饼图与环形图把值编码为扇形的角度与面积。普莱费尔 1801；南丁格尔鸡冠图 1858 是极坐标近亲。
工作报告、广告与作业中适合构成有意义整体的两到五个部分。若很多相近切片、3D 饼或两张饼互比，换一种形式。
Parts
- 标记 — The core mark of 饼图与环形图 is 扇形的角度与面积.
- 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
- 饼图 — Variant 1 of 饼图与环形图. Same encoding, different layout.
- 环形图 — Variant 2 of 饼图与环形图. Same encoding, different layout.
- 部分与整体 — Variant 3 of 饼图与环形图. Same encoding, different layout.
- 饼图与环形图 4 — Variant 4 of 饼图与环形图. Same encoding, different layout.
Labels
- 轴 — On 饼图与环形图, make Mark readable.
- 图例 — On 饼图与环形图, make Scale readable.
- 标签 — On 饼图与环形图, make Axis readable.
- 网格 — On 饼图与环形图, make Legend readable.
- 注释 — On 饼图与环形图, make Label readable.
饼图与环形图: honour 扇形的角度与面积, and switch when 很多相近切片、3D 饼或两张饼互比.