韦恩图把值编码为重叠闭曲线的交集面积。约翰·韦恩 1880；欧拉更早画过区域图。
工作报告、广告与作业中适合确有重叠故事的两三个集合。若四个以上集合，或面积必须按比例，换一种形式。
Parts
- 标记 — The core mark of 韦恩图 is 重叠闭曲线的交集面积.
- 尺度 — The scale must show zero (or a declared break) and units.
- 轴 — Axis titles name the variable, not a mood.
- 图例 — A legend is weaker than a direct label. Write beside the mark when you can.
- 标签 — Numbers are optional. If comparison is the job, label the ends only.
- 网格 — Keep the grid faint. Data should own the ink.
- 注释 — One annotation sentence. Date the source.
- 外框 — A thin frame. Never a 3-D box.
Variants
- 集合圆 — Variant 1 of 韦恩图. Same encoding, different layout.
- 欧拉图 — Variant 2 of 韦恩图. Same encoding, different layout.
- 重叠图 — Variant 3 of 韦恩图. Same encoding, different layout.
- 韦恩图 4 — Variant 4 of 韦恩图. Same encoding, different layout.
Labels
- 轴 — On 韦恩图, make Mark readable.
- 图例 — On 韦恩图, make Scale readable.
- 标签 — On 韦恩图, make Axis readable.
- 网格 — On 韦恩图, make Legend readable.
- 注释 — On 韦恩图, make Label readable.
韦恩图: honour 重叠闭曲线的交集面积, and switch when 四个以上集合，或面积必须按比例.