "type": "file",
      "x": 750,
      "y": 150,
      "width": 300,
      "height": 250,
      "file": "Attachments/diagram.png"
    }
  ],
  "edges": [
    {
      "id": "6d7e8f9a0b1c2d3e",
      "fromNode": "2f3a4b5c6d7e8f9a",
      "fromSide": "right",
      "toNode": "1e2f3a4b5c6d7e8f",
      "toSide": "left",
      "label": "supports"
    },
    {
      "id": "7e8f9a0b1c2d3e4f",
      "fromNode": "3a4b5c6d7e8f9a0b",
      "fromSide": "right",
      "toNode": "1e2f3a4b5c6d7e8f",
      "toSide": "left",
      "label": "informs"
    },
    {
      "id": "8f9a0b1c2d3e4f5a",
      "fromNode": "4b5c6d7e8f9a0b1c",
      "fromSide": "right",
      "toNode": "1e2f3a4b5c6d7e8f",
      "toSide": "left",
      "toEnd": "arrow",
      "color": "6"
    },
    {
      "id": "9a0b1c2d3e4f5a6b",
      "fromNode": "1e2f3a4b5c6d7e8f",
      "fromSide": "right",
      "toNode": "5c6d7e8f9a0b1c2d",
      "toSide": "left",
      "label": "visualized by"
    }
  ]
}
流程图
{
  "nodes": [
    {
      "id": "a0b1c2d3e4f5a6b7",
      "type": "text",
      "x": 200,
      "y": 0,
      "width": 150,
      "height": 60,
      "text": "**Start**",
      "color": "4"
    },
    {
      "id": "b1c2d3e4f5a6b7c8",
      "type": "text",
      "x": 200,
      "y": 100,
      "width": 150,
      "height": 60,
      "text": "Step 1:\nGather data"
    },
    {
      "id": "c2d3e4f5a6b7c8d9",
      "type": "text",
      "x": 200,
      "y": 200,
      "width": 150,
      "height": 80,
      "text": "**Decision**\n\nIs data valid?",
      "color": "3"
    },
    {
      "id": "d3e4f5a6b7c8d9e0",
      "type": "text",
      "x": 400,
      "y": 200,
      "width": 150,
      "height": 60,
      "text": "Process data"
    },
    {
      "id": "e4f5a6b7c8d9e0f1",
      "type": "text",
      "x": 0,
      "y": 200,
      "width": 150,
      "height": 60,
      "text": "Request new data",
      "color": "1"
    },
    {
      "id": "f5a6b7c8d9e0f1a2",
      "type": "text",
      "x": 400,
      "y": 320,
      "width": 150,
      "height": 60,
      "text": "**End**",
      "color": "4"
    }
  ],
  "edges": [
    {
      "id": "a6b7c8d9e0f1a2b3",
      "fromNode": "a0b1c2d3e4f5a6b7",
      "fromSide": "bottom",
      "toNode": "b1c2d3e4f5a6b7c8",
      "toSide": "top"
    },
    {
      "id": "b7c8d9e0f1a2b3c4",
      "fromNode": "b1c2d3e4f5a6b7c8",
      "fromSide": "bottom",
      "toNode": "c2d3e4f5a6b7c8d9",
      "toSide": "top"
    },
    {
      "id": "c8d9e0f1a2b3c4d5",
      "fromNode": "c2d3e4f5a6b7c8d9",
      "fromSide": "right",
      "toNode": "d3e4f5a6b7c8d9e0",
      "toSide": "left",
      "label": "Yes",
      "color": "4"
    },
    {
      "id": "d9e0f1a2b3c4d5e6",
      "fromNode": "c2d3e4f5a6b7c8d9",
      "fromSide": "left",
      "toNode": "e4f5a6b7c8d9e0f1",
      "toSide": "right",
      "label": "No",
      "color": "1"
    },
    {
      "id": "e0f1a2b3c4d5e6f7",
      "fromNode": "e4f5a6b7c8d9e0f1",
      "fromSide": "top",
      "fromEnd": "none",
      "toNode": "b1c2d3e4f5a6b7c8",
      "toSide": "left",
      "toEnd": "arrow"
    },
    {
      "id": "f1a2b3c4d5e6f7a8",
      "fromNode": "d3e4f5a6b7c8d9e0",
      "fromSide": "bottom",
      "toNode": "f5a6b7c8d9e0f1a2",
      "toSide": "top"
    }
  ]
}

ID 生成

节点和连线 ID 必须是唯一字符串。Obsidian 会生成 16 个字符的十六进制 ID:

"id": "6f0ad84f44ce9c17"
"id": "a3b2c1d0e9f8g7h6"
"id": "1234567890abcdef"

此格式为 16 个字符的小写十六进制字符串(64 位随机值)。

布局指南

定位
  • 坐标可以为负(画布无限延伸)
  • x 向右递增
  • y 向下递增
  • 位置指节点的左上角
推荐尺寸
节点类型建议宽度建议高度
小段文本200-30080-150
中段文本300-450150-300
大段文本400-600300-500
文件预览300-500200-400
链接预览250-400100-200
分组不定不定
间距
  • 在分组内留出 20-50px 的内边距
  • 节点之间间隔 50-100px 以提升可读性
  • 将节点对齐到网格(10 或 20 的倍数)以获得更整洁的布局

校验规则

  1. 所有 id 值在节点和连线之间必须唯一
  2. fromNode 和 toNode 必须引用已存在的节点 ID
  3. 每种节点类型都必须包含必填字段
  4. type 必须是以下之一:text、file、link、group
  5. backgroundStyle 必须是以下之一:cover、ratio、repeat
  6. fromSide、toSide 必须是以下之一:top、right、bottom、left
  7. fromEnd、toEnd 必须是以下之一:none、arrow
  8. 颜色预设必须是 "1" 到 "6" 或有效的十六进制颜色

参考资料

评论

支持 Markdown